Snap-action temperature controller with high sensitivity

Abstract

The invention provides a snap-action temperature controller with the high sensitivity. The snap-action temperature controller comprises a shell, a rivet, a movable contact spring, a fixed connecting board, a movable contact, a fixed contact, a ceramic rod, a guiding base, a duplex-metal temperature sensing sheet and a sealing cover. The movable contact spring is fixed to an inner cavity of the shell through the rivet; the movable contact is fixed to the movable end of the movable contact spring; the fixed contact is fixed to the inner cavity of the shell and faces the movable contact; a guide base is installed at the top of the shell; the duplex-metal temperature sensing sheet is provided with a center portion, at least three fixing feet are arranged on the periphery of the center portion, and the duplex-metal temperature sensing sheet is fixed to the portion between the guide base and the sealing cover through the fixing feet; the ceramic rod penetrates through a guide hole of the guide base and abuts against the portion between the movable contact spring and the duplex-metal temperature sensing sheet; the guide base and the shell are packaged together through the sealing cover. The snap-action temperature controller with the high sensitivity overcomes the shortages that a traditional snap-action temperature controller with a duplex metal sheet of a circular shape, a butterfly shape and the like is slow in action and long in thermal reaction time are overcome, the reaction speed and the sensitivity of temperature sensing action of the temperature controller are effectively improved, and temperature control of the temperature controller is made to be more accurate, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of temperature controllers, in particular to a high-sensitivity snap-type temperature controller. Background technique [0002] At present, the traditional bimetal snap-type thermostat is encapsulated by a sealed cover, and the main moving part is a disc-shaped bimetal temperature sensing piece, which will reversely jump after being heated. The ceramic rod inside the thermostat pushes the moving reed to realize the on-off of the moving contact and the fixed contact. The ceramic rod is inserted in the guide hole of the guide seat to move axially. Usually, the guide seat is solid except for the guide hole. [0003] Since the thermostat is controlled by the temperature-sensing component, it takes a certain amount of heat transfer time for the temperature-sensing component to absorb heat. Therefore, this traditional bimetal jumping thermostat has the disadvantages of slow temperature-sensing action and poor sen...

AI Technical Summary

Problems solved by technology

[0003] Since the thermostat is controlled by the temperature-sensing component, it takes a certain amount of heat transfer time for the temperature-sensing component to absorb heat. Therefore, this traditional bimetal jumping thermostat has the disadvantages of slow temperature-sensing action and poor sensitivity. Cut off the circuit in time at the first time of overheating, but need to wait for a long time for heat absorption, so that the heat of the temperature-sensitive action parts reaches the set critical temperature, and the thermostat can suddenly jump.

As a result, the ambient temperature around the heating parts of the equipment is higher than the temperature controlled by the thermostat, especially for some high-power heating equipment, the temperature sensing speed of the thermostat is obviously lagging behind the controlled one, thus accelerating the aging of equipment parts , directly reduces the service life of the equipment, and even causes fire accidents in severe cases, reducing the working reliability of the thermostat

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