A Measuring Device for Heat Transfer Performance of Filled Fiber Aggregates

Abstract

The invention relates to a measurement apparatus of heat transfer performance of wadding-filled fiber aggregates. The invention is characterized in that the apparatus comprises a heat-insulation protecting seat upper part of which is provided with two-section groove; a lower layer of the groove is sequentially provided with a heating plate, a hot-fluid sensor, and a medical silica gel layer, wherein plane dimensions of the heating plate, the hot-fluid sensor, and the medical silica gel layer are the same with that of the lower layer of the groove; an upper part of the medical silica gel layer is provided with a first temperature sensor, an upper layer of the groove is fastened with a sample cylinder; an inner surface of the sample cylinder is in sliding fit with an outer surface of a push cylinder, an upper part of the push cylinder is opened, a lower end of the push cylinder is provided with a mesh interlayer, a second temperature sensor is fixedly arranged above the mesh interlayer, a cylinder hoop is fixed on an outer wall of the push cylinder and provided with a vertical through hole, a screw is sleeved in the through hole and is fixedly connected with the through hole through a pair of height-adjusting nuts, the screw is fixedly connected with an upper surface of the heat-insulation protecting seat; and the heating plate, the hot-fluid sensor, the first temperature sensor and the second temperature sensor are connected with a control circuit.

Description

technical field [0001] The invention relates to a measuring device for thermal insulation performance, in particular to a measuring device for heat transfer performance of wadding fiber aggregates. The invention belongs to the technical field of heat transfer measurement. Background technique [0002] Filled fiber aggregates are often used as thermal insulation materials for clothing, and their thermal insulation function is mainly realized by blocking the way of heat transmission. Heat transfer is mainly carried out in three ways: conduction, convection and radiation. In practical applications, the characteristics and internal structure of the flocculation material itself affect its heat transfer rate, and its bulk density is one of the factors that affect the thermal performance of the flocculation aggregate. [0003] At present, there are many testing devices for the heat transfer performance of fabrics, but there are few measuring devices specially for the heat transfe...

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the patent application number of 200510024967.4 discloses an in-situ comprehensive measurement method and device for the conductivity of variable density fiber aggregates. When using the heater, the selected heater is in the shape of a small block, and there is a certain distance from the fiber sample. The temperature around the heater is high, and the temperature away from the heater is low, so the uniformity of heat generation is difficult to control.

Its heat dissipation is carried out by convection heat dissipation through the small holes at the bottom of the measuring cavity of the push cylinder, which is quite different from the conduction and radiation heat dissipation of human skin mainly through tiny pores, and cannot truly imitate the heat dissipation environment of the human body

During the actual wearing process, the warmth retention of clothes using wadding fiber aggregates is greatly affected by the flow velocity of the ambient air. Although there is an air hole window on the top of the push tube measurement chamber of the device, the ventilation in the tube can be improved by adjusting However, there is still a large difference between this and the direct and complete contact between the flocculation material and the atmosphere during actual wearing, which leads to deviations in the measured heat transfer performance

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 cost of implementation is high.

In addition, the bottom of the sample tube 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 performed after adjusting the balance of the suspended sample tube. This structure is cumbersome and inconvenient to operate.

The measurement of the thermal conductivity of the fiber aggregate by the device is only the temperature index of the upper and lower measurement chambers, without other relevant parameters such as heat flow. Accurate heat transfer performance indicators such as thermal insulation rate, thermal resistance and Cro value of fiber aggregates

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