Search

CN-122016599-A - Multipurpose cloth air permeability testing equipment and testing method thereof

CN122016599ACN 122016599 ACN122016599 ACN 122016599ACN-122016599-A

Abstract

The invention discloses a multipurpose cloth air permeability test device and a test method thereof, the device adopts a lower, middle and upper three-layer modularized vertical stacking structure. The lower power module produces a steady and adjustable vertical airflow. The middle bearing module is used for clamping the sample and realizing leak-free sealing. The upper visualization module comprises a non-cover liquid box with an array hole, can convert the air flow penetrating through the cloth into a visual stable air column after injecting liquid, and can inhibit the cloth from shaking by utilizing the hydrostatic pressure and provide controllable back pressure. The device can integrate an image analysis system and automatically extract the air column parameters. The testing method comprises the steps of precise sample filling and sealing, quantitative liquid injection, set air speed, gas-liquid coupling test, multidimensional image analysis and multi-working-condition scanning. The invention realizes visualization and stabilization of ventilation process, can evaluate cloth uniformity, simulate multi-wind speed and multi-back pressure environment, reduces dependence on high-cost sensors, and is suitable for research, development, quality control and teaching.

Inventors

  • LIU TAIYONG
  • YE XIAOYAN

Assignees

  • 杭州浩影实业有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The multipurpose cloth air permeability testing device is characterized by comprising an upper module, a middle module and a lower module which are sequentially arranged from top to bottom and detachably connected; The lower module comprises a box body (1), a fan (2) arranged in the box body (1) and a rectifier (4) positioned above an air outlet of the fan (2), and a lower air outlet (3) is formed in the top of the box body (1); the middle module comprises a cover plate (6), an upper air opening (7) coaxial with the lower air opening (3) is formed in the cover plate (6), and an annular sealing groove (9) is formed in the upper surface of the cover plate (6) around the upper air opening (7); The upper module comprises a non-cover liquid tank (13), a plurality of array holes (14) are formed in the area, opposite to the upper air opening (7), of the bottom plate of the non-cover liquid tank (13), transparent liquid (15) is injected into the non-cover liquid tank (13) during testing, and a testing area for clamping a cloth sample is formed between the cover plate (6) and the bottom plate of the non-cover liquid tank (13).
  2. 2. The multipurpose cloth ventilation performance testing device according to claim 1, wherein the cover plate (6) is provided with an integrally formed annular boss (8) at the edge of the upper air opening (7) for positioning and stabilizing the air guide pipe, and further comprises a transparent air guide pipe (5), wherein the lower end of the air guide pipe (5) is in sealing connection with the lower air opening (3), and the upper end of the air guide pipe is sleeved outside the annular boss (8) to form a seal.
  3. 3. The multipurpose cloth ventilation performance test equipment according to claim 2, wherein the lower end of the air guide pipe (5) is in static seal with the lower air inlet (3) in an adhesive manner, and/or a sealing ring is arranged between the air guide pipe (5) and the annular boss (8).
  4. 4. The multipurpose cloth ventilation performance testing apparatus according to claim 1, wherein a sealing strip (10) is embedded in the annular sealing groove (9), a flexible gasket (12) is arranged on the lower surface of the bottom plate of the capless liquid tank (13) in a contact area corresponding to the sealing strip (10), and the sealing strip (10) and the flexible gasket (12) together form an edge sealing system for adapting to different cloth surface textures.
  5. 5. The multipurpose cloth air permeability testing apparatus according to claim 1, wherein the rectifier (4) is a deep honeycomb aluminum rectifier or is composed of a honeycomb in combination with a plurality of stainless steel wire meshes for converting air flow into vertical uniform jet.
  6. 6. The multipurpose cloth ventilation performance test apparatus of claim 1, further comprising a wind speed control system, wherein the wind speed control system comprises a PID speed regulation controller, a wind speed sensor and a man-machine interface, and is used for realizing accurate, continuously adjustable and stable outlet wind speed.
  7. 7. The multipurpose cloth air permeability testing apparatus according to claim 1, further comprising an image analysis system including a camera, a light source, and analysis software for capturing an image of the air column formed in the capless liquid tank (13) and automatically analyzing and calculating at least one parameter of an average height, an average diameter, and a stability index of the air column.
  8. 8. A testing method based on the multipurpose cloth air permeability testing apparatus of any one of claims 1 to 7, comprising the steps of: s1, sample loading and sealing, namely flatly covering a cloth sample on the upper air port (7) of the cover plate (6) and the annular sealing groove (9), and then pressing down the upper module to clamp the sample and form edge sealing; S2, injecting liquid and setting, namely injecting transparent liquid (15) with preset height into the non-cover liquid tank (13), and setting a test wind speed; s3, testing operation, namely starting the fan (2), adjusting the air speed to a set air speed, enabling stable air flow to vertically penetrate through a cloth sample and then enter liquid (15) to form a visible air column; s4, information extraction, namely acquiring the form information of the air column through a direct observation and/or image analysis system; And S5, analyzing and evaluating, namely carrying out qualitative evaluation and/or quantitative analysis on the air permeability of the cloth based on the morphological information.
  9. 9. The method according to claim 8, wherein in step S5, the quantitative analysis comprises the steps of fixing the liquid level height, gradually changing the test wind speed, drawing a response curve of the air column shape parameter along with the change of the wind speed, and/or fixing the test wind speed, gradually changing the liquid level height, and researching the influence of the back pressure on the air column shape parameter.
  10. 10. The method according to claim 8, characterized in that in step S2, before injecting the transparent liquid (15), the blower (2) is started and operated at the lowest wind speed, and a positive pressure barrier is established in the wind channel to prevent the liquid from being sucked into the lower wind channel through the array holes (14) during the injection or at the beginning of the test.

