High-frequency heating device

1. A high-frequency heating device, comprising a housing, a thermal insulation sleeve, a magnetic induction coil, a variable-frequency power supply, and a battery;

wherein

the housing comprises a central through hole and an enclosure surrounding the central through hole;

the housing further comprises a first lateral portion and a second lateral portion opposite the first lateral portion; the central through hole is disposed between the first lateral portion and the second lateral portion;

the first lateral portion comprises a first cavity and the magnetic induction coil is disposed in the first cavity; the thermal insulation sleeve is fixed in the magnetic induction coil; when in use, a neck of a hookah passes through the central through hole, and a heating cup containing tobacco material is disposed around the neck; the enclosure is disposed around the heating cup so that the high-frequency heating device is able to heat the tobacco material in the heating cup;

the variable-frequency power supply is disposed in the housing;

the second lateral portion comprises a second cavity; the battery is disposed in the second cavity; and

an output end of the battery is connected to an input end of the variable-frequency power supply; an output end of the variable-frequency power supply is connected to the magnetic induction coil; when in use, an alternating current output by the variable-frequency power supply flows through the magnetic induction coil whereby an induced magnetic field is produced.

2. The high-frequency heating device of claim 1 , further comprising a temperature difference sensor, wherein the temperature difference sensor is connected to the variable-frequency power supply and is disposed in an opening of the thermal insulation sleeve to sense a temperature change of an air flow, so as to control the variable-frequency power supply whether or not to enter an automatic heating working mode.

3. The high-frequency heating device of claim 2 , further comprising a thermistor, wherein the thermistor is connected to the variable-frequency power supply and is located in an inner wall of the thermal insulation sleeve for over temperature protection; when a working temperature reaches a maximum of 600° F., no current is output from the variable-frequency power supply, and the high-frequency heating device stops working.

4. The high-frequency heating device of claim 3 , further comprising a sliding button and a manual button, wherein the manual button is connected to a second contact terminal on the variable-frequency power supply to switch on the power supply to heat the tobacco material; the sliding button is connected to a third contact terminal on the variable-frequency power supply and is exposed out from a side wall of the housing; when in use, the working mode of the high-frequency heating device is switchable by pressing the sliding button so as to heat different tobacco materials.

5. The high-frequency heating device of claim 1 , wherein when the high-frequency heating device is in use with the heating cup and the hookah, the heating cup is disposed around the neck of the hookah; a diameter of the heating cup is corresponding to that of the central through hole of the housing, so that the thermal insulation sleeve is disposed around the heading cup.

6. The high-frequency heating device of claim 1 , wherein the heating cup comprises glass and a metal inlaid in the glass, and has a frosted surface.

7. The high-frequency heating device of claim 5 , wherein the hookah further comprises a nozzle disposed on a top of the heating cup for air admission.

8. The high-frequency heating device of claim 7 , wherein in a power on state, the heating cup is heated in an induction magnetic field formed by the magnetic induction coil, so that the tobacco material in the heating cup is heated to produce vapor or smoke; air enters the heating cup via the nozzle, and an internal temperature in the heating cup varies; the temperature difference sensor senses a change of temperature in the air flow and controls the variable-frequency power supply to work in an automatic heating mode; the air drives the vapor or smoke in the heating cup to submerge in water in the hookah, and the vapor or smoke is filtered in the water and discharged out of an exit for user's inhaling.