CN217999691U - Expansion chamber silencer - Google Patents

Abstract

The utility model belongs to the technical field of the silencer, a expansion chamber silencer is disclosed, including main expansion chamber, vice expansion chamber and piston assembly, main expansion chamber and exhaust system's exhaust duct intercommunication, vice expansion chamber includes first sleeve pipe and second sleeve pipe, and first bushing connection is in main expansion chamber, and the second sleeve pipe is sealed to wear to locate first sleeve pipe adjustably along axial position, and the second sleeve pipe stretches out first sheathed tube one end closing cap and has the end plate. The piston assembly is movably arranged in the second sleeve and is in sealing contact with the inner wall of the second sleeve. Through setting up nested vice expansion chamber and mobilizable piston assembly, can effectively increase the volume control range of vice expansion chamber. The frequency band of the silencer for eliminating low-frequency noise can be changed by adjusting the volume of the auxiliary expansion chamber so as to be matched with the frequency band of the low-frequency noise in the exhaust of the diesel engine in actual working conditions, thereby achieving the purpose of good silencing and noise reduction, and meeting the driving requirements of ships in specific water areas with higher requirements for silencing and noise reduction.

Description

Expansion chamber silencer

Technical Field

The utility model relates to a silencer technical field especially relates to an expansion chamber silencer.

Background

The expansion chamber silencer utilizes sudden expansion or contraction of the section of the pipeline to generate acoustic impedance mutation in the pipeline, so that sound waves of certain frequencies transmitted in the pipeline are reflected back to a sound source, and the aim of silencing is achieved. The expansion chamber silencer has a simple structure, the expansion ratio of the expansion chamber determines the size of silencing quantity, and the silencing frequency is determined by the length of the expansion chamber. The sound-damping properties of a silencer structure are thus determined when it is set.

The diesel engine is used as a main flow power product for ship propulsion at present and is widely applied to ships. The operation of diesel engines generates strong noise, so that most of the ships propelled by the diesel engines are provided with silencers for reducing the noise of the ships. However, some marine ordinary silencers often cannot effectively reduce low-frequency noise below 150 hz, and in a specific water area with high requirements on silencing and noise reducing, the ordinary silencers cannot meet the requirements on silencing and noise reducing. Meanwhile, the operation of the ship is influenced by the standard exceeding of low-frequency noise, and economic loss is caused.

The existing expansion chamber silencer usually has a specific length and a specific volume, so that the existing expansion chamber silencer can only be used for low-frequency noise in a certain frequency band, and the noise in the frequency band does not necessarily appear in exhaust noise of ships. The noise elimination and reduction requirements are probably not met when the water passes through a specific water area with higher requirements on noise elimination and reduction, and the defects exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an expansion chamber silencer can change the frequency channel that the silencer eliminated the low frequency noise to coincide with the frequency channel of the low frequency noise among the operating condition in the diesel engine exhaust, thereby reach the purpose of making an uproar falls in the good noise elimination.

To achieve the purpose, the utility model adopts the following technical proposal:

provided is an expansion chamber muffler including:

a primary expansion chamber configured to communicate with an exhaust conduit of an exhaust system;

the auxiliary expansion chamber comprises a first sleeve and a second sleeve, the first sleeve is connected to the main expansion chamber, the second sleeve is arranged in the first sleeve in a sealing and penetrating mode along the axial position in an adjustable and sealing mode, and one end, extending out of the first sleeve, of the second sleeve is covered with an end plate in a sealing mode;

and the piston assembly is movably arranged in the second sleeve and is in sealing contact with the inner wall of the second sleeve.

As the utility model provides an expansion chamber silencer's preferred scheme still includes fastening components, first sleeve is fitted with a contraceptive ring and is equipped with first flange, the end plate is fitted with a contraceptive ring and is equipped with the second flange, fastening components wears to establish the connection first flange with the second flange.

As the utility model provides an expansion chamber silencer's preferred scheme, fastening components includes first screw rod, first screw rod runs through first flange with the second flange, on the first screw rod in the both sides of first flange all are equipped with first nut, just in the both sides of second flange all are equipped with the second nut.

