WO2015085810A1 - Testing device for determining resonant cavity structure of inlet pipe of air filter - Google Patents

Abstract

A testing device for determining a resonant cavity structure of an inlet pipe of an air filter includes an inlet pipe (1), a resonant cavity (2) and a filling for filling partial volume and/or partial communicating holes (3) of the resonant cavity (2). The resonant cavity (2) communicates with the inlet pipe (1) via a plurality of communicating holes (3). The testing device enables the precise correction of the noise elimination frequency of the resonant cavity in a noise test so as to determine the resonant cavity structure accurately.

Description

Test device for determining the structure of the air filter of the air filter of the air filter Technical field

The present invention relates to the field of vehicles, and more particularly to a test apparatus for determining the structure of an air intake manifold cavity of an air filter.

Background technique

With the continuous development of automobiles, people have higher and higher requirements for the ride comfort of automobiles. Noise and vibration are important factors affecting comfort, and noise mainly comes from the intake and exhaust of the engine.

In the process of vehicle development, in order to reduce the intake noise and accurately measure the noise frequency, the test will use the air intake pipe sample with noise reduction structure to measure. The inlet pipe sample used in the test adopts a Holm Hertz muffler structure. As shown in FIG. 1, the intake pipe sample includes an intake pipe 101 and a cavity 102, wherein the cavity 102 communicates with the intake pipe 101 through a communication pipe 103.

Since the muffling frequency is proportional to the aperture of the communicating tube, it is inversely proportional to the volume of the resonant cavity and the length of the communicating tube, and the shape and volume of the resonant cavity are mostly determined due to the influence of space in the arrangement. Therefore, in the intake noise test, after the intake pipe sample is fabricated, the muffling frequency of the resonant cavity has been determined, and the muffling frequency cannot be accurately corrected during the test to accurately determine the structure of the resonant cavity. In order to accurately determine the muffling frequency of the resonant cavity (ie, the structure of the resonant cavity), it is necessary to fabricate a plurality of different sizes of the intake pipe samples for noise testing, which is not only expensive but also has a long cycle.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, it is an object of the present invention to provide a test apparatus for determining the structure of an air intake manifold cavity of an air filter, which can accurately correct the noise cancellation frequency of the cavity in a noise test to accurately determine the cavity Structure.

A test apparatus for determining an air filter intake manifold cavity structure according to an embodiment of the present invention includes an intake pipe, a resonant cavity, and a filler for filling a partial volume of the resonant cavity and/or a portion of the communication hole, The resonant cavity communicates with the intake pipe through a plurality of communication holes.

A test apparatus for determining an air filter intake manifold cavity structure according to an embodiment of the present invention connects a resonant cavity to an intake pipe through a plurality of communication holes, and during the test, the resonance can be changed by adding or removing a filler The volume of the cavity and/or the number of communicating holes to correct the muffling frequency of the resonant cavity, thereby determining the structure of the resonant cavity, the test cost is low, the cycle is short, and the development progress of the vehicle is greatly accelerated.

According to an example of the invention, the resonant cavity is enclosed by an upper and a lower housing that are detachably connected.

According to an example of the present invention, the lower case is connected to the outer wall of the intake pipe, and the communication hole is provided on the lower case and penetrates the outer wall of the intake pipe.

According to an example of the present invention, the communication holes are evenly distributed on the lower case.

According to an example of the present invention, the resonant cavity includes a plurality of sub-chambers of different volumes, the plurality of sub-chambers being disposed on the upper casing and/or the lower casing for separating the resonance The partitions of the chamber are separated, and each of the sub-chambers has a plurality of the communication holes.

According to an example of the invention, the plurality of sub-chambers are sequentially increased from top to bottom.

According to an example of the present invention, the number of the communication holes in the plurality of sub-chambers is different.

According to an example of the present invention, the diameters of the communication holes in the plurality of sub-chambers are different.

According to an example of the present invention, a plurality of the communication holes in each of the sub-chambers have the same aperture.

According to an example of the invention, the sub-chambers are three.

According to an example of the invention, the filler comprises a first filler for filling the subchamber to change a vacant volume of the subchamber.

According to an example of the invention, the first filler is a sponge or a cloth mass.

According to an example of the present invention, the filler includes a second filler for detachably blocking the communication hole.

