Air intake pipe integrating two sound attenuation structures

Abstract

An intake pipe integrating two silencing structures includes a pipe body formed by the joining of an upper shell and a lower shell. A first opening and a second opening are formed on the bottom wall of the lower shell. A first cylinder and a second cylinder are integrally formed on the outer bottom surface of the lower shell, corresponding to the positions of the first and second openings, respectively. The opening of the first cylinder overlaps with the first opening and forms a wavelength tube within the first cylinder. The opening of the second cylinder overlaps with the second opening, and a cover plate is provided over the second opening. A third opening is formed in the middle of the cover plate. An annular baffle is integrally formed on the bottom surface of the cover plate, corresponding to the position of the third opening. The cover plate, the annular baffle, the second cylinder, and the third opening form a holmhertz silencer. By integrating a wavelength tube and a holmhertz silencer on the intake pipe, a wider frequency band can be covered, forming a complementary effect, thereby reducing mid-to-high frequency noise and low-frequency noise within the intake pipe respectively. This invention has a simple structure and is easy to manufacture and assemble.

Description

Technical Field

[0001] This utility model relates to the air intake pipe of an air filter, specifically to an air intake pipe that integrates two noise reduction structures. Background Technology

[0002] Existing motor vehicle engine air filters are used to filter air, and the filtered clean air is sent to the engine. Air is supplied to the air filter through the intake pipe in the engine compartment. The layout of the intake pipe in the engine compartment must take into account various factors. The noise generated by the engine is transmitted through the intake system. The muffler installed in the intake pipe can eliminate or reduce these sounds and prevent them from being transmitted to the outside. Currently, the mufflers in the intake pipe are relatively simple and cannot completely eliminate these sounds. Utility Model Content

[0003] In view of the problems in the prior art, this utility model provides an intake pipe that integrates two muffler structures, with the aim of completely eliminating the sound transmitted from the engine.

[0004] An intake pipe integrating two silencer structures includes a pipe body formed by the joining of an upper shell and a lower shell. A first opening and a second opening are provided on the bottom wall of the lower shell. A first cylinder and a second cylinder are integrally provided on the outer bottom surface of the lower shell at positions corresponding to the first opening and the second opening, respectively. The opening of the first cylinder overlaps with the first opening and is combined within the first cylinder to form a wavelength tube. The opening of the second cylinder overlaps with the second opening. A cover plate is provided on the second opening. A third opening is provided in the middle of the cover plate. An annular baffle is integrally provided on the bottom surface of the cover plate at a position corresponding to the third opening. The cover plate, the annular baffle, the second cylinder, and the third opening form a Holmhertz silencer.

[0005] Furthermore, downwardly extending buckles are distributed on the bottom edge of the cover plate, and a slot is provided at the opening of the second cylinder corresponding to the buckle position, with the buckle engaging in the corresponding slot.

[0006] Furthermore, the top surface of the cover plate is flush with the inner bottom surface of the lower housing.

[0007] Furthermore, a step is provided on the bottom surface of the lower housing at the position of the inner ring of the second opening. The depth of the step is the same as the thickness at the edge of the cover plate, and the edge of the cover plate is elastic and covers the step.

[0008] Furthermore, the steps are arranged around the second opening and are C-shaped or ring-shaped.

[0009] Furthermore, the first opening is a waist-shaped hole.

[0010] Furthermore, the second opening is a square hole.

[0011] Furthermore, the wavelength tube is a 1 / 4 wavelength tube.

[0012] Furthermore, the first cylinder and the second cylinder share a common sidewall.

[0013] The beneficial effects of this utility model are: by integrating a wavelength tube and a Holmhertz silencer on the intake pipe, a wider frequency band can be covered, forming a complementary effect, thereby reducing the mid-to-high frequency noise and low-frequency noise in the intake pipe respectively; this utility model has a simple structure and is easy to produce and assemble. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an assembly effect diagram of the lower shell and cover plate in this utility model;

