我们设计制造的这种土温箱,以煤油灯为热源,可以保持恒温,每台造价仅20元左右。一、结构:箱体长47厘米,宽47厘米,高48厘米。整个箱体由二层泡桐木板制作,二层木板间隙1.5厘米,内填充普通棉花。箱底至箱顶正中贯穿一根直径为3.8厘米的铁皮管,铁管与木板、棉花间用石棉绝热。铁管下口与安放在箱体下部的煤油灯罩套接,铁管上口用一中间打有直径为3毫米小洞的石 We design and manufacture of this kind of soil temperature box, kerosene lamps as a heat source, can maintain a constant temperature, each cost only about 20 yuan. First, the structure: box length 47 cm, width 47 cm, 48 cm high. The whole box made of two layers of paulownia wood, two layers of wood 1.5 cm gap, filled with ordinary cotton. Bottom to the top of the box through a diameter of 3.8 cm of the metal pipe, iron pipe and wood, cotton asbestos insulation. Iron pipe and the lower mouth placed in the lower part of the kerosene lamp cover socket, iron pipe with a hole in the middle with a diameter of 3 mm small hole in the stone