Non-contact temperature-measuring electric cooker and temperature measuring method

Abstract

The invention discloses a non-contact temperature-measuring electric cooker and a temperature measuring method. In a case of the electric cooker, an inner case, an inner pot and a heating tray are arranged, a magnetic temperature sensing element which is tightly contacted with the bottom of the inner pot, a temperature measuring element corresponding to the position of the magnetic temperature sensing element and a control circuit are also arranged in the case of the electric cooker, the temperature measuring element comprises a temperature measuring induction coil and a magnet exciting coil,the magnetic temperature sensing element is a ferromagnet or a ferrimagnet, the temperature characteristic of magnetic conductivity of a magnet is utilized and the magnet exciting coil and the temperature measuring induction coil are combined, when the magnetic induction of the magnetic temperature sensing element varies along with temperature, a generated field varies, the variation is reflectedin the temperature measuring induction coil and a corresponding temperature electric signal is generated, and the control circuit is used for realizing temperature detection and control. The electriccooker disclosed by the invention can carry out continuous non-contact temperature measurement in the working range of the electric cooker, and the application range of the electric cooker in a working process is widened to the utmost extent.

Description

technical field [0001] The invention relates to an electric rice cooker and a temperature measuring method, in particular to an electric rice cooker and a temperature measuring method which realize non-contact temperature measurement by using the magnetic permeability temperature characteristics of iron or ferrous magnets. Background technique [0002] The temperature limit switch used in the existing electric rice cooker is to manually press the lever to turn on the power supply and start cooking. After the rice is cooked, the temperature limit switch switches the circuit from the heating state to the heat preservation state through the lever connection mechanism. Many, the accumulation of dimensional deviation of each component, coupled with improper assembly process, or user misoperation and other factors, make the rice cooker often appear uncooked rice, sandwiched raw rice, burnt rice and other phenomena in the actual use of the user, and even burn out the heating plate a...

AI Technical Summary

Problems solved by technology

[0008] 2. Due to the hole in the middle, water and other objects can easily fall into the heating plate, which will affect the cleaning performance and safety performance of the whole machine;

[0009] 3. The spring is in a high temperature and compressed state for a long time, and it is easy to fail, causing the temperature sensor to not be in full contact with the bottom of the inner pot, and it is difficult to ensure accurate temperature at the bottom of the inner pot;

[0010] 4. Within the temperature-resistant range of the rice cooker body, the heating temperature of the rice cooker cannot be increased. For example, the temperature control method of the prior art cannot make the temperature of the rice cooker reach, for example, 120°, 150°, etc.;

[0011] 5. Due to the point temperature control, while using the overall hardware of the rice cooker, it is impossible to achieve continuous temperature measurement and temperature control within the working temperature range

[0012] The above-mentioned prior art only utilizes the sudden change of material magnetism before and after the Curie point to control a temperature point; or, use more expensive sensors to significantly increase the cost of the rice cooker; how to realize a more Wide temperature range and continuous non-contact temperature measurement, so as to realize the temperature control of the rice cooker, and explain from the principle and mechanism, the prior art does not give any inspiration

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