CN-115508031-B - Air filter tightness testing device and testing method

CN115508031BCN 115508031 BCN115508031 BCN 115508031BCN-115508031-B

Abstract

The invention discloses a device and a method for testing air filter tightness, and belongs to the technical field of air filter testing. The air filter tightness testing device comprises a vibrating mechanism, an ash adding mechanism, an air extracting mechanism and a reference air filter, wherein the vibrating mechanism comprises a vibration generating mechanism and a vibrating table, the output end of the vibration generating mechanism is connected with the vibrating table, the air filter to be tested is placed on the vibrating table, the ash adding mechanism is used for inputting air with impurities to an air inlet of the air filter to be tested, the impurities at least comprise fluorescent powder, the air extracting mechanism is communicated with an air outlet of the air filter to be tested through a connecting pipe and is used for extracting air from the air outlet of the air filter to be tested, and the reference air filter is arranged on the connecting pipe and is used for carrying out secondary filtration on the air filtered by the air filter to be tested. The air filter tightness testing method is realized by using the air filter tightness testing device. The invention can realize the long-term tightness test of the air filter under the vibration working condition and improve the accuracy of the tightness test of the air filter.

Inventors

HE XUJUN
YU HAIGANG
WU ZHI
CAO YONG

Assignees

上海弗列加滤清器有限公司

Dates

Publication Date: 20260505
Application Date: 20220927

Claims (6)

