Noise reduction air pipe structure integrally formed by injection and blowing
By using an injection-blown one-piece molded muffler air pipe structure, the problems of complicated muffler installation and limited space in PHEV models have been solved, achieving efficient connection and compact design, and improving production efficiency and muffler effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-11
- Publication Date
- 2026-04-10
AI Technical Summary
Existing mufflers are cumbersome to install in PHEV models due to space constraints, making efficient connection difficult and affecting production efficiency and space utilization.
The silencer air pipe adopts an injection-blown one-piece molding structure. The silencer core and the pipe body are integrally molded and a stable connection is achieved by using structures such as limiting grooves, positioning protrusions and inclined surfaces. The silencer core and the pipe body are made of the same material and bonded with a low melting point material. The silencer shell is welded to the surface of the core.
It improves production efficiency, reduces space occupation, achieves a compact structural design, and enhances noise reduction performance.
Smart Images
Figure CN224107344U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of automobile intake system, especially related to a blow -molding sound -attenuating air pipe structure of injection. BACKGROUND
[0002] Under the background of global active practice of emission reduction target and market continuous adaptation to new energy revolution, PHEV (plug-in hybrid electric vehicle) model is rapidly emerging in the automobile market and realizing popularization and rapid development with its efficient power system technology, PHEV model skillfully combines the advantages of fuel power and electric drive, retains the endurance guarantee of long-distance driving of traditional fuel vehicles, has the characteristics of environmental protection, quietness and rapid power response of electric vehicles, and has remarkable effect in reducing energy consumption and reducing exhaust emission. However, in the process of pursuing performance and efficiency improvement, PHEV model also faces some technical problems, because it adopts the design of fuel and electric double system integration, which further compresses the limited space, and in such a small space, the sound attenuation structure of the intake system faces unprecedented great challenge.
[0003] At present, the existing silencer usually adopts the process of assembling and welding after single body forming of each part, and then realizes clamping with the pipe body by using the clamp, in the clamp installation process, appropriate tools and certain operation skills are needed, the installer must accurately control the fastening degree of the clamp, the whole connection process is time-consuming and the operation process is relatively complicated, which undoubtedly greatly reduces the production efficiency, in addition, more importantly, the connection of the two ends of the silencer and the pipe body through the clamp has certain requirements for the straight line distance required for installation, in the actual application scene, due to the limitation of installation space, the structure of the silencer is difficult to realize. UTILITY MODEL CONTENTS
[0004] The utility model aims at the above problems existing in the prior art, and provides a blow -molding sound -attenuating air pipe structure of injection.
[0005] The above technical purpose of the utility model can be realized by the following technical scheme: a blow -molding sound -attenuating air pipe structure of injection, which comprises a silencer core, a silencer shell and a pipe body, the pipe body is provided with a limiting groove, the silencer core is sleeved on the outer side of the pipe body and located in the limiting groove, the limiting groove is used for limiting the silencer core, the outer side wall of the pipe body is provided with a positioning protrusion, the silencer core is provided with a positioning hole matched with the positioning protrusion, the positioning protrusion is inserted into the positioning hole, and the silencer shell is connected with the silencer core.
[0006] In the injection-blowing integrated sound-damping air pipe structure, the annular protrusion one of the sound-damper core body has an outer side wall provided with an inclined surface one, and the inner side wall of the annular protrusion two is provided with an inclined surface two, and the inclined surface one is matched with the inclined surface two.
[0007] In the injection-blowing integrated sound-damping air pipe structure, the annular protrusion one of the sound-damper core body has an outer side wall provided with an inclined surface one, and the inner side wall of the annular protrusion two is provided with an inclined surface two, and the inclined surface one is matched with the inclined surface two.
[0008] In the injection-blowing integrated sound-damping air pipe structure, the sound-damper shell comprises a sound-damper shell one and a sound-damper shell two, the sound-damper shell one is welded on the outer surface of the sound-damper core body, the sound-damper shell two is welded on the outer surface of the sound-damper core body, and the sound-damper shell one and the sound-damper shell two are oppositely arranged.
[0009] In the injection-blowing integrated sound-damping air pipe structure, the sound-damper core body is provided with a sound-damping through hole one, and the pipe body is provided with a sound-damping through hole two corresponding to the sound-damping through hole one.
[0010] In the injection-blowing integrated sound-damping air pipe structure, the sound-damper core body is bonded with the pipe body.
[0011] In the injection-blowing integrated sound-damping air pipe structure, the sound-damper core body and the pipe body are made of the same material.
[0012] In the injection-blowing integrated sound-damping air pipe structure, the melting point of the material of the sound-damper core body is lower than the melting point of the material of the pipe body.
[0013] In the injection-blowing integrated sound-damping air pipe structure, the inner side wall of the pipe body is provided with a plurality of sound-damping cavities.
[0014] In the injection-blowing integrated sound-damping air pipe structure, the sound-damper core body is provided with a sound-damping cotton layer on the outer surface of the sound-damper shell and the inner surface of the sound-damper core body.
