CN2750243Y - Electric fan - Google Patents

Abstract

An electric heating fan belongs to the technical field of household appliances and electric heating; the core technology is that an electric heater installed in an electric fan is composed of a plurality of ceramic-based electric heating sheet units. The ceramic-based electric heating sheet unit is characterized in that a resistor and electrode slurry are silk-screened on the surface of a high-quality ceramic sheet containing aluminum trioxide, and a resistor and an electrode film are formed on the surface of the ceramic substrate through high-temperature sintering; two ends of the ceramic-based electric heating sheet unit are fixedly connected with the mica heat insulation plate, and a connecting lead is led out; the ceramic-based electric heating sheet units can be combined into electric heaters with different cross-sectional shapes, such as square, triangle, hexagon, curtain and the like; the ceramic substrate unit can generate far infrared rays in a heating state, and the far infrared rays can directly promote skin blood circulation; the surface of the ceramic wafer is strongly rubbed by high-speed hot air to generate negative ions, and the negative ions are beneficial to beauty and health. The electric heating fan of the utility model can be used as an electric hair drier for beauty and a fan heater for household heating, etc.

Description

Electric fan

technical field

The utility model relates to the technical field of electric heating, in particular to the improvement of the structure of the electric heater of the electric heating fan. The device of the utility model can be used as an electric hair dryer for beauty treatment and as a heater for home heating.

Background technique

The currently widely used electric heating fans, such as hair dryers for drying hair and heaters for heating in winter, generally use nickel-chromium alloy resistance wires wound on the mica support as electric heaters. Figure 1 is an existing electric heater. Schematic diagram of the internal structure of the hair dryer, in which the electric heater is wound by a nickel-chromium alloy resistance wire. Developers have made a lot of efforts to reduce noise through different winding methods of resistance wires. Figure 2 shows several common winding forms of resistance wires in existing hair dryers. Figure 2A is a coil type, Figure 2B is a triangle type, and Figure 2C is a long arc form. While some winding forms are effective at reducing noise, their potential for noise reduction is very limited. To sum up, the existing electric heating fan has the following defects:

1. The distribution of resistance wires is long, occupying a large space, and the support is complex, causing large wind resistance and resulting in large noise;

2. It is easy to cause uneven winding of the resistance wire, resulting in excessive local temperature, which makes people feel extremely uncomfortable when used as a hair dryer, and the high local temperature also makes the resistance wire easy to oxidize and break, shortening the service life of the electric heater;

3. The resistance wire mainly emits visible light, so the existing electric heater cannot have a physiotherapy effect;

4. The resistance wire will emit light, and the efficiency of electrothermal conversion is not high, which wastes energy.

Contents of the invention

Aiming at the defects of the existing electric heating fan, the utility model proposes to adopt an electric heating fan with low noise, uniform heating and certain physiotherapy effect.

The technical solution adopted in the utility model is that the electric heater of the electric fan is composed of multiple ceramic-based electric heating sheet units, so the electric fan of the utility model includes: a casing with an air inlet and outlet, a fan, a control switch, Power leads and electric heaters consisting of multiple ceramic-based heater elements.

The ceramic-based electric heater unit is a new type of electric heater formed by attaching a layer of resistance film on the surface of the ceramic substrate. The ceramic substrate can be a high-quality ceramic sheet containing aluminum oxide, with a thickness of 0.6-0.8 mm. The resistance film is formed by screen-printing circuit board-shaped resistance paste on the surface of the ceramic substrate. The coefficient of thermal expansion of the resistance paste is very close to that of the ceramic substrate, and then sintered at high temperature.

Both ends of the ceramic-based heating element are fixedly connected to the heat shield. After the lead wires are connected, multiple ceramic-based heating elements can be combined to form electric heaters with different cross-sectional shapes and installed in the electric fan. According to different product requirements, the ceramic-based electric heater unit is electrically connected to the control switch and the electronic circuit in series or in parallel.

Compared with the prior art, the electric heater fan of the utility model has the advantages of simple structure, large heat dissipation area of the electric heater, small wind resistance, balanced heat generation, high thermal efficiency, small space occupation, and easy installation. If the device of the utility model is applied to a hair dryer and a heater, the following beneficial effects can be produced:

1. Due to the small wind resistance and smooth ventilation, the fan speed can be reduced, so the noise is also reduced;

2. Due to high electrothermal conversion efficiency and low fan power, energy consumption is saved;

3. The circuit board-shaped resistance film formed by sintering the resistor and electrode paste on the surface of the ceramic substrate has good consistency, uniform temperature distribution and long service life;

4. Friction between the ceramic substrate in the heating state and the fast-flowing air can generate far-infrared rays, which can directly promote skin blood circulation and have physical therapy effects;

5. The high-speed hot air strongly rubs against the surface of the heating ceramic substrate, and can also generate negative ions, which is helpful for beauty and health.

