CN211230580U

CN211230580U - Spark extinguishing silencer with resonant cavity

Info

Publication number: CN211230580U
Application number: CN201921622887.2U
Authority: CN
Inventors: 梅冬生; 季振林; 肖友洪; 严桂芳
Original assignee: Jiangsu Yean Industry Environmental Protection Equipment Technology Co ltd
Current assignee: Jiangsu Yean Industry Environmental Protection Equipment Technology Co ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-08-11
Anticipated expiration: 2029-09-27

Abstract

The utility model discloses a spark extinguishing silencer with a resonant cavity, wherein, both ends of an outer cylinder body are respectively and fixedly connected with an air inlet cover and a rear end cover, an air inlet pipe is arranged on the air inlet cover in a penetrating way, an air outlet pipe is arranged on the outer cylinder body, the extending end of the air inlet pipe is connected with a cyclone cylinder, and the cyclone cylinder comprises a plurality of cyclone blades which are arranged at intervals along the circumferential direction; a middle-layer sleeve is supported in the cylinder of the outer cylinder body through a partition plate, an inner cylinder body is fixedly arranged in the cylinder of the middle-layer sleeve, a core part of the inner cylinder body is filled with sound absorption materials, and a cylinder plate of the cylinder body is a perforated plate; partition plate guard plates are arranged on two sides of each partition plate and are perforated plates; the outer cylinder is internally provided with a resonance clapboard along the radial direction, the resonance clapboard is provided with a resonance throat, a resonance cavity is formed between the resonance clapboard and the rear end cover, and the central line of the air outlet pipe is crossed with the central line of the outer cylinder. The spark extinguishing silencer can not only quickly extinguish sparks, but also realize broadband noise elimination.

Description

Spark extinguishing silencer with resonant cavity

Technical Field

The utility model relates to a silencer for diesel engine especially relates to a silencer for reducing naval vessel diesel engine exhaust pipe mouth radiation noise.

Background

Exhaust noise of diesel engines is a major source of noise. The diesel engine for modern ships has high power, high temperature of exhausted smoke, high flow rate and flow rate, and the frequency range of exhaust noise is 50 Hz-4000 Hz, so the silencer mounted on the diesel engine is required to meet the technical indexes of large main frequency noise elimination, low airflow resistance, small structural size, light weight and the like. Besides good broadband silencing performance, smooth exhaust and small pressure loss must be ensured. At present, the exhaust silencer of the marine internal combustion engine is an expansion silencer mainly used for eliminating medium and low frequency noise, and the exhaust silencer is often narrow in silencing frequency band, difficult to cover a noise frequency band with high sound wave, or easy to form large flow resistance and exhaust back pressure in an exhaust pipeline, and large in power loss of the internal combustion engine.

The diesel engine has high power and large diesel consumption, the diesel generates carbon particles when being insufficiently combusted in a combustion chamber, the carbon particles are accumulated in an exhaust pipe of the diesel engine and form sparks to be taken out when being combusted by high-temperature gas, so that the surrounding environment is polluted, and when the diesel is combusted and inflammable, the carbon particles are easy to cause fire alarm during combustion and even cause surrounding combustible gas explosion to cause disastrous accidents.

The prior art utilizes a silencer to weaken exhaust noise, and the silencing effect depends on the internal structure and volume of the silencer and the matching property of an engine. When the low-frequency noise is to be attenuated, a resonant cavity is designed in the silencer, so that the volume and the occupied space of the silencer are increased, the requirement of the noise attenuation amount cannot be met due to the limitation of practical engineering, and the external radiation noise of the whole silencer is larger.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a spark extinguishing silencer with a resonant cavity is provided, which can not only realize broadband noise elimination, has small exhaust resistance and can quickly extinguish sparks.

In order to solve the technical problem, the spark extinguishing silencer with the resonant cavity comprises an outer barrel body, wherein an air inlet end cover and a rear end cover are fixedly connected to two ends of the outer barrel body respectively, an air inlet pipe is arranged on the air inlet end cover in a penetrating mode, an air outlet pipe is arranged on the outer barrel body, the barrel wall of the outer barrel body is of a double-layer structure, sound absorbing materials are filled in the barrel wall, and an inner barrel plate of the barrel wall of the outer barrel body is a perforated plate; the air inlet end cover is also of a double-layer structure, sound absorption materials are filled in the air inlet end cover, and an inner wall plate of the air inlet end cover is a perforated plate; the extending end of the air inlet pipe is connected with a cyclone cylinder, the cyclone cylinder comprises a plurality of cyclone blades which are arranged at intervals along the circumferential direction, and a cyclone cylinder end plate is fixed on the cyclone cylinder; a middle-layer sleeve is supported in the cylinder of the outer cylinder body through a partition plate, the middle-layer sleeve adopts a double-layer structure, sound absorption materials are filled in the middle-layer sleeve, and an inner cylinder plate of the middle-layer sleeve is a perforated plate; an inner cylinder body is fixedly arranged in the cylinder of the middle-layer sleeve, a core part of the inner cylinder body is filled with sound absorption materials, and a cylinder plate of the cylinder body is a perforated plate; partition plate guard plates are arranged on two sides of the partition plate, the partition plate guard plates are perforated plates, and sound absorption materials are filled between the partition plate and the partition plate guard plates; the outer cylinder is internally provided with a resonance clapboard along the radial direction, the resonance clapboard is provided with a resonance throat, a resonance cavity is formed between the resonance clapboard and the rear end cover, and the central line of the air outlet pipe is crossed with the central line of the outer cylinder.