According to an example of the invention, the second filler is a rubber sheet or a cloth mass.

According to an example of the present invention, an L-shaped connecting pipe for connecting the intake pipe and the air filter is further included, and the resonant cavity is provided on a portion of the L-shaped connecting pipe that is in contact with the intake pipe.

According to an example of the present invention, the L-shaped connecting pipe includes a first pipe segment and a second pipe segment vertically connected to the first pipe segment, the first pipe segment is connected to the intake pipe, and the resonant cavity is disposed at the On the first pipe section.

According to an example of the present invention, the outer wall of the intake pipe is sleeved with a fixing band.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of a sample of an intake pipe for testing in the prior art;

2 is a schematic structural view of a test apparatus for determining a structure of an air intake manifold cavity of an embodiment of the present invention;

3 is a diagram of a test device for determining the structure of an air intake manifold cavity of an air filter according to an embodiment of the present invention. Schematic diagram of the structure behind the casing.

Reference mark:

1. Intake pipe; 1a, air inlet;

2, resonant cavity; 3, connecting holes; 4, sub-chamber;

5. L-shaped connecting pipe; 51, first pipe section; 52, second pipe section; 52a, engaging portion;

6, fixed cuff; 7, partition; 8, filling.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and a simplified description, rather than indicating or implying The device or component referred to must have a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting the invention.

It should be noted that the terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. Further, in the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present invention, it should be noted that the terms "mounting" and "connecting" are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly stated and defined. Ground connection; it can be directly connected, or it can be connected indirectly through an intermediate medium, which can be the internal connection of two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

Referring to FIGS. 2 and 3, a test apparatus for determining an air filter intake manifold cavity structure according to an embodiment of the present invention includes: an intake pipe 1, a resonant cavity 2, and a partial volume and/or a portion for filling the resonant cavity 2. The filler 8 of the communication hole 3 is connected.

The cavity 2 is in communication with the intake pipe 1 through a plurality of communication holes 3, and the number of the communication holes 3 can be set according to the required muffling frequency of the cavity 2, for example, 50, 100 or 200.

A test apparatus for determining an air filter intake manifold cavity structure according to an embodiment of the present invention, the resonant cavity 2 is connected to the intake pipe 1 through a plurality of communication holes 3, and the filler may be added or removed during the test. 8 to change The volume of the resonant cavity 2 and/or the number of the communicating holes 3 are used to correct the muffling frequency of the resonant cavity 2, thereby determining the structure of the resonant cavity 2, with low test cost and short cycle, which greatly accelerates the development progress of the vehicle.

Specifically, the intake pipe 1 has an intake port 1a that communicates with the atmosphere, and gas in the atmosphere enters the intake pipe 1 through the intake port 1a.

The steps of testing using a test apparatus for determining the structure of an air filter intake manifold cavity in accordance with an embodiment of the present invention are:

(1) Check the status of the vehicle, confirm that the parts of the vehicle are in the latest design state, and the connecting parts are closely connected to meet the assembly requirements;

(2) arranging a noise sensor at the intake port of the intake line in front of the original air filter and in the cab (for example, at the driver's office, the co-pilot, the passenger, etc.);

(3) Perform noise test under various working conditions on the whole vehicle and extract noise spectrum map;

(4) replacing the intake line in front of the original air filter with the test device for determining the structure of the air intake tube cavity of the air filter, and adjusting the position of the sensor at the air inlet 1a of the intake pipe 1;

(5) Perform noise test on the whole vehicle and extract a noise spectrum map;

(6) comparing the noise spectrogram obtained in step (3) with the noise spectrogram in step (5);

(7) adjusting the volume of the resonant cavity 2 and the number of the communicating holes 3 according to the comparison result;

(8) Repeat steps (5) to (7) until the noise result meets the requirements;

(9) Record the structural parameters of the resonant cavity 2 that meet the requirements, that is, the volume of the resonant cavity 2, and the number of the communicating holes 3.

According to the result measured in the step (9), the intake noise reduction tube having the best noise reduction effect is obtained.

