An automatic door closing device for refrigerators based on capacitance change

Abstract

An automatic door-closing device for refrigerators based on capacitance changes, which relates to the field of electric power, and includes a box body. A turning slot is provided in the middle of the box body. A gear bar is movably connected to the middle part of the turning slot, and a dielectric plate is fixedly connected to the middle part of the gear bar. , the top inner wall of the turn slot is fixedly connected with a spring, the left side of the spring is fixedly connected with a conductive block, and the left side of the conductive block is fixedly connected with an electric contact. The automatic door closing device for refrigerators based on capacitance changes, through the cooperation of the motor and the gear rod, when the refrigerator door is opened, the refrigerator door will drive the gear rod down to rotate out of the box, so that the dielectric plate rotates downward together, causing the positive plate The area relative to the negative plate increases. At this time, the voltage in the circuit is greater than the minimum channel voltage of the varistor, so that the motor is energized, and the motor drives the gear bar to rotate upwards through the gear. The gear bar drives the refrigerator door to close automatically, thus achieving automatic The effect of closing the door can effectively avoid forgetting to close the refrigerator door and ensure the normal use of the refrigerator.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an automatic door closing device for refrigerators based on capacitance changes. Background technique [0002] Refrigerators are essential electrical equipment in daily life. We often put fresh fruits or vegetables we bought in the refrigerator to keep them fresh. We also often put meat products in the refrigerator to extend the shelf life. Putting quick-frozen food in the refrigerator has achieved the effect of long-term preservation. [0003] When the current refrigerator is in use, the refrigerator door often forgets to close. After taking out the desired item from the refrigerator, it will take the item and walk away directly, resulting in the refrigerator door being forgotten to close, and all the cold air in the refrigerator is lost, resulting in The refrigerator cannot keep the ingredients and fruits inside fresh, resulting in a decline in the freshness of the ingredients an...

AI Technical Summary

Problems solved by technology

[0003] When the current refrigerator is in use, the refrigerator door often forgets to close. After taking out the desired item from the refrigerator, it will take the item and walk away directly, resulting in the refrigerator door being forgotten to close, and all the cold air in the refrigerator is lost, resulting in The refrigerator cannot keep the ingredients and fruits inside fresh, resulting in a decline in the freshness of the ingredients and fruits, or even rot. If the door of the refrigerator is not closed, the interior will always be in working condition, resulting in high consumption of the refrigerator. High consumption state will reduce the service life of the refrigerator and cause damage to internal parts

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