As the utility model provides a preferred scheme of expansion chamber silencer, fastening components is provided with a plurality ofly, at least two fastening components is relative the sheathed tube axis symmetry of second sets up.

As the utility model provides a preferred scheme of expansion chamber silencer, the nut seat is worn to be equipped with fixedly in the center of end plate, piston assembly include the movable piston and connect in the second screw rod at movable piston center, the movable piston movably set up in the second cover, second screw rod screw thread revolve twist in the nut seat.

As the utility model provides a preferred scheme of expansion chamber silencer, the second screw rod stretches out the sheathed tube one end of second is provided with twists the twist handle.

As the utility model provides a preferred scheme of expansion chamber silencer, the activity piston includes the piston plectane, the piston plectane is fitted with a contraceptive ring and is equipped with the piston bobbin, the second screw rod connect in the center of piston plectane, the piston bobbin with the sealed and sliding contact of second sheathed tube inner wall.

As the utility model provides an optimal scheme of expansion chamber silencer, the center of piston plectane is provided with solid fixed ring, the tip of second screw rod is inlayed and is located in the fixed ring, gu fixed ring's outer wall with be connected with a plurality of enhancement brackets between the inner wall of piston barrel pipe, it is a plurality of it is relative to strengthen the brackets gu fixed ring is circumference evenly distributed.

As the utility model provides a preferred scheme of expansion chamber silencer, first sleeve pipe with the perpendicular intercommunication of main expansion chamber.

As the utility model provides an expansion chamber silencer's preferred scheme, be provided with intake pipe and blast pipe on the main expansion chamber, the blast pipe with the intake pipe is straight tube or return bend.

The utility model has the advantages that:

the utility model provides an expansion chamber silencer, including main expansion chamber, vice expansion chamber and piston assembly, main expansion chamber is configured to communicate with exhaust system's exhaust duct, exemplarily, when installing this expansion chamber silencer on diesel engine exhaust system, can connect main expansion chamber on exhaust system's exhaust duct, makes the exhaust through main expansion chamber. Vice expansion chamber is nested formula structure, and it includes first sleeve pipe and second sleeve pipe, and first sleeve pipe is connected in main expansion chamber, and the second sleeve pipe is sealed to wear to locate first sleeve pipe along axial position adjustablely, and the second sleeve pipe stretches out first sheathed tube one end closing cap has the end plate, through the volume of adjusting the vice expansion chamber of second sleeve pipe position adjustable in first sleeve pipe. Piston assembly movably sets up in the second sleeve to with the sealed contact of second sheathed tube inner wall, when the position of adjusting piston assembly along the axial of second sleeve, can adjust the volume of second sleeve orientation first sleeve one side. Through setting up the vice expansion chamber of nested formula, and mobilizable piston assembly, can effectively increase the volume control range of vice expansion chamber, because vice expansion chamber volume can be adjusted in succession, consequently can improve the problem that the low frequency noise elimination volume of expansion chamber silencer is not enough, change the noise elimination volume size of specific frequency through adjusting vice expansion chamber's volume size, realize the continuous change of silencer low frequency noise elimination performance, along with the increase of vice expansion chamber volume, best noise elimination frequency moves to the low frequency, at the specific waters that the requirement is higher to the noise reduction of eliminating, can satisfy boats and ships and travel the requirement.

Drawings

FIG. 1 is a first isometric view of an expansion chamber muffler according to an embodiment of the present invention;

FIG. 2 is a second isometric view of an expansion chamber muffler according to an embodiment of the present invention;

FIG. 3 is a third isometric view of an expansion chamber muffler according to an embodiment of the present invention;

FIG. 4 is an isometric view of a second sleeve provided in accordance with an embodiment of the present invention;

fig. 5 is a first isometric view of a piston assembly provided in accordance with an embodiment of the present invention;

fig. 6 is a second isometric view of a piston assembly according to an embodiment of the present invention.