Further, the swirl vanes are arranged along the circumferential tangent of the swirl cylinder body, and an air inlet channel is formed at the interval between two adjacent swirl plates.

Furthermore, both ends of the inner cylinder body are respectively provided with an air inlet guide cone and an air outlet guide cone, and the inner cylinder body is fixedly arranged in the middle-layer sleeve through a support rod.

Furthermore, the perforation rates of the inner cylinder plate of the outer cylinder, the inner cylinder plate of the inner cylinder and the inner cylinder plate of the middle-layer sleeve are all 25-30%, and the perforation aperture is 4-8 mm.

Further, the baffle is located the middle part position of middle level sleeve length direction.

Furthermore, the central line of the air inlet pipe and the central line of the outer cylinder are on the same straight line, and the central line of the air outlet pipe is perpendicular to the central line of the outer cylinder.

Furthermore, the sound absorption material is rock wool or glass fiber, and glass fiber cloth is lined between the glass fiber and the perforated plate.

Furthermore, the outer cylinder body is provided with a dust collecting port which leads to a dust collecting hopper from the interior of the outer cylinder body; the position of the ash collecting hopper corresponds to the position of the cyclone cylinder.

After the structure is adopted, the outer cylinder body and the air inlet end cover both adopt a double-layer structure, the double-layer wall cavity is filled with sound absorption materials, the wall plates facing the flow cavity are all provided with hole plates, the core parts of the middle-layer sleeve and the inner cylinder body are also filled with the sound absorption materials, the cylinder plates of the cylinder body are provided with the hole plates, and the hole plates and the sound absorption materials form a resistive silencer. The middle sleeve is supported in the cylinder of the outer cylinder through the partition plate, the inner wall of the outer cylinder of the silencer, the partition plate and the outer wall of the middle sleeve form an annular side-branch resonant cavity, part of sound energy is reflected back by the structure, and part of sound energy is transmitted into the resonant cavity to consume energy, and particularly when the optimized structure size enables the resonant frequency to be close to or equal to the sound frequency, resonance is generated, and the side-branch resonant cavity absorbs and consumes a large amount of sound energy. The cyclone cylinder is connected to the extending end of the air inlet pipe, the cyclone cylinder end plate is fixed at the cylinder end of the cyclone cylinder, the spark carbon particles mixed in the air flow are forced to throw off towards the inner wall of the outer cylinder body along the tangential direction of the cyclone cylinder under the action of the cyclone blades of the cyclone cylinder by the air flow guided in through the air inlet pipe, so that the spark is collided with the cylinder wall and quickly extinguished, the extinguished spark carbon particles slide to the fire collecting port along the cylinder wall and finally enter the ash collecting hopper, and the extinguishing of the spark and the cooling and collection of the carbon particles are realized in the silencing process of the air flow, so that the silencer stuffing caused by the spark carbon particles is avoided, the stability of the silencing performance is ensured, and the explosion hidden danger caused by tail gas with the spark is effectively avoided. And the resonant cavity is formed between the resonant clapboard and the rear end cover, so that the novel vibration damping device has the characteristics of strong frequency selectivity, large low-frequency noise damping capacity and small air flow resistance, and is simple in structure and easy to manufacture. The utility model adopts the impedance composite noise elimination method, and realizes broadband high-efficiency noise elimination by utilizing the reasonable matching of expansion, resonance and loop sound absorption; the design of low flow resistance is realized by adopting cone diversion and a straight-through air passage; the spark extinguishing function is realized by adopting the cyclone cylinder and the cyclone blades, and the spark extinguishing silencer is formed.

Drawings

The spark extinguishing muffler with a resonant cavity according to the present invention will be further described with reference to the accompanying drawings and the following detailed description.

