CN210743575U - Composite silencer - Google Patents

Abstract

The utility model discloses a composite muffler, which comprises a silencing outer pipe, a silencing inner pipe and a connecting support piece, wherein the connecting support piece is used for connecting the silencing inner pipe and the silencing outer pipe, and one side of the connecting support piece is provided with an air inlet; the two ends of the silencing inner pipe are both opened, one end of the silencing inner pipe is embedded in the connecting support and communicated with the air inlet, and the diameter of the silencing inner pipe is larger than the caliber of the air inlet; one end of the silencing outer pipe is sleeved on the connecting support piece, the other end of the silencing outer pipe is arranged in a closed mode, an air exhaust port is formed in the side wall of the silencing outer pipe, a labyrinth air flow channel is formed between the silencing inner pipe and the silencing inner pipe, sound absorption materials are filled in the labyrinth air flow channel, and the sound absorption materials are porous sound absorption fibrous bodies, so that air flow is in full contact with the sound absorption fibrous bodies. The utility model discloses utilize the diffusion characteristic, resistive property, resistance characteristic, the labyrinth characteristic of silencer simultaneously, can both gain the efficient noise elimination effect to pulse airflow, high velocity air, low velocity air.

Description

Composite silencer

Technical Field

The utility model relates to a noise elimination equipment technical field, concretely relates to compound silencer.

Background

With the rapid development of economy and the tightening of environmental protection policies, the muffler technology has been applied to various fields of industry and civil use on a large scale, wherein the use of mufflers is on an increasing trend. The silencer aiming at pulse airflow and high-speed continuous airflow noise sources has several general defects, one is that the airflow is not uniform and has insufficient speed reduction, if the airflow cannot be sufficiently reduced, particularly the high-speed airflow at the central part of the airflow can directly rush out of the silencer, the noise generated by the high-speed friction of the airflow clamps equipment and other noise quickly rush out of the silencer, so that when the airflow is sprayed out, the airflow speed is rapidly reduced uniformly, and the edge noise is reduced as much as possible; secondly, the silencing performance of the silencer is reduced in certain frequency bands, and the silencer is difficult to adapt to places of full-frequency-band noise sources.

The existing market basically adopts a reactive muffler aiming at a pulse airflow muffler, adopts a resistive muffler or a resistance composite muffler aiming at continuous airflow, and has the following defects: the resistance noise elimination part has poor effect at the part higher than the failure frequency, the resistance effect caused by the air pipe and the area expansion part of the silencer is only excellent according to the different sizes of the silencer when the expansion chamber L is odd times of 1/4 wavelength, but the noise elimination quantity is zero when the expansion chamber L is times of half wavelength; generally, pulse airflow or high-speed airflow is non-uniform airflow, and no matter the air pressure and the airflow are all unsteady, sometimes the variation range is even large, so that the frequency and the wavelength are greatly changed, and under the condition, the traditional silencer is difficult to obtain a good effect, so that no product can provide a good silencing effect for the pulse airflow and the continuous airflow.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a composite muffler utilizes the diffusion characteristic, resistive property, resistance characteristic, the labyrinth characteristic of silencer simultaneously, with the fine integration of four kinds of noise elimination characteristics on same silencer, can both gain efficient noise cancelling effect to pulse air current, high velocity air current, low velocity air current.

In order to solve the technical problem, the utility model provides a composite muffler, including noise elimination outer tube, noise elimination inner tube, connection support piece, the connection support piece is used for connecting the noise elimination inner tube and noise elimination outer tube, one side of connection support piece is provided with the air inlet; the two ends of the silencing inner pipe are both opened, one end of the silencing inner pipe is embedded in the connecting support piece and is communicated with the air inlet, and the diameter of the silencing inner pipe is larger than the caliber of the air inlet; one end of the silencing outer pipe is sleeved on the connecting support piece, the other end of the silencing outer pipe is arranged in a closed mode, an air outlet is formed in the side wall of the silencing outer pipe, a labyrinth type air flow channel is formed between the silencing outer pipe and the silencing inner pipe, sound absorption materials are filled in the labyrinth type air flow channel, and the sound absorption materials are porous sound absorption fiber bodies, so that air flow is in full contact with the sound absorption fiber bodies.

