CN211924284U

CN211924284U - Mute variable frequency generator exhaust silencer

Info

Publication number: CN211924284U
Application number: CN202020621867.XU
Authority: CN
Inventors: 赵艳峰; 王义超; 朱波; 万青源
Original assignee: Chongqing Zongshen General Power Machine Co Ltd
Current assignee: Chongqing Zongshen General Power Machine Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-11-13
Anticipated expiration: 2030-04-23

Abstract

The utility model discloses a mute variable frequency generator exhaust silencer, which comprises an upper cover and a lower cover, wherein an air inlet conduit is arranged on the upper cover, an exhaust conduit is arranged on the lower cover, the cover closing surface of the upper cover and the lower cover is an inclined surface, a first baffle plate which is arranged in an inclined way is arranged in a cavity enclosed by the upper cover and the lower cover, and a box-shaped second baffle plate is arranged on the lower end surface of the first baffle plate; the first partition plate and the upper cover enclose a first chamber, the first partition plate and the second partition plate enclose a second chamber, and the first partition plate, the second partition plate and the lower cover enclose a third chamber; the first partition plate is provided with a cannula assembly communicated with the first chamber and the second chamber and a perforated tube assembly communicated with the second chamber and the third chamber. The utility model has the advantages of structural design is ingenious, use reliable, low cost, it can carry out the effective noise elimination of full frequency channel to low, well, high frequency noise for the exhaust backpressure of silencer is little, and power loss ratio is lower, has effectively improved the sound quality.

Description

Mute variable frequency generator exhaust silencer

Technical Field

The utility model relates to an exhaust silencer, especially a silence variable frequency generator exhaust silencer.

Background

At present, with the improvement of the material level, products driven by an engine are widely permeated into daily life and production of people, so that the product experience is more and more valued by people. The engine has various noise sources and different generating mechanisms, the exhaust noise of a common engine is 10-15 decibels higher than the noise of the whole engine except the exhaust noise, the exhaust noise is the most main noise source of the engine, and based on a noise superposition theory, the noise reduction effect is most obvious starting from the most main noise source.

Because the exhaust noise belongs to broadband noise, the low, medium and high frequencies all need to have certain noise elimination quantity to meet the requirement of noise reduction. In the prior art, noise control of an engine is limited by factors such as power loss and cost, exhaust noise becomes a main source of noise pollution, and the experience degree of a product is greatly influenced. An exhaust muffler with excellent performance is indispensable for low-noise products and is also an indispensable part of good customer experience. The existing engine silencer has the defects of large power loss, insufficient silencing quantity, large radiation noise, high cost and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a noise elimination performance is good, can effectively reduce the silence variable frequency generator exhaust silencer of exhaust noise.

The utility model aims at realizing through the technical scheme, a silence variable frequency generator exhaust silencer, including upper cover and lower cover, be provided with the inlet duct on the upper cover, be provided with the exhaust duct on the lower cover, the closing surface of upper cover and lower cover is the inclined plane, is provided with the first baffle of slope arrangement in the cavity that upper cover and lower cover enclose, end surface is provided with box-shaped second baffle under the first baffle; the first partition plate and the upper cover enclose a first chamber, the first partition plate and the second partition plate enclose a second chamber, and the first partition plate, the second partition plate and the lower cover enclose a third chamber; the first partition plate is provided with a cannula assembly communicated with the first chamber and the second chamber and a perforated tube assembly communicated with the second chamber and the third chamber.

The intubation tube assembly comprises a first inserting tube, a second inserting tube, a third inserting tube and a fourth inserting tube which are arranged on one side of the first partition plate and distributed in a rectangular mode, the upper ends of the first inserting tube, the second inserting tube, the third inserting tube and the fourth inserting tube are located in the first cavity, and the lower ends of the first inserting tube, the second inserting tube, the third inserting tube and the fourth inserting tube are located in the second cavity.

Further described, the first, second, third and fourth insertion tubes are inserted into the first and second cavities to a depth of one quarter and one half, respectively, of the depth of the corresponding cavity.

In order to improve the sound attenuation performance, the inner diameters of the first insertion pipe, the second insertion pipe, the third insertion pipe and the fourth insertion pipe are the same in pairs.

