Air filter inner insertion pipe

Abstract

The utility model discloses an air filter inner inserting pipe which comprises a tubular body used for an air filter, the air filter comprises an upper shell and a lower shell which are connected with each other, and air outlet cavities are formed in the upper shell and the lower shell. The body is provided with an air inlet end and an air outlet end, the body is in a bent pipe shape, the air outlet end is used for being connected with an air outlet of the air filter, and the air inlet end is used for communicating with the middle of an air outlet cavity of the air filter. The air inlet end section of the body is an inclined plane. The air filter can slow down the flow speed of air flow, reduce resistance loss of the air flow, eliminate cavity noise generated by local vortex of the air filter, improve the noise reduction effect, improve the NVH performance of the whole vehicle, guide the air flow, and improve the filtering uniformity and the utilization rate of the surface of the filter element.

Description

Technical Field

[0001] The utility model relates to the technical field of motor vehicle air filters, in particular to an air filter noise reduction technology. Background Art

[0002] The intake system of a motor vehicle engine generates intake noise during operation, and providing an inner insert pipe in the housing of the air filter is a commonly used noise reduction technology.

[0003] The existing inner insert tube is in the shape of a straight tube section, and some inner insert tubes have small holes on the tube wall. Many inner insert tubes are not in series with the main passage of the airflow, but are inserted in the main passage of the airflow. Both ends of the existing inner insert tube are in the shape of a plane cutout.

[0004] The design goal of the present invention is to improve the noise reduction effect and reduce the airflow resistance. The technical means adopted are mainly:

[0005] The inner tube is connected in series on the air flow path and is designed as a curved tube. The inlet end section is an inclined surface (not perpendicular to the inlet end axis). The inclined section reduces the reflection of sound waves on the inlet end surface, disperses the sound wave energy, and reduces standing waves. Utility Model Content

[0006] The utility model aims to provide an air filter inner insert pipe, which improves the noise reduction effect through an inclined air intake end section.

[0007] To achieve the above purpose, the utility model provides an air filter inner insert tube comprising a tubular body for an air filter, wherein the air filter comprises an upper shell and a lower shell connected to each other, wherein an air outlet cavity is provided in the upper shell and the lower shell; the body has an air inlet end and an air outlet end,

[0008] The main body is in the shape of a curved tube, the air outlet end is used to connect to the air outlet of the air filter, and the air inlet end is used to connect to the middle part of the air outlet cavity of the air filter; the air inlet end section of the main body is an inclined surface.

[0009] The air inlet end is connected to a connecting seat, and the connecting seat is provided with screw holes, and the screw holes are used to connect the upper shell of the air filter by screws;

[0010] The middle part of the body is provided with two clamping support plates for clamping and supporting on the upper shell of the air filter, and a clamping groove is formed between the two clamping support plates, and the clamping groove is used for clamping with the clamping convex strip on the upper shell of the air filter.

[0011] A flat docking plate is radially extended from the air outlet of the body, and the flat docking plate is used to be connected with the air outlet of the air filter; a convex ridge is provided on the top of the flat docking plate, and the convex ridge is used to be embedded in the positioning groove above the air outlet of the air filter.

[0012] The utility model has the following advantages:

[0013] Based on the following principles, the inlet end section of the air filter inner tube is an inclined surface to improve the noise reduction effect:

[0014] 1. The inclined section changes the propagation path of the sound wave, causing part of the sound wave to be scattered or absorbed during the propagation process, thereby reducing the reflection intensity of the noise. 2. The inclined section can disperse the sound wave energy entering the pipe in different directions instead of concentrating it in one direction, thereby reducing the noise intensity in a single direction and achieving an overall noise reduction effect. 3. Sound waves may form standing waves when reflected in the pipe, resulting in the enhancement of noise at a specific frequency. The inclined section changes the conditions for sound wave reflection, which can reduce the probability of standing waves forming, thereby reducing noise overall. 4. The inclined section changes the flow direction of the airflow to a certain extent, reduces the rapid change of the flow state of the airflow at the intake end face, reduces the airflow disturbance phenomenon at the intake end, and reduces the vortex and turbulence phenomenon at the intake end, thereby reducing noise.

[0015] In addition, the inclined section expands the air intake area of ​​the air filter inner tube air intake end compared to the straight section, so that the utility model has the advantages of a trumpet-shaped air intake end and can reduce airflow resistance. The usual trumpet mouth is formed by a variable diameter part, which needs to be processed. The expansion of the air intake end area of ​​the utility model does not depend on the variable diameter, so there is no need to set the variable diameter part, and it is easier to process and manufacture than the trumpet-shaped air intake end.

[0016] The utility model can be conveniently and firmly connected to the upper shell of the air filter through the connecting seat and the clamping support plate, so that the utility model can be conveniently assembled in the air filter.

[0017] The arrangement of the plane docking plate and the convex ridges facilitates the connection and positioning of the utility model with the air outlet of the air filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 It is a main structural schematic diagram of the utility model.

[0020] Figure 3 yes Figure 2 Left view of .

