GB2121526A - Pot-type oil burner - Google Patents

Abstract

A pot-type oil burner (10) is disclosed which is capable of stabilizing the vaporization rate of a fuel oil in a pot (12) to accomplish the stable complete combustion with a good efficiency. The oil burner is constructed with a heat- resistant fabric (60) on the bottom surface of the pot (12) to vaporize a fuel oil with a constant rate. The oil burner is also capable of significantly reducing retention of tar in the pot and enabling removal of tar from the pot as desired. <IMAGE>

Description

SPECIFICATION Pot-type oil burner This invention relates to an improved pot-type oil burner, and more particularly to a pot-type oil burner which is adapted to stabilize the vaporization rate of a fuel oil in a potto form a uniform combustible gas, to thereby carry out stable and efficient combustion.

In a pot-type oil burner which does not use a wick, it has been required to keep a pot or a vaporization means ata high temperature utilizing a radiant heat emitted from a combustion chamberandlora heat emitted from an electric heater in orderto effectively carry out the vaporization of a fuel oil such as kerosene in the pot. In the oil burner of such type, there appears a phenomenon that a fuel oil supplied to the pot, when heated to a high temperature, gets about in the form of fine particles on walls ofthe pot and is vaporized at a stretch.Unfortunately, this results in a conventional oil burner of such type having a disadvantage that it is substantially impossible to stably supply a vaporized fuel oil to a combustion chamberata uniform rate, because it does not have any means effective to prevent such phenomenon. Further, it should be noted that such phenomenon appears in a pot of a relatively low temperature as well as a high temperature.

Also, the conventional pot-type oil burner has another disadvantage that the vaporization of a fuel oil supplied to the pot starts with a fraction of a lower boiling temperature to causetarto remain in the pot, resulting in the oil burner causing an incomplete combustion.

The present invention has been made in view ofthe foregoing disadvantages ofthe prior art.

Accordingly, it is an object ofthe present invention to provide a pot-type oil burner which is capable of stabilizing the vaporization rate of a fuel oil in a pot and forming a uniform combustable gas to accomplish the stable combustion with a good efficiency.

It is another object of the present invention to provide a pot-type oil burnerwhich is capable of significantly reducing retention of tar in a pot to carry out the stable complete combustion.

It is still a further object of the present invention to provide a pot-type oil burner which is capable of removing tar remaining in a pot as desired to constantly ensurethe stable complete combustion.

In accordancewith the presentinvention,there is provided a pot4ypeoil burner comprising a pot carrying out at least the vaporization of a fuel oil supplied thereto; an air supply means for supplying airto the pot; an oil supply means for supplying a fuel oil to the pot; an airpipeforintroducing a part of air flowing through the air supply means therethrough to the pot; an oil pipeforintroducing a fuel oil from the oil supply meanstherethrough to the pot; a fabric formed of a heat-resistantfiberandspread on the bottom surface ofthe pot; a heating means for heating the pot and fabric to atemperaturesufficientto vaporize a fuel oil supplied to the pot; and a nozzle means connected with the oil pipe to eject a fuel oil therefrom into the pot and positioned with respect to the air pipe so asto supplythe ejected fuel oil in the form offine particles toward the substantially entire surface of the fabric by means of air supplied from the air pipe into the pot.

The fabric may be spread over the substantially entire bottom surface ofthe pot. A preferred embodiment ofthe present invention may be constructed in a manner such that the air pipe and oil pipe merge into a single pipe extending to the pot to carry a fuel oil on air, the nozzle means is provided at the end ofthe single pipe,the heating means is arranged adjacentto the fabric in the pot, and the pot is provided atthe side wall thereof with a plurality ofthrough-holes com municated with the airsupply means, whereby the pot carries outthe mixing of a vaporized fuel oil with air supplied through the through-holes thereto and the ignition as well as the vaporization. Alternatively, the oil burner may be constructed to extend the oil pipe through the interior ofthe air pipe into the pot and mount the heating means on the outside of the bottom wall of the pot. Also, the fabric may be formed into a reticulate shape to carry an oxidation catalyst thereon.

Furthermore, the present invention may be constructed to removably arrange the fabric in the pot.

Other objects and manyoftheattendantadvan- tages of the present invention will be readily appreci atedasthesame becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which like reference numerals designate the same parts th roughoutthe figures thereof and wherein: Fig. lisa vertical sectional view showing one embodiment of a pot-type oil burner according to the present invention; and Fig. 2 is a vertical sectional view showing an essential part of another embodiment of a pot-type oil burner according to the present invention.

Now, a pot-type oil burner according to the present invention will be described hereinafterwith reference totheaccompanying drawings.

