Refrigeration control method of constant temperature and humidity box, refrigeration system and constant temperature and humidity box

Abstract

The invention discloses a refrigeration control method of a constant temperature and humidity box and a refrigeration system. By using an electronic expansion valve instead of a traditional capillarytube or a manual throttle valve in the refrigeration system, and by taking advantage of the variable opening characteristics of the electronic expansion valve, the refrigerant flow rate of a pluralityof capillary tubes or manual throttle valves in a control method of the refrigerating capacity of a traditional constant temperature and humidity box is simulated out, an opening value of the electronic expansion valve is directly input, the opening of the electronic expansion valve can be controlled, and the refrigerant flow rate in the refrigeration system can be changed; and the control effectis equal to the effect of switching of multichannel throttle elements in the refrigeration system of the traditional constant temperature and humidity box. According to the refrigeration control method of the constant temperature and humidity box, a plurality of magnetic valves and the throttle elements can be saved, a circuit and a refrigeration pipeline are further greatly simplified, and the adjustment of the refrigeration capacity is convenient and fast; and the change rate of the refrigeration capacity is adjustable, the refrigeration capacity transits slowly, and when the linear temperature and humidity change, the disturbance fluctuation of the refrigeration capacity to the temperature and the humidity is greatly reduced.

Description

technical field [0001] The invention relates to a refrigeration control method for a constant temperature and humidity box, a refrigeration system and a constant temperature and humidity box, belonging to the technical field of refrigeration. Background technique [0002] For some precision instruments or components, when measuring or testing some equally precise and demanding products, it often needs to be carried out in a constant temperature and humidity environment. Since these demanding products often work in a constant temperature and humidity environment, in order to simulate this environment, a constant temperature and humidity chamber can be used to test these demanding products in a constant temperature and humidity chamber. The constant humidity chamber can be used to test the performance of products or materials in various environments and to test the heat resistance, cold resistance, dry resistance, and humidity resistance of various materials. It is suitable fo...

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Problems solved by technology

The same kind of fixed pipeline and manual regulating valve are also difficult to accurately control the flow of refrigerant, and the efficiency of operation is also very low. It is difficult to find an accurate control point and realize precise control of refrigeration.

Moreover, the number of solenoid valves and manual regulating valves used is large, and the cost is high

And after the manual regulating valve has been used for a long time, the spring in the valve body will gradually lose its elasticity, and the performance of the manual regulating valve will decrease, or even lose its regulating effect.

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