Rice cooker, also known as electric cooker, rice cooker.It is a cooking utensil that uses electrical energy to be transformed into a thermal energy. It has a variety of operating functions such as steaming, cooking, stewing, pot, and crickets of food. It is convenient, safe and reliable.It can not only cooked food, but also heat up, clean and hygienic, without pollution, saving time and effort, is one of the indispensable utensils for housework and labor.The common rice cookers during World War II were divided into three categories: insulation automatic type, timing insulation, and new micro -computer control.
What is the working principle of the rice cooker
The main structure of ordinary rice cookers is composed of heating discs, temperature limiters, insulation switches, leverage switches, current -limiting resistors, indicator lights, sockets, etc.
Heating plate
This is the main heating element of rice cookers.It is an aluminum alloy disk with an internal electric heating pipe. The inner pot is placed on it, and you can see the inner pot.
Temperature limit
Also called magnetic steel.It is equipped with a permanent magnetic ring and a spring, which can be moved and located in the center of the heating plate.When cooking, press the cooking switch, drive the leveraged switch by the absorbing power of the magnetic steel to keep the power contact connect. When the cooking of the rice bottom, the temperature of the bottom of the pot continues to rise.When weakened, when the water in the inner pot is evaporated and the temperature of the bottom of the pot reaches 103 ± 2 ℃, the absorption power of the magnetic ring is smaller than the elasticity of the spring on it.Essence
Insulation switch
Also known as the thermostat.It is composed of a spring piece, a pair of normally closed contacts, a pair of frequent open contacts, and a dual metal piece.When cooking, the temperature in the pot rises. Due to the different thermal expansion rate of the two metal slices that constitutes the dual metal slices, the dual metal slices are curved upwards.When the temperature reaches above 80 ° C, driven by the bending dual metal sheet, the spring chip drives the conversion of the frequent opening and the normal closed contact, thereby cutting the power supply of the heating pipe and stopping heating.When the temperature in the pot drops below 80 ° C, the dual metal slices gradually cool down and recover, and the frequent opening and normally closed contacts are converted again.Repeat this, that is, the thermal insulation effect is achieved.
Leverage switch
The switch is completely a mechanical structure, and there is a frequent opening contact.When cooking, press this switch to connect the power supply to the heating pipe, and the power supply light is light up to light up the heating indicator.When the meal is good, the temperature limit is played, driving the leveraged switch to break the contact.Since then, the heating pipe is only controlled by the thermal insulation switch.
Restricted resistance
The appearance is golden or white, and the size of the 3W resistance is pressed between the heating pipe and the power supply, which plays a role in protecting the heating pipe.The commonly used current limit resistance is 185C 5A or 10A (depending on the power of the rice cooker).The current -limiting resistance is a key component to protect the heating tube, and cannot be replaced by wire.
Rice cooker buying skills
Because the function of rice cookers is obviously different from other pots, it is very suitable for the living habits of modern people -fast, convenient, and multi -purpose requirements, and its market potential is huge.Zhiyan Consulting shows that after a round of market reshuffle, by the end of 2010, the rice cooker brand in the domestic market is about 150, and the rice cooker is a more practical cooking appliance.It has an advantage that other cooking appliances cannot compare and can meet various cooking needs. Therefore, the future development prospects of rice cookers are very optimistic, and the market space is great. It is a product worth developing.There are many types of rice cookers and brands on the market.In this case, how should consumers choose?
First of all, according to your own economic strength, you must choose some excellent brands of products. Good brands do well in high -quality services and after -sales guarantees, which can make consumers feel assured.
Secondly, you can choose a variety of functions with a variety of functions. This can not only save expenses, but also use home space.The rice cooker not only has the function of cooking, is proficient in porridge and soup stew, and can also make cakes. There are also some pressure cookers to cook chicken without water.
As a rational consumer, when choosing a rice cooker, you should also consider its health problems. There are many rice cookers with purple sand inner lined in the store.Superiority, and no harmful substances during cooking heating, purple sand is also rich in various minerals that benefit human health.
The most important thing for choosing a rice cooker is the safety issue. When buying, you must check whether the product has a 3C logo, including the plug and power cord, you should also have this logo. Then check the product manual. The regular instructions should be printed with product names, trademarks, and trademarks, andModels, rated voltage, frequency, power, manufacturer or seller, the instruction manual is clearly printed, manufacturers, addresses, telephones, and maintenance matters should be clearly indicated. It should also be equipped with a warranty card, a box installation accessories, and a factor -qualified certificate.In addition, it is necessary to check whether the power cord is dual -layer insulation and whether the wire core is greater than or equal to 0.75 square millimeters.
After checking the above matters, you must choose the appearance of the rice cooker. It is best to observe whether the appearance is scratched, deformed, or not in different angles.Whether the layer will fall off, and the coating of the falling may be carcinogenic. The products produced by regular manufacturers basically prevent this problem, but it is still necessary to check it clearly.
Then use your hand to touch the function button a few times to see if the magnetic steel suction is good. Under normal circumstances, press it, and when you pull it up, there is a crisp "click" sound.When the indicator light is turned on, he heats the plate with your hands to feel whether it is hot.

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