JPS62210309A - Kerosene burning apparatus - Google Patents

Abstract

PURPOSE:To obtain a complete combustion due to a constantly stable flame by supplying air only in a quantity required for combustion to a secondary burning part wherein an incompletely burnt gas sent from a primary burning part is subjected to a diffusion combustion, and discharging surplus air as it is. CONSTITUTION:Secondary air is supplied through an air passage 49 formed outside partition plate 48, whereby a resident time of a reaction of the secondary air with oxygen at a premixed combustion gas portion is prolonged and a diffusion combustion can be carried out by sufficiently supplying oxygen thereto. Further, the passage 49 output the partition plate 48 can secure an area sufficient for the structure, and hence, even if the quantity of the incomplete combustion gas is increased by making the combustion state 'strong', a sufficient quantity of secondary air can be supplied, this can sufficiently follow the flame rising, and adherence of soots or the like can also be prevented. Further, secondary air is supplied from the outside to a secondary burning portion 30, and a part necessary for the quantity of the premixed combustion gas is completely mixed, and unnecessary (surplus) air does not make contact with the flame but is discharged through an upper opening 44.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention relates to an oil combustion appliance having a primary combustion section using a combustion tube and a secondary combustion section for diffusively burning incompletely combusted gas from the primary combustion section. Regarding.

(Prior art) As an oil burning appliance, for example, Japanese Utility Model Publication No. 51-46678 and Japanese Utility Model Publication No. 57. As shown in Publication No. 10607, there is a primary combustion section that has a combustion tube consisting of an inner flame tube, an outer flame tube, and an outer tube, and a secondary combustion section that is located above the combustion tube and performs diffusion combustion of incompletely combusted gas. A two-stage combustion system is known in which a secondary combustion section is provided to perform different combustions in the upper and lower sections.

In this combustion method, premixed combustion of blue flame is carried out in the combustion tube that constitutes the secondary combustion section, and the incompletely combusted gas generated here is guided to the secondary combustion section located above, where white flame is produced. The reburning process is completed by performing diffusive combustion.

Here, the combustion process of kerosene in oil-burning appliances is the second
As shown in the figure, liquid kerosene becomes gaseous kerosene molecules,
Oxygen 02 is added and thermal decomposition is carried out to form an oxidized intermediate product, and furthermore, if oxygen diffusion is sufficient, a blue flame is preliminarily combusted. On the other hand, if oxygen diffusion is insufficient, the carbon will depolymerize and become colloidal carbon, but by supplying oxygen to this carbon, spontaneous diffusion combustion will occur.

In other words, in the combustion tube, most of the vaporized gas is premixed and combusted with a blue flame due to the air supplied from the many small holes provided in the peripheral walls of the inner and outer flame tubes, but some of it is incomplete combustion gas. (colloidal carbon). Therefore, this incompletely combusted gas is guided to the secondary combustion section, and fresh air is added thereto to cause spontaneous diffusion combustion.

By combining different combustion states in this way, it is possible to maximize the advantages of both while compensating for each other's shortcomings.Theoretically, it is possible to reduce the concentration of carbon monoxide and nitrogen oxide contained in the combustion exhaust gas1. Therefore, it is more suitable for indoor open-type combustion heating appliances than semi-combustion type ones.

By the way, in the structure of an existing product that realizes the above-mentioned two-stage combustion method, the lower primary combustion section and the upper secondary combustion section are completely separated by interposing a partition plate. In addition, the air supply path for the secondary combustion section is from the outside of the combustion tube, passing between the partition plate and the top of the combustion tube, and directly above the flame path of the primary combustion section (between the inner and outer flame tubes). A path for supplying fresh air to the inner flame cylinder, and a path for supplying fresh air from inside the inner flame cylinder to the outside through a diffuser plate located above the inner flame cylinder were provided. That is, the diffuser plates located outside and above the combustion tube direct fresh air upward and downward from inside the combustion tube toward the incompletely combusted gas (colloidal carbon state) rising from the flame duct of the secondary combustion section. The gas is concentrated in a stub-like shape, and a flattened gas is formed outward in the secondary combustion zone.