The perforated pipe assembly comprises a first perforated pipe and a third perforated pipe, wherein the first perforated pipe and the third perforated pipe are positioned in the second chamber, the upper ends of the first perforated pipe and the third perforated pipe are connected with the lower end face of the first partition plate, a second perforated pipe and a fourth perforated pipe, the upper ends of the second perforated pipe and the fourth perforated pipe penetrate through the first partition plate, and the lower ends of the second perforated pipe and the fourth perforated pipe penetrate through the second partition plate and are communicated with the third chamber; and the upper ends of the second perforated pipe and the fourth perforated pipe are respectively provided with a plug.

In order to guide the air flow, a second perforated pipe guide plate corresponding to the lower end of the second perforated pipe and a fourth perforated pipe guide plate corresponding to the lower end of the fourth perforated pipe are arranged on the lower end surface of the second partition plate.

Further described, in order to make the structure compact, the first and third perforated tubes are located within a rectangle surrounded by the first, second, third and fourth insertion tubes.

In order to buffer high-speed airflow and reduce airflow regeneration noise, an air inlet perforated sleeve is arranged on the inner wall of the upper cover, an air inlet is arranged on the outer wall of the lower portion of the air inlet guide pipe, the lower portion of the air inlet guide pipe is located in the air inlet perforated guide pipe, and an air inlet perforated sleeve plug is arranged at the end head of the lower end of the air inlet perforated sleeve.

In order to further reduce the air outlet noise, an air outlet hole is formed in the upper portion of the air outlet guide pipe, and an air outlet guide pipe plug is arranged at the end head of the upper end of the air outlet guide pipe; and a spark eliminator is arranged at the lower end of the exhaust guide pipe.

In order to further improve the noise reduction effect, the upper cover inner wall and the lower cover inner wall are both provided with an upper cover sound-absorbing cotton perforated guard plate with upper cover sound-absorbing cotton and a lower cover sound-absorbing cotton perforated guard plate with lower cover sound-absorbing cotton.

Since the technical scheme is used, the utility model has the advantages of structural design is ingenious, use reliably, low cost, adopt it to carry out full frequency channel's effective noise elimination to low, well, high frequency noise for the exhaust backpressure of silencer is little, and power loss ratio is lower, has effectively improved the sound quality.

Drawings

The drawings of the utility model are as follows:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the first separator plate;

fig. 3 is a sectional view a-a of fig. 1.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the appended claims.

Example 1: as shown in fig. 1, 2 and 3, an exhaust muffler of a silent variable frequency generator comprises an upper cover 1 and a lower cover 2, wherein an air inlet duct 3 is arranged on the upper cover 1, an exhaust duct 4 is arranged on the lower cover 2, the covering surface of the upper cover 1 and the lower cover 2 is an inclined surface, a first partition plate 5 which is obliquely arranged is arranged in a cavity enclosed by the upper cover 1 and the lower cover 2, and a box-shaped second partition plate 6 is arranged on the lower end surface of the first partition plate 5; the first partition plate 5 and the upper cover 1 enclose a first chamber 7, the first partition plate 5 and the second partition plate 6 enclose a second chamber 8, and the first partition plate 5, the second partition plate 6 and the lower cover 2 enclose a third chamber 9; a cannula assembly communicating the first chamber 7 with the second chamber 8 and a perforated tube assembly communicating the second chamber 8 with the third chamber 9 are arranged on the first partition 5.

The intubation tube assembly comprises a first insertion tube 10, a second insertion tube 11, a third insertion tube 12 and a fourth insertion tube 13 which are arranged on one side of the first partition plate 5 and distributed in a rectangular shape, the upper ends of the first insertion tube 10, the second insertion tube 11, the third insertion tube 12 and the fourth insertion tube 13 are located in the first chamber 7, and the lower ends of the first insertion tube 10, the second insertion tube 11, the third insertion tube 12 and the fourth insertion tube 13 are located in the second chamber 8.

In order to improve the sound-damping properties, the first, second, third and

fourth insertion tubes

10, 11, 12 and 13 are inserted into the first and

second chambers

7 and 8 to a depth of one quarter and one half, respectively, of the depth of the corresponding chamber.