Description

Multipurpose cloth air permeability testing equipment and testing method thereof Technical Field The invention belongs to the technical field of cloth ventilation detection, and particularly relates to multipurpose cloth ventilation performance testing equipment and a testing method thereof. Background The air permeability of cloth is a key physical index for determining the comfort, the functionality and the applicability of specific application scenes (such as medical protection and outdoor exercises). Currently, industry standard testing methods rely mainly on air flow measurement at a fixed differential pressure, and their corresponding devices commonly suffer from the following technical drawbacks: 1. The traditional air permeability meter only outputs macroscopic average air permeability or air permeability resistance, and the testing process can not provide key quality information about air flow penetrating paths, local pore distribution uniformity of cloth or whether microscopic blockage exists. Such information loss is fatal to quality control of high added value or functional fabrics (e.g., uniform moisture-conductive fabrics, symmetrical pressure-sensitive fabrics). 2. The core components are a high-precision differential pressure sensor and a flowmeter, so that the equipment cost is high, the calibration and maintenance are complex, the device is sensitive to environmental vibration and airflow pulsation, and the device is difficult to stably use in a production field or a laboratory with limited resources. 3. The operator can not visually see the physical process of the interaction of the air flow and the cloth while obtaining the numerical result, which is not beneficial to the mechanism research and the rapid diagnosis of the problems in the teaching and research and development processes. In the prior art, as disclosed in patent CN119322002a, a cloth air permeability test device is provided, which adopts a T-shaped tube structure, and supplies air to the inside of the fixed tube through a fan, and the cloth air permeability is reflected by using the displacement of the porous sponge block. The device, although of relatively simple construction, still has the following drawbacks: 1. The air flow distribution is indirectly measured only through the distance sensor, so that visual observation of the air flow penetrating process cannot be realized, and key information such as uniformity of cloth pores, local blockage and the like cannot be obtained; 2. in the test process, cloth is easy to shake or bulge due to air flow impact, and the test stability and repeatability are affected; 3. depending on single wind speed and pressure conditions, it is difficult to simulate the actual wearing environment with multiple wind speeds and multiple back pressures; 4. The intelligent image analysis and data processing capability is lacking, the test result depends on manual interpretation, and the efficiency is low. Therefore, cloth ventilation performance testing equipment which can intuitively visualize ventilation process, flexibly simulate multi-wind speed conditions, has qualitative evaluation and quantitative analysis capabilities and is relatively simple and reliable in structure is developed, and has urgent market demands and technical values. Disclosure of Invention The invention provides multipurpose cloth air permeability test equipment and a test method thereof, wherein a stable air column is formed through air-liquid coupling, an invisible air flow penetrating process is converted into a clear visible image, and intelligent image analysis is combined, so that air permeability indexes can be indirectly obtained, air flow states and cloth uniformity can be evaluated through parameters such as the height, the diameter, the stability and the like of the air column, the limitation of 'black box test' of the traditional equipment is broken through, and the problems in the background technology are solved. In order to achieve the purpose, the technical scheme is that the multipurpose cloth air permeability testing device adopts an integrated design of vertically stacking a lower layer, a middle layer and an upper layer in a modularized mode, functions of all modules are clear, and accurate testing is achieved cooperatively. 1. Lower power and steady flow module The core of the module is to generate stable, vertical and speed-adjustable uniform air flow, which comprises: The rigid box body is provided with an air inlet, the position of the air inlet is set according to the requirement, a primary pressure stabilizing space is formed inside the air inlet, air flow pulsation generated by the fan is effectively buffered, and a pressure equalizing environment is provided for upstream air flow. The direct current brushless fan is positioned in the rigid box body and is matched with the PID speed regulation controller and the wind speed feedback sensor, so that the accurate, stable and continuously adjustable o