1. The air filter tightness testing method is characterized by being applied to an air filter tightness testing device, and the air filter tightness testing device comprises the following steps: The vibration mechanism (10) comprises a vibration generation mechanism (11) and a vibration table (12), wherein the output end of the vibration generation mechanism (11) is connected with the vibration table (12), and the air filter (100) to be tested is arranged on the vibration table (12); The ash adding mechanism (20) is used for inputting air with impurities into an air inlet (101) of the air filter (100) to be detected, wherein the impurities at least comprise fluorescent powder; the air extraction mechanism (30) is communicated with the air outlet (102) of the air filter (100) to be detected through a connecting pipe (40) and is used for extracting air from the air outlet (102) of the air filter (100) to be detected; A reference air filter (50) provided on the connection pipe (40) for performing secondary filtration on air filtered through the air filter (100) to be tested; the test method comprises the following steps: S1, calculating the impurity concentration in the output air required by the ash adding mechanism (20) according to the service life of a laboratory of the air filter (100) to be detected, the ash containing amount and the ash adding speed of the ash adding mechanism (20); S2, weighing the weight W 1 of the reference air filter (50) before testing; S3, placing the empty filter (100) to be tested on the vibration table (12); S4, firstly starting the vibration mechanism (10), then starting the ash adding mechanism (20) and the air extracting mechanism (30), and inputting air with impurities into the air filter (100) to be tested by the ash adding mechanism (20) according to the impurity concentration calculated in the step S1, wherein the air filter (100) to be tested starts to work; s5, observing whether a fluorescence effect exists at the downstream of the filter element of the air filter (100) to be detected, if so, judging that the tightness of the air filter (100) to be detected does not reach the standard, and if not, continuing the following steps: S6, continuously working the air filter (100) to be tested until the working time reaches the service life of a laboratory of the air filter (100) to be tested, wherein the ash adding mechanism (20), the air extracting mechanism (30) and the vibration mechanism (10) stop working; S7, weighing the weight W 2 of the reference air filter (50) after the test, and comparing W 1 with W 2 , wherein if W 1 is smaller than W 2 , the tightness of the air filter (100) to be tested does not reach the standard, and if W 1 is equal to W 2 , the tightness of the air filter (100) to be tested reaches the standard; the laboratory service life of the air filter (100) to be tested is obtained by the following steps: a1, mounting an air filter (100) to be tested on a solid vehicle, and mounting a second accelerometer (300) on the air filter (100) to be tested, wherein the second accelerometer (300) is used for measuring acceleration signals of the air filter (100) to be tested; a2, a physical vehicle starts a road test, and acceleration signals of the second accelerometer (300) are collected in real time; A3, analyzing the acceleration signal of the second accelerometer (300) to finally obtain time domain data of vibration of the air filter (100) to be detected; A4, converting time domain data of vibration of the air filter (100) to be tested into frequency domain data, and obtaining the laboratory service life of the air filter (100) to be tested according to the frequency domain data and the actual service life of the air filter (100) to be tested; The vibration mechanism (10) is used for driving the air filter (100) to be tested to vibrate in the linear direction; In step S4, the vibration mechanism (10) drives the air filter (100) to be tested to vibrate along the front-rear direction of the self structure, so as to perform a tightness test of the air filter (100) to be tested under the first vibration working condition; In the step S5, whether a fluorescence effect exists at the downstream of the filter element of the air filter (100) to be tested is observed, if so, the tightness of the air filter (100) to be tested does not reach the standard, and the test is finished, if not, the step S6 is continued; In step S7, weighing the weight W 2 of the reference air filter (50) after the test, if W 1 is smaller than W 2 , the tightness of the air filter (100) to be tested does not reach the standard, and ending the test, and if W 1 is equal to W 2 , the tightness of the air filter (100) to be tested reaches the standard under the first vibration working condition.
2. Test method according to claim 1, characterized in that a first accelerometer (70) is provided on the vibrating table (12).
3. The test method according to claim 1, wherein the test device further comprises an ultraviolet light source (60).
4. The test method according to claim 1, wherein the vibration mechanism (10) further comprises an ash blocking member (13), the ash blocking member (13) comprises a horizontal support plate (131) and a baffle plate (132), the baffle plate (132) is arranged to protrude downwards from the horizontal support plate (131) along the outer circumference of the horizontal support plate (131), the horizontal support plate (131) is located on the vibration table (12), and the air filter (100) to be tested is supported on the horizontal support plate (131).
5. The test method according to claim 1, wherein in step S7, if the tightness of the air filter (100) to be tested meets the standard under the first vibration condition, the steps are continued: S8, replacing a new filter element for the air filter (100) to be tested and the reference air filter (50), and changing the relative postures of the air filter (100) to be tested and the vibrating table (12), so that the vibrating mechanism (10) drives the air filter (100) to be tested to vibrate along the left and right directions of the structure of the air filter, and the tightness test of the air filter (100) to be tested under the second vibration working condition is carried out; S9, repeating the steps S1-S4; S10, observing whether a fluorescence effect exists at the downstream of a filter element of the air filter (100) to be tested, if so, the tightness of the air filter (100) to be tested does not reach the standard, and ending the test, otherwise, repeating the step S6; S11, weighing the weight W 2 of the reference air filter (50) after testing, comparing W 1 with W 2 , if W 1 is smaller than W 2 , the tightness of the air filter (100) to be tested does not reach the standard, and ending the test, and if W 1 is equal to W 2 , the tightness of the air filter (100) to be tested also reaches the standard under the second vibration working condition.
6. The testing method according to claim 5, wherein in step S11, if the tightness of the air filter (100) to be tested meets the standard under the second vibration condition, the steps are continued: S12, continuously replacing new filter elements for the air filter (100) to be tested and the reference air filter (50), changing the relative postures of the air filter (100) to be tested and the vibration table (12), vibrating the air filter (100) to be tested along the up-down direction of the self structure, and performing the tightness test of the air filter (100) to be tested under the third vibration working condition; S13, repeating the steps S1-S4; s14, observing whether a fluorescence effect exists at the downstream of a filter element of the air filter (100) to be tested, if so, judging that the tightness of the air filter (100) to be tested does not reach the standard, and ending the test, otherwise, repeating the step S6; S15, weighing the weight W 2 of the reference air filter (50) after testing, comparing W 1 with W 2 , if W 1 is smaller than W 2 , the tightness of the air filter (100) to be tested does not reach the standard, and ending the test, and if W 1 is equal to W 2 , the tightness of the air filter (100) to be tested reaches the standard, and ending the test.