In order to form different expansion ratios and widen the sound attenuation band, the inner diameters of the first insertion tube 10 and the second insertion tube 11, and the third insertion tube 12 and the fourth insertion tube 13 are the same two by two.

Further described, the perforated tube assembly includes a first perforated tube 14 and a third perforated tube 15 which are located in the second chamber 8 and have upper ends connected to the lower end surface of the first partition plate 5, a second perforated tube 16 and a fourth perforated tube 17 which have upper ends penetrating the first partition plate 7 are provided in the first perforated tube 14 and the third perforated tube 15, and the lower ends of the second perforated tube 16 and the fourth perforated tube 17 penetrate the second partition plate 6 and communicate with the third chamber 9; and plugs 18 are arranged at the upper ends of the second perforated pipe 16 and the fourth perforated pipe 17.

In order to guide the air flow, a second perforated tube guide plate 19 corresponding to the lower end of the second perforated tube 16 and a fourth perforated tube guide plate 20 corresponding to the lower end of the fourth perforated tube 17 are provided on the lower end surface of the second separator 6.

Further described, the first perforated tube 14 and the third perforated tube 15 are located within a rectangle enclosed by the first insertion tube 10, the second insertion tube 11, the third insertion tube 12, and the fourth insertion tube 13.

In order to buffer high-speed airflow and reduce airflow regeneration noise, an air inlet perforated sleeve 21 is arranged on the inner wall of the upper cover 1, an air inlet 22 is arranged on the outer wall of the lower part of the air inlet guide pipe 3, the lower part of the air inlet guide pipe 3 is positioned in the air inlet perforated guide pipe 21, and an air inlet perforated sleeve plug 23 is arranged at the lower end of the air inlet perforated sleeve 21.

In order to further reduce the air outlet noise, an air outlet hole 24 is arranged at the upper part of the exhaust guide pipe 4, and an exhaust guide pipe plug 25 is arranged at the upper end of the exhaust guide pipe 4; a spark arrester 26 is provided at the lower end of the exhaust pipe 4.

In order to improve the noise reduction effect, an upper cover sound absorption cotton perforated guard plate 28 with upper cover sound absorption cotton 27 and a lower cover sound absorption cotton perforated guard plate 30 with lower cover sound absorption cotton 29 are respectively arranged on the inner wall of the upper cover 1 and the inner wall of the lower cover 2. The upper cover sound absorption cotton 27 and the lower cover sound absorption cotton 29 have good sound absorption effect on high frequency, low-frequency noise can be reduced through refraction and reflection of the three cavity resistant structures, and medium and high-frequency noise can be reduced through the resistant sound absorption structures.

In the utility model, the waste gas enters the first chamber 7 through the inlet hole 22 on the inlet duct 3 and the inlet perforated casing 21, the first chamber 7 is the combination of the resonance sound absorption structure and the insert pipe expansion structure, the air speed is reduced to avoid generating air flow regeneration noise, the waste gas is rapidly expanded after throttling, the exhaust resistance is reduced, and the waste gas has certain silencing effect on middle and low frequencies; then, the mixture enters a second chamber 8 through four insertion pipes on the first partition plate 5, the inner diameters of the four insertion pipes are the same in pairs, different expansion ratios can be formed, and the silencing frequency band is widened; meanwhile, the second chamber 8 is provided with a first perforated pipe 14 and a third perforated pipe 15, which have good muffling effect on medium and high frequencies, and then enters the third chamber 9 through a second perforated pipe 16 and a fourth perforated pipe 17 between the first partition plate 5 and the second partition plate 6, and finally is discharged through a vent hole 24 on the exhaust guide pipe 4. The utility model discloses exhaust silencer all has good noise elimination effect to well low-frequency noise, can realize the noise elimination of full frequency band.

Claims

1. The utility model provides a silence variable frequency generator exhaust silencer, includes upper cover (1) and lower cover (2) be provided with air intake duct (3) on upper cover (1) be provided with exhaust duct (4), characterized by on lower cover (2): the cover closing surface of the upper cover (1) and the lower cover (2) is an inclined surface, a cavity enclosed by the upper cover (1) and the lower cover (2) is internally provided with a first partition plate (5) which is obliquely arranged, and the lower end surface of the first partition plate (5) is provided with a box-shaped second partition plate (6); the first partition plate (5) and the upper cover (1) enclose a first chamber (7), the first partition plate (5) and the second partition plate (6) enclose a second chamber (8), and the first partition plate (5), the second partition plate (6) and the lower cover (2) enclose a third chamber (9); and a cannula assembly communicating the first chamber (7) with the second chamber (8) and a perforated tube assembly communicating the second chamber (8) with the third chamber (9) are arranged on the first partition plate (5).

