CN218862707U - Air inlet silencer of diesel engine - Google Patents
Air inlet silencer of diesel engine Download PDFInfo
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- CN218862707U CN218862707U CN202223040730.3U CN202223040730U CN218862707U CN 218862707 U CN218862707 U CN 218862707U CN 202223040730 U CN202223040730 U CN 202223040730U CN 218862707 U CN218862707 U CN 218862707U
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- spindle
- sound absorber
- flow guide
- diesel engine
- absorber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a diesel engine silencer that admits air, through set up fusiform water conservancy diversion acoustic absorber in first noise-abatement structure, first acoustic absorber encloses into fusiform cavity, fusiform water conservancy diversion acoustic absorber is located fusiform cavity, fusiform water conservancy diversion acoustic absorber is fixed on first acoustic absorber, form the water conservancy diversion passageway between fusiform water conservancy diversion acoustic absorber and the first acoustic absorber, fusiform water conservancy diversion acoustic absorber can enough realize realizing the water conservancy diversion effect to the air current that gets into the silencer inside, can also increase the area of contact of acoustic absorber and air current passageway, make the inhibition ability of the high frequency noise of silencer improve, set up the second noise-abatement structure that adopts the structure that resonance chamber and acoustic absorber combine to realize simultaneously, can suppress the low frequency noise through the resonance chamber, strengthen the inhibition ability of silencer to the low frequency noise, can further suppress the high frequency noise through the acoustic absorber again; the advantage can fall the noise to high frequency noise and low frequency noise simultaneously, and noise reduction effect is good, and the resistance loss is less.
Description
Technical Field
The utility model relates to an intake silencer especially relates to a diesel engine intake silencer.
Background
With the rapid development of industry and agriculture, diesel engines are widely used as power devices in the fields of engineering machinery, ships, automobiles and the like. The noise problem of the diesel engine is increasingly serious while the production efficiency is improved. Intake noise is one of the major sources of noise in diesel engines. The intake noise includes low-frequency noise generated by pressure pulsation of air in an intake pipe of the diesel engine and vortex noise generated by high-frequency air flowing through a flow section of an intake valve of the diesel engine at a high speed.
The existing air inlet silencer is usually realized by paving a sound-absorbing material on the inner wall of an expansion cavity, the main action frequency band of the sound-absorbing material is high frequency, so that only high-frequency noise can be reduced, low-frequency noise cannot be reduced, and in addition, because the contact area of air flow and the sound-absorbing material is limited by the size of the inner wall of the expansion cavity, the contact area is small, the high-frequency noise reduction effect is not high, and meanwhile, the air flow directly circulates in the expansion cavity, so that great resistance loss can be generated.
Disclosure of Invention
The utility model aims to solve the technical problem that a can make an uproar simultaneously falls to high frequency noise and low frequency noise, and the noise reduction effect is good, and the less diesel engine silencer that admits air of resistance loss.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a diesel engine air inlet silencer comprises a shell, an inlet pipeline flange, an outlet pipeline flange and a first silencing structure used for eliminating high-frequency noise, wherein an air flow channel is arranged inside the shell, a first opening communicated with the air flow channel and the outside is formed in the front side wall of the shell, a second opening communicated with the air flow channel and the outside is formed in the rear side wall of the shell, the inlet pipeline flange is installed at the first opening, the outlet pipeline flange is installed at the second opening, the first silencing structure comprises a first sound absorbing body located in the front of the air flow channel, the first sound absorbing body is laid on the inner side wall of the shell, the first sound absorbing body is made of a sound absorbing material, the first silencing structure further comprises a spindle-shaped flow guide sound absorbing body, the spindle-shaped flow guide sound absorbing body is made of the sound absorbing material, the first sound absorbing body is enclosed into a spindle-shaped cavity, the spindle-shaped flow guide sound absorbing body is located in the spindle-shaped cavity, the spindle-shaped flow guide sound absorbing body is fixed on the first sound absorbing body, the spindle-shaped flow guide sound absorbing body is combined with the second sound absorbing structure to eliminate the high-frequency noise, and the spindle-shaped sound absorbing structure is used for eliminating the low-frequency noise.
