Multi-degree-of-freedom cable fire spread test device
A test device and fire spread technology, applied in the direction of measuring devices, electric devices, and thermometers using electric/magnetic elements that are directly sensitive to heat, can solve the problem of single space layout of cables and large gaps in cable complex configuration states , limit cable fire dynamics in-depth analysis and other issues, to achieve the effect of convenient and controllable overall height, flexible and adjustable ignition power, and flexible and changeable space configuration
Active Publication Date: 2019-04-16
HUAQIAO UNIVERSITY
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Problems solved by technology
However, many of the current research devices on the behavior of cable fire spread are aimed at cables with simple configurations such as vertical and horizontal. The state gap is large; local open flames are mostly used in the ignition method, and it is difficult to provide more accurate experimental initial and boundary conditions; the effect of the environmental wind field is not considered too much, and it is also different from the actual fire field
Therefore, the existing test devices and methods have actually limited the in-depth analysis of cable fire dynamics research and failure laws.
Method used
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Embodiment Construction
[0028] The present invention will be further described below through specific embodiments.
[0029] refer to Figure 1 to Figure 4 , a multi-degree-of-freedom cable fire spread test device, including a base, a bracket, an ignition unit, a fan unit, a weighing unit 113, a detection circuit, and the like. The base is provided with a rotatable round table 108. The round table 108 is placed on a cylinder 109. The two are kept coaxial and can rotate coaxially. The cylinder 109 is rotatably connected to the base. The base adopts a square heat-resistant Drywall 110. Both the round table 108 and the heat-resistant gypsum board 110 are engraved with an angle scale, and when viewed from the top, it can be accurately judged that when the round table 108 rotates, the relative angle between the two changes, and the weighing unit is placed directly below the heat-resistant gypsum board 110 113, the weighing unit 11 adopts an electronic balance, and is used to measure the mass change durin...
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Abstract
The invention provides a multi-degree-of-freedom cable fire spread test device comprising a base, a bracket, an ignition unit, a fan unit, a weighing unit and a detecting circuit. The base is placed on the weighing unit and is provided with a rotatable circular table; the bottom of the bracket is rotatably connected with the round table, the top of the bracket is provided with a connecting rod, and the connecting rod is connected with a cable to be tested in series; the ignition unit is mounted on the cable to be tested; the fan unit is located on one side of the base and faces the cable to betested; and the detecting circuit and the connecting rod are connected in series to form a closed loop to detect voltage and current. By means of the multi-degree-of-freedom cable fire spread test device, through the coupling effect of external controllable ambient wind and the cable interior electric core large current heat effect, special fire spreading, final failure state development, the critical condition and the like of a single-beam tested cable sample under the degree of freedom of a complex space can be studied.
Description
technical field [0001] The invention relates to the fire spread behavior of cables under the action of ambient wind and the field of cable fire safety, and more specifically relates to a multi-degree-of-freedom cable fire spread test device. Background technique [0002] With the development of my country's economic construction, the application of electrical cables has been widely used in various fields, providing an important guarantee for the national economy and people's livelihood. However, the cladding material of the cable, especially the insulating layer and the outer sheath layer, etc. are usually processed by thermoplastic polymers, such as polyethylene, polypropylene or polystyrene. If there is no special treatment, these materials are flammable. In the event of a fire or heat, they may soften and deform, and then form complex fire spread phenomena such as flowing and burning. In fact, the number of fire accidents caused by cables has remained high in my country ...
Claims
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IPC IPC(8): G01N25/22G01K7/02G01J5/00
CPCG01J5/0003G01K7/02G01N25/22
Inventor 涂然曾怡周学进杜建华杨凯姜羲
Owner HUAQIAO UNIVERSITY