Electric heater

Abstract

The invention discloses an electric heater. The electric heater comprises a base, a shell and a heating unit, wherein the shell is arranged on the base; the bottom wall, the sidewall and the top wall of the shell are provided with through holes respectively; the heating unit is arranged inside the shell; the outer surface of the sidewall of the heating unit is provided with a far infrared radiation coating and has a preset distance from the inner surface of the sidewall of the shell; a hollow passage penetrating the heating unit along the vertical direction is arranged inside the heating unit; an upper opening of the hollow passage is opposite to the top wall of the shell; the lower opening of the hollow passage is opposite to the bottom wall of the shell. According to the electric heater of the embodiment of the invention, the outer surface of the sidewall of the heating unit is provided with the far infrared radiation coating so that some warm air can be transmitted outwards in a radiation manner by passing through the sidewall of the shell; some warm air is transmitted in a convection manner by passing through the top wall of the shell through the hollow passage; the radiation area is wide and uniform radiation is realized.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to an electric heater. Background technique [0002] At present, electric heaters on the domestic and foreign markets mainly include the following types: 1. Convection heaters; 2. Visible light radiation heaters, such as far-infrared heaters and small suns; 3. PTC heaters; 4. , Electric heating oil. [0003] The above first to third types of electric heaters can only dissipate heat on one side or both sides, which cannot meet the heating needs when many people sit around. Among them, the convection electric heater generally has an air outlet on the top and an air inlet on the bottom. The hot air flows out from the air outlet, and the surrounding cold air enters and replenishes from the air inlet. This cycle is repeated, so as to realize the natural convection heating of the indoor air. However, because the area of ​​the air outlet provided above is generally small, th...

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Problems solved by technology

[0003] The first to third types of electric heaters above can only dissipate heat on one side or both sides, which cannot meet the heating needs of many people sitting around

Among them, the convection electric heater generally has an air outlet on the top and an air inlet on the bottom. The hot air flows out from the air outlet, and the surrounding cold air enters and replenishes from the air inlet. This cycle is repeated, so as to realize the natural convection heating of the indoor air. However, since the area of ​​the air outlet on the top is generally small, there is a disadvantage that the thermal sensation is not strong

When the far-infrared electric heater and the small sun are working, that is, after the heating element is energized, it radiates heat in the form of light or far-infrared, and reflects and diverges to the outside through the reflector. The disadvantage is that there is visible light, forming light pollution, and for directional heating. small heating area

The PTC heater uses the fan to agitate the air to flow through the PTC electric heating element to force the air convection to dissipate heat. It mainly has the following disadvantages: there is noise during operation, there is a sense of wind, it is easy to dry, and the heat dissipation range is small.

[0004] The heating principle of the electric heating oil heater is that the metal cavity of the body is filled with heat-conducting oil, and the electric heating element is immersed in the heat-conducting oil. The heat conduction oil conducts to the inner wall of the shell, and dissipates the heat from the shell to the surroundings. The heat transfer method is mainly heat conduction, which has the following disadvantages: when heating the heat conduction oil, the preheating time is long, the temperature rises slowly, and the processing technology is not good. There is a possibility of oil leakage

Moreover, there are only electric heating tubes on the front and back sides. Strictly speaking, it can only be regarded as double-sided heat dissipation, not multi-sided heat dissipation.

The electric heating tube is tubular, and the heat is reflected by the reflector, which will cause the heating tube to be locally heated, while the rest of the area is not hot, and the heat dissipation is not uniform enough.

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