In the figure:

1. a primary expansion chamber; 2. a secondary expansion chamber; 3. a piston assembly; 4. a fastening assembly; 5. an air inlet pipe; 6. an exhaust pipe;

21. a first sleeve; 22. a second sleeve; 221. an end plate;

211. a first flange; 2211. a second flange; 2212. a nut seat;

31. a movable piston; 32. a second screw; 33. screwing the handle; 34. a third nut;

311. a piston circular plate; 312. a piston barrel; 313. a fixing ring; 314. a reinforcing toggle plate;

41. a first screw; 42. a first nut; 43. a second nut.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, 2 and 3, the present embodiment provides an extension chamber muffler including a main extension chamber 1, a sub extension chamber 2 and a piston assembly 3.

The main expansion chamber 1 is configured to communicate with an exhaust pipe of an exhaust system, and for example, when the expansion chamber muffler is mounted on a diesel exhaust system, the main expansion chamber 1 may be connected to the exhaust pipe of the exhaust system to pass exhaust gas through the main expansion chamber 1. Referring to fig. 1, 2 and 3, the secondary expansion chamber 2 is a nested structure, and includes a first sleeve 21 and a second sleeve 22, the first sleeve 21 is connected to the primary expansion chamber 1, the second sleeve 22 is arranged in the first sleeve 21 in a sealing manner along an axial position, the end of the second sleeve 22 extending out of the first sleeve 21 is covered with an end plate 221, and the volume of the secondary expansion chamber 2 can be adjusted by adjusting the position of the second sleeve 22 in the first sleeve 21. The piston assembly 3 is movably disposed in the second sleeve 22 and is in sealing contact with the inner wall of the second sleeve 22, and when the position of the piston assembly 3 is adjusted along the axial direction of the second sleeve 22, the volume of the second sleeve 22 facing the first sleeve 21 can be adjusted.

Through setting up nested vice expansion chamber 2, and mobilizable piston assembly 3, can effectively increase the volume control range of vice expansion chamber 2, because vice expansion chamber 2 volume can be adjusted in succession, consequently, can improve the problem that the low frequency noise elimination volume of expansion chamber silencer is not enough, change the noise elimination volume size of specific frequency through the volume size of adjusting vice expansion chamber 2, realize the continuous change of silencer low frequency noise elimination performance, along with the increase of vice expansion chamber 2 volume, best noise elimination frequency moves to the low frequency, in the higher specific waters of noise reduction requirement, can satisfy the boats and ships requirement of traveling.

Referring to fig. 3, an air inlet pipe 5 and an air outlet pipe 6 are arranged on the main expansion chamber 1, and the air inlet pipe 5 and the air outlet pipe 6 are used for being connected with an air outlet pipeline of a diesel engine exhaust system, so that diesel engine exhaust enters the interior of the muffler through the air inlet pipe 5, is discharged through the air outlet pipe 6, and is introduced into the next section of the air outlet pipeline again. Further, the exhaust pipe 6 and the intake pipe 5 are straight pipes or bent pipes. In this embodiment, the air inlet pipe 5 is a straight pipe, and is provided with a flange plate for connecting with an exhaust pipeline, the exhaust pipe 6 is a bent pipe, and is also provided with a flange plate for connecting with an exhaust pipeline, and the bent pipe can change direction so as to be smoothly connected with the exhaust pipeline. During actual design, the exhaust pipe 6 and the air inlet pipe 5 can be designed to be straight pipes or bent pipes according to the position adaptability of the exhaust pipeline.

Referring to fig. 1 and 3, the first casing 21 is in vertical communication with the main expansion chamber 1. That is, the first sleeve 21 is branched from the main extension chamber 1, and when the second sleeve 22 and the forward/backward adjustment piston assembly 3 are adjusted forward/backward, a sufficient operation space is provided, and the mounting and dismounting are also convenient.

Alternatively, the first and second ferrules 21 and 22 are secured using the fastening assembly 4 while the second ferrule 22 is adjusted in position relative to the first ferrule 21. In particular, with reference to fig. 1 and 4, the first sleeve 21 is provided with a first flange 211 on the upper ring, the first flange 211 being located at a port of the first sleeve 21 remote from the main expansion chamber 1. The end plate 221 is annularly provided with a second flange 2211, and the fastening assembly 4 is inserted and connected to the first flange 211 and the second flange 2211 to fix the position of the second sleeve 22 relative to the first sleeve 21.