2. The exhaust muffler of a silent variable frequency generator as set forth in claim 1, wherein: the intubation tube assembly comprises a first inserting tube (10), a second inserting tube (11), a third inserting tube (12) and a fourth inserting tube (13) which are arranged on one side of a first partition plate (5) and distributed in a rectangular mode, the upper ends of the first inserting tube (10), the second inserting tube (11), the third inserting tube (12) and the fourth inserting tube (13) are located in a first cavity (7), and the lower ends of the first inserting tube (10), the second inserting tube (11), the third inserting tube (12) and the fourth inserting tube (13) are located in a second cavity (8).

3. The exhaust muffler of a silent variable frequency generator as set forth in claim 2, wherein: the depths of the first insertion pipe (10), the second insertion pipe (11), the third insertion pipe (12) and the fourth insertion pipe (13) inserted into the first cavity (7) and the second cavity (8) are respectively one fourth and one half of the depth of the corresponding cavities.

4. The exhaust muffler of a silent variable frequency generator as set forth in claim 3, wherein: the inner diameters of the first insertion tube (10), the second insertion tube (11), the third insertion tube (12) and the fourth insertion tube (13) are the same in pairs.

5. The exhaust muffler of a silent variable frequency generator as claimed in claim 4, wherein: the perforated pipe assembly comprises a first perforated pipe (14) and a third perforated pipe (15) which are positioned in the second chamber (8) and the upper ends of which are connected with the lower end face of the first partition plate (5), a second perforated pipe (16) and a fourth perforated pipe (17) the upper ends of which penetrate through the first partition plate (7) are arranged in the first perforated pipe (14) and the third perforated pipe (15), and the lower ends of the second perforated pipe (16) and the fourth perforated pipe (17) penetrate through the second partition plate (6) and are communicated with the third chamber (9); and plugs (18) are arranged at the upper ends of the second perforated pipe (16) and the fourth perforated pipe (17).

6. The exhaust muffler of a silent variable frequency generator as set forth in claim 5, wherein: and a second perforated pipe guide plate (19) corresponding to the lower end of the second perforated pipe (16) and a fourth perforated pipe guide plate (20) corresponding to the lower end of the fourth perforated pipe (17) are arranged on the lower end surface of the second partition plate (6).

7. The exhaust muffler of a silent frequency conversion generator as claimed in claim 6, wherein: the first perforated pipe (14) and the third perforated pipe (15) are positioned in a rectangle surrounded by the first insertion pipe (10), the second insertion pipe (11), the third insertion pipe (12) and the fourth insertion pipe (13).

8. The exhaust muffler of a silent frequency conversion generator as claimed in claim 7, wherein: an air inlet perforated sleeve (21) is arranged on the inner wall of the upper cover (1), an air inlet hole (22) is formed in the outer wall of the lower portion of the air inlet guide pipe (3), the lower portion of the air inlet guide pipe (3) is located in the air inlet perforated guide pipe (21), and an air inlet perforated sleeve plug (23) is arranged at the end head of the lower end of the air inlet perforated sleeve (21).

9. The exhaust muffler of a silent frequency conversion generator as claimed in claim 8, wherein: an exhaust hole (24) is formed in the upper part of the exhaust guide pipe (4), and an exhaust guide pipe plug (25) is arranged at the end head of the upper end of the exhaust guide pipe (4); and a spark eliminator (26) is arranged at the lower end head of the exhaust guide pipe (4).

10. The exhaust muffler of a silent variable frequency generator as set forth in claim 9, wherein: the inner wall of the upper cover (1) and the inner wall of the lower cover (2) are respectively provided with an upper cover sound-absorbing cotton perforated guard plate (28) with upper cover sound-absorbing cotton (27) and a lower cover sound-absorbing cotton perforated guard plate (30) with lower cover sound-absorbing cotton (29).