FIG. 1 is a schematic cross-sectional view of one embodiment of a spark quenching muffler having a resonant cavity of the present invention;

FIG. 2 is a left side view of the structure shown in FIG. 1;

FIG. 3 is a schematic view of a cross-section A-A of the structure shown in FIG. 1;

in the figure, 1-air inlet pipe, 2-air inlet end cover, 3-outer cylinder, 4-cyclone cylinder, 5-cyclone cylinder end plate, 6-middle sleeve, 7-inner cylinder, 8-partition plate, 9-partition plate guard plate, 10-support rod, 11-resonance partition plate, 12-resonance throat, 13-resonance cavity, 14-rear end cover, 15-air outlet pipe, 16-air outlet guide cone, 17-air inlet guide cone, 18-dust collecting port, 19-dust collecting hopper, 20-mounting bracket and 21-cyclone blade.

Detailed Description

As shown in fig. 1 and 2, the outer cylinder 3 of the silencer is a circular tube structure, the outer cylinder 3 is a double-layer structure, the sound absorbing material is filled in the double-layer wall of the cylinder wall, the inner cylinder wall of the outer cylinder 3 is a perforated plate, a plurality of perforations are uniformly distributed on the perforated plate, the perforation rate is 30%, the perforation aperture (perforation diameter) is 5mm, and a glass fiber cloth layer laid by glass fiber cloth is arranged between the sound absorbing material and the inner cylinder wall. An air inlet end cover 2 and a rear end cover 14 are respectively fixed at two ends of the outer cylinder 3, the air inlet end cover 2 and the rear end cover 14 are both in an elliptical crown sealing head structure, and the outer cylinder 3, the air inlet end cover 2 and the rear end cover 12 form a silencer shell cavity. The air inlet end cover 2 and the rear end cover 14 both adopt a double-layer structure, sound absorption materials are filled in the end covers, the inner wall plate of each end cover is a perforated plate, and a glass fiber cloth layer is also arranged between the inner wall plate and the sound absorption materials; the inner wall plate had a piercing rate of 30% and a piercing hole diameter of 5 mm.

An air inlet pipe 1 is penetratingly arranged on the air inlet end cover 2, an air outlet pipe 15 is arranged on the outer cylinder, the central line of the air inlet pipe and the central line of the outer cylinder are positioned on the same straight line, and the central line of the air outlet pipe 15 is perpendicular to the central line of the outer cylinder 3.

The inlet end of the air inlet pipe 1 extending into the outer barrel is connected with a cyclone barrel 4, and a cyclone barrel end plate 5 is fixedly arranged at the end of the cyclone barrel 4 facing the inner part of the outer barrel. As shown in fig. 3, the cyclone cylinder 4 includes a plurality of cyclone blades 21 uniformly arranged at intervals along the circumferential direction of the cyclone cylinder; when the cyclone cylinder is manufactured, the cylinder wall of the cyclone cylinder is uniformly divided into a plurality of cylinder wall blades, and then the sheet cylinder wall blades are twisted for a certain angle to form the cyclone blades 21, so that each cyclone blade 21 is arranged along the circumferential tangent of the cyclone cylinder, and an air inlet channel is formed at the interval between two adjacent cyclone blades 21. The air flow entering from the air inlet pipe 1 is blocked by the cyclone cylinder end plate 5 and is forced to enter the cylinder cavity of the outer cylinder 3 from the air inlet channel between the cyclone blades 21, and the cyclone blades 21 are arranged along the tangential direction of the cylinder, so that a rotating air flow is formed, and the sparks and carbon particles mixed in the rotating air flow are thrown to the inner cylinder wall of the outer cylinder.

As shown in fig. 1, an ash collecting port 18 is arranged on the outer cylinder 3 corresponding to the position of the cyclone cylinder 4, and an ash collecting hopper 19 is arranged outside the ash collecting port 18; the thrown carbon particles slide along the inner wall of the outer cylinder 3 from the dust collecting port 18 to the dust collecting hopper 19.

A middle-layer sleeve 6 is supported in the cylinder of the outer cylinder 3 through a partition plate 8, and the partition plate 8 is positioned in the middle of the middle-layer sleeve 6 in the length direction. The middle layer sleeve 6 adopts a double-layer structure, sound absorption materials are filled in the middle layer sleeve 6, an inner tube plate of the middle layer sleeve 6 is a perforated plate, the perforation rate of the perforated plate is 30%, and the perforation aperture is 5 mm. An inner cylinder body 7 is fixedly arranged in the middle-layer sleeve 6, a sound absorption material is filled in the core part of the inner cylinder body 7, a cylinder plate of the cylinder body is a perforated plate, the perforation rate of the cylinder plate is 30%, and the perforation aperture is 5 mm. An air inlet guide cone 17 and an air outlet guide cone 16 are respectively arranged at two ends of the inner cylinder body 7, and the inner cylinder body 7 is fixedly arranged in the middle-layer sleeve 6 through a support rod 10. Partition plate guard plates 8 are arranged on two sides of the partition plate 8, the partition plate guard plates 8 are perforated plates, and sound absorption materials are filled between the partition plate 8 and the partition plate guard plates 9;