Second noise-abatement structure set up the airflow channel rear portion, second noise-abatement structure include that M runs through around cylindric casing and N annular mounting panel in proper order from the front to the back, M is more than or equal to 2 integer, N = M-1,M is the cylindric casing that runs through from the front to the back coaxial interval distribution in proper order around M, the lateral wall of the cylindric casing that runs through around M and the inside wall of shell between form annular chamber, with the cylindric casing that runs through around M from the front to the back in proper order be called 1 th cylindric casing, 2 nd cylindric casing, …, M cylindric casing, 1 st cylindric casing to N cylindric casing are respectively through one the annular mounting panel install the shell on, M cylindric casing install for the back lateral wall of shell, N annular mounting panel will annular chamber N resonant cavity, the second sound absorber has all been laid on the inside wall of the cylindric casing that runs through around every, the second sound absorber adopt the material to realize.
The front part of the spindle-shaped flow guide sound absorber is in a conical shape, a semi-spherical shape or a semi-elliptical shape, the external dimension of the spindle-shaped flow guide sound absorber gradually increases from front to back, the middle part of the spindle-shaped flow guide sound absorber is in a cylindrical shape, and the rear part of the spindle-shaped flow guide sound absorber is in a conical shape, a semi-spherical shape or a semi-elliptical shape, the external dimension of the spindle-shaped flow guide sound absorber gradually decreases from front to back.
The sound absorption material is a porous sound absorption material.
The outer shell is cylindrical, an airflow channel arranged in the outer shell is a cylindrical channel coaxial with the outer shell, the spindle-shaped cavity is coaxial with the airflow channel, and the spindle-shaped flow guide sound absorber is coaxial with the airflow channel.
Compared with the prior art, the utility model has the advantages of through set up fusiform water conservancy diversion acoustic absorber in first noise-abatement structure, fusiform water conservancy diversion acoustic absorber adopts sound absorbent to realize, first acoustic absorber encloses into fusiform cavity, fusiform water conservancy diversion acoustic absorber is located fusiform cavity, fusiform water conservancy diversion acoustic absorber is fixed on first acoustic absorber, form the water conservancy diversion passageway between fusiform water conservancy diversion acoustic absorber and the first acoustic absorber, the diesel engine air inlet silencer still includes the second noise-abatement structure that is used for eliminating low frequency noise and further eliminates high frequency noise, the second noise-abatement structure adopts the structure realization that resonance chamber and sound absorber combine, fusiform water conservancy diversion acoustic absorber can enough realize the water conservancy diversion effect to the inside air current that gets into the silencer, also can increase sound absorbent and air current passageway's area of contact, make the high frequency noise's of silencer restraining ability improve, the second noise-abatement structure combines resonance chamber and sound absorber, can restrain low frequency noise through the resonance chamber, strengthen the silencer to the restraining ability of low frequency noise, can further restrain the high frequency noise through the sound absorber, from this the utility model discloses can be simultaneously to the high frequency noise with the noise reduction of noise, and the low frequency noise reduction of noise, and noise reduction of noise effect is less, can be good, and the low frequency noise reduction of noise reduction is carried out, and the resistance is less.
Drawings
Fig. 1 is a front view of an intake silencer of a diesel engine according to the present invention;
fig. 2 is a rear view of an intake silencer of a diesel engine according to the present invention;
fig. 3 is a front-back sectional view of the intake silencer of the diesel engine according to the present invention;
fig. 4 is a cross-sectional view of the intake silencer of the diesel engine along the direction B-B in fig. 3.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows: as shown in fig. 1 to 4, a diesel engine intake silencer comprises a housing 1, an inlet pipe flange 2, an outlet pipe flange 3 and a first silencing structure for eliminating high-frequency noise, wherein an air flow channel 4 is arranged inside the housing 1, a first opening communicating the air flow channel 4 with the outside is arranged on the front side wall of the housing 1, a second opening communicating the air flow channel 4 with the outside is arranged on the rear side wall of the housing 1, the inlet pipe flange 2 is installed at the first opening, the outlet pipe flange 3 is installed at the second opening, the first silencing structure comprises a first sound absorber 5 positioned at the front part of the air flow channel 4, the first sound absorber 5 is laid on the inner side wall of the housing 1, the first sound absorber 5 is made of a sound absorbing material, the first silencing structure further comprises a spindle-shaped flow guide sound absorber 6, the spindle-shaped flow guide sound absorber 6 is made of a sound absorbing material, the spindle-shaped flow guide sound absorber 5 is enclosed into a spindle-shaped cavity, the spindle-shaped flow guide sound absorber 6 is positioned in the spindle-shaped cavity, the spindle-shaped flow guide sound absorber 6 is fixed on the spindle-shaped sound absorber 6 through a plurality of spindle-shaped flow guide sound absorbing materials, the spindle-shaped sound absorber 6, and the spindle-shaped sound absorbing structure is further used for eliminating the noise of the spindle-shaped sound absorbing structure formed by combining the spindle-shaped sound absorbing structure and the spindle-shaped sound absorbing structure combining with the spindle-shaped sound absorbing structure for eliminating the low-shaped noise of the spindle-shaped sound absorbing chamber.
