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  • 压力式温度计的主要构造
  • 本站编辑:杭州博阳仪器仪表有限公司发布日期:2019.08.30
压力式温度计的主要构造
1、温包:它是直接与被测介质相接触来感受温度变化的元件,因此要求它具有高的强度,小的膨胀系数,高的热导率以及抗腐蚀等性能。根据所充工作物质和被测介质的不同,温包可用铜合金、钢或者不锈钢来制造。
2、毛细管:它是用铜或钢等材料冷拉成的无缝圆管,用来传递压力的变化。其外径为1.5~5mm,内径为0.15~0.5mm。如果它的直径越细,长度越长,则传递压力的滞后现象就越严重。也就是说,温度计对被测温度的反应就越迟钝。然而,在同样的长度下,毛细管越细,仪表的精度就越高。毛细管容易被破环,折断,因此,必须加以保护。对不经常弯曲的毛细管可用金属软管做保护套管。
3、弹簧管:它是一般压力表用的弹性元件。

Main Structure of Pressure Thermometers
Temperature packet: It is a component that is in direct contact with the measured medium to sense temperature changes. Therefore, it is required to have high strength, small expansion coefficient, high thermal conductivity, and corrosion resistance. The package can be made of copper alloy, steel or stainless steel depending on the working substance to be filled and the medium to be measured.
2, capillary: It is made of copper or steel and other materials cold pull into a seamless round tube, used to transmit changes in pressure. Its external diameter is 1.5 ~ 5mm and its internal diameter is 0.15 ~ 0.5 mm. If it is smaller in diameter and longer in length, the delay in transmitting pressure is more serious. In other words, the more insensitive the thermometer is to the temperature to be measured. However, at the same length, the finer the capillary, the higher the accuracy of the instrument. Capillaries are easily broken and broken, so they must be protected. The metal hose can be used as a protective sleeve for infrequently bending capillaries.
3, spring tube: It is a general pressure meter for elastic components.
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