The utility model discloses a preferred embodiment, further include two-layer noise elimination outer tube, the noise elimination outer tube is established in proper order and is established on the connection holds in the palm the piece, all is provided with the gas vent on the lateral wall of every layer of noise elimination outer tube, and the air current gets into from the air inlet and passes two-layer noise elimination outer tube in proper order.

In a preferred embodiment of the present invention, the sound absorbing material further comprises one of centrifugal glass wool, polyester fiber wool, ceramic fiber wool, metal fiber, and coconut fiber.

In a preferred embodiment of the present invention, the noise elimination inner tube and the noise elimination outer tube are both fixedly connected to the connection support member through threads.

In a preferred embodiment of the present invention, the air inlet is provided with a standardized interface.

In a preferred embodiment of the present invention, the exhaust port is disposed at an end of the labyrinth airflow passage.

In a preferred embodiment of the present invention, the exhaust hole is provided with a plurality of exhaust holes.

The utility model has the advantages that: the utility model utilizes the diffusion characteristic, the resistance characteristic and the labyrinth characteristic of the silencer simultaneously, and integrates four kinds of silencing characteristics on the same silencer;

diffusion property: by arranging the sound absorption material, the airflow is quickly and uniformly decelerated by utilizing the diffusion effect of the porous sound absorption fibrous body, the flowing speed of the airflow is reduced, and the corresponding sound is weakened;

resistance characteristics: the diameter of the silencing inner pipe is larger than the caliber of the air inlet, so that sound waves enter from the air inlet and then expand and diffuse in the silencing inner pipe, and the sound waves with specific wavelengths can be eliminated;

and (3) resistive characteristics: the air current continuously flows through the porous sound absorption fibrous body, effectively utilizes the resistive characteristic, makes sound wave fully contact with the porous sound absorption fibrous body, makes the sound wave fully convert sound energy into heat energy in frictional resistance and viscous resistance.

Labyrinth characteristics: through the setting of interior outer tube, make the air current passageway form one and make a round trip or a plurality of round trips, make the sound wave make a round trip to reflect many times, fully make air current and sound absorbing material contact simultaneously, shortened silencer length again greatly, make full use of labyrinth, resistive noise elimination characteristic combined action effect.

The utility model discloses a composite muffler through the compound setting of above-mentioned four kinds of characteristics, can both gain the efficient noise elimination effect to pulse airflow, high velocity air, low velocity air.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the composite muffler of the present invention;

fig. 2 is a schematic structural view of another embodiment of the composite muffler of the present invention.

The reference numbers in the figures illustrate: 1. a silencing outer tube; 2. a silencing inner pipe; 3. a coupling holder; 4. an air inlet; 5. an exhaust port; 6. a labyrinth airflow path; 7. a sound absorbing material; 8. the interface is standardized.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1, an embodiment of the composite muffler of the present invention includes an outer muffling tube 1, an inner muffling tube 2, and a connecting support 3, where the connecting support 3 is used to connect the inner muffling tube 2 and the outer muffling tube 1, and an air inlet 4 is disposed on one side of the connecting support 3; both ends of the silencing inner pipe 2 are open, one end of the silencing inner pipe 2 is embedded in the connecting support piece 3 and is communicated with the air inlet 4, and the diameter of the silencing inner pipe 2 is larger than the caliber of the air inlet 4; one end of the silencing outer pipe 1 is sleeved on the connecting support piece 3, the other end of the silencing outer pipe is arranged in a closed mode, an exhaust port 5 is formed in the side wall of the silencing outer pipe 1, a labyrinth type airflow channel 6 is formed between the silencing outer pipe 1 and the silencing inner pipe 2, a sound absorption material 7 is filled in the labyrinth type airflow channel 6, the sound absorption material 7 is a porous sound absorption fibrous body, and when the airflow passes through, the airflow is enabled to be in full contact with the sound absorption fibrous body.