Fig. 1 illustrates one embodiment of a pot-type oil burner according to the present invention wherein the oil burner is generally designated by reference numeral 10. The pot-type oil burner illustrated in Fig. lisa red-hottype oil space heater, however, is should be noted that the oil burner is not limited to such space heater.

The oil burner 10 includes a pot 12 which is adapted to carry outtherein the vaporization, mixing and ignition of a fuel oil such as kerosene supplied thereto.

The pot 12 is separated into a lower chamber 14 and an upper chamber 16 by a horizontal partition 18 having an opening 20formed atthecentral portion thereof, through which the lower and upper chambers 14 and 16 are communicated with each other. The lower chamber 14 has an electric heater 22 provided therein which serves to heat a fuel oil to vaporize it and ignite the vaporized fuel oil to burn a part thereof using air supplied from through-holes 24 formed at the sidewall thereof. The upper chamber 16 has a mixing means 26 provided therein, which is arranged at a position above the opening 20.The mixing means 26 acts to form a combustible gas in the upper chamber 16 by uniformly diffusing in the upper chamber 16 a fuel oil vaporized in the lowerchamber 14 and allowing the diffused oil fuel to be mixed with air supplied to the chamber 16 through a plurality of through-holes 28formed at the side wall of the chamber 16.

The oil burner 10 also includes an air supply means for supplying airto the pot 12. The air supply means comprises an airfan 30 provided atthe outside ofthe burner and an air supply passage 32 defined in the burner 10 and connected to the fan 30. The air passage 32 is communicated with the interior of the pot 12 through the through-holes 24 and 28 ofthe pot and an air supply pipe 34 connected between the passage 32 and the pot 12.

Furthermore, the oil burner 10 includes an oil supply meansforsupplying a fuel oil to the pot 12, which comprises an oil tank 36 and an oil reservoir 38. The oil reservoir 38 is adapted to support the oil tank 36 in an inverted manner and also keep the level of a fuel oil therein substantially constant. The oil reservoir 38 is communicated with the pot 12 through an oil supply pipe 40 that a fuel oil may be supplied from the tank 36therethrough to the pot 12. In the embodiment illustrated, a fuel oil is supplied by means of an electromagnetic pump 42 connected between the oil supply pipe 40 and the reservoir 38.

The pot-type oil burner ofthe embodiment, as shown in Fig. 1, is also constructed in a manner such thatthe air supply pipe 34and the oil supply pipe 40 merge into a single pipe 46 extending to the pot 12 so that a fuel oil carried on air may be supplied to the pot and the oil supply pipe 40 or single pipe 46 is formed at the end portion thereof extending through the side wall ofthe pot 12therein with a nozzle pipe 48. This allows a fuel oil mixed with air and carried thereon to be ejected in the form of fine particles therefrom into the pot.

Abovethe pot 12,a combustion chamber50 is arranged which is adapted to burn therein a combusti blegasformed in the upper chamber 16 of the pot utilizing combustion airsupplied from the air passage 32 through thethrough-holes 28 thereto and heat of a fuel oil burned in the pot 12. The combustion chamber 50 has an outer perforated combustion cylinder 52 and an inner perforated combustion cylinder 54 each formed of a ceramic material.A combustible gas formed in the pot 12 and supplied to the combustion chamber 50 is burned ontheoutersurfaceoftheinner cylinder 54 and the both surfaces of the outer cylinder 52to red-heatthe cylinders 52 and 54, to thereby allow the cylinders to emit heat rays.Around the outer combustion cylinder 52 is disposed a transparent heat-permeable cylinder 56 formed of a heat-resistant glass through which heat rays emitted from the cylinders are dischargedtothe exteriorofthe burner.

A combustion gas produced iin the combustion chamber 50 is discharged through an opening provided at the top surface ofthe combustion chamberto the exterior ofthe burner. Alternatively, an auxiliary combustion chamber may be arranged above the chamber 50 in communication therewith to completely burn a combustible gas and/oran incomplete combustion gaswhich may remain in a combustion gas produced in the combustion chamber 50.

One of the essential features ofthe present invention is that a fabric 60 formed of a heat-resistantfiber such as silica fiber, an asbestos fiber or the like is put down on the bottom surfaceofthelowerchamber14 ofthe pot 12 and heated to a high temperature by a heater 22.The fabric 60 is preferably a woven fabric although it may be a non-woven fabric. The fabric 60 is preferably spread on the substantially entire bottom surface of the pot. In the embodiment shown in Fig. 1, the fabric 60 is disposed immediately below the heater 22 so as to be readily heated to a high temperature.

