JPH0318083B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention has a primary combustion section using a combustion tube and a secondary combustion section that diffusely burns incompletely combusted gas from the primary combustion section. Concerning oil-burning appliances.

(Prior art) As an oil burning appliance, for example,
Publication No. 57-10607 and Japanese Unexamined Patent Publication No. 1983
- As shown in Publication No. 108311, etc., the inner flame tube,
It is equipped with a primary combustion section that has a combustion tube consisting of an outer flame tube, and a secondary combustion section that is located above the combustion tube and diffuses and burns the incompletely combusted gas from the primary combustion section, and performs different combustion in the upper and lower parts. A two-stage combustion system is known.

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

Here, in the combustion process of kerosene in oil-burning appliances, as shown in Figure 2, liquid kerosene becomes gaseous kerosene molecules, and oxygen O ₂ is added and thermal decomposition occurs, resulting in oxidized intermediate products. Furthermore, if oxygen diffusion is sufficient, blue flame premix combustion is performed. On the other hand, if oxygen diffusion is insufficient, it will depolymerize and become colloidal carbon.
By supplying oxygen to this, diffusion combustion of white flame is performed.

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 incomplete combustion gas is guided to the secondary combustion section, and fresh air is added to it to cause white flame 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, and theoretically it is possible to reduce the concentration of carbon monoxide and nitrogen oxide contained in the combustion exhaust gas. Therefore, compared to single-combustion type devices, it is more suitable for indoor open combustion heating equipment.

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 to 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 flame tube and the outer flame tube). a route for supplying fresh air to the
A path was provided for supplying fresh air from inside the inner flame cylinder to the outside through a diffuser plate located above it. That is, the diffuser plates located outside and above the combustion tube direct fresh air upward and downward toward the incomplete combustion gas (colloidal carbon state) rising from the flame duct of the primary combustion section from inside the combustion tube. It is fed in a concentrated manner in the form of a sandwich, forming an outwardly flattened white flame within the secondary combustion section.

According to the above configuration, there is no problem in combustion performance under normal combustion conditions within an appropriate range. However, if there is a sudden change from "weak" to "strong" when adjusting the firepower, or if a wick with a higher suction rate is used to increase combustion consumption, the combustion performance may be affected. It has been found from various experiments that the above improvements are necessary.

(Problem to be solved by the invention) In other words, the amount of air that is concentratedly supplied directly above the flame path of the primary combustion section is normally set to the maximum heating power that is suitable for strong combustion, within a range where the flame is not extremely cooled. Ru. However, in order to obtain a range of firepower adjustment within the appropriate combustion range from "strong" to "weak", it is not possible to increase the amount of air unnecessarily. For example, if the air amount is set to "strong", there will be too much air in the "weak" state. Excess air reduces flame temperature and leads to increased carbon monoxide 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 has flowed out directly above the flame path of the primary combustion section has become hot due to the primary combustion.
Since it is in a reactive state, if a large amount of air is supplied to it, combustion will be completed immediately. For this reason, a problem arises in that the flame of diffusive combustion does not spread and the draft force due to combustion becomes weak, which becomes a constraint on increasing combustion consumption. As described above, the amount of air in this portion is subject to various restrictions, and even if the amount of air is adjusted, an increase in combustion consumption cannot be expected.

Further, when changing between "strong" and "weak" as described above, especially if there is a sudden change from "weak" to "strong", a standing flame will occur instantaneously, but this cannot be adequately dealt with. That is, the amount of air directly above the flame path of the primary combustion section is set to be insufficient for "strong" combustion, considering the influence on "weak" combustion as described above. For this reason, even if a large amount of incompletely combusted gas flows out into an area where the absolute amount of air is insufficient, the combustion will not be able to catch up, and the followability of the flame will be poor, and the flame will continue to be incompletely combusted, resulting in a secondary combustion zone. This will cause soot to adhere to the inner walls, etc.

In the above-mentioned Japanese Utility Model Application Publication No. 57-10607, as a countermeasure to the above, auxiliary air holes are provided in the partition plate to obtain a certain effect, but as long as the main supply route for secondary air is directly above the flame duct, If the flame does not grow, an increase in combustion consumption 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 installed by dropping it from above into the secondary combustion section, the combustion tube is likely to be seated poorly or air leak due to the relationship with the partition plate, and the secondary Dimensional control for air passages becomes difficult. Further, when igniting, there are restrictions such as having to raise the combustion tube while keeping it in a horizontal state or igniting the combustion tube while keeping it stationary.
Furthermore, the center of gravity becomes higher and heavier when the upper and lower parts are integrated, and the ignition-related mechanism becomes complicated.
This will cause an increase in costs.

Furthermore, in the oil combustion appliance having the structure described in JP-A No. 58-108311, the ventilation passage to the primary combustion section and the ventilation passage to the secondary combustion ventilation passage are shared, and the ” “Weak” When variable, especially “Weak”
If there is a sudden change from ``strong'' to ``strong'', the air supply to the secondary combustion section is regulated by the air holes in the top plate, so the air supply is regulated by the air holes installed in the top plate, so it is necessary to As a result, the followability of the flame is poor, and as with the case where the flame is supplied directly above the flame path, