US 6,390,807 B1Granted

Pot type oil burner with unnoticeable bad odor

OwnerOsamu Niwa, Koichi Watanabeinventors

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Abstract

The present invention relates to a structure in which an unburnt gas can be prevented from being diffused into a room while suppressing the generation of the unburnt gas during the extinction operation of a pot type oil burner. During the extinction operation, first of all, the supply of a fuel from fuel feeding means (35) to a pot (15) is stopped and conduction to an electric heater (31) is started. The rotation of each of a combustion fan (23) and a convection fan (11) is carried out continuously. While a second timer (67) counts a second time period, the convection fan (11) is rotated at a high speed. After the second time period is ended, the rotation of the convection fan (11) is switched from high speed rotation into low speed rotation. The low speed rotation is carried out continuously for a third time period counted by a third timer. After the third time period is ended, the rotation of the convection fan (11) is returned from the low speed rotation to the high speed rotation. During the low speed rotation, an unburnt gas discharged from an air outlet (3) of a frame body (1) to the outside is raised to a ceiling portion with a natural convection so that the diffusion of the unburnt gas can be suppressed.

A pot type oil burner comprising:

a frame body having an air outlet in a front part thereof;
a cylindrical bottomed pot provided in the frame body and having a large number of through holes for air flow on a peripheral wall;
a combustion fan including a first motor as a driving source and serving to supply combustion air into the pot through the through holes;
combustion fan control means for controlling rotation or the first motor, thereby controlling an amount of air flow from the combustion fan;
fuel feeding means for feeding a fuel into the pot through a fuel feeding pipe;
fuel feeding control means for controlling a driving operation of the fuel feeding means;
an electric heater to be energized from a start of ignition to a start of combustion, to heat the pot;
heater control means for controlling the energization to the electric heater;
a convection fan including a second motor as a driving source, attached to the frame body to feed air from an outside of the frame body into the Frame body and to blow out the air into a room through the air outlet together with a combustion gas discharged from the pot;
fan control means for controlling rotation of the second motor, thereby controlling an amount of air flow from the fan;
and
a control command generator for giving a control command to the combustion fan control means, the fuel feeding control means, the heater control means and the convection fan control means, respectively,
the control command generator outputs a fuel feeding stop command for stopping the driving operation of the fuel feeding means to the fuel feeding control means and outputs a heater energization command to the heater control means, in order to energize the heater for a predetermined first time period which is longer than a time period required for completely ending combustion, when an extinction command is input,
outputs a rotation decrease command for decreasing the rotation of the second motor to the convection fan control means so as to decrease the amount of air from the convection fan, after a predetermined second time period equivalent to a time period to be considered to start incomplete combustion after the extinction command is input passes, while a predetermined third time period to be considered to be required for reducing a combustion flame or extinguishing the flame in the pot then passes, and
outputs a fan stop command for stopping the combustion fan and the convection fan to the combustion fan control means and the convection fan control means after the first time period is ended.

12 more elements

Abstract

Claims9