In order to facilitate the correction during the test, the noise reduction frequency is corrected, and the cavity 2 is surrounded by the detachably connected upper and lower casings. This detachable structure of the cavity 2 facilitates filling a partial volume of the cavity 2 by the filler 8 during the test, or clogging part of the communication hole 3 to change the parameters of the cavity 2 to obtain a resonance having an optimum noise reduction effect. Cavity structure.

Specifically, the lower casing is connected to the outer wall of the intake pipe 1, and the communication hole 3 is provided on the lower casing and penetrates the outer wall of the intake pipe 1. Preferably, the communication holes 3 are evenly distributed on the lower casing to help obtain accurate test results.

In order to expand the range of the muffling frequency of the resonant cavity 2 of the test device for determining the structure of the air intake manifold cavity of the air filter, the resonant cavity 2 comprises a plurality of sub-chambers 4 of different volumes, which are arranged in the upper casing The partitions 7 for separating the resonant cavities 2 on the body and/or the lower casing are partitioned, and each of the sub-chambers 4 has a plurality of communicating holes 3 therein. The volume and number of subchambers 4 are dependent on the need for noise reduction. Specifically, the volume range and the number of sub-chambers 4 required by the vehicle may be roughly estimated in advance, and then the sub-chamber 4 volume and the number of sub-chambers 4 of the test device are set to be larger than the maximum value of the estimated range, so as to facilitate The structure of the resonant cavity 2 is changed by adding the filler 8.

As shown in FIG. 3, the sub-chambers 4 are three. From top to bottom, the volume of the sub-chambers 4 is sequentially increased. This resonant cavity 2 structure can correct the noise of three different frequency segments.

Further, the number of the communication holes 3 in the plurality of sub-chambers 4 is different, and thus the muffling frequency in each sub-chamber 4 is different due to the cavity 2 of the test device for determining the structure of the air-intake pipe cavity. The muffling frequency is equal to the sum of the muffling frequencies of the respective sub-chambers 4, and therefore, the number of the communicating holes 3 in the plurality of sub-chambers 4 is set to be different, and the test for determining the structure of the air-intake pipe cavity of the air filter can be expanded. The correction range of the device's noise cancellation frequency.

Preferably, the apertures of the communication holes 3 in the plurality of sub-chambers 4 are different, and since the noise cancellation frequency is related to the aperture (positive correlation), the apertures of the communication holes 3 in the plurality of sub-chambers 4 are different, and the same can be expanded. The correction range of the muffling frequency is determined by the test device for determining the structure of the air intake manifold cavity of the air filter.

Preferably, the apertures of the plurality of communication holes 3 in each of the sub-chambers 4 are the same, so that by calculating the number of the communication holes 3 blocked by the filler 8, the change value of the muffling frequency of the cavity 2 can be determined. .

Preferably, the filler 8 comprises a first filler for filling the subchamber 4 to change the vacant volume of the subchamber 4. The first filler may be a sponge, a cloth, or the like.

Preferably, the filler 8 includes a second filler for detachably blocking the communication hole 3, and the second filler may be a rubber sheet, a cloth or the like.

Preferably, the test device for determining the structure of the air filter intake manifold cavity includes an L-shaped connecting tube 5 for connecting the intake pipe 1 and the air filter, and the resonant cavity 2 is disposed in the L-shaped connecting pipe 5 and the intake pipe 1 Connected to the part. The L-shaped connecting pipe 5 facilitates the connection of the intake pipe 1 to the air filter.

Specifically, the L-shaped connecting pipe 5 includes a first pipe section 51 and a second pipe section 52 vertically connected to the first pipe section 51. The first pipe section 51 is connected to the intake pipe 1, and the resonant cavity 2 is disposed on the first pipe section 51, and second. A wedge-shaped engaging portion 52a is disposed on the outer wall of the pipe segment 52, and the air filter is provided with a card slot matched with the wedge-shaped engaging portion 52a, and the air filter is inserted by inserting the wedge-shaped engaging portion 52a into the card slot. The second pipe section 52 is connected.

During the test, the upper casing can be disassembled, and the noise reduction parameters can be corrected by blocking the plurality of communication holes 3 by using the second filler or adding the first filler in the cavity 2 to facilitate the noise test. Gas noise adjustment.

The outer wall of the intake pipe 1 is sleeved with a fixing band 6 for fixing the intake pipe 1 during testing to prevent the intake pipe 1 from shaking during the test, thereby affecting the test result.