Specifically, after flowing in from the air inlet 4, the air flow flows into the silencing inner tube 2, because the diameter of the silencing inner tube 2 is larger than the caliber of the air inlet 4, the sound wave enters from the air inlet 4 and expands and diffuses in the silencing inner tube 2, the resistance characteristic can be achieved through the diffusion, so that the sound wave with a specific wavelength is eliminated, after resistance silencing, the air flow flows through the labyrinth air flow channel 6, the labyrinth air flow channel 6 is filled with porous sound-absorbing fiber bodies, the air flow is rapidly and uniformly decelerated by the diffusion effect of the porous sound-absorbing fiber bodies, the flow speed of the air flow is reduced, the corresponding sound is weakened, and the resistance characteristic is effectively utilized while the air flow is decelerated, so that the sound wave is fully contacted with the porous sound-absorbing fiber bodies, and the sound energy is fully converted into heat energy in friction resistance and viscous resistance, finally, through the arrangement of the inner pipe and the outer pipe, the labyrinth type airflow channel 6 is formed to make one or more back and forth, so that sound waves are reflected back and forth for many times, airflow is fully contacted with the sound absorption material 7, the length of the silencer is greatly shortened, and the combined effect of the labyrinth type and the resistive silencing characteristics is fully utilized.

Referring to fig. 2, the utility model discloses a compound silencer's another embodiment, for further improvement noise elimination effect, include two-layer noise elimination outer tube 1 in this embodiment, noise elimination outer tube 1 overlaps in proper order and establishes on connection support 3, all be provided with gas vent 5 on every layer of noise elimination outer tube 1's the lateral wall, the air current gets into from air inlet 4 and passes two-layer noise elimination outer tube 1 in proper order, labyrinth air flow channel 6's length has been increased, the air current has further been increased with porous sound absorption fibrous body contact area, further improved sound absorption effect, in other embodiments, also can set up more layers of noise elimination outer tube 1 according to actual user demand, set up longer labyrinth air flow channel 6.

Specifically, the sound absorption material 7 comprises one of centrifugal glass wool, polyester fiber wool, ceramic fiber wool, metal fiber and coconut fiber, and different sound absorption materials 7 can be adopted according to the use requirement.

Specifically, the silencing inner pipe 2 and the silencing outer pipe 1 are fixedly connected with the connecting support piece 3 through threads, so that the sound absorption material 7 in the inner part is convenient to detach and replace.

Specifically, air inlet 4 department is provided with standardized interface 8, and the installation butt joint of being convenient for does not need to add the adapter newly.

Specifically, the exhaust port 5 is arranged at the tail end of the labyrinth airflow channel 6, the length of airflow flowing through the labyrinth airflow channel 6 is long enough as much as possible, and a plurality of exhaust holes are formed in the exhaust port 5.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims (7)

1. A composite muffler is characterized by comprising a muffling outer tube, a muffling inner tube and a connecting support piece, wherein the connecting support piece is used for connecting the muffling inner tube and the muffling outer tube, and one side of the connecting support piece is provided with an air inlet; the two ends of the silencing inner pipe are both opened, one end of the silencing inner pipe is embedded in the connecting support piece and is communicated with the air inlet, and the diameter of the silencing inner pipe is larger than the caliber of the air inlet; one end of the silencing outer pipe is sleeved on the connecting support piece, the other end of the silencing outer pipe is arranged in a closed mode, an air outlet is formed in the side wall of the silencing outer pipe, a labyrinth type air flow channel is formed between the silencing outer pipe and the silencing inner pipe, sound absorption materials are filled in the labyrinth type air flow channel, and the sound absorption materials are porous sound absorption fiber bodies, so that air flow is in full contact with the sound absorption fiber bodies.

2. The composite muffler of claim 1, comprising two layers of outer muffling pipes, wherein the outer muffling pipes are sequentially sleeved on the connecting support, the side wall of each layer of outer muffling pipe is provided with an air outlet, and air flow enters from the air inlet and sequentially passes through the two layers of outer muffling pipes.

3. The composite muffler of claim 1, wherein the sound absorbing material comprises one of spun glass wool, polyester fiber wool, ceramic fiber wool, metal fiber, coconut fiber.

4. The composite muffler of claim 1, wherein the inner and outer muffling pipes are each fixedly attached to the coupling bracket by threads.

5. The composite muffler of claim 1, wherein a standardized interface is provided at the air inlet.

6. The composite muffler of claim 1, wherein the exhaust port is disposed at an end of a labyrinth airflow passage.

7. The composite muffler of claim 1, wherein a plurality of exhaust holes are provided at the exhaust port.

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