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What does the rice cooker temperature insurance do?

The function of the thermal fuse on the live line of the rice cooker is only when the magnetic control switch of the rice cooker fails (that is, it will not trip), to protect the electric heating core from burning out due to excessive temperature. It is an emergency measure to directly replace it with a wire. Generally, there is no major problem. safe to use. After the rice in the electric rice cooker is ready, when the temperature of the inner pot rises by 103°C, the temperature control device of the electric rice cooker automatically jumps off, and the heater power supply is cut off. If there is no reason that the temperature control device does not jump off, the heater continues to heat, and when the temperature reaches 120° C., the overtemperature insurance fuses, which cuts off the heater power supply, so as to protect the electric cooker from being burned out. Extended information: The following items are items that must be observed to ensure the normal operation of the thermal cutoff: i) Each thermal fuse has rated current and voltage, fusing temperature (Tf), operating temperature (Th), and maximum temperature (Tm) and must be used under specified parameters. ii) When selecting the installation position of the fuse, care should be taken not to transfer the stress to the fuse due to the vibration in the finished product and the displacement of other accessories. iii) It should be installed in a place where the temperature will not rise above the maximum operating temperature after the thermal fuse is blown.

What is the function of thermal fuse

Abstract: When using heating appliances in our daily life, such as electric kettles, hair dryers, electric irons, wall breakers, etc., when the working hours are too long and the appliances reach a certain high temperature, the power will be automatically cut off to protect safety. This is mainly due to the function of the thermal fuse, which can sense the overheating generated by the abnormal operation of electrical and electronic products, so as to cut off the circuit to avoid the occurrence of fire. Let's take a look at the related issues of thermal fuses. What is a thermal fuse? A thermal fuse is also called a thermal fuse, which is a temperature sensing circuit cut-off device. Commonly used in: hair dryers, electric irons, rice cookers, electric stoves, transformers, motors, water dispensers, coffee pots, etc. It responds to the increase in temperature rise of electrical appliances, regardless of the operating current of the circuit. What is the function of the thermal fuse The thermal fuse can sense the overheating generated by the abnormal operation of electrical and electronic products, so as to cut off the circuit to avoid the occurrence of fire. After the thermal fuse is operated, it cannot be used again, and it only operates once at the fusing temperature. Principle of temperature-controlled fuse 1. The organic-type thermal fuse is composed of a movable contact, a spring, and a fusible body. Before the thermal fuse is activated, the current flows from the left lead to the movable contact, and flows through the metal case to the right lead. Working principle: When the external temperature reaches the predetermined temperature, the organic matter can be melted, and the compression spring will become loose. That is, the spring expands, and the movable contact separates from the left lead. The circuit is opened, and the current between the movable contact and the left lead is cut off. 2. Porcelain tube type thermal fuse is composed of axisymmetric lead wire, fusible alloy that can be melted at a specified temperature, a special mixture to prevent it from melting and oxidation, and an insulating porcelain tube. Working principle: When the ambient temperature rises, the specific resin mixture begins to liquefy. When the melting point is reached, with the help of the resin mixture, the molten alloy quickly shrinks into a ball under the action of surface tension, centering on the leads at both ends, thereby permanently cutting off the circuit. 3. Rectangular shell type thermal fuse A section of fusible alloy wire is connected between the two pins of the thermal fuse. The fusible alloy wire is covered with special resin, and the current can flow from one pin to the other. Working principle: When the temperature around the thermal fuse rises to its action temperature, its fusible alloy melts and under the action of surface tension and the help of special resin, it shrinks into a ball and attaches to the ends of the two pins. In this way, the circuit is permanently cut off . How to judge that the temperature fuse is broken 1. Measure with a multimeter Connect the two test leads to the two leads of the temperature fuse, and use the multimeter’s conduction test to measure its on-off. If the multimeter shows conduction and sound, it means the temperature of the fuse. A fuse is good, and vice versa is bad. 2. Capacitive pen test We can use the electric pen to check whether there is electricity, hold one end of the fuse with the hand of the electric pen, and touch it with the other hand; if the fuse is good, the electric pen should light up at this time, this method should pay attention to safety, remember . 3. Tension test Apply a tension of 1.8kg on the two leads of the thermal fuse and keep it for 10 minutes. If it is loose, it means that the thermal fuse under test is broken and does not meet the standard.