Induction cooker industry overview and analysis of common problems

Induction Cooker (or Induction Cooker) is a cooking device made using the principle of electromagnetic induction heating, and uses a current to generate a magnetic field (on the surface of the burner) through the coil. When the magnetic field lines in the magnetic field pass through the bottom of the iron pan, the magnetic lines of force are cut, and thus There are countless small vortexes, which cause the iron molecules in the iron pan to rotate at high speed and produce food that is directly heated in the pan by frictional heat generation.

About induction cooker

The electromagnetic cooker can be used for frying, frying, stewing, frying, soup, congee, hot pot, etc., even with a baking pan, and a suitable kettle can be used to boil water. widely.

The electromagnetic cooker uses eddy current heating metal pot, no fuel residue and exhaust gas pollution, cookware, stove surface is very clean, after use can be washed with water and a rub. And it is equipped with multiple safety protection measures. It does not leak gas like a gas stove, nor does it produce an open flame.

At the same time, the electromagnetic cooker is economical and efficient, and the heating rises rapidly, which reduces the intermediate steps of heat transfer. The thermal efficiency can reach 80%-92%, while the thermal efficiency of the ordinary gas stove is only about 50%.

According to the State Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Announcement No. 33, 2001, “Product Catalog for Compulsory Product Certification of the First Batch,” China implements the mandatory product certification system for household electromagnetic cooker products under the CCC (abbreviation 3C). Products must be The 3C mandatory certification mark can be sold out. Commercial cooker suppliers can choose to go for a voluntary certification.

In addition, according to the "household electromagnetic cooker energy efficiency labeling implementation rules" and GB 21456-2008 "home electromagnetic cooker energy efficiency limit and energy efficiency rating" requirements, must be attached to the body of the electromagnetic oven body energy efficiency labeling before the factory can be sold. The energy efficiency rating of the induction cooker is divided into 5 levels, of which the most energy-efficient is the 1st level, the medium-level energy consumption is 3rd, and the 5th is the most power-consuming.

According to the classification of stoves, household electromagnetic cookers can be divided into single-head stoves, double-head stoves, multi-pot stoves, and electric stoves.

(1) Single-head cookers are the most common type, and the power is generally 1200W'--2200W, and the household use is the most.

(2) double-head stove, the domestic market has a flat concave and double flat form, the general single-head stove power 2100W, double-head work at the same time not more than 3500W.

(3) Multi-pot stoves, generally two electromagnetic stoves plus one or two far-infrared stoves, the price is relatively high, the current domestic use is not much, and more for open kitchen.

(4) Commercial electromagnetic cookers are generally three-phase 380V power supply, and the power is mainly 3kW-35kW. Its wide application includes frying, frying, deep-frying, boiling, steaming, stewing, boiling, simmering, simmering and the like. Commercial electromagnetic cookers are basically in the market cultivation period, and the market usage is still very small. However, due to its energy saving, environmental protection, and wide use of occasions, the development prospect of such high-power commercial cookers is very good.

(5) An electric gas stove is a combination of an electromagnetic cooker and a gas stove. One stove uses traditional gas and the other stove uses an electromagnetic oven. The user can choose to use according to the situation. This is an emerging product in recent years.

Industry Overview

According to statistics, the number of household electromagnetic cookers in the United States and Europe is relatively large. In Japan, the induction cooker is known as one of the three major appliances of the 21st century, and has grown at a rate of more than 50% annually. In Taiwan, the number of microwave ovens is twice that of microwave ovens.

The electromagnetic cooker has also been in the domestic market for nearly two decades, and it has progressed into a stable development period. In the city, the market for electromagnetic cookers has been relatively high, and the household penetration rate has reached a certain percentage, but there is still much room for development in rural areas. Double-head stoves, multi-head stoves, and commercial induction cookers have developed greatly in recent years, especially for commercial induction cookers. With the development of China's electricity, the renovation of hotel dining kitchens, school canteens, and canteens of enterprises and institutions, development prospects Very broad.

According to statistics, there are about 40 million electromagnetic stoves in the domestic market, and over 100 manufacturers, mainly in the Pearl River Delta and the Yangtze River Delta region, with the most in Shunde and Zhongshan areas in Guangdong Province, both with an annual output of tens of millions Taiwan's large enterprises also have medium-sized companies with an annual output of two to three million units, and the remaining production scale is relatively small.

At present, relevant standards for electromagnetic cookers mainly include: GB 4706.29-2008 "Special requirements for safe portable cookers for household and similar electrical appliances", GB 4706.14-2008 "Safety grills and bread roasters for household and similar electrical appliances" Special requirements for portable cooking appliances for similar and similar purposes, GB 4706.22-2008 "Special requirements for standing electric ovens, cooktops, ovens and similar appliances for the safety of household and similar electrical appliances", GB 4824-2004 "Industrial, scientific And Medical (ISM) RF Equipment Electromagnetic Disturbance Characteristics Limits and Measurement Methods, etc.