[0015] In summary, the beneficial effects of the present application compared with the prior art are:
[0016] During production, the muffler core is pre-placed in a blow molding mold, and then the tube is blow-molded. The blow-molded tube passes directly through the muffler core, meaning the muffler core is fitted onto the outside of the tube and located within the tube's limiting groove. The positioning protrusions on the outer wall of the tube are inserted into the positioning holes on the muffler core. After the tube is blow-molded, the tube and the muffler core remain relatively stable. This eliminates the need for connectors and avoids the time and effort required to maintain relative stability between the muffler core and the tube, effectively improving production efficiency and making the overall structure more compact, thus reducing space occupation. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of an embodiment;
[0018] Figure 2 This is a partial structural schematic diagram of an embodiment;
[0019] Figure 3 This is a partial cross-sectional view of an embodiment;
[0020] Figure 4 for Figure 3 Enlarged view of part A;
[0021] Figure 5 This is a schematic diagram of the muffler core and muffler housing in an embodiment.
[0022] Reference numerals in the attached drawings: 1. Muffler core; 2. Tube body; 3. Muffler outer shell; 31. Muffler shell one; 32. Muffler shell two; 4. Limiting groove; 5. Positioning protrusion; 6. Positioning hole; 7. Annular protrusion one; 8. Annular protrusion two; 9. Inclined surface one; 10. Inclined surface two; 11. Muffler through hole one; 12. Muffler through hole two; 13. Muffler cavity. Detailed Implementation
[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0024] A one-piece injection-molded silencer air pipe structure, such as Figures 1 to 5 As shown, it includes a muffler core 1, a muffler housing 3, and a tube 2.
[0025] The muffler housing 3 is connected to the muffler core 1. Specifically, in this embodiment, the muffler housing 3 includes a muffler housing 1 31 and a muffler housing 2 32. The muffler housing 1 31 is welded to the outer surface of the muffler core 1, and the muffler housing 2 32 is welded to the outer surface of the muffler core 1. The muffler housing 1 31 and the muffler housing 2 32 are arranged opposite to each other.
[0026] The muffler core 1 is provided with a sound attenuation hole one 11, and the pipe body 2 is provided with a sound attenuation hole two 12 corresponding to the sound attenuation hole one 11. The gas flowing in the pipe can enter the cavity between the muffler core 1 and the muffler shell 3 through the sound attenuation hole one 11 and the sound attenuation hole two 12 in turn. Firstly, the sound wave will interfere, reflect and scatter in the sound attenuation hole one 11 and the sound attenuation hole two 12. When the sound waves of different frequencies pass through, part of the sound waves will cancel each other out due to opposite phases, thereby reducing the sound wave energy. At the same time, the cavity formed by the sound attenuation hole one 11, the sound attenuation hole two 12, the muffler core 1 and the muffler shell 3 forms a resonance structure. When the frequency of the sound wave matches the natural frequency of the resonance structure, resonance will be triggered, thereby further consuming sound energy and achieving the purpose of sound attenuation.
[0027] It should be noted that the sound attenuation hole one 11 and the sound attenuation hole two 12 correspond to each other. The diameter and number of the sound attenuation hole one 11 and the sound attenuation hole two 12 can be changed according to the sound attenuation requirement, which is not limited here.
[0028] The pipe body 2 is provided with a limiting groove 4, and the muffler core 1 is sleeved outside the pipe body 2 and located in the limiting groove 4. The limiting groove 4 is used for limiting the muffler core 1. The outer wall of the pipe body 2 is provided with a positioning protrusion 5, and the muffler core 1 is provided with a positioning hole 6 matched with the positioning protrusion 5. The positioning protrusion 5 is inserted into the positioning hole 6. That is, the muffler core 1 is further limited by the cooperation of the limiting groove 4 and the positioning hole 6 and the positioning protrusion 5, so that the pipe body 2 and the muffler core 1 remain relatively stable.
[0029] The muffler core 1 is provided with an annular protrusion one 7 at both ends, and the pipe body 2 is provided with an annular protrusion two 8 corresponding to the annular protrusion one 7. The annular protrusion two 8 presses the annular protrusion one 7. The outer wall of the annular protrusion one 7 is provided with an inclined surface one 9, and the inner wall of the annular protrusion two 8 is provided with an inclined surface two 10. The inclined surface one 9 and the inclined surface two 10 are matched to further limit the muffler core 1 and ensure that the muffler core 1 and the pipe body 2 remain relatively stable.
[0030] It should be noted that in the production and manufacturing process, the muffler core 1 is first pre-installed in the blow molding mold, and then the pipe body 2 is blow molded. The blow molded pipe body 2 directly passes through the muffler core 1. That is, the muffler core 1 is sleeved outside the pipe body 2 and located in the limiting groove 4 of the pipe body 2. The positioning protrusion 5 of the outer wall of the pipe body 2 is inserted into the positioning hole 6 of the muffler core 1. The annular protrusion two 8 of the pipe body 2 presses the annular protrusion one 7 of the muffler core 1. Finally, the muffler shell one 31 and the muffler shell two 32 are welded on the outer surface of the muffler core 1.