a resonance clapboard 11 is arranged in the outer cylinder 3 along the radial direction, a resonance throat 12 is arranged on the resonance clapboard 11, and a resonance cavity 13 is formed between the resonance clapboard 11 and a rear end cover 14. The overhanging end of the air inlet pipe 1 is provided with an air inlet flange, and the overhanging end of the air outlet pipe 15 is provided with an air outlet flange. A pair of mounting brackets 20 are also welded to the outer shell of the outer cylinder 3.

The foregoing has outlined some of the preferred embodiments of the present invention, but the present invention is not limited thereto, and many modifications and variations are possible. For example, the sound absorption material can be rock wool or glass fiber, and can also be other common sound absorption materials; the perforation rate is preferably 25-30%, the perforation aperture is preferably 4-6 mm, and the central line of the air outlet pipe 15 and the central line of the outer cylinder 3 can be either perpendicular or crossed with a certain angle. These variations and modifications are all within the scope of the present invention.

Claims

1. The utility model provides a spark extinguishes silencer with resonant cavity, includes outer barrel (3), at the both ends difference fixedly connected with inlet end cover (2) and rear end cap (14) of outer barrel (3), is provided with intake pipe (1) with running through on inlet end cover (2), is provided with outlet duct (15), its characterized in that on outer barrel (3): the wall of the outer cylinder (3) adopts a double-layer structure, sound absorption materials are filled in the wall of the outer cylinder, and an inner cylinder plate of the wall of the outer cylinder (3) is a perforated plate; the air inlet end cover (2) is also of a double-layer structure, sound absorption materials are filled in the air inlet end cover, and an inner wall plate of the air inlet end cover (2) is a perforated plate; the extending end of the air inlet pipe (1) is connected with a cyclone cylinder (4), the cyclone cylinder (4) comprises a plurality of cyclone blades (21) which are arranged at intervals along the circumferential direction, and a cyclone cylinder end plate (5) is fixed on the cyclone cylinder (4); a middle-layer sleeve (6) is supported in the cylinder of the outer cylinder body (3) through a partition plate (8), the middle-layer sleeve (6) adopts a double-layer structure, sound-absorbing materials are filled in the middle-layer sleeve (6), and an inner cylinder plate of the middle-layer sleeve (6) is a perforated plate; an inner cylinder body (7) is fixedly arranged in the cylinder of the middle-layer sleeve (6), a core part of the inner cylinder body (7) is filled with sound absorption materials, and a cylinder plate of the cylinder body is a perforated plate; partition plate guard plates (9) are arranged on two sides of the partition plate (8), the partition plate guard plates (9) are perforated plates, and sound absorption materials are filled between the partition plate (8) and the partition plate guard plates (9); a resonance clapboard (11) is arranged in the outer cylinder (3) along the radial direction, a resonance throat (12) is arranged on the resonance clapboard (11), a resonance cavity (13) is formed between the resonance clapboard (11) and the rear end cover (14), and the central line of the air outlet pipe (15) is crossed with the central line of the outer cylinder (3).

2. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the swirl vanes (21) are arranged along the circumferential tangent of the cylinder body of the swirl cylinder (4) in general, and an air inlet channel is formed at the interval between two adjacent swirl plates (21).

3. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the two ends of the inner cylinder body (7) are respectively provided with an air inlet guide cone (17) and an air outlet guide cone (16), and the inner cylinder body (7) is fixedly arranged in the middle-layer sleeve (6) through a support rod (10).

4. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the inner cylinder plate of the outer cylinder (3), the cylinder plate of the inner cylinder (7) and the inner cylinder plate of the middle layer sleeve (6) have the perforation rate of 25-30 percent and the penetration aperture is 4-8 mm.

5. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the clapboard (8) is positioned in the middle of the middle sleeve (6) in the length direction.

6. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the central line of the air inlet pipe (1) and the central line of the outer cylinder body (3) are positioned on the same straight line, and the central line of the air outlet pipe (15) is vertical to the central line of the outer cylinder body (3).

7. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the sound absorption material is rock wool or glass fiber, and glass fiber cloth is lined between the glass fiber and the perforated plate.

8. A spark-extinguishing muffler having a resonant cavity as set forth in claim 1, wherein: the outer cylinder body (3) is provided with a dust collecting port (18), and the dust collecting port (18) leads to a dust collecting hopper (19) from the interior of the outer cylinder body (3); the position of the ash collecting hopper (19) corresponds to the position of the cyclone cylinder (4).