The steps of testing using the test apparatus provided by the present invention for determining the structure of the air intake manifold cavity of the air filter are as follows:

(1) Check the status of the vehicle, confirm that the parts of the vehicle are in the latest design state, and the connecting parts are closely connected to meet the assembly requirements;

(2) arranging a noise sensor at the intake port of the intake line in front of the original air filter and in the cab (for example, at the driver's office, the co-pilot, the passenger, etc.);

(3) Perform noise test under various working conditions on the whole vehicle and extract noise spectrum map;

(4) replacing the intake line in front of the original air filter with the test device for determining the structure of the air intake tube cavity of the air filter, and adjusting the position of the sensor at the air inlet 1a of the intake pipe 1;

(5) Perform noise test on the whole vehicle and extract a noise spectrum map;

(6) comparing the noise spectrogram obtained in step (3) with the noise spectrogram in step (5);

(7) adjusting the volume of each sub-chamber 4 and the number of communication holes 3 in each sub-chamber 4 according to the comparison result;

(8) Repeat steps (5) to (7) until the noise result meets the requirements;

(9) Recording the structural parameters of the resonant cavity 2 that meet the requirements, that is, the volume of each sub-chamber 4, and the number of communicating holes 3.

According to the result measured in the step (9), the intake noise reduction tube having the best noise reduction effect is obtained.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. Particular features, structures, materials or features described in the examples or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims (17)

A testing device for determining a structure of an air intake manifold cavity of an air filter, comprising: Intake pipe; a resonant cavity that communicates with the intake pipe through a plurality of communication holes; A portion of a volume and/or a portion of the communication hole for filling the cavity. A test apparatus for determining an air filter intake manifold cavity structure according to claim 1, wherein said resonant cavity is surrounded by an detachably connected upper and lower casing. A test apparatus for determining an air filter intake manifold cavity structure according to claim 2, wherein said lower casing is connected to said intake pipe outer wall, and said communication hole is provided on said lower casing And through the outer wall of the intake pipe. A test apparatus for determining an air filter intake manifold cavity structure according to claim 2, wherein said communication holes are evenly distributed on said lower casing. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 2 to 4, wherein the resonant cavity comprises a plurality of sub-chambers having different volumes, the plurality of sub-chambers Separated by a partition plate disposed on the upper casing and/or the lower casing for partitioning the resonant cavity, each of the sub-chambers has a plurality of the communication holes. A test apparatus for determining an air filter intake manifold cavity structure according to claim 5, wherein said plurality of subchambers are sequentially increased from top to bottom. A test apparatus for determining an air filter intake manifold cavity structure according to claim 5 or 6, wherein the number of said communication holes in said plurality of said subchambers is different. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 5 to 7, wherein a diameter of said communication hole in said plurality of said subchambers is different. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 5-8, wherein a plurality of said communication holes in each of said subchambers have the same aperture. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 5-9, wherein the subchambers are three. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 5-10, wherein the filler includes a sub-chamber for filling the sub-chamber to change the sub-chamber The first filling of the empty volume of the chamber. The test apparatus for determining the structure of an air filter intake manifold cavity according to claim 11, wherein the first filler is a sponge or a cloth. A test apparatus for determining an air filter intake manifold cavity structure according to any one of claims 1 to 12, wherein the filler includes a second for detachably blocking the communication hole Filler. The test apparatus for determining the structure of an air filter intake manifold cavity according to claim 13, wherein the second filler is a rubber sheet or a cloth mass. The test apparatus for determining the structure of an air filter intake manifold cavity according to any one of claims 1 to 14, further comprising: An L-shaped connecting tube for connecting the intake pipe and the air filter, the resonant cavity being disposed on a portion of the L-shaped connecting pipe that is in contact with the intake pipe. The test apparatus for determining an air filter intake manifold cavity structure according to claim 15, wherein the L-shaped connecting pipe comprises a first pipe section and a second pipe section vertically connected to the first pipe section, The first pipe section is connected to the intake pipe, and the resonant cavity is disposed on the first pipe section. The test apparatus for determining the structure of an air intake manifold cavity according to any one of claims 1 to 16, wherein the outer wall of the intake pipe is sleeved with a fixing band.

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