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the utility model installed in the upper shell of the air filter. DETAILED DESCRIPTION

[0022] like Figures 1 to 4As shown in the figure, the present utility model provides an inner insertion tube for an air filter, which is used for an air cleaner and includes a tubular body 1. The air cleaner includes an upper housing 2 and a lower housing which are connected to each other, and an air outlet cavity is provided in the upper housing 2 and the lower housing; the body 1 has an air inlet end 3 and an air outlet end 4,

[0023] The body 1 is in a bent tubular shape. The air outlet end 4 is used to connect to the air outlet of the air cleaner, and the air inlet end 3 is used to communicate with the middle part of the air outlet cavity of the air cleaner; the section of the air inlet end 3 of the body 1 is an inclined plane. Usually, the section of the end face of a tube is a plane perpendicular to the axis. In the present utility model, the section of the air inlet end 3 is an inclined plane that is not perpendicular to the axis. Figure 3 It can be intuitively seen from the figure that the section of the air inlet end 3 is an inclined plane.

[0024] Based on the following principles, the inclined section of the air inlet end 3 of the inner insertion tube for the air filter can improve the noise reduction effect:

[0025] 1. The inclined section changes the propagation path of sound waves, causing some sound waves to be scattered or absorbed during propagation, thereby reducing the reflection intensity of noise. 2. The inclined section can disperse the sound wave energy entering the pipeline in different directions instead of concentrating in one direction, thereby reducing the noise intensity in a single direction and achieving the overall noise reduction effect. 3. The reflection of sound waves in the pipeline may form standing waves, resulting in the enhancement of noise at specific frequencies. The inclined section changes the conditions of sound wave reflection, which can reduce the probability of standing wave formation and thus reduce the noise as a whole. 4. The inclined section changes the flow direction of the air flow to a certain extent, reduces the sharp change in the air flow state at the air inlet end 3 surface, reduces the air flow disturbance phenomenon at the air inlet end 3, and reduces the vortex and turbulent flow phenomena at the air inlet end 3, thereby reducing the noise.

[0026] In addition, compared with a flat section, the inclined section expands the air inlet area of the air inlet end 3 of the inner insertion tube for the air filter, making the present utility model also have the advantages of a flared air inlet end 3 and being able to reduce the air flow resistance. Usually, a flared opening is formed by a variable diameter part, and the variable diameter part needs to be processed. The expansion of the air inlet end 3 area of the present utility model does not depend on variable diameter, so there is no need to set a variable diameter part (or a contraction pipe section or an expansion pipe section). Compared with the flared air inlet end 3, it is easier to process and manufacture.

[0027] The air inlet end 3 is connected with a connecting seat 5, and screw holes 6 are provided on the connecting seat 5. The screw holes 6 are used to connect to the upper housing 2 of the air cleaner through (self-tapping) screws;

[0028] Two clamping support plates 7 for clamping and supporting on the upper housing 2 of the air cleaner are provided in the middle of the body 1. A clamping groove 8 is formed between the two clamping support plates 7, and the clamping groove 8 is used to be clamped with a clamping rib 9 on the upper housing 2 of the air cleaner.

[0029] The utility model can be conveniently and firmly connected to the upper housing 2 of the air filter through the connecting seat 5 and the clamping support plate 7, so that the utility model can be conveniently assembled in the air filter.

[0030] The outlet end 4 of the body 1 is radially extended with a flat docking plate 10, which is used to connect with the outlet of the air filter; the top of the flat docking plate 10 is provided with a ridge, which is used to be embedded in the positioning groove above the outlet of the air filter.

[0031] The arrangement of the flat butt joint plate 10 and the convex ridges facilitates the connection and positioning of the utility model with the air outlet of the air filter.

[0032] When using, Figure 4 As shown, the utility model is integrated in the upper housing 2 of the air filter. When the motor vehicle is running, the gas in the air outlet cavity of the air filter enters the utility model through the inclined air inlet end 3. Under the effect of the above principle, not only the noise is reduced, but also the air flow disturbance is reduced, and the air flow resistance is reduced, so that the utility model has good promotion and application value.

[0033] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An air filter inner insert tube, comprising a tubular body, used for an air filter, the air filter comprising an upper shell and a lower shell connected to each other, an air outlet cavity is provided in the upper shell and the lower shell; the body has an air inlet end and an air outlet end, Features: The main body is in the shape of a curved tube, the air outlet end is used to connect to the air outlet of the air filter, and the air inlet end is used to connect to the middle part of the air outlet cavity of the air filter; the air inlet end section of the main body is an inclined surface.

2. The air filter inner insert tube according to claim 1, characterized in that: The air inlet end is connected to a connecting seat, and the connecting seat is provided with a screw hole, and the screw hole is used to connect the upper shell of the air filter by screws; The middle part of the body is provided with two clamping support plates for clamping and supporting on the upper shell of the air filter, and a clamping groove is formed between the two clamping support plates, and the clamping groove is used for clamping with the clamping convex strip on the upper shell of the air filter.

3. The air filter inner insert tube according to claim 1, characterized in that: A flat docking plate is radially extended from the air outlet of the body, and the flat docking plate is used to be connected with the air outlet of the air filter; a convex ridge is provided on the top of the flat docking plate, and the convex ridge is used to be embedded in the positioning groove above the air outlet of the air filter.

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