CN221220595U - Silencer (muffler) - Google Patents

Abstract

A muffler includes a housing, a support plate positioned within the housing, and a core tube assembly. The housing includes a first sound deadening chamber and a second sound deadening chamber. The support plate includes a communication hole that communicates the first sound deadening chamber and the second sound deadening chamber. The core tube assembly includes a core tube, a cover plate overlying the core tube, and an airflow passage between an outer wall surface of the core tube and an inner wall surface of the cover plate. The opening of the air flow channel is communicated with the second silencing cavity. The core pipe comprises a silencing hole positioned in the first silencing cavity, a sound blocking groove positioned in the first silencing cavity and positioned at the upstream of the silencing hole along the airflow flowing direction, and a standing wave hole positioned in the second silencing cavity, and the silencing hole is communicated with the airflow channel. Through setting up the sound blocking groove, the amortization hole reaches the standing wave hole, can reduce the NVH level of well low frequency channel effectively.

Description

Silencer (muffler)

Technical Field

The utility model relates to a silencer, and belongs to the technical field of exhaust systems.

Background

The muffler in the related art generally includes a housing and a core pipe fixed inside the housing, the core pipe being generally provided with a sound deadening hole for sound deadening. Although the muffler in the related art can generally reduce NVH (noise, vibration and harshness) levels in a wide range, the NVH improving effect is limited for certain frequency bands where decibels are high.

Accordingly, there is a need to develop a muffler having an improved structure.

Disclosure of utility model

The utility model aims to provide a silencer capable of reducing middle-low frequency airflow noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a muffler including a housing including a first sound deadening chamber located at one side of the support plate and a second sound deadening chamber located at the other side of the support plate, a support plate located within the housing, and a core tube assembly at least partially penetrating the support plate, the support plate including a communication hole communicating the first sound deadening chamber and the second sound deadening chamber, the core tube assembly including a core tube, a cover plate covering the core tube, and an airflow passage located between an outer wall surface of the core tube and an inner wall surface of the cover plate, an opening of the airflow passage being in communication with the second sound deadening chamber, the core tube including an airflow inlet and an airflow outlet, the core tube including a sound deadening slot located in the first sound deadening chamber and located upstream of the sound deadening slot in an airflow flow direction, and a standing wave hole located in the second sound deadening chamber, the sound deadening slot being in communication with the airflow passage.

As a further improved technical scheme of the utility model, the core tube is cylindrical, and the core tube comprises an inner channel which is communicated with the air flow inlet and the air flow outlet.

As a further improved technical scheme of the utility model, the cover plate is arc-shaped, and the airflow channel is C-shaped.

As a further development of the utility model, the cover plate is provided with a head welded to the core tube, the cover plate part passing through the support plate.

As a further improved technical scheme of the utility model, the sound blocking groove is formed by punching the core tube into the internal channel, and the sound blocking groove extends along the circumferential direction of the core tube.

As a further improved technical scheme of the utility model, the standing wave holes are distributed along the circumferential direction of the core tube.

As a further improved technical scheme of the utility model, the supporting plate comprises a first protruding part and a second protruding part protruding inwards, wherein the first protruding part and the second protruding part clamp the core tube.

As a further improved technical solution of the present utility model, the communication hole includes a first communication hole located above the first boss and the second boss, and a second communication hole located below the first boss and the second boss.

As a further improved technical scheme of the utility model, the silencer further comprises a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell, the air flow inlet penetrates through the first end cover, the air flow outlet penetrates through the second end cover, the first silencing cavity is positioned between the first end cover and the supporting plate, and the second silencing cavity is positioned between the supporting plate and the second end cover.

As a further improved technical scheme of the utility model, one end of the core tube is fixed to the first end cover in a flaring mode, and the other end of the core tube is fixed to the second end cover in a flaring mode.

