Cooling liquid constant thermal apparatus and control method thereof

Abstract

The invention discloses a constant temperature device of cooling fluid and the control method thereof. An electric regulation valve of the device includes a flow divider valve and a controlled motor, the outside of the flow divider valve is provided with a hydrothermal inlet, a cold fluid inlet, first and second outlets, wherein, the hydrothermal inlet is directly communicated with a valve cavity, and the cold fluid inlet and the second outlet are communicated with a flow channel; the flow channel and the first outlet are communicated with the valve cavity through a disc. The disc is connected with a rotation shaft controlled by the motor. A fluid storage tank, a pump, a heating element, the electric regulation valve and a refrigerator are connected to form a loop. A control unit is connected with two temperature sensors in the fluid storage tank and the refrigerator and the motor of the electric regulation valve. The control method is that: the control unit opens or closes the first outlet as well as the flow channel with same proportion according to the rotation of fluid temperature control regulation valve disc in the fluid storage tank, and changes the proportion of cold and hot fluid entering the fluid storage tank so as to regulate the temperature. The control unit controls the startup and stopping of the refrigerator according to the fluid temperature in the refrigerator, and determines to start up when the shutdown is larger than the safe interval. The invention is simple with low cost, and can control the fluid temperature accurately.

Description

(1) Technical field [0001] The invention relates to a device for automatically adjusting temperature and a control method thereof, in particular to a cooling liquid constant temperature device and a control method thereof. (2) Background technology [0002] In many industrial application fields, constant temperature control of cooling fluid is required. For example, laser marking machine needs constant temperature control of cooling water to ensure stable laser output power and good beam quality. Commonly used coolant constant temperature control methods include window control and frequency conversion continuous adjustment. [0003] Window control type: measure the temperature of the coolant, start the refrigerator when the coolant temperature is higher than the set upper limit, and shut down the refrigerator when it is lower than the set lower limit, and the coolant temperature is controlled to change between the set upper and lower limits. Since the refrigerator is not su...

AI Technical Summary

Problems solved by technology

This scheme has high temperature control accuracy, but the controller cost is high and uneconomical, which affects its popularization and application

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