rice cooker

The history of cooking can be traced back to the prehistoric era, and the use of electric rice cookers to cook began after World War II.

After the defeat of Japan, some factories of Mitsubishi, a major military fire merchant, turned to civilian goods. In the late 1940s, Mitsubishi developed an electric rice cooker, which was actually a cooker with an electric heating device. Due to its lack of automation and the need for real-time care, this kind of cooker was very unsuccessful. Panasonic and Sony have also developed similar pots without success.

Before Christmas in 1956, Toshiba trial produced 700 electric rice cookers with the so-called "timing function". The timing principle is to add water to the outer pot to control the heating time. When the water in the outer pot evaporates, the heating stops, and the rice in the inner pot is also cooked. Toshiba adopted door-to-door marketing, and the promotion of rice cookers was successful. One month later, Toshiba produced 200000 rice cookers. Four years later, half of Japanese families bought this kind of pot. Nine years later, this timing design was replaced by other timing designs. New electric rice cookers generally have a temperature control device installed at the bottom of the outer cooker. Before the temperature of the inner pot reaches 100 degrees Celsius (212 degrees Fahrenheit), the heating device works at full capacity. The temperature of the inner pot will exceed 100 ℃ until the excess water in the pot is absorbed and evaporated by rice. At this time, the temperature control device will stop the heating device, or turn to the heat preservation state of about 65 degrees Celsius (150 degrees Fahrenheit). This invention reduced the time and manpower that many families spent on cooking.

The electric rice cooker is mainly used as a daily kitchen appliance for cooking. The electric rice cooker is used for cooking without fire, which is safer than cooking with open fire. With the increase of the functions of electric rice cooker, in addition to basic cooking, it also includes porridge, stew, steamed vegetables and snacks. The electric rice cooker is still developing and has the function of baking cakes, while those in Britain and other places can fry French fries.

In 2005, the output of rice cookers in the world was 85 million, of which the output of mainland China was about 60 million, and the rest came from Japan and South Korea. As the main place of origin of rice cookers in mainland China is Guangdong, rice cookers are gradually replaced by Cantonese rice cookers in Mandarin.

The electric rice cooker is generally composed of a pot body, electric heating elements, temperature control and timing devices.

① Pot body:

There are two layers inside and outside or three layers inside, middle and outside. The inner pot body is used to hold the food to be cooked, and is usually made of aluminum alloy, enamel or stainless steel. Its inner surface is coated with polytetrafluoroethylene to prevent food sticking to the pot; The outer pot body plays the role of safety protection and heat preservation. It is generally made of thin steel plate, and the surface is painted or enameled. The inner and outer layers of the pot can be air sandwiches or filled with thermal insulation materials. The three-layer pot body is a medium pot body added between the inner and outer two layers of the pot body to form a steaming pot and play a double heat preservation role.

② Electric heating element:

It is usually a metal tube type, mostly cast in an aluminum hot plate, and the heat emitted is evenly heated to the bottom of the inner pot through the hot plate. Generally, rice cookers are only equipped with one bottom electric heating element. In order to obtain better cooking effect, some high-grade products are equipped with 2~4 electric heating elements, which are respectively used as the top cover heater and side heater, and the power can be divided into multiple levels.

③ Temperature control and timing device:

The temperature control device commonly used on ordinary rice cookers is generally composed of a temperature limiter and a thermostat. The former will not increase/increase the boiler temperature beyond a certain value (usually 103 ± 2 ℃) and is installed at the cavity in the center of the heating plate; The latter increases/increases the temperature of the cooked food in the pot to 60~80 ℃, which is installed under the heating plate or other appropriate positions. Since the 1980s, timers have been increasingly used in rice cookers, mainly clockwork mechanical timers.

New drum type commercial large capacity rice cooker

One piece forming structure: one piece stretching strengthens the pot body, five foot support strengthens the middle layer structure, which makes the whole more solid and more resistant to damage and deformation.

Tank: thickened encryption alloy tank; Firm and not easy to deform; Widen shallow bottom capacity design makes cooking faster and more uniform.

Heating plate: the thickness of the specially made aviation aluminum widened and thickened heating plate is 120mm, which is thicker than the ordinary heating plate, more resistant to high temperature, and more uniform and fast heating; Longer service life and more supportive quality.

Pot cover: Thickened stainless steel pot cover, new handle design is more elegant.

Power line: scientific and safe line displacement design, use 1.5 mm2 pure copper silica gel internal wiring, high-quality temperature controller, special safety insulation protection at each line connector, safe, power saving and efficient.

(1) Heating forms include:

① The indirect heating electric rice cooker is composed of three layers: inner cooker, outer cooker and cooker body. The inner pot is used to hold food, and the outer pot is used to install electric heating elements, temperature regulators and timers. These electrical components are fixed and installed on the outer pot as a whole and sealed. The outer layer is the pot body, which plays a dual role of safety protection and decoration. The advantages of the electric rice cooker are: the food is heated evenly, the upper and lower portions of the rice are hard and soft, the inner pot can be taken off, and the cleaning is convenient; Disadvantages: complex structure, time consuming and power consuming

② Direct heating electric rice cooker: This electric rice cooker is characterized by that the electric heating element directly heats the inner pan for food when in use. Unlike the indirect heating rice cooker, the electric heating element heats the water in the outer cooker into steam, which then heats the food in the inner cooker. Therefore, it is highly efficient, time-saving and power saving. The disadvantage is that the food made is easy to be inconsistent.

2. In terms of structural form:

① The combined electric rice cooker is not firmly connected with the electric heating seat. The cooker can be easily removed when it is placed on the electric heating seat, which is convenient for cleaning, and can also be placed on other heating bodies or tables

② The electric heating element of the integral rice cooker is directly fixed at the bottom of the cooker body, and the whole cooker forms a whole. Due to the different structure of the whole electric rice cooker, it can be divided into three types: single-layer electric rice cooker, double-layer electric rice cooker and three-layer electric rice cooker.

3. According to the control mode:

① Heat preservation type: press the power switch when cooking, and the power will be automatically disconnected after the meal is cooked. When the temperature drops to below SMArttags "/>PE=" 1 "TCSC=" 0 "w: st=" on ">65 ℃, the heat preservation switch will be connected to the circuit again, and when the temperature rises to 65 ℃, the power will be automatically disconnected, so that the purpose of heat preservation can be achieved by alternately switching on and off.

② Start the heat preservation type regularly. After the rice and water are put in the pot, turn on the timer switch and start cooking at any time within 12h. After cooking, it can automatically keep warm and save energy.

③ Computer controlled, using computer program control, so that the electric cooker work automation program is higher.

The body of the electric rice cooker is made of ceramic, enamel, aluminum alloy and stainless steel. The inner wall of the inner pot is usually sprayed with a layer of Teflon anti coke coating to make it difficult to paste when cooking and easy to clean.