CN207634217U - Intake muffler and diesel fork lift truck - Google Patents
Intake muffler and diesel fork lift truck Download PDFInfo
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- CN207634217U CN207634217U CN201721219641.1U CN201721219641U CN207634217U CN 207634217 U CN207634217 U CN 207634217U CN 201721219641 U CN201721219641 U CN 201721219641U CN 207634217 U CN207634217 U CN 207634217U
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- cavity
- expansion
- insertion tube
- intake muffler
- resonant cavity
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Abstract
The utility model is related to a kind of intake muffler and diesel fork lift trucks.The purpose of this utility model is to provide a kind of intake muffler and diesel fork lift truck simple in structure, easy for installation, to reduce the medium-high frequency section of gas handling system and the noise of special frequency channel, reduces influence of the induction noise to vehicle.The technical solution of the utility model is：A kind of intake muffler, it is characterised in that：With expansion cavity and resonant cavity, wherein expansion cavity is equipped with the air inlet insertion tube and outlet insertion tube for being connected to its interior expansion chamber；The resonant cavity is connected on expansion cavity and is set the partition board separation in the two connecting place, which is equipped with several apertures, and the expansion cavity in the expansion cavity body is connected to the resonant cavity in resonant cavity through the aperture on partition board.The utility model is suitable for diesel fork lift truck silencer technical field.
Description
Technical field
The utility model is related to a kind of intake muffler and diesel fork lift truck, it is especially a kind of for small tonnage diesel fork lift truck into
The intake muffler of gas system specific frequency noise.Suitable for diesel fork lift truck silencer technical field.
Background technology
Intake system noise is one of main noise source of vehicle noise, is affected to the NVH performances of vehicle, noise
Air inlet air-breathing generates mainly in engine working process, in addition the turning between admission line and air inlet air filter is excessive,
And admission line and air inlet air filter itself rigidity and intrinsic frequency it is relatively low cause to resonate, and the radiation for generating medium-high frequency section is made an uproar
Sound.But some specific peaks frequency bands that original general intake muffler and air filter cannot be directed in noise are eliminated the noise.
Invention content
The technical problems to be solved in the utility model is：For above-mentioned there are problem, a kind of simple in structure, installation side is provided
Just intake muffler and diesel fork lift truck reduce air inlet and make an uproar to reduce the medium-high frequency section of gas handling system and the noise of special frequency channel
Influence of the sound to vehicle.
Technical solution used by the utility model is：A kind of intake muffler, it is characterised in that：With expansion cavity and
Resonant cavity, wherein expansion cavity is equipped with the air inlet insertion tube and outlet insertion tube for being connected to its interior expansion chamber；The resonance
Cavity is connected on expansion cavity and is set the partition board separation in the two connecting place, which is equipped with several apertures, the expansion
The expansion cavity opened in cavity is connected to the resonant cavity in resonant cavity through the aperture on partition board.
The aperture of the hole count of aperture and aperture is designed according to the peak value frequency range in intake system noise on the partition board,
Physical relationship is as follows：
In formula：C is the velocity of sound；
V is resonant cavity volume；
G is conductivity；
In formula：N is the hole count of aperture on partition board；
D is the aperture of aperture on partition board；
T is the thickness of partition board.
The resonant cavity side is close to be equipped with the jack for inserting the partition board with the expansion cavity connecting pin.
The length that the air inlet insertion tube is inserted into expansion cavity is expand cavity length 1/4.
The length that the outlet insertion tube is inserted into expansion cavity is expand cavity length 1/2.
The air inlet insertion tube and outlet insertion tube are respectively arranged at the both ends in expansion cavity length direction.
The air inlet insertion tube and outlet insertion tube are coaxially arranged.
The resonant cavity is installed in by card slot on the expansion cavity.
A kind of diesel fork lift truck, it is characterised in that：It is installed between the air inlet Outer Tube and air inlet air filter of diesel fork lift truck
The intake muffler stated.
The utility model has the beneficial effects that：Expansion cavity and resonant cavity are combined into one by intake muffler in the utility model
Body ensure that silencer has the effect of eliminating the noise in wider frequency range.In the utility model expansion cavity and resonant cavity by
Narrow meshed partition board separates, and dismounting can be freely combined in partition board and resonant cavity, according to the peak value frequency range in intake system noise
Clapboard aperture and hole count are matched with resonant cavity, using the characteristic of special spacers and RESONANT CAVITY MUFFLER, to small tonnage
Some specific peaks frequency ranges of diesel fork lift truck intake system noise are eliminated the noise, and to reduce the noise of vehicle, improve vehicle
NVH performances.The utility model intake muffler contour structures are simple, easy for installation, can preferably utilize space.