This effectively prevents a part of a fuel oil supplied to the pot and heated to a hightemperaturefrom getting about in the form of fine particles in the pot, particularly, on the bottom surface thereof Also, such construction has another advantage that the fabric absorbs a fuel oil to allowthefuel oil to have an enlarged surface area, so thatthe fuel oil may be instantlyvaporized. Thus, it is possible to stably supply a vaporized fuel oil to the combustion chamber ata uniform rate, becausethefuel oil can be continuously and constantly vaporized in the pot.

Further, it is possible to significantly reduce the deposition oftar in the pot because a fuel oil heated to a high temperature is prevented from getting about in the pot It is preferable that the fabric 60 is merely put down on the bottom surface of the pot in order that when tar is substatially deposited on the fabric, it may be readily removed from the potforthe purpose of exchange. Also, the fabric is preferablyformed in a reticulate shape to allow an oxidation catalyst such as platinum or the like to be carried thereon. This results in materials hard to be vaporized being readily vaporizedd.

Anotherfeature of the present invention is that a fuel oil is supplied in the form offine particles to the pot. Afuel oil is preferably rained on the substantially entire surface ofthe fabric. The embodiment shown in Fig. 1 is constructed in a manner such that the nozzle pipe 48 is disposed adjacent to thefabric 60 and to gently slope downwardlytoward the fabric, to thereby allow a drizzle-like fuel oil ejected from the nozzle to be rained on the entire fabric.

Now, the manner of operation ofthe pot-type oil burner illustrated in Fig. 1 will be explained hereinafter.

Electric current is supplied to the heater 20, the air fan 30 and the electromagnetic pump 42 to heat the pot 12 and the fabric 60 to a predetermined temperature, supply airto the air supply passage 32, and initiate the supplyofa fuel oil to the oil supply pipe 40, respectively.Afuel oil is supplied from the reservoir 38 through the oil supply pipe 40to the nozzle pipe 48 ofthe single pipe 46 and concurrently air is supplied from the air supply passage 32 through the air supply pipe 34to the nozzle pipe 48, so thatthe fuel oil is carried on the air in the nozzle pipe 48 and ejected in the form of fine particles from the nozzle pipe into the lower chamber 14 of the pat12ata relatively high velocity. The fuel oil ejected into the lower chamber 14 is dispersed toward the entire surface ofthe fabric 60 heated to a high temperature to be stably vaporized at a uniform rate. In the embodiment of Fig 1, the heater 22 also servesto ignite the vaporized fuel oil to allow a partthereof to be burned in the pot 12 using air mainly supplied through the through-holes 24to the lower chamber 14. The vaporized fuel oil is then introduced through the central opening 20 ofthe horizontal partition wall 18 into the upper chamber 16 and mixed with airsupplied from the passage 32through the through-holes 28 ofthe chamber 1 6thereto to form a combustible gas.The so-formed combustible gas is supplied to the combustion chamber 50 together with thefuel oil ignited in the lower chamber 14to be subjected to combustion in the chamber 50 using combustion air supplied from the passage 32 through the holes 28 ofthe upper chamber 1 6tothe chamber 50.The combustion allowsthe cylinders 52 and 54to be red-heated to emit heat rays which are discharged through the heat-permeable cylinder 51 to the exterior. A hotcombustion gas produced by the combus tionchamber50isdischargedthrough an upper opening of the combustion chamberto the exterior.

Fig. 2 shows another embodiment of a pot-type oil burner according to the present invention. The oil burner of the present embodiment isthetype of carrying out heating mainly due to convection. More particularly, the oil burner 10 includes a pot 12 which has a fabric 60 formed of a heat-resistantfiberand spread on the entire bottom surfacetherof. The pot 12 has an electric heater 22 mounted on the outside ofthe bottom wall thereof to heatthe pot 12 and the fabric 60 to a high temperature sufficientto vaporize a fuel oil supplied thereto. The pot also has an air supply pipe 34for supplying airfrom an air supply means (not shown) therethrough to the pot and a nozzle pipe 48 extending through the interior ofthe airsupply pipe34 into the pot 12.The nozzle pipe 48 acts to supply a fuel oil from an oil supply means (not shown) therethrough to the pot 12. Thus, a fuel oil ejected from the nozzle pipe 48 isformed into fine particles by air supplied from the pipe 34to the pot 12, carried on the air and rained on the entire surface of fabric 60 heated to a high temperature; sothatthefuel oil may be vaporized. The vaporized fuel oil is then supplied to a mixing tube 62 vertically arranged atthe upper portionofthepotl2togetherwith airintroducedfrom thiepipe 34 to the pot, wherein the fuel oil is substantially mixed with the air form a combustable gas.The so-formed combustable gas is guided through a perforated plate 64to a combustion means or combustion plate 66 having a plurality of throughholes 68formed atthesidewallthereofand is ignited bya suitable igniting means.Theignited combustible gas is burned atthe combustion plate 66to form a blue flame viathethrough-holes 68, to thereby produce a combustion heatofa high temperature. The heat is carried on a combustion gas and discharged through an exhaust port (not shown) ofthe oil burner. Thus, it will be readily understood that the present embodiment hasthe same advantabes asthat of Fig. 1.

