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Commonly used display cases Pressure-sensitive temperature controller
Commonly used display cases Pressure-sensitive temperature controller
WT-1226 type display cases temperature relay, it is a temperature-wrapped temperature relay. It is mainly composed of temperature bulb, capillary tube, bellows, fixed value spring, differential spring, lever, arm, contact and other components. The temperature bulb, capillary tube and bellows constitute a temperature sensing mechanism. The sealed temperature sensing mechanism is filled with R12, R22 or R40 (methyl chloride) refrigerants for different applications. After the temperature bulb feels the temperature of the measured medium, the saturated pressure of the refrigerant acts on the bellows to cause the ejector pin to generate an upward pushing force. This pushing torque and the torque generated by the fixed-value spring reach a torque balance to the knife edge fulcrum. In refrigeration technology, the WT-1226 temperature relay is commonly used for the temperature control of the display cases. The temperature sensing mechanism senses the indoor temperature of the display cases and controls the opening and closing of the refrigerant supply solenoid valve. When the moving contact and the fixed contact 2 are closed, the solenoid valve is turned on, and the refrigerant enters the display cases evaporator to cool down. When the temperature of the display cases drops to the specified lower limit, the pressure of the temperature bulb will drop. Through the lever action of the bellows, the movable contact can be separated from the fixed contact 2, and the fixed contact 1 is closed, the solenoid valve is open, and the refrigerant stops entering the display. cases.
WJ3.5 display cases The structure of the temperature relay is obviously different from that of the WT-1226, but the working principle is roughly the same. Working principle: The temperature sensing mechanism composed of temperature bulb, capillary tube, and bellows generates a force on the lever, and the top torque is balanced with the tension torque generated by the spring. If the temperature of the measured medium is lower than the set value, because the top torque is less than the pulling torque, the lever rotates counterclockwise with O as the fulcrum, the lever presses the micro switch to cut off the power supply and stop the solenoid valve liquid supply: vice versa , When the temperature of the measured medium rises, the action process is reversed. The micro switch is reset, the solenoid valve circuit is turned on, and the solenoid valve is opened for liquid supply.
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