De-energizing electrical safety circuit
Inactive Publication Date: 2015-02-05
MABE SA DE CV
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The present invention provides a safety circuit that can quickly and safely de-energize a dryer machine using two electrical switches and a normally-open thermostat. This circuit prevents the user from being exposed to electrical shocks in case of fire, especially if they try to extinguish the fire with water. The normally-open thermostat will be located on the power input of the dryer machine and will be connected in parallel with the switches. This allows the thermostat to reach its tripping temperature and close the electric circuit, which causes the switches to be opened, almost immediately de-energizing the dryer machine.
Problems solved by technology
It is well known that risky situations exist, especially when the user fails to follow the usage recommendations described in the appliance manuals.
Said risky situations can lead to malfunctions of the home appliances or even fire.
Is estimated that these fires annually cause economic loses by an amount that rises approximately $99 million, in addition to 400 injuries and 15 deaths.
Fire can start mainly when the user inadvertently place in the dryer machine garments or other articles which are contaminated with solvents, this can lead to fire risk if the dryer machine is left unattended by the user, in addition to the fact that, today most garments are made of synthetic materials which are flammable more than garments made of cotton.
Tests have demonstrated that this arcing is also a factor that can cause fire to fabric when dust or lint is trapped in the dryer or other items placed on or besides the dryer by the user.
The mere use of switches or fuses on the electric facility circuitry of power lines, may not be enough to completely de-energize the dryer's electrical system in order to avoid arcing between powered or energized cables.
Further, with the use of power disconnection devices other than fuses, such as the use of thermo magnetic or thermoelectric breakers, mainly when these are aged devices, disconnection can be too slow or, they are not sensible enough to disconnect the dryer's power when an initial arcing between cables occurs.
Also, power disconnection devices might not protect against arcing because fire occurs randomly and the power disconnect device does not react to potential fire causes, resulting fire produced whether inside or outside the dryer cabinet.
Similar to the patent document KR 20060103581 (2006) by Kim Choul Geun, the system described in patent document U.S. Pat. No. 6,715,216 B1 (2004) by Naom Salameh, et al, does not consider power turn off, thus causing that, even though the suppressor substance, proposed in said patent document, is released, said suppressor substance may not be enough for fire extinction because electric power still present in the clothes dryer.
The system described in that patent does not consider power shut off, which can cause the extinguisher apparatus of Kim Choul Geun's patent document KR 20060103581 (2006) not being enough to suppress fire within the clothes dryer.
Method used
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Theoretical Approach
[0032]The present invention provides a de-energizing electrical safety circuit in home electric appliances that a potential fire risk, generally caused by user's misuse of said appliances could be present, which in its preferred embodiment will be applied to a dryer machine 10 shown in FIG. 1.
[0033]Referring to FIGS. 1 and 2, an exemplary dryer machine 10 that can be beneficiated by the present invention, is shown. The dryer machine 10 includes a cabinet 11 having a front wall 12, a rear wall 13, a pair of side walls 14, and 15, spaced apart one from another by front wall 12 and rear wall 13, a floor or base 16 and a top cover 18.
[0034]Located inside the cabinet 11 is a drum 20 installed to rotate around a substantially horizontal shaft. A motor 32 turns the drum 20 around the horizontal shaft, for example by means of a pulley 30 and belt 31. The drum 20 is generally cylindrical in shape, having an outer cylindrical wall 22 and an open end 21 typically comprising...
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The present invention describes a de-energizing electrical safety circuit for appliances, in particular dryer machines wherein said circuit controls power supplied from a power source, via a power cord comprising a neutral line and at least one live input line connected to a neutral line and at least one charge powered line, respectively. The de-energizing electrical safety circuit comprises at least one normally open thermostat connected to two switches corresponding to a neutral line and a charge powered line; at least one thermostat is mounted within the cabinet external to the drum. The excess heat in the cabinet closes at least one thermostat thus closing the circuit and allowing the power to flow between the neutral line and the charge powered line causing a short circuit in at least one thermostat and then opening the switches and thereby achieving a complete de-energizing of the dryer machine.
Description
FIELD OF THE INVENTION[0001]The present invention relates to an electrical safety circuit for a completely, quickly and safely de-energizing home appliances, mainly de-energizing a dryer machine when a user inadvertently charges the dryer machine with garments or other articles which are contaminated with solvents, which could lead to a fire risk if said apparatus is left unattended by the user, and further due to the fact that today most garments are made of synthetic materials which are more flammable than garments made of cotton.[0002]As a consequence, the Underwriters Laboratories Inc. (UL), a product safety certificating organization, released a new version of its safety standard for electric clothes dryers listing—Standard UL2158 for Electric Clothes Dryers—wich is in force since march 2013, which have stringent requirements for fire containment in appliances. Accordingly, the present invention provides a de-energizing electrical safety circuit comprising, in a preferred embod...
Claims
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Login to View More IPC IPC(8): D06F58/28D06F58/02D06F34/10D06F58/50
CPCD06F58/02D06F58/28D06F58/50D06F2103/00D06F34/10D06F37/42
InventorHERNANDEZ JIMENEZ, JUAN DANIELVERA TESILLOS, MIRIAN GRACIELALUCIA MENDOZA, LUIS ALFREDOARTEAGA HINOJOSA, JOSE ALBERTOMORENO ESCOBAR, JOSE AUGUSTORICARDEZ MACIAS, CARLOS ALBERTO
OwnerMABE SA DE CV