Measuring apparatus for moisture transmission performance of wadding fiber assembly

Abstract

The invention relates to a measuring apparatus for the moisture transmission performance of a wadding fiber assembly. The measuring apparatus comprises a heat insulation protection seat. The upper part of the heat insulation protection seat is provided with a two-section groove; the lower layer of the groove is a constant temperature water bath tank; a thermal resistance filament is fixed in the constant temperature water bath tank; a simulated skin is covered over an upper liquid level of the constant temperature water bath tank; a first temperature sensor and a first humidity sensor are arranged above the simulated skin; the upper layer of the groove is in immovable fit with a sample cylinder; the lower end of the sample cylinder is provided with a mesh interlayer; the interior surface of the sample cylinder and the outer surface of a pushing cylinder are in sliding fit; the upper end of the pushing cylinder is opened, the lower end of the pushing cylinder is provided with a mesh interlayer, and a second temperature sensor and a second humidity sensor are fixedly arranged above the mesh interlayer; and the thermal resistance filament, the first temperature sensor, the second temperature sensor, the first humidity sensor, the second humidity sensor, a refrigerator and a fan are connected with a control circuit and are connected with a computer through a signal pickup assembly for realization of data processing.

Description

technical field [0001] The invention relates to a device for measuring the moisture-conducting performance, in particular to a device for measuring the moisture-transmitting performance of a wadding fiber assembly. The invention belongs to the technical field of moisture transfer measurement. Background technique [0002] When wadding fiber aggregates are used as clothing filling materials, the thermal insulation performance and moisture permeability are the two main performances to be investigated, and the two will have an inseparable mutual influence. Only when clothing, the human body and the environment reach a balance of heat and humidity, can the various organs of the human body be in a comfortable physiological state. The human skin is evaporating and losing water all the time. In a short time, the water evaporated from the skin is exported from the close-fitting layer of the clothing to the outer layer, which can keep the human skin dry and reduce discomfort. The pr...

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Problems solved by technology

The Chinese invention patent with the patent application number 200510024967.4 discloses an in-situ comprehensive measurement method and device for the conductivity of fiber aggregates with variable density. It is done by inputting water vapor with different relative humidity into the measurement cavity through the catheter. The water vapor input in this way contains a certain amount of liquid droplets, and these liquid droplets are easy to attach to the bottom of the fiber assembly, making the material at the bottom absorb water and wet. It is not easy to diffuse upwards, so that the water cannot be transferred to the upper part of the flocculated fiber assembly; the diffusion of water vapor is carried out through the small holes at the bottom of the measuring cavity of the push cylinder, which is different from the evaporation of human body water mainly through the tiny pores of the human skin. The large difference cannot truly imitate the evaporative humidity environment of the human body; the device cannot imitate the microenvironment between the clothing and the human body, let alone measure the moisture conductivity by changing the size of the microenvironment space and simulating the different degrees of tightness of the clothing , there is a difference between the measured moisture conductivity and the actual wearing process of the clothing; in the actual wearing process of the clothing using the fiber-filled aggregate, its moisture conductivity is greatly affected by the ambient air flow velocity, although the device There is an air hole window on the top of the measuring chamber of the pushing cylinder, which can improve the air permeability and moisture permeability in the cylinder through adjustment, but due to the limited number of air hole windows, it cannot be completely unimpeded with the atmosphere, which will affect the transmission speed of water vapor, causing part of the water vapor to stay in the fiber The bottom of the assembly cannot be transferred to the upper part, and the measured moisture conductivity is deviated; although the device is equipped with a refrigerator, its purpose is only to control the temperature of the measurement chamber in a low temperature state, the air convection intensity is low, and the water vapor transfer rate is slow , the test efficiency is low; for the driving part of the pusher, the moving beam is connected with the driving twin-screw, and the motor drive is used to control the movement of the pusher measurement cavity. This kind of transmission structure is relatively complicated and the implementation cost is high; in addition , the bottom of the sample cylinder is sleeved in the lower measurement chamber, and the upper part is hung on the hook of the suspension frame. The test can only be carried out after adjusting the balance of the suspended sample cylinder. The structure is cumbersome and inconvenient to operate; Only the humidity index of the upper and lower measurement chambers can be measured, and the humidity ratio of the upper and lower measurement chambers can only be obtained to qualitatively give the moisture transfer performance of the fiber aggregate, but the accurate moisture conductivity performance index of the moisture resistance of the fiber aggregate cannot be quantitatively obtained

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