According to the above configuration, there is no problem in combustion performance under normal combustion conditions within an appropriate range. However, when adjusting the firepower, it is less than 1.
If there is a sudden change from 1' to over 1', or if a wick with a raised wick is used to increase the amount of combustion, improvements in combustion performance may be required. It was revealed from the experiment.

(Problem to be Solved by the Invention) In other words, the amount of air that is concentratedly supplied directly above the passage of the secondary combustion section is normally set to the maximum heating power side that is suitable for strong combustion, within the range where the flame is not cooled to the 8i end. Set. However, “strong”
If you are trying to obtain a range of firepower adjustment within the proper combustion range from 1 to 1", you cannot unnecessarily increase the air gap.

For example, if the air m is set to "strong", there will be excess air in the "1 weak" state. Excess air reduces flame temperature,
- Leads to an increase in carbon oxide concentration. Further, there is a problem that the combustion is accelerated and the flame does not spread.

In other words, the incompletely combusted gas that flowed out directly above the passage of the secondary combustion section has become high temperature due to the primary combustion and is in a state where it is easy to react, so if a large amount of air is supplied there, combustion will be completed immediately. Put it away. This causes a serious problem in that the flame of diffusive combustion does not spread and the draft force due to combustion becomes weak. As described above, the air gap in this part is subject to various restrictions, and even if the air gap is adjusted, an increase in the amount of combustion cannot be expected.

Further, when the above-mentioned "strong" and "weak" variables are changed, especially when there is a sudden change from "weak" to "strong" or "1", an instantaneous flare occurs, but this cannot be adequately dealt with.

In other words, the amount of air directly above the passage of the secondary combustion section is set to be a little less than 1° as described above, considering the influence on combustion. For this reason, the followability to the flame is poor, and the flame extends with incomplete combustion, causing soot to adhere to the inner wall of the secondary combustion section.

In the above-mentioned Japanese Utility Model Application Publication No. 57-10607, as a countermeasure to the above, an auxiliary air hole is provided in the partition plate to obtain a certain effect, but as long as the main supply path for secondary air is placed directly above the through hole, An increase in combustion 4 cannot be expected.

Furthermore, the following problems arise in terms of structure.

In other words, if the combustion tube located at the bottom is formed independently and dropped into the secondary combustion section from above, the combustion tube is likely to be seated incorrectly or air leak due to the relationship with the partition plate. ,
Dimension control for the secondary air passage becomes troublesome. Also,
When igniting, there are restrictions such as having to raise the combustion tube while keeping it horizontal or igniting the combustion tube while keeping it stationary.

Furthermore, if the upper and lower parts are integrated, the center of gravity will be high, the weight will be heavy, and the ignition-related mechanism will be complicated, which will increase costs.

An object of the present invention is to provide an oil combustion appliance that can always provide a stable combustion state without being affected by thermal power adjustment, is easy to assemble, and is not restricted by ignition means.

[Structure of the invention]

(Means for Solving the Problems) The oil-burning appliance according to the present invention has an annular shape on the burner cap attached to the upper part between the outer flame tube and the outer tube of the combustion tube constituting the secondary combustion section. The inner circumferential edge of the dividing plate is attached to the outer circumferential edge of this dividing plate so as to prevent the introduction of outside air directly above the primary combustion section. A ventilation passage is formed.

(Function) In the present invention, necessary and sufficient suspension air is supplied to the diffusion combustion in the secondary combustion section through the ventilation path formed outside the outer peripheral edge of the partition plate, and the surplus air is left as is. It is designed so that a stable combustion state can always be obtained by exhausting the fuel.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 11 is a fixed tank, which is installed on four units 12. A cylindrical wick guide 13 is integrally installed inside the fixed tank 11, and a cylindrical lamp wick 14 is attached to the outer peripheral surface of the wick guide 13, and together with a burner basket 15 surrounding the outer surface of the wick guide 13, a cylindrical lamp wick 14 is installed. 14 is supported so that it can move up and down. In addition, at the upper end opening of this core guide 13,
A lead guide cap 16 having a ventilation hole is attached to the cap.

