Induction cookers are popular in Europe and the United States for their environmental protection, cleanliness and energy conservation. In some developed countries, the penetration rate has surpassed the popularity of Chinese families. At present, the induction cooktop panel at home and abroad is a flat structure. This panel is only suitable for cooking in pans, and is not suitable for round (tip) bottom pans for Chinese cooking. Does not meet the Chinese cooking habits, has certain limitations.

According to the characteristics of the Chinese cooking pot as a round (point) bottom, the research group redesigned the induction cooker coil and panel, and successfully developed a “high-efficiency energy-saving electromagnetic generation suitable for round bottom pans or pans. This phenomenon is also suitable for the spatula. The situation near the airflow.

In (b), I is larger, F is smaller, the thermal motion of the airflow is not affected by the key, the gas rises upward, and the macroscopic wall effect does not occur.

The water molecules are mostly multi-molecular, the mass is m, the gravity constant is g, then the water flow self-falling gravity f is much larger than the gimbal gravitational force G: In (c), the spatula is located in the water flow, and the water molecules are in gravity and Under the action of the viscous force on the surface of the spoon, descending along the surface of the spoon, this phenomenon is also suitable for the case where the recess of the spoon is located in the water flow.

In (d), although the water flow is also adjacent to the spoon like the air current, the gravitational attraction of the water molecule is much smaller than the gravity of the water molecule, so the water flow cannot be adsorbed.

5.2 Analysis of the wall effect of the air amplifier (a) is a schematic diagram of the air amplifier, which is combined with (a) for analysis: (a) the inner lower ring represents the annular air gap, and the cylindrical cavity represents the air cavity. When the externally input compressed air is rushed out of the air gap, it is affected by the air gap structure and upwards. The tubular airflow is formed by the restraint of the air cavity wall and the Coanda effect. After the tubular airflow leaves the air cavity, the air cavity wall restraint and the Coanda effect Disappearing, a tapered cavity can be formed, and the conical cavity airflow and the tubular airflow together form a hollow shell-shaped negative pressure zone as shown in (b); the negative pressure zone is equivalent to a negative pressure pump for pumping gas, and is strongly sucked The smoke below the bottom forms a solid-walled helium column without a top cover as shown in (c) in the air chamber of the air amplifier. Obviously, the amount of smoke smoke is much greater than the amount of compressed air input, and the air is amplified. The amount of suction is proportional to the input pressure and the circumference of the air gap.

5.3 New solution to the wall effect of the air amplifier The input gas is subjected to pressure and the gravitational force with the wall of the air chamber, and flows along the wall of the air chamber to one end of the air chamber to form a negative pressure zone, several times or even tens of times the suction air chamber. The gas outside the other end causes the amount of gas to be amplified. 6 Summary The existing range hood has three major defects, low efficiency, high noise, easy to foul, time and facts have been confirmed, these three major defects are intrinsic, namely: the motor and impeller set in the smoke chamber, It will hinder the emission of soot and cause the efficiency of the fume to be low; it will disturb the soot fluid and cause wind noise; it will adsorb the soot and cause the dirt. The air amplifier, especially the self-blocking air amplifier, is used as the core component of the range hood. The development of the range hood with no motor impeller in the smoke chamber can avoid the three defects of the existing range hood and realize the core of the no-motor impeller of the smoke chamber. The components are air amplifiers, especially self-blocking air amplifiers. The working mechanism of this component is the Coanda effect, and the existing Coanda effect theory does not take the gravitational theory to explain the Coanda effect of gas and liquid in the air amplifier. .

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