[0016] Figure 3 This is a schematic diagram of the lower shell structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the cover plate in this utility model. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0019] An intake pipe integrating two noise reduction structures, such as Figure 1 and Figure 2 As shown, the tube 1 is formed by connecting an upper shell 11 and a lower shell 12. The longitudinal section of the tube 1 is square. A first opening 13 and a second opening 14 are provided on the bottom wall of the lower shell 12. The first opening 13 is an oblong hole, and the second opening 14 is a square hole. The second opening 14 and the first opening 13 are arranged sequentially along the airflow direction inside the tube. A first cylinder 21 and a second cylinder 22 are integrally formed on the outer bottom surface of the lower shell 12 at positions corresponding to the first opening 13 and the second opening 14, respectively. The opening of the first cylinder 21 overlaps with the first opening 13 and forms a 1 / 4 wavelength tube inside the first cylinder 21; the opening of the second cylinder 22 overlaps with the second opening 14 and is combined with... Figure 3 and Figure 4As shown, a cover plate 3 is provided over the second opening 14, and a third opening 31 is provided in the middle of the cover plate 3. An annular baffle 32 is integrally provided on the bottom surface of the cover plate 3 corresponding to the position of the third opening 31. The inner wall of the annular baffle 32 is vertically arranged. The cover plate 3, the annular baffle 32, the second cylinder 22 and the third opening 31 together form a Holmhertz silencer. The third opening 31 serves as the neck of the Holmhertz silencer. In order to facilitate the cover plate 3 to be stably covered on the second opening 14, there are downwardly extending buckles 33 distributed on the bottom edge of the cover plate 3. A slot 221 is provided at the opening of the second cylinder 22 corresponding to the position of the buckle 33. The buckle 33 is engaged in the corresponding slot 221.

[0020] To prevent airflow turbulence at the cover plate 3, the top surface of the cover plate 3 is flush with the inner bottom surface of the lower housing 12. To improve the stability of the cover plate 3 at the second opening 14, a step 141 is provided on the bottom surface of the lower housing 12 at the inner circle of the second opening 14. The depth of the step 141 is the same as the thickness at the edge of the cover plate 3. The edge of the cover plate 3 is elastic and covers the step 141. The step 141 is arranged around the second opening 14 in a C-shape or ring shape.

[0021] In addition, to improve the compactness of the first cylinder 21 and the second cylinder 22, the first cylinder 21 and the second cylinder 22 share a side wall.

[0022] In use, one end of the tube 1 is connected to the horn-shaped air inlet, and the other end is connected to the air inlet of the air filter. The Holmhertz silencer is effective against low-frequency noise through the resonance of the annular baffle 32 and the inner cavity of the second cylinder 22. The 1 / 4 wavelength tube cancels out specific frequencies through sound wave reflection, which is effective against mid-to-high frequency noise, thus forming a complementary effect and achieving complete elimination of intake pipe noise.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An intake pipe integrating two silencer structures, comprising a pipe body formed by the joining of an upper shell and a lower shell, characterized in that: A first opening and a second opening are provided on the bottom wall of the lower shell. A first cylinder and a second cylinder are integrally formed on the outer bottom surface of the lower shell at the positions corresponding to the first opening and the second opening, respectively. The opening of the first cylinder overlaps with the first opening and forms a wavelength tube within the first cylinder. The opening of the second cylinder overlaps with the second opening. A cover plate is provided on the second opening. A third opening is provided in the middle of the cover plate. An annular baffle is integrally formed on the bottom surface of the cover plate at the position corresponding to the third opening. The cover plate, the annular baffle, the second cylinder, and the third opening form a Holmhertz silencer.

2. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The bottom edge of the cover plate has downward-extending buckles, and the opening of the second cylinder has a corresponding buckle slot, which is engaged with the buckle in the corresponding slot.

3. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The top surface of the cover plate is flush with the inner bottom surface of the lower housing.

4. The intake pipe integrating two silencer structures according to claim 3, characterized in that: A step is provided on the bottom surface of the lower housing at the position of the inner ring of the second opening. The depth of the step is the same as the thickness at the edge of the cover plate. The edge of the cover plate is elastic and covers the step.

5. The intake pipe integrating two noise reduction structures according to claim 4, characterized in that: The steps are arranged around the second opening and are C-shaped or ring-shaped.

6. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The first opening is a waist-shaped hole.

7. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The second opening is a square hole.

8. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The wavelength tube is a 1 / 4 wavelength tube.

9. The intake pipe integrating two silencer structures according to claim 1, characterized in that: The first and second cylinders share a common sidewall.

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