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发送器是气动自动装置中一个很重要部分,但是目前还十分薄弱。因此气动发送器的研究工作在国内外都引起有关方面的极大重视。热偶型温度发送器中,通常在电一气转换部分都用折皺管作为反馈元件,该元件刚度及迟滞较大,这就不得不提高补偿元件中的作用力到数十克以致数百克力。这样在电一气转换器前必须放置前置电子放大器,使结构复杂化。在热偶型温度发送器中引入空气射流力作为补偿力,就根除了上述反馈元件的刚度、迟滞和磨擦的影响,大大提高了补偿系统的灵敏度。这样就有可能直接把通用热电偶的热电势直接转变成气压信号,而不再需要前置电子放大器[1]。本文是作者在刘豹付教授指导下作的研究工作的一部分,旨在实验基础上探索以空气射流力为补偿力的气动热电偶高温发送器的设计与计算方法。
Transmitter is a very important part of the pneumatic automatic device, but it is still very weak. Therefore, the research work of pneumatic transmitter has aroused great attention of all parties concerned at home and abroad. Thermocouple temperature transmitter, usually in the gas-to-gas conversion part of the bellows as a feedback element, the element stiffness and hysteresis larger, which would have to increase the force of the compensation element to tens of grams so that hundreds of grams of force . This must be placed in front of the electric one converter front amplifier, the structure is complicated. The introduction of air jets in the thermocouple temperature transmitter as the compensation force eliminates the effects of the stiffness, hysteresis and friction of the feedback element and greatly increases the sensitivity of the compensation system. This makes it possible to directly convert the thermocouple of a general purpose thermocouple into a barometric signal without the need for a preamplifier [1]. This paper is part of the research work under the guidance of Professor Liu Baofu and aims to explore the design and calculation method of pneumatic thermocouple high temperature transmitter with air jet force as compensation force.