Reference numeral 18 denotes a primary combustion section, which has a combustion tube 19 placed on a fire pan made up of the outer edge of the wick guide cap 1G and the bent upper end of the burner basket 15. This combustion f519
The inner flame tubes 20 are arranged concentrically with a distance between them.
．． Outer flame tube 21. The lower end of the inner flame tube 20 is placed on the outer edge F of the wick guide cap 16, and the lower end of the outer flame tube 21 is placed on the upper bent portion of the burner basket 15. be done. Further, a large number of small holes are formed on the circumferential surfaces of the inner flame tube 20I3 and the outer flame tube 21, respectively, and combustion air is provided between the inner flame tube 20 and the outer flame tube 21, which are the spaces above the lamp wick 14. supply. Here, since the upper part of the outer flame cylinder 21 becomes a red-hot part during combustion, the outer cylinder 21
The part facing the red-hot part is a heat ray transmitting part 22A made of heat-resistant glass or the like, and the lower part thereof is a support part 22 made of an iron plate or the like.
It is B. A guide disk 24 having ventilation holes and a reinforcing ring 25 are provided at the lower part of the inner flame tube 20 . These internal inflammations 9420. The lower portions of the outer flame tube 21 and the outer tube 22 are interconnected with the lower portion of the sprayer tube 2B, which will be described later, by a cross bin.

The spray tube 28 has its lower end connected to the inner flame tube 20.
The upper end portion, which protrudes into the interior to communicate with the interior and has the waste plate 29, is located within the secondary combustion section 30 formed above the secondary combustion section 18. The space between the outer periphery of the spray dupe 28 and the upper end of the inner flame tube 20 is covered by an inner flame tube ring 32 having ventilation holes. Further, the upper ends of the outer flame cylinder 21 and the outer cylinder 22 are held by a burner cap 33 formed in a step shape to match the height of these upper ends.

A plurality of columns 35 are installed on the body base cover 36, and a tubular spanner 37 having a length corresponding to the height of the secondary combustion section 18 is attached to the outer periphery of the lower half of the column. There is. 39 is an annular base plate, and the above spacer 3
7, that is, at the boundary between the secondary combustion section 18 and the secondary combustion section 30 along the horizontal direction. A glass flame tube 42 surrounding the secondary combustion section 30 is provided on the base plate 39, and the upper part of the glass flame tube 42 is connected to a glass flame tube support member 43 fixed to the upper end of the support column 35.
It is supported and fixed by. Note that an opening 4 through which combustion exhaust gas flows out is provided on the upper circumferential side of the glass flame tube support member 43.
4 is drilled, and the upper plate 45 is 1# on the top! A guard 46 is provided between this and the body base cover 36.

Reference numeral 48 denotes an annular dividing plate, the inner circumferential edge 48b of which is attached to the burner cap 33, and the outer circumferential edge 48a of which is dimensioned so as to be located outward from the outer circumference of the combustion tube 19. Then, a combustion tube 19 is provided on the outside of this outer peripheral edge 48a.
A ventilation passage 49 leading into the secondary combustion section 30 is formed from the periphery of the combustion chamber.

In the above configuration, when performing a combustion operation, the lamp wick 14 is first raised to the position shown in FIG.

Although not shown, for example, the body base cover 3
An ignition device is built in the right side in the figure surrounded by 6, and by operating the ignition lever, the right side of the combustion tube 19 in the figure is lifted up, the tip of the ignition heater is pressed against the upper end of the lamp wick 14, and the lamp wick 14 is removed. ignite the kerosene that is sucked up by capillary action at the top of the cylinder.

After the above-mentioned ignition, in the secondary combustion section 18, the vaporized gas is combusted between the inner flame tube 20 and the outer flame tube 21 above the wick 14 together with air from a large number of small holes provided in the peripheral walls of these. Premixed combustion of blue flame takes place. In addition, the incompletely combusted gas rises from the flame path into the secondary combustion section 30 and is diffused and combusted together with the air guided outward by the diffusion plate 29 provided at the upper end of the sprayer tube 28. Fresh air supplied into the secondary combustion section 20 through the ventilation passage 49 formed outside the partition plate 48 is also used as secondary air for this diffusive combustion.