Description of the drawings
Fig. 1 is the explosive view of intake muffler in embodiment.
Fig. 2 is the sectional view of intake muffler in embodiment.
Fig. 3 be in embodiment intake muffler and original-pack intake muffler be mounted on small tonnage diesel fork lift truck it is entire into
Gas system transmits loss figure.
Specific implementation mode
Intake muffler is installed between the air inlet Outer Tube and air inlet air filter of small tonnage diesel fork lift truck in the present embodiment.
Intake muffler is made of expansion cavity silencer and RESONANT CAVITY MUFFLER in the present embodiment in this example, for reducing gas handling system
The noise of medium-high frequency section and specific peaks frequency range.
As shown in Figure 1 and Figure 2, expansion cavity silencer includes expansion cavity 3 and air inlet insertion tube 2 and goes out in the present embodiment
Gas insertion tube 1.Wherein air inlet insertion tube 2 and outlet insertion tube 1 be respectively arranged at expansion 3 length direction of cavity both ends, and into
Gas insertion tube 2 and outlet insertion tube 1 are coaxially arranged.The length that air inlet insertion tube 2 is inserted into expansion cavity 3 in this example is expansion cavity
The 1/4 of 3 length, the even-multiple to eliminate 1/2 wavelength pass through frequency；The length that outlet insertion tube 1 is inserted into expansion cavity 3 is expansion
The 1/2 of 3 length of cavity, the odd-multiple to eliminate 1/2 wavelength pass through frequency.In the present embodiment air inlet is corresponded on expansion cavity 3
Gap is provided with connector I between insertion tube 2 and air inlet insertion tube 2 and outlet insertion tube 1, and a circle card slot is equipped with around connector I.
RESONANT CAVITY MUFFLER includes resonant cavity 4 and is provided with the partition board 5 of several apertures 51 thereon in the present embodiment, wherein total
It shakes and is provided with connector II compatible with I size of connector on expansion cavity 3 on cavity 4, a circle energy is equipped with around connector II
Coordinate the strip for realizing that resonant cavity 4 is connect with expansion cavity 3 with I surrounding card slot of connector.This example is leaned in 4 side of resonant cavity
Nearly II end of connector offers flat jack 41, and partition board 5 can be inserted in jack 41.
Intake muffler is divided into upper layer and lower layer in this example, and upper layer is resonant cavity 4, and lower layer is expansion cavity 3, resonant cavity
4 are installed in by card slot on expansion cavity 3, and it is envelope to ensure the intake muffler in addition to air inlet insertion tube 2 and outlet insertion tube 1
Closed state.Resonant cavity 4 and expansion cavity 3 make the resonant cavity in resonant cavity 4 and expansion cavity by connector II and connector I
Expansion cavity connection in body 3；In the jack 41 of 4 side of resonant cavity after inserting partition board, the partition board is by resonant cavity and expansion cavity
Separate, resonant cavity is only connected to by the aperture 51 on partition board with expansion cavity.
The pore size of aperture 51 and hole count are designed according to the peak value frequency range of intake system noise on partition board 5 in this example
Selection, it is specific as follows shown to achieve the purpose that reduce gas handling system specific peaks band noise：
The frequency of noise elimination of RESONANT CAVITY MUFFLER is shown in formula：
In formula：C is the velocity of sound；
V is resonant cavity volume；
G is conductivity, is a physical quantity as unit of length.
Conductivity G is shown in formula：
In formula：N is hole count；
D is aperture；
T is the thickness of Perforated clapboard.
From above formula it is found that under specific intake system noise peak value frequency range and resonant cavity volume, it may be determined that conductivity
G, and according to the calculation formula of conductivity G, the design and selection in aperture and hole count are carried out, the two is to be mutually related.It is setting
When meter and selection, using the complexity of larger punching rate and processing technology as foundation.
The noise-cancelling theory of the present embodiment is：By the pipeline section for expanding cavity 3, air inlet insertion tube 2 and outlet insertion tube 1
Mutation, in addition upper layer connects a resonant cavity 4 and the partition board 5 of punching so that sound draws in silencer in communication process
It plays the change of impedance and generates the reflection of acoustic energy, decaying, to reduce the noise of gas handling system.
The characteristics of this example is according to the air inlet Outer Tube and air inlet air filter and engine of certain small tonnage diesel fork lift truck, design
1 kind of hole count and aperture have been made as the partition board 5 of 49x2mm.To intake muffler that this hole count and aperture are 49x2mm partition boards with
The entire gas handling system that original-pack intake muffler is mounted on small tonnage internal combustion vehicle has carried out CAE acoustics finite element simulations, the two
Transmission loss correlation curve it is as shown in Fig. 3.