More specifically, a plurality of connection holes are circumferentially spaced on both the first flange 211 and the second flange 2211. Fastening assembly 4 includes a first threaded rod 41, and first threaded rod 41 extends through the attachment hole in first flange 211 and the attachment hole in second flange 2211. First nuts 42 are respectively sleeved on the two sides of the first flange 211 of the first screw 41, and second nuts 43 are respectively sleeved on the two sides of the second flange 2211. The first nuts 42 on both sides of the first flange 211 are screwed to fix the first flange 211 and the first screw 41, and the second nuts 43 on both sides of the second flange 2211 are screwed to fix the second flange 2211 and the first screw 41. Furthermore, two ends of the first screw rod 41 have no stop structures, so that the first screw rod is convenient to disassemble.

Alternatively, the fastening assembly 4 is provided in plurality, and at least two fastening assemblies 4 are symmetrically arranged with respect to the axis of the second sleeve 22. In this embodiment, two fastening assemblies 4 are symmetrically disposed on the first flange 211 and the second flange 2211, and when the position of the second sleeve 22 relative to the first sleeve 21 is adjusted, the fixing step is not too complicated, so as to avoid spending a lot of time to screw a plurality of first nuts 42 and second nuts 43.

Of course, in other embodiments, the number of fastening assemblies 4 used may be determined according to the required connection strength between the second flange 2211 and the first flange 211, and may be circumferentially and uniformly distributed on the outer side of the second sleeve 22 to ensure the stress balance.

In this embodiment, the first nuts 42 are disposed on both sides of the first flange 211, and the second nuts 43 are disposed on both sides of the second flange 2211, so that the position of the second sleeve 22 can be fixed, and the second sleeve 22 can be prevented from moving due to vibration generated by the operation of the diesel engine.

Fig. 5 and 6 show a structural entity diagram of the piston assembly 3 provided in the present embodiment. The piston assembly 3 includes a movable piston 31 and a second screw 32 coupled to the center of the movable piston 31. Referring to fig. 1 and 3, a nut seat 2212 is fixedly formed through the center of the end plate 221, and the nut seat 2212 may be welded to the center of the end plate 221, for example. The second screw 32 is screwed into the nut seat 2212, and the movable piston 31 is movably disposed in the second sleeve 22. The position of the movable piston 31 is adjusted in the axial direction of the second sleeve 22 by screwing the second screw 32, thereby changing the volume inside the second sleeve 22 communicating with the first sleeve 21.

The second screw 32 and the nut seat 2212 are arranged, and after the position of the movable piston 31 is adjusted, no other fixing measures are needed. There is great fastening force between second screw rod 32 and nut seat 2212 to high-temperature high-pressure abominable operating mode can be avoided vibration and movable piston 31 drunkenness phenomenon when the adaptation diesel engine exhausts.

Further, referring to fig. 5 and 6, in order to apply torque when screwing the second screw 32, a screwing knob 33 is provided at an end of the second screw 32 protruding out of the second sleeve 22. Specifically, the screwing handle 33 is a rod-shaped structure, the central portion thereof penetrates through the end portion of the second screw 32 and is perpendicular to the second screw 32, the screwing handle 33 perpendicular to the second screw 32 can apply a rotation moment more easily, and the second screw 32 can be screwed more easily.

With reference to fig. 5 and 6, third nuts are respectively sleeved on the second screw rod 32 on both sides of the screwing handle 33, and the rotating handle can be firmly fixed on the second screw rod 32 by screwing the two third nuts 34.

Referring to fig. 5 and 6, the movable piston 31 includes a piston circular plate 311, a piston barrel 312 is disposed around the piston circular plate 311, the second screw 32 is connected to the center of the piston circular plate 311, and the outer wall of the piston barrel 312 is in sealing and sliding contact with the inner wall of the second sleeve 22, so that the movable piston 31 and the inner wall of the second sleeve 22 have a sufficient contact area to improve the sealing performance. Further, a layer of sealing rubber pad may be disposed on the outer wall of the piston bobbin 312.