In contrast to the prior art, the core tube assembly of the muffler of the present utility model comprises a core tube, a cover plate covering the core tube, and an air flow passage between an outer wall surface of the core tube and an inner wall surface of the cover plate, an opening of the air flow passage being in communication with the second muffling chamber, the core tube comprising a muffling hole in the first muffling chamber, a sound blocking slot in the first muffling chamber and upstream of the muffling hole in the air flow direction, and a standing wave hole in the second muffling chamber; through setting up the sound blocking groove, the amortization hole reaches the standing wave hole, can reduce the NVH level of well low frequency channel effectively.

Drawings

Fig. 1 is a schematic perspective view of a muffler of the present utility model in one embodiment.

Fig. 2 is a perspective view of the core tube assembly and support plate of fig. 1.

Fig. 3 is a schematic cross-sectional view taken along line A-A of fig. 1.

Fig. 4 is an exploded perspective view of fig. 1.

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the attached drawings, wherein features of the embodiments may be combined with each other without conflict if several embodiments exist. When the description refers to the accompanying drawings, the same numbers or symbols in different drawings indicate the same or similar elements unless otherwise indicated. What is described in the following exemplary embodiments does not represent all embodiments of the utility model, but rather is merely an example of a product consistent with the utility model as set forth in the claims of the utility model.

The terminology used in the present utility model is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present utility model. It should be understood that words such as "first," "second," and the like, used in the description and in the claims of the present utility model, do not denote any order, quantity, or importance, but rather are names used to distinguish one feature from another.

Referring to fig. 1-4, the present utility model discloses a muffler 100 comprising a housing 1, a first end cap 21, a second end cap 22, a support plate 3 located within the housing 1, and a core tube assembly 4 passing at least partially through the support plate 3.

The housing 1 comprises a first sound damping chamber 101 at one side (e.g. left side) of the support plate 3 and a second sound damping chamber 102 at the other side (e.g. right side) of the support plate 3. In the illustrated embodiment of the utility model, the first sound attenuation chamber 101 is located between the first end cap 21 and the support plate 3, and the second sound attenuation chamber 102 is located between the support plate 3 and the second end cap 22. The support plate 3 includes a communication hole 30 that communicates the first sound-deadening chamber 101 and the second sound-deadening chamber 102.

The core tube assembly 4 comprises a core tube 41, a cover plate 42 covering the core tube 41, and an air flow channel 40 between an outer wall surface of the core tube 41 and an inner wall surface of the cover plate 42. The opening 401 of the air flow passage 40 communicates with the second sound deadening chamber 102.

In the illustrated embodiment of the present utility model, the core tube 41 has a cylindrical shape, the cover plate 42 has a circular arc shape, and the air flow passage 40 has a C-shape. The cover plate 42 is provided with a head 421 welded to the core tube 41, and the cover plate 42 partially penetrates the support plate 3.

The core tube 41 includes an air flow inlet 411, an air flow outlet 412, and an inner passage 413 communicating the air flow inlet 411 and the air flow outlet 412. The first end cap 21 and the second end cap 22 are respectively fixed to both ends of the housing 1. The air inlet 411 extends through the first end cap 21 and the air outlet 412 extends through the second end cap 22. In the illustrated embodiment of the utility model, one end of the core tube 41 is secured to the first end cap 21 in a flared manner, and the other end of the core tube 41 is secured to the second end cap 22 in a flared manner.

The core pipe 41 includes a sound deadening hole 414 in the first sound deadening chamber 101, a sound deadening groove 415 in the first sound deadening chamber 101 that is located upstream of the sound deadening hole 414 in the flow direction of the air flow, and a standing wave hole 416 in the second sound deadening chamber 102, the sound deadening hole 414 communicating with the air flow passage 40. In the illustrated embodiment of the present utility model, the core tube 41 is punched into the inner passage 413 to form the sound blocking groove 415, and the sound blocking groove 415 extends in the circumferential direction of the core tube 41. The standing wave holes 416 are distributed along the circumferential direction of the core tube 41.

The support plate 3 includes a first boss 31 and a second boss 32 protruding inward, wherein the first boss 31 and the second boss 32 sandwich the core tube 41. The communication hole 30 includes a first communication hole 301 located above the first and second bosses 31, 32 and a second communication hole 302 located below the first and second bosses 31, 32.