As can be seen from the foregoing, the present invention is capable of continuously and constantly vaporizing a fuel oil to stably supply itto the combustion chamber at a uniform rate. Furthermore, the present invention is capable of significantly reducing retention oftar in the pot and removing, as desired, tar remaining in the pot, to thereby constantly ensure complete combustion.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it isto be understood that the invention is not limited to the specific embodiment thereof except as defined in the appended claims.

Claims (10)

1. A pot-type oil burner comprising: a pot carrying out at leastthe vaporization of a fuel oil supplied thereto; an air supply means for supplying airto said pot; an oil supply meansforsupplying a fuel oil to said pot; an air pipefor introducing at least a part of air flowing through said air supply means therethrough to said pot; an oil pipefor introducing a fuel oil from said oil supply meanstherethrough to said pot; a fabric formed of a heat-resistantfiber and spread on the bottom surface of said pot; a heating means for heating said potandsaidfabric to a temperature sufficientto vaporize a fuel oil supplied to said pot; and a nozzle means connected with said oil pipeto eject afuel oil therefrom into said pot and positioned with respect two said air pipe so asto supply said ejected fuel oil in the form offine particles toward the substantially entire surface of said fabric by means of air supplied from said air pipe into said pot.

2. Apot-type oil burner as defined in Claim 1, wherein said fabric is spread over the substantially entire bottom surface of said pot.

3. A pot-type oil burner as defined in Claim 2, wherein said air pipe and said oil pipe merge into a single pipe extending to said pot said nozzle means is provided atthe end of said single pipe, said heating means is arranged adjacent to said fabric in said pot, and said pot is provided atthe side wall thereof with through-holes communicated with said air supply means, whereby said pot carries outthe mixing of a vaporized fuel oil with air supplied through said through-holesthereto and the ignition as well as said vaporization.

4. A pot-type oil burner as defined in Claim 2, wherein said oil pipe is arranged to extend through the interior of said air pipe into said pot and said heating means is mounted on the outside ofthe bottom wall of said pot.

5. A pot-type oil burner as defined in Claim 1,2,3 or4, wherein said fabric is formed into a reticulate shape and has an oxidation catalyst carried thereon.

6. A pot-type oil burner as defined in Claim 1,2,3,4 or 5, wherein said fabric is removably arranged in said pot.

7. A pot-type oil burner comprising: a pot having a pluraityofthrough-holesformed at the side wall thereof to carry out the vaporization, mixing and ignition of a fuel oil supplied thereto; an air supply meansforsupplying airto said pot and an oil supply meansfor supplying a fuel ≈I I to said pot; an air pipe for introducing a partoofairflowing through said airsupply meanstherethroughtosaid pot and an oil pipeforintroducing afuel oil from said oil supply means therethrough to said pot, said air pipe and oil pipe merging into a single pipe; a fabricformed of a heat-resistantfiber and spread on the substantially entire bottom surface of said pot;; a heating means arranged adjacentto said fabric in said pot to heat said pot and fabric to a temperature sufficientto vaporize a fuel oil supplied to said pot and ignite the vaporized fuel oil; and a nozzle means provided atthe end portion of said single pipe and positioned above said fabric to eject a fuel oil carried on air therefrom.

8. Apot-typeoil burner comprising: a pot carrying out the vaporization and mixing of a fuel oil supplied thereto; an air supply means forsupplying airto said pot and an oil supply means for supplying a fuel oil to said pot; an air pipe for introducing airfrom said air supply means to said pot and an oil pipe for introducing a fuel oil from said oil supply means to said pot, said oil pipe being arranged to extend through the interior of said air pipe into said pot; a fabric formed of a heat-resistantfiber and spread on the substantially entire bottom surface of said pot; a heating means arranged on the outside of the bottom wall of said potto heat said pot and fabric to a temperature sufficient to vaporize a fuel oil; and a nozzle means provided atthe end portion of said oil pipe extending to said pot to extend into said pot to eject a fuel oil therefrom.

9. A pot-type oil burner substantially as described herein with reference to Figure 2 ofthe accompanying drawings.

10. The features as herein described, ortheir equivalents, in any novel selection.