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1. 发明授权

US5226472A Modulated temperature control for environmental chamber 失效
标题翻译：环境室的调制温度控制
公开(公告)号：US5226472A
公开(公告)日：1993-07-13
申请号：US792705
申请日：1991-11-15
申请人： John A. Benevelli , Michael L. Murray , Duane C. Drinkwine
发明人： John A. Benevelli , Michael L. Murray , Duane C. Drinkwine
IPC分类号： B60H1/00 , F24F11/08 , F25B41/04 , F25B49/02 , G05D23/19
CPC分类号： F24F11/08 , B60H1/00814 , F25B49/02 , G05D23/1919 , F25B2313/023 , F25B2600/2521 , F25B41/043
摘要： A temperature-controlled environmental chamber includes a resistance heater controlled by a solid state relay and a refrigeration unit including an electronically controlled suction throttling valve connected in the refrigerant line between the evaporator and the inlet of the compressor. A temperature controller senses the temperature in the chamber and compares it to a set point temperature and outputs a pulse-width modulated control signal indicative of the difference between the two temperatures. The control signal directly controls the heater relay for substantially continuous variation between minimum and maximum heating conditions. The control signal is converted to an analog signal for controlling the throttling valve of the refrigeration unit for substantially continuous variation between maximum and minimum cooling conditions, so that the amount of cooling provided is inversely proportional to the amount of heating provided. A hot gas bypass is provided for maintaining a minimum input pressure on the condenser and a refrigerant bypass is provided to maintain the input temperature of the compressor below a predetermined maximum.
摘要翻译：温度控制环境室包括由固态继电器控制的电阻加热器和包括连接在蒸发器和压缩机入口之间的制冷剂管线中的电子控制的吸入节流阀的制冷单元。温度控制器感测室中的温度并将其与设定点温度进行比较，并输出指示两个温度之间的差的脉宽调制控制信号。控制信号直接控制加热器继电器，用于在最小和最大加热条件之间实质上连续的变化。控制信号被转换为用于控制制冷单元的节流阀的模拟信号，用于在最大和最小冷却条件之间实质上连续的变化，使得所提供的冷却量与所提供的加热量成反比。提供热气旁通以保持冷凝器上的最小输入压力，并且提供制冷剂旁路以将压缩机的输入温度保持在预定最大值以下。

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