Heating – Heat generator heats gas or liquid material in a flow structure – Material heated by mixing with combustion products of generator
Patent
1983-04-12
1985-11-26
Yuen, Henry C.
Heating
Heat generator heats gas or liquid material in a flow structure
Material heated by mixing with combustion products of generator
432219, 431255, 431344, 34 99, 34 97, A45D 2006, F24H 100
Patent
active
045552320
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a hair drying apparatus and is primarily concerned with a portable apparatus which may function independently of a mains power supply.
Conventional hand held hair dryers, even small size units, require an electrical power input of some 250 watts or more principally to provide sufficient heating of the air flow. Power is also consumed by the air impeller means which may be a tangential, centrifugal or axial electric fan. It is impractical to obtain this order of electrical power from storage batteries.
Hand held dryers achieve the drying effect through air flow to speed-up natural evaporation and heat to further assist the evaporation process. Practicalities dictate a fiarly narrow range of combination of air flow and heat to obviate damage and prevent discomfort both physical and aural. Relative humidity in the environment of use of the dryer also considerably effects the drying.
In one aspect this invention seeks to provide a hair-dryer which is portable, operating independently of a fixed power source. In a second aspect the invention provides an improved hair dryer apparatus, preferably portable, to achieve a better and quicker drying process independently of atmospheric conditions.
According to this invention there is provided hair drying apparatus having a body unit, air impelling means to draw air through the body from an inlet and to expel same through an outlet nozzle, and a heating means disposed within the air flow to heat the air during passage from the inlet to the outlet, the body being tubular with the air inlet at one end and the air impelling means located within the body at said end, characterized by the heating means being supplied with heat from a gas burner located within the body and connected by a gas feed duct to a gas reservoir within a hand grip secured to the body, the air outlet nozzle being provided at the other end of the body.
The burner may be a flame burning kind or a catalytic combustion device which is flameless. Preferably the burner is screened from the air flow and incorporates a flame detector means operative to shut off the gas supply in the event of flame failure. The burner unit may be positioned within the air flow to transfer heat to the air passing thereover or by using a heat pump as the burner means the burner itself may be remotely located out of the air flow, for example in a part of the apparatus integral with the body unit.
The gas may be contained within a body part, such as the handle, and may be contained in a removable and replaceable cartridge or a container refillable from an external gas bottle.
The gas used preferably will comprise mainly butane stored in liquid form. In one embodiment the gas is acetylene produced preferably by the action of water on calcium carbide, suitably contained integrally or at a remote location.
The air impelling means may be driven by a turbine supplied with pressure gas or within the gas flow path to the burner, said path being preferably heated by the burner to increase the energy in the gas to operate the turbine.
In order to provide a more time-efficient drying process the invention also proposes a hair drying apparatus including a cooling means to condense moisture from the air drawn in prior to heating. Such an arrangement ensures that the air has a reasonable water absorbing capacity even under conditions of high humidity. Quicker drying can thus be produced at lower air temperatures.
The cooling mens may be integrated with the gas burner and may include a refrigerant circuit heated by the gas burner with heat being given up to the air flow prior to expansion producing the cooling of the intake air. The arrangement may comprise a combined regrigerating means and heat pump. The gas supply may be used as the refrigerant being initially heated by the burner to drive the turbine and to give up heat prior to the heating of the air flow by the burner and the thereafter expand to absorb heat by cooling the intake air flow, the gas being then fed to the burner.
By simultaneous use of the gas to he
REFERENCES:
patent: 1963345 (1934-06-01), Zwilling
patent: 2396821 (1946-03-01), Breese
patent: 2410478 (1946-11-01), Breese
patent: 2666480 (1954-01-01), Peterson
patent: 3179156 (1965-04-01), Weiss et al.
patent: 3301308 (1967-01-01), Briggs
patent: 3873262 (1975-03-01), Pogrell
King James B.
Raccah Edward R.
Groff, Jr. Emory L.
Yuen Henry C.
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