When the air flow of the exhaust system flows into the internal passage 413 from the air inlet 411, the sound wave enters the narrow air flow passage 40 through the silencing hole 414, and the sound wave decibel value of a part of frequency bands is obviously reduced; the sound wave enters the second silencing cavity 102, and the decibel value of the sound wave of the other part of the frequency bands is obviously reduced. The sound blocking groove 415 in front of the sound deadening hole 414 can play a role of blocking flow and reduce the sound of the air flow generated when the air flow passes through the sound deadening hole 414. The standing wave hole 416 can break standing waves in a specific frequency band, so as to eliminate noise in a specific frequency band.

In comparison with the prior art, the core tube assembly 4 of the muffler 100 of the present utility model comprises a core tube 41, a cover plate 42 covering the core tube 41, and an air flow passage 40 located between an outer wall surface of the core tube 41 and an inner wall surface of the cover plate 42, an opening 401 of the air flow passage 40 being in communication with the second sound deadening chamber 102, the core tube 41 comprising a sound deadening hole 414 located in the first sound deadening chamber 101, a sound blocking groove 415 located in the first sound deadening chamber 101 and located upstream of the sound deadening hole 414 in the air flow direction, and a standing wave hole 416 located in the second sound deadening chamber 102; by providing the sound blocking groove 415, the sound deadening hole 414, and the standing wave hole 416, the NVH level of the middle and low frequency bands can be effectively reduced.

The above embodiments are only for illustrating the present utility model and not for limiting the technical solutions described in the present utility model, and it should be understood that the present utility model should be based on those skilled in the art, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present utility model without departing from the spirit and scope of the present utility model and modifications thereof should be covered by the scope of the claims of the present utility model.

Claims (10)

1. A muffler characterized by comprising a housing, a support plate located in the housing, and a core tube assembly passing at least partially through the support plate, the housing including a first sound deadening chamber located in one side of the support plate and a second sound deadening chamber located in the other side of the support plate, the support plate including a communication hole that communicates the first sound deadening chamber and the second sound deadening chamber, the core tube assembly including a core tube, a cover plate that covers the core tube, and an airflow passage located between an outer wall surface of the core tube and an inner wall surface of the cover plate, an opening of the airflow passage being in communication with the second sound deadening chamber, the core tube including an airflow inlet and an airflow outlet, the core tube including a sound deadening hole located in the first sound deadening chamber and located upstream of the sound deadening hole in an airflow direction, and a standing wave hole located in the second sound deadening chamber, the sound deadening hole being in communication with the airflow passage.

2. The muffler of claim 1, wherein: the core tube is cylindrical, and comprises an inner channel which is communicated with the air flow inlet and the air flow outlet.

3. The muffler of claim 2, wherein: the cover plate is arc-shaped, and the airflow channel is C-shaped.

4. The muffler of claim 3, wherein: the cover plate is provided with a head part welded and fixed on the core tube, and the cover plate part penetrates through the supporting plate.

5. The muffler of claim 2, wherein: the core tube is stamped into the inner channel to form the sound blocking groove, and the sound blocking groove extends along the circumferential direction of the core tube.

6. The muffler of claim 2, wherein: the standing wave holes are distributed along the circumferential direction of the core tube.

7. The muffler of claim 1, wherein: the support plate includes first and second protrusions protruding inward, wherein the first and second protrusions clamp the core tube.

8. The muffler of claim 7, wherein: the communication hole includes a first communication hole located above the first and second protruding portions and a second communication hole located below the first and second protruding portions.

9. The muffler of claim 1, wherein: the muffler also comprises a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell, the air flow inlet penetrates through the first end cover, the air flow outlet penetrates through the second end cover, the first silencing cavity is positioned between the first end cover and the supporting plate, and the second silencing cavity is positioned between the supporting plate and the second end cover.

10. The muffler of claim 9, wherein: one end of the core tube is fixed on the first end cover in a flaring mode, and the other end of the core tube is fixed on the second end cover in a flaring mode.