Here, conventionally, air guided outward by the diffusion plate 29 for diffusive combustion and air introduced directly above the combustion tube 19 from outside the combustion tube 19 were supplied, but in this structure, premixed combustion The reaction between gas and air was accelerated, and diffusion combustion ended in a short period of time, so there was a limit to how far the flame could spread and the number of consumers could increase.

On the other hand, in the present invention, since the secondary air is supplied through the ventilation passage 49 formed outside the partition plate 48, the reaction residence time with oxygen in the premixed combustion gas portion is extended.
Diffusion combustion can be performed by supplying sufficient oxygen. In addition, the ventilation passage 49 on the outside of the partition plate 48 has its structure.
- Since a sufficient area can be secured, even if incomplete combustion gas increases by setting the combustion state to "strong", sufficient secondary air can be supplied to the melon, and it can follow the rising flames sufficiently to prevent soot. Adhesion, etc. can be prevented. Also, this secondary air is supplied to the secondary combustion section 3.
Since the premixed combustion gas is supplied from the outside, only the necessary amount of premixed combustion gas is completely mixed, and unnecessary (excess) air is exhausted from the upper opening 44 without coming into contact with the flame. For this reason, even if the flame is shortened by making the combustion state "weak" and multiple secondary air units are not required, the excess air will not come into contact with the flame, so the flame will not be cooled down. moreover,
In this case, the excess air is exhausted as it is, which lowers the temperature inside the combustion chamber, thereby reducing the generation of HO2.

As a result, the flame is always kept in a stable state, and the exhaust gas is clean due to complete combustion.

In addition, in the above configuration, the outer diameter of the partition plate 48 eliminates Qff.
It has been confirmed that there is a change in i. This is because the time the secondary air is in contact with the outer flame changes.

Note that the base plate 39 is used as a flange for supporting the upper glass flame tube 42, and the end surface of this flange is made to be lower than the end surface of the partition plate 48. In this way, the partition plate 48 and the base plate 39 are connected to the ventilation passage 4.
9, so that the combustion tube 19 assembly can be taken in and out from above during assembly.

Further, the combustion tube 19 can be easily tilted during ignition operation, and there is no need to adopt a complicated structure or to raise the combustion tube horizontally in order to tilt the combustion tube 19 as in the past. In other words, there are no restrictions on the ignition means, and costs can be reduced.

(Effects of the Invention) As described above, according to the present invention, only the amount of air necessary for combustion is supplied to the secondary combustion section that diffuses and burns the incompletely combusted gas from the secondary combustion section, and no excess air is supplied. Since the air is exhausted as it is, it is possible to always achieve complete combustion with a stable flame.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the oil burning appliance according to the present invention, and FIG. 2 is an explanatory diagram of the kerosene combustion process. 18... Secondary combustion part, 19... Combustion tube, 20... Inner flame tube, 21... Outer flame tube, 22... Outer tube, 30... Secondary combustion part, 33... Burner cap, 48...・Dividing board, 48a
...Outer periphery, 48b...Inner periphery, 49...Air passage. Introduction 2g

Claims (1)

[Claims] (1) A primary combustion section that has a combustion tube consisting of an inner flame tube, an outer flame tube, and an outer tube, and a secondary combustion section that is located above the primary combustion section and diffuses and burns the incompletely combusted gas rising from the primary combustion section. The burner cap has an annular shape, and its inner circumferential edge is attached to a burner cap mounted on the upper part between the outer flame tube and the outer tube of the combustion tube, and its outer circumferential edge is located outward from the outer circumference of the combustion tube. An oil combustion appliance comprising: a partition plate, and an air passage leading from the periphery of the combustion cylinder to the inside of the secondary combustion section is provided outside the outer peripheral edge of the partition plate.