[0031] It should be noted that in the present embodiment, the silencer core 1 and the pipe body 2 are made of the same material, so that the pipe body 2 is blow molded and adhered to the silencer core 1, thereby further ensuring the relative stability of the silencer core 1 and the pipe body 2.
[0032] As another solution, the melting point of the material used for the silencer core 1 is lower than that of the material used for the pipe body 2, which helps the pipe body 2 to be blow molded and adhered to the silencer core 1.
[0033] Compared with the prior art in which the clamp is used to connect the silencer and the pipe body 2, in the present embodiment, the silencer core 1 is pre-installed in the blow molding mold, and then the pipe body 2 is blow molded and adhered to the silencer core 1, so that the silencer core 1 and the pipe body 2 can be kept relatively stable without the need for connecting parts and a large amount of time and effort, which can effectively improve the production efficiency, and make the overall structure more compact, effectively reducing the space occupation, and more suitable for narrow space environment.
[0034] The inner side wall of the pipe body 2 is provided with a plurality of sound absorbing cavities 13, when the sound wave enters the pipe body 2 and propagates to the sound absorbing cavities 13, part of the sound wave will be reflected on the inner surface of the sound absorbing cavities 13, the reflected sound wave meets the sound wave propagating forward and interferes with each other, thereby canceling each other, and then reducing the intensity of the sound.
[0035] As another solution, further, the silencer core 1 is provided with a sound absorbing cotton layer (not shown) on the outer surface of the silencer shell 3 and the inner surface of the silencer shell 3 relative to the silencer core 1, which reduces the intensity of the noise and improves the overall sound absorbing performance.
[0036] The specific embodiments described herein are merely illustrative of the present application; those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.
Claims
1. A sound-attenuating air duct structure of injection blow integrated molding, characterized by: The muffler comprises a muffler core (1), a muffler shell (3) and a pipe body (2), the pipe body (2) is provided with a limiting groove (4), the muffler core (1) is sleeved outside the pipe body (2) and located in the limiting groove (4), the limiting groove (4) is used for limiting the muffler core (1), the outer wall of the pipe body (2) is provided with a positioning protrusion (5), the muffler core (1) is provided with a positioning hole (6) matched with the positioning protrusion (5), the positioning protrusion (5) is inserted into the positioning hole (6), and the muffler shell (3) is connected with the muffler core (1).
2. The integrally injection-blow molded sound attenuating air tube structure of claim 1, wherein: The muffler core (1) is provided with an annular protrusion one (7) at two ends, the pipe body (2) is provided with an annular protrusion two (8) corresponding to the annular protrusion one (7), and the annular protrusion two (8) is used for pressing the annular protrusion one (7).
3. The integrally injection-blow molded sound attenuating air tube structure of claim 2, wherein: The outer wall of the annular protrusion one (7) is provided with an inclined surface one (9), the inner wall of the annular protrusion two (8) is provided with an inclined surface two (10), and the inclined surface one (9) is matched with the inclined surface two (10).
4. The integrally injection-blow molded sound attenuating air tube structure of any one of claims 1, 2 or 3, wherein: The muffler shell (3) comprises a muffler shell one (31) and a muffler shell two (32), the muffler shell one (31) is welded to the outer surface of the muffler core (1), the muffler shell two (32) is welded to the outer surface of the muffler core (1), and the muffler shell one (31) is arranged opposite to the muffler shell two (32).
5. The integrally injection-blow molded sound attenuating air tube structure of any one of claims 1, 2 or 3, wherein: The muffler core (1) is provided with a sound reduction through hole one (11), and the pipe body (2) is provided with a sound reduction through hole two (12) corresponding to the sound reduction through hole one (11).
6. The integrally injection-blow molded sound attenuating air tube structure of any one of claims 1, 2 or 3, wherein: The muffler core (1) is bonded to the pipe body (2).
7. The integrally injection-blow molded sound attenuating air tube structure of claim 6, wherein: The muffler core (1) and the pipe body (2) are made of the same material.
8. The integrally injection-blow molded sound attenuating air tube structure of claim 6, wherein: The melting point of the material of the muffler core (1) is lower than that of the pipe body (2).
9. The integrally injection-blow molded sound attenuating air tube structure of any one of claims 1, 2 or 3, wherein: The inner wall of the pipe body (2) is provided with a plurality of sound reduction cavities (13).
10. The integrally injection-blow molded sound attenuating air tube structure of any one of claims 1, 2 or 3, wherein: The muffler core (1) is provided with a sound reduction cotton layer on the outer surface of the muffler shell (3) and the inner surface of the muffler shell (3) relative to the muffler core (1).