Referring to fig. 6, in order to make the connection between the second screw 32 and the piston disk 311 more stable, a fixing ring 313 is disposed at the center of the piston disk 311, and the fixing ring 313 may be welded to the piston disk 311, so that the connection is more stable and reliable. The end of the second screw rod 32 is embedded in the fixing ring 313, so that the connection between the second screw rod 32 and the piston circular plate 311 is more convenient and the connection is more stable. The second screw 32 may be welded into the fixing ring 313. In addition, the fixing ring 313 also plays a positioning role when the second screw 32 is installed.

Further, a plurality of reinforcing brackets 314 are connected between the outer wall of the fixing ring 313 and the inner wall of the piston cylinder 312 to enhance the mounting strength of the fixing ring 313 to the piston disk 311 and prevent deformation or breakage of connection with the piston disk 311. The plurality of reinforcing toggle plates 314 are circumferentially and uniformly distributed with respect to the fixing ring 313 to make the forces applied to the piston circular plate 311 and the piston bobbin 312 more uniform. Illustratively, the present embodiment provides three reinforcing brackets 314, and the angles between adjacent reinforcing brackets 314 are 120 degrees. Other embodiments may adaptively select the number and distribution of the reinforcing toggle plates 314.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An expansion chamber muffler, comprising:

a main expansion chamber (1) configured to communicate with an exhaust duct of an exhaust system;

the auxiliary expansion chamber (2) comprises a first sleeve (21) and a second sleeve (22), the first sleeve (21) is connected to the main expansion chamber (1), the second sleeve (22) is arranged in the first sleeve (21) in a sealing and penetrating mode along the axial position in an adjustable and sealing mode, and one end, extending out of the first sleeve (21), of the second sleeve (22) is covered with an end plate (221);

and the piston assembly (3) is movably arranged in the second sleeve (22) and is in sealing contact with the inner wall of the second sleeve (22).

2. The expanding chamber muffler according to claim 1, further comprising a fastening assembly (4), wherein the first sleeve (21) is annularly provided with a first flange (211), the end plate (221) is annularly provided with a second flange (2211), and the fastening assembly (4) is penetratingly connected with the first flange (211) and the second flange (2211).

3. The extension chamber muffler of claim 2, wherein the fastening assembly (4) comprises a first screw (41), the first screw (41) penetrates the first flange (211) and the second flange (2211), a first nut (42) is sleeved on the first screw (41) on both sides of the first flange (211), and a second nut (43) is sleeved on both sides of the second flange (2211).

4. The expansion chamber muffler according to claim 2, wherein the fastening assembly (4) is provided in plurality, at least two of the fastening assemblies (4) being symmetrically arranged with respect to the axis of the second sleeve (22).

5. The diverging chamber muffler as defined in claim 1, wherein a nut seat (2212) is fixedly penetrated in the center of the end plate (221), the piston assembly (3) comprises a movable piston (31) and a second screw (32) connected to the center of the movable piston (31), the movable piston (31) is movably disposed in the second sleeve (22), and the second screw (32) is screwed into the nut seat (2212).

6. The expansion chamber muffler according to claim 5, wherein the end of the second screw (32) protruding out of the second sleeve (22) is provided with a screw knob (33).

7. The expansion chamber muffler according to claim 5, wherein the movable piston (31) comprises a piston circular plate (311), a piston cylindrical pipe (312) is annularly arranged on the piston circular plate (311), the second screw (32) is connected to the center of the piston circular plate (311), and the piston cylindrical pipe (312) is in sealing and sliding contact with the inner wall of the second sleeve (22).

8. The muffler as claimed in claim 7, wherein a fixing ring (313) is disposed at the center of the piston circular plate (311), the end of the second screw (32) is embedded in the fixing ring (313), a plurality of reinforcing toggle plates (314) are connected between the outer wall of the fixing ring (313) and the inner wall of the piston barrel (312), and the plurality of reinforcing toggle plates (314) are circumferentially and uniformly distributed with respect to the fixing ring (313).

9. The expansion chamber muffler according to any one of claims 1-8, characterized in that the first bushing (21) communicates perpendicularly with the main expansion chamber (1).

10. The expansion chamber muffler according to any one of claims 1 to 8, wherein the main expansion chamber (1) is provided with an inlet pipe (5) and an outlet pipe (6), and the outlet pipe (6) and the inlet pipe (5) are straight pipes or bent pipes.

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