Common main issues

In recent years, the General Administration of Quality Supervision, Inspection and Quarantine has organized many inspections and inspections of induction cookware products. The qualified rate of products is high, but a small number of products mainly have the following problems in electrical safety and energy efficiency labeling. Consumers purchase and use Can be taken seriously:

1. Signs and instructions

The appliance lacks the type and necessary parameters such as the rated voltage, frequency, rated power, etc.; lacks the position mark or pattern of the heating part on the table, lacks a warning to avoid accidental burns; etc.; the manual lacks related warnings or lacks maintenance instructions Etc.; related signs and descriptions do not use Simplified Chinese; related marks are easily curled or damaged and do not meet the requirements of being clear and easy to understand and durable.

2. Protection against touching live parts

The shell of the appliance does not function well. IEC 61032's type B test probe (simulated human finger) can touch live parts through the appliance's grille and openings; Type 13 test probe of IEC 61032 (simulation Children use thin metal rods to access live parts through the openings in the appliance's structure; these problems can easily cause consumers to experience electric shock during use.

3. Abnormal work

Abnormal protection circuit design on the appliance is irrational. When the product fails, the power supply cannot be cut off in time. This results in excessive heat, which may cause damage to the housing and even cause electric shock or fire.

4. Mechanical strength

The quality of the appliance housing heat sink grid material is not reliable or the design is unreasonable. It is damaged after being subjected to 0.5J energy impact test. The TEC 61032 B type test probe (simulated person's finger) can enter the interior of the appliance through the damaged part to the consumer. There are hidden dangers of electric shock; the panel of the appliance is ruptured after a drop test, and it cannot withstand the electric strength test of section 16.3 of the standard, and there is a hidden danger of electric shock.

5. structure

After the appliance is connected to the power supply, only the switch key is touched once, and the appliance enters the heating work, which may easily cause misoperation and cause danger.

6. Energy efficiency rating

The actual thermal efficiency (energy efficiency) of the device has exaggerated the phenomenon of false marks and misled consumers. The main reason is: After the company is certified, the mass produced products have a large gap with the certified prototype in terms of quality; in actual production, blindly reduce the production cost and use low-quality and low-cost components, such as the use of ordinary glass instead of the original micro Crystal glass can reduce the cost and cannot meet the safety and performance requirements for design or certification.

Purchase and use tips

Safety is the first element of consumer purchase. Therefore, consumers must check whether the product has a 3C accreditation mark and check whether there is an energy efficiency rating label. If the product is labelled with energy saving and exemption marks, it is more reliable. , also consider the following elements.

1. power

The power of the electromagnetic cooker on the market is generally 800W-2200W, and is divided into several files. The greater the power, the faster the heating and the higher the selling price. According to the number of diners and the use of the purchase may be determined. In general, three-person households can use around 1300W cookers.

2. Furnace appearance

Most of the surface of the electromagnetic oven sold in the market is made of a heat-resistant crystallized ceramic. At the time of purchase, pay attention to the flatness of the furnace surface. If the furnace surface has convex or concave or a side tilt, it will affect the normal production of thermal efficiency. High-quality electromagnetic stoves are made of high-quality materials, and their characteristics are: milky white, opaque, and the printed pattern on the touch panel has a distinct bump. In addition, we must pay attention to the electromagnetic cooker stove, side, bottom, etc. can not be bump or scratches, decorative patterns should be clear, the fastening screws can not be loose parts.

3. Automatic detection function

The automatic detection function is the automatic protection function of the electromagnetic oven. For the electromagnetic cooker, the function of this function is very important. At the time of purchase, the following methods can be used to detect: When the cooker is working, remove the cookware, or place a small utensil such as an iron spoon on the surface of the cooker to observe if there is an alarm or cut off the power automatically.

4. Check protection function

The electromagnetic stove with protection function should have multiple protection devices, including small object detection, overheating automatic shutdown protection, over-voltage or under-voltage automatic shutdown protection, air-burning automatic stop heating protection, 2h power-off protection, 2min automatic shutdown protection and sound Light alarm display. When purchasing, you should press the "Instruction Manual" on the detection method, power test machine to see if its protection function is working properly.

5. fan

Since the electromagnetic cooker generates a large amount of heat during operation, the built-in fan functions as a ventilation system, and its ventilation effect is very critical to the operation of the electromagnetic cooker. A good electromagnetic cooker generally adopts a DC cooling fan, which has good heat dissipation and low noise and helps to prolong the operation. Service life. When the electromagnetic cooker is not working, it can be turned over and shaken to observe. There should be no gap between the fan blades and the shaft, the shaft and the bearing, and no looseness; after the power is turned on, the motor should have no obvious noise or friction sound, and the rotation of the fan blade. Should be stable.

6. Detect electrical performance

Detecting electrical performance Add 0.5kg cold water to the matching pot, turn on the power, press the "heat" button, and heat it at room temperature for 4-5 minutes, indicating that the heating of the cooker is normal. When the water boils, listening carefully should only hear a slight fan motor sound, there should be no abnormal noise or vibration. Finally, unplug the power plug and touch the power plug by hand for room temperature or slightly lukewarm, indicating that the electrical performance of the cooker is good.

7. Service

In the purchase of electromagnetic ovens, in addition to understanding the quality of products, after-sales service is also very important, professional cooker brands should establish an independent customer service center in the local, and provide a written commitment to the sale. Therefore, it is recommended that consumers purchase professional-brand induction cooker products from regular stores.