Example two: the present embodiment is substantially the same as the first embodiment, except that in the present embodiment, a second sound attenuation structure is disposed at the rear of the airflow channel 4, the second sound attenuation structure includes M front and rear penetrating cylindrical shells 8 and N annular mounting plates 9,M which are integers greater than or equal to 2, N = M-1,M front and rear penetrating cylindrical shells 8 are coaxially distributed from front to rear in sequence at intervals, an annular chamber is formed between the outer side wall of the M front and rear penetrating cylindrical shells 8 and the inner side wall of the casing 1, the M front and rear penetrating cylindrical shells 8 are sequentially referred to as a 1 st cylindrical shell 8, a 2 nd cylindrical shell 8, … and an M th cylindrical shell 8 from front to rear in sequence, the 1 st cylindrical shell 8 to the N th cylindrical shell 8 are respectively mounted on the casing 1 through one annular mounting plate 9, the M th cylindrical shell 8 is mounted on the rear side wall of the casing 1, the N annular mounting plates 9 and the annular chamber is N annular mounting plates 10, a second sound absorber 11 is laid on each front and divided into front and rear inner side walls of each front and rear penetrating cylindrical shell 8, and a ring sound absorber 11 is implemented by using a second sound absorber material.
In this embodiment, the outer diameter and the inner diameter of the M front and rear penetrating cylindrical shells 8 are the same, the length is determined according to actual use requirements, and the M front and rear penetrating cylindrical shells 8 are mounted on the housing 1 through the N annular mounting plates 9, so that the operation is convenient, and the assembly process is simplified. The space between two adjacent cylindrical shells 8 communicates the inside of the cylindrical shell 8 with the resonance chamber, when air flows through the inside of the cylindrical shell 8, the air can flow into the resonance chamber from the space between two adjacent cylindrical shells 8, when the frequency of the sound wave is the same as the natural frequency of the resonance chamber, the air flow reciprocates like a piston under the action of the sound wave pressure, and partial sound energy is converted into heat energy through the friction and damping action of the side wall of the resonance chamber, so that low-frequency noise is suppressed, and the low-frequency noise reduction capability is enhanced.
Example three: the present embodiment is substantially the same as the first embodiment, except that in the present embodiment, the front part 61 of the spindle-shaped flow guide sound absorber 6 is a cone, a hemisphere or a semi-ellipse with gradually increasing external dimensions from front to back, the middle part 62 of the spindle-shaped flow guide sound absorber 6 is cylindrical, and the rear part 63 of the spindle-shaped flow guide sound absorber 6 is a cone, a hemisphere or a semi-ellipse with gradually decreasing external dimensions from front to back.
Example four: the present embodiment is substantially the same as the first embodiment, except that in the present embodiment, the sound absorbing material is a porous sound absorbing material such as glass fiber wool rock wool, slag wool, or a polyurethane material.
The utility model discloses a diesel engine intake silencer's theory of operation does: when gas enters the gas flow channel 4 from the first opening, the gas firstly enters the spindle-shaped flow guide sound absorber 6 and the first sound absorber 5 to form a flow guide channel 7, at the moment, the spindle-shaped flow guide sound absorber 6 and the first sound absorber 5 suppress high-frequency noise in the gas, when the gas flows out of the flow guide channel 7, the gas enters the cylindrical shell 8 to circulate, in the process, the gas flows into the resonance chamber 10, when the frequency of the sound wave is the same as the natural frequency of the resonance chamber 10, the gas flow reciprocates like a piston under the action of sound wave pressure, part of sound energy is converted into heat energy through the friction and damping action of the side wall of the resonance chamber 10, so that the low-frequency noise is suppressed, the low-frequency noise reduction capability is enhanced, and then the gas flows out of the silencer from the second opening and enters an air inlet pipeline of a diesel engine.
