Shisha Device RF Dielectric Heating Uniformity

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Solution Overview

Problem

Traditional electrically operated shisha devices often suffer from non-uniform heating of the aerosol-forming substrate, leading to inefficiencies and design limitations, as the portion closest to the heating element is heated more quickly or to a higher temperature than the rest.

Innovation Solution

A shisha device employing a radio frequency (RF) electromagnetic field generator for dielectric heating, which provides uniform heating without the need for direct contact and allows for greater design flexibility, using a solid state RF transistor for compactness and efficient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional electrical heating elements are used to heat the aerosol-forming substrate, then heating can be achieved, but non-uniform heating occurs with hot spots near the heating element

Engineering Contradiction:

Improveheating uniformityVSAvoidtemperature distribution uniformity

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent replaces conventional electrical resistance heating elements with radio frequency (RF) electromagnetic field heating. This substitution eliminates direct contact between heating elements and the aerosol-forming substrate, thereby eliminating hot spots and achieving uniform heating throughout the substrate volume.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the heating mechanism from low-frequency electrical resistance heating to high-frequency radio frequency electromagnetic heating. This parameter change in heating frequency and method enables dielectric heating of the entire substrate volume simultaneously, resulting in uniform temperature distribution.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If charcoal is used to heat the shisha substrate, then heating is achieved, but full or partial combustion of the substrate occurs

Engineering Contradiction:

Improveheating capabilityVSAvoidcombustion of substrate

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The patent replaces charcoal combustion with radio frequency electromagnetic field heating. This substitution provides precise temperature control that heats the substrate to the required temperature without reaching combustion points, thereby eliminating harmful combustion byproducts.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If electrical heating elements are used, then heating control is achieved, but residue buildup on the heating element occurs

Engineering Contradiction:

Improveheating controlVSAvoidcleaning requirement

Core Design Contradiction:

Ease of operationVSEase of repair

Solution Approach 1:

The patent replaces contact-based electrical heating elements with non-contact radio frequency electromagnetic field heating. Since there is no physical heating element in contact with the substrate, residue buildup is eliminated and cleaning requirements are removed while maintaining heating control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Manufacturing precision

If RF electromagnetic field generator is used, then uniform heating is achieved, but device complexity increases

Engineering Contradiction:

Improveheating uniformityVSAvoidheating system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The RF electromagnetic field generator serves multiple functions: it generates uniform heating, controls temperature precisely, prevents combustion, and eliminates cleaning requirements. This multi-functionality justifies the increased device complexity by consolidating multiple heating-related functions into a single system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The RF electromagnetic field generator ensures uniform heating of the aerosol-forming substrate, reducing the risk of hot spots and residue buildup, while allowing for precise control and longer operational life, enabling efficient and flexible heating solutions.

Implementation Method 1

an electromagnetic field generator configured to generate a radio frequency (RF) electromagnetic field in the article cavity... Such a shisha device is configured to give rise to dielectric heating of the aerosol-forming substrate

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Data Source

PatentUS20220330613A1Shisha device with dielectric heater

Publication Date: 2022.10.20 PHILIP MORRIS PRODUCTS SA

AI summary

A shisha device for heating an aerosol-forming substrate to generate an aerosol is provided, the shisha device including: a liquid cavity containing a volume of liquid through which aerosol generated by the shisha device is drawn before inhalation by a user, the liquid cavity having a head space outlet; an article cavity to receive the aerosol-forming substrate, the article cavity being in fluid communication with the liquid cavity; and an electromagnetic field generator to generate a radio frequency (RF) electromagnetic field in the article cavity, the electromagnetic field generator including a magnetron or a solid state RF transistor. A shisha system is also provided, including the shisha device and the aerosol-generating article. An aerosol-generating article for the shisha system is also provided.