Description of drawings

Fig. 1 is the internal structure schematic diagram of existing hair dryer;

Fig. 2 is several common winding forms of the resistance wire of the existing hair dryer;

Fig. 3 is the exterior view of the ceramic base electric heater unit that the utility model adopts;

Figure 4 is the appearance diagram after the two ends of the ceramic-based electric heater unit are fixedly connected with the heat shield, and the lead wires are connected;

Fig. 5 is the electric heater in the electric heating hair dryer that implements the present utility model, adopts the schematic diagram of the electric heater with different cross-sectional shape to be combined into the electric heater of multi-chip ceramic base unit;

Fig. 6 is a schematic diagram of the electric heater in the electric heating hair dryer implementing the utility model, which adopts four ceramic-based electric heating chip units to form a square electric heater with a cross-sectional shape.

Detailed ways

Further description will be made below in conjunction with the preferred embodiment shown in the accompanying drawings.

As shown in Figure 3, on the surface of a high-quality ceramic substrate 2 with a thickness of 0.6 to 0.8 mm and containing aluminum oxide, circuit board-shaped resistors and electrode pastes are screen-printed, and the coefficient of thermal expansion of the resistors and electrode pastes is related to that of the ceramic substrate. 2 are very close, and then sintered at a high temperature, a circuit board-shaped resistance film 3 is formed on the surface of the ceramic substrate 2, which is the ceramic-based heater unit 1, which is a new type of heater.

As shown in Figure 4, the two ends of the ceramic base heater unit are fixedly connected with the mica heat shield 4, and then lead out the connecting wire 5; the mica heat shield 4 acts as a mounting bracket, and can be combined by multiple ceramic base heater units 1 into different shapes of electric heaters.

Figure 5 is a schematic diagram of electric heaters with different cross-sectional shapes combined from multiple ceramic-based electric heater units installed in a hair dryer. For example, four ceramic-based electric heater units can be combined to form a cylindrical electric heater with a square cross-sectional shape (Fig. 5A), or a cylindrical electric heater with a triangular cross-sectional shape (Fig. 5B) composed of three ceramic-based electric heating elements, or a hexagonal cylindrical electric heater (Fig. 5C) and a curtain type Cylindrical electric heater (Figure 5D) and so on.

FIG. 6 is a perspective view of a tubular electric heater 6 with a square cross-sectional shape corresponding to FIG. 5A . The square tubular electric heater 6 shown in Fig. 6 is applied in the blower, then the blower includes a casing with an air inlet and outlet, a protective net cover, a fan, an electric heater, internal wiring, a control switch, power lead wires and the like. The fan is installed in the casing close to the air inlet, the electric heater is installed between the fan and the air outlet, the air inlet and outlet are equipped with protective nets, the handle of the casing is equipped with a control switch, there are internal wiring inside the casing, and external power leads.

Its working principle is as follows: In the energized state, the linear resistance film first generates heat and heats the ceramic substrate. The heated ceramic substrate emits infrared rays and heats the air flowing through it. The heated gas is installed in the inlet The forced airflow generated by the fan inside the tuyere is blown out of the tuyere. Thus, higher electrothermal conversion efficiency and smaller wind resistance can be obtained.

Claims (9)

1. An electric heater, comprising a casing with an air inlet and outlet, a fan, an electric heater, a control switch, and a power lead, characterized in that: the electric heater is an electric heater containing a ceramic-based electric heater unit (1) (6). 2. The electric heating fan according to claim 1, characterized in that: the electric heater (6) comprises one or more than one piece of ceramic-based heating element (1) and a bracket for installing the ceramic-based heating element (1) Heat shield (4). 3. The electric heating fan according to claim 1, characterized in that: the ceramic-based electric heater unit (1) is provided with a layer of resistance film (3) on the surface of the ceramic substrate (2). 4. The electric heater according to claim 3, characterized in that: the ceramic substrate (2) is a high-quality ceramic sheet containing alumina. 5. The electric heating fan according to claim 3, characterized in that: the thickness of the ceramic substrate (2) is 0.6-0.8 mm. 6. The electric heating fan according to claim 3, characterized in that: the resistance film (3) is formed by silk-screening resistance and electrode paste on the surface of the ceramic substrate unit (1) and sintering at high temperature. 7. The electric heating fan according to claim 2, characterized in that: the heat insulation board (4) is mica. 8. The electric heating fan according to claim 1 or 3, characterized in that: the electric heater (6) includes a cross-sectional shape composed of multiple ceramic-based electric heating sheet units (1), which is square, triangular, or hexagonal Type and curtain type cylindrical electric heater. 9. The electric heater fan according to claim 1 or 3, characterized in that: the multi-piece ceramic-based heater unit (1) is electrically connected to the control switch and the electronic circuit in series or in parallel.

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