Description

Air filter tightness testing device and testing method Technical Field The invention relates to the technical field of air filtration testing, in particular to a testing device and a testing method for air filtration tightness. Background The air filter, called air filter for short, refers to a device for removing particulate impurities in air. Automobiles are often equipped with an air filter in front of the engine to filter impurities in the air, and if the air filter is not arranged, impurities enter the engine, so that abrasion of parts is increased. The air filter comprises a shell and a filter element, wherein the filter element is formed by winding filter paper, air with impurities directly flows through the filter element along the axial direction, the air is filtered through micropores of the filter paper, the air smoothly passes through the filter paper, and the impurities are adsorbed on the filter paper. In addition, the filter element and the shell are also sealed by a sealing ring, so that air is prevented from directly flowing from the air inlet to the air outlet of the shell without passing through the filter element, and the filtration cannot be completed. However, when the sealing effect between the filter element and the shell is poor or the bonding between the inner filter paper and the outer filter paper is incomplete, impurities can leak, and the impurities can gather at the downstream of the filter element or escape along with air, so that the impurities can easily enter the engine, and therefore, the air filter is required to be subjected to a tightness test. The existing air filter tightness test is mostly carried out under the static working condition, the test time is short, and when the air filter is actually used on a vehicle, the air filter is basically used under the vibration working condition in the whole life cycle, so that the existing air filter tightness test result is inaccurate, and the reference value is low. Disclosure of Invention The invention aims to provide a device and a method for testing the tightness of an air filter, which can realize the long-term tightness test of the air filter under the vibration working condition and improve the accuracy of the tightness test of the air filter. In order to achieve the above object, the following technical scheme is provided: A test device for air filtration tightness, comprising: the vibration mechanism comprises a vibration generation mechanism and a vibration table, wherein the output end of the vibration generation mechanism is connected with the vibration table; The ash adding mechanism is used for inputting air with impurities into an air inlet of the air filter to be detected, and the impurities at least comprise fluorescent powder; The air extraction mechanism is communicated with the air outlet of the air filter to be detected through a connecting pipe and is used for extracting air from the air outlet of the air filter to be detected; and the reference air filter is arranged on the connecting pipe and is used for carrying out secondary filtration on air filtered by the air filter to be tested. Further, a first accelerometer is arranged on the vibrating table. Further, the testing device also comprises an ultraviolet lamp source. Further, vibration mechanism still includes the ash blocking piece, the ash blocking piece includes horizontal support plate and baffle, the baffle is followed the periphery of horizontal support plate is protruding downwards the horizontal support plate sets up, the horizontal support plate is located on the shaking table, await measuring empty straining support in the horizontal support plate. A method for testing air filter tightness using the air filter tightness testing device described in any of the above, the method comprising the steps of: S1, calculating the impurity concentration in the output air required by the ash adding mechanism according to the service life of a laboratory to be tested, the ash containing amount and the ash adding speed of the ash adding mechanism; s2, weighing the weight W 1 before the reference air filtration test; s3, placing the empty filter to be tested on the vibrating table; S4, starting the vibration mechanism, starting the ash adding mechanism and the air extracting mechanism, and inputting air with impurities into the air filter to be tested according to the impurity concentration calculated in the step S1 by the ash adding mechanism, wherein the air filter to be tested starts to work; S5, observing whether a fluorescence effect exists on the downstream of the filter element of the air filter to be detected, if so, the tightness of the air filter to be detected does not reach the standard, and if not, continuing the following steps: S6, continuing to work the air filter to be tested until the working time reaches the service life of a laboratory of the air filter to be tested; S7, weighing the weight W 2 of the reference air filter after the te