Claims (5)
1. A diesel engine air inlet silencer comprises a shell, an inlet pipeline flange, an outlet pipeline flange and a first silencing structure used for eliminating high-frequency noise, wherein an air flow channel is arranged in the shell, a first opening used for communicating the air flow channel with the outside is formed in the front side wall of the shell, a second opening used for communicating the air flow channel with the outside is formed in the rear side wall of the shell, the inlet pipeline flange is installed at the first opening, the outlet pipeline flange is installed at the second opening, the first silencing structure comprises a first sound absorber located in the front of the air flow channel, the first sound absorber is laid on the inner side wall of the shell and is made of sound absorbing materials, the diesel engine air inlet silencer is characterized in that the first silencing structure further comprises a spindle-shaped flow guide sound absorber, the spindle-shaped flow guide sound absorber is made of the sound absorbing materials, the first sound absorber is enclosed to form a spindle-shaped cavity, the spindle-shaped flow guide sound absorber is located in the spindle-shaped cavity, the spindle-shaped flow guide sound absorber is fixed on the first sound absorber, the spindle-shaped flow guide sound absorber, the second sound absorber is used for eliminating the high-frequency noise, and the second sound absorber is further combined with the spindle-shaped flow guide sound absorber.
2. The intake silencer of the diesel engine according to claim 1, wherein the second silencing structure is disposed at the rear of the airflow channel, the second silencing structure includes M front and rear penetrating cylindrical casings and N annular mounting plates, M is an integer greater than or equal to 2, N = M-1,M front and rear penetrating cylindrical casings are coaxially and sequentially distributed from front to rear at intervals, an annular chamber is formed between the outer side wall of the M front and rear penetrating cylindrical casings and the inner side wall of the casing, the M front and rear penetrating cylindrical casings are sequentially called as a 1 st cylindrical casing, a 2 nd cylindrical casing, … and an M th cylindrical casing from front to rear, the 1 st cylindrical casing to the N th cylindrical casing are respectively mounted on the casing through one of the annular mounting plates, the M th cylindrical casing is mounted on the rear side wall of the casing, the N annular mounting plates divide the annular chamber into N resonant cavities, a second sound absorber is disposed on the inner side wall of each front and rear penetrating cylindrical casing, and the second sound absorber is made of sound absorbing material.
3. The intake silencer of the diesel engine according to claim 1, wherein the front portion of the spindle-shaped flow guide sound absorber is in a shape of a cone, a hemisphere or a semi-ellipse, the outer dimension of which gradually increases from front to back, the middle portion of the spindle-shaped flow guide sound absorber is in a shape of a cylinder, and the rear portion of the spindle-shaped flow guide sound absorber is in a shape of a cone, a hemisphere or a semi-ellipse, the outer dimension of which gradually decreases from front to back.
4. The intake silencer of the diesel engine as claimed in claim 1, wherein the sound absorbing material is a porous sound absorbing material.
5. The intake silencer of the diesel engine according to claim 1, wherein the housing is cylindrical, the airflow channel disposed inside the housing is a cylindrical channel coaxial therewith, the spindle-shaped cavity is coaxial with the airflow channel, and the spindle-shaped flow guide sound absorber is coaxial with the airflow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223040730.3U CN218862707U (en) | 2022-11-15 | 2022-11-15 | Air inlet silencer of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223040730.3U CN218862707U (en) | 2022-11-15 | 2022-11-15 | Air inlet silencer of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218862707U true CN218862707U (en) | 2023-04-14 |
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ID=87370426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223040730.3U Active CN218862707U (en) | 2022-11-15 | 2022-11-15 | Air inlet silencer of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218862707U (en) |
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2022
- 2022-11-15 CN CN202223040730.3U patent/CN218862707U/en active Active
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