The important parameter of intake muffler is aperture and the hole count of partition board in the present embodiment, should be made an uproar according to vehicle gas handling system
The peak value frequency range of sound is reasonably designed, and the resonant frequency and contour structures that consider air inlet Outer Tube and air inlet air filter are also needed.
It, need to be according to the space of entire gas handling system to intake muffler shape because the space inside small tonnage hood of internal-combustion forklift is limited
Structure carries out reasonable Arrangement.
Intake muffler is relatively simple on contour structures in this example, easy for installation, can preferably utilize space, and should
Expansion cavity and resonant cavity are combined as a whole by novel gas inlet silencer, ensure that the silencer has in wider frequency range
The effect of noise elimination, and dismounting can be freely combined in the partition board of the intake muffler and resonant cavity, according to intake system noise
In peak value frequency range clapboard aperture and hole count are matched with resonant cavity, utilize the spy of special spacers and RESONANT CAVITY MUFFLER
Property, it eliminates the noise to some specific peaks frequency ranges of small tonnage diesel fork lift truck intake system noise, to reduce the noise of vehicle,
Improve the NVH performances of vehicle.
Certainly, above description is not limitation of the utility model, and the utility model is also not limited to the example above, this skill
The those of ordinary skill in art field, in the scope of the utility model, variation, addition or the replacement made should all belong to this reality
With novel protection domain.
Claims (8)
1. a kind of intake muffler, it is characterised in that：With expansion cavity (3) and resonant cavity (4), wherein expansion cavity (3)
It is equipped with the air inlet insertion tube (2) and outlet insertion tube (1) for being connected to its interior expansion chamber；The resonant cavity (4) is connected to expansion
On cavity (3) and it is set partition board (5) separation in the two connecting place, which is equipped with several apertures (51), the expansion
Expansion cavity in cavity (3) is connected to the resonant cavity in resonant cavity (4) through the aperture (51) on partition board (5).
2. intake muffler according to claim 1, it is characterised in that：Resonant cavity (4) side it is close with it is described
It expands cavity (3) connecting pin and is equipped with the jack (41) for inserting the partition board (5).
3. intake muffler according to claim 1, it is characterised in that：The air inlet insertion tube (2) is inserted into expansion cavity
(3) length is expand cavity (3) length 1/4.
4. intake muffler according to claim 1 or 3, it is characterised in that：The outlet insertion tube (1) is inserted into expansion cavity
The length of body (3) is expand cavity (3) length 1/2.
5. intake muffler according to claim 4, it is characterised in that：The air inlet insertion tube (2) and outlet insertion tube
(1) both ends of expansion cavity (3) length direction are respectively arranged at.
6. intake muffler according to claim 5, it is characterised in that：The air inlet insertion tube (2) and outlet insertion tube
(1) coaxially arranged.
7. intake muffler according to claim 1, it is characterised in that：The resonant cavity (4) is installed in by card slot
On the expansion cavity (3).
8. a kind of diesel fork lift truck, it is characterised in that：It installs and has the right between the air inlet Outer Tube and air inlet air filter of diesel fork lift truck
It is required that the intake muffler described in 1~7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219641.1U CN207634217U (en) | 2017-09-22 | 2017-09-22 | Intake muffler and diesel fork lift truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219641.1U CN207634217U (en) | 2017-09-22 | 2017-09-22 | Intake muffler and diesel fork lift truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207634217U true CN207634217U (en) | 2018-07-20 |
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ID=62858196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721219641.1U Active CN207634217U (en) | 2017-09-22 | 2017-09-22 | Intake muffler and diesel fork lift truck |
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| Country | Link |
|---|---|
| CN (1) | CN207634217U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107587960A (en) * | 2017-09-22 | 2018-01-16 | 杭叉集团股份有限公司 | Intake muffler and diesel fork lift truck |
-
2017
- 2017-09-22 CN CN201721219641.1U patent/CN207634217U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107587960A (en) * | 2017-09-22 | 2018-01-16 | 杭叉集团股份有限公司 | Intake muffler and diesel fork lift truck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xiang Shufeng Inventor after: Shen Suyi Inventor after: Li Minghui Inventor after: Chen Xiangyu Inventor after: Shen Xiaoqing Inventor before: Xiang Shufeng Inventor before: Shen Suyi Inventor before: Li Minghui Inventor before: Chen Xiang Inventor before: Shen Xiaoqing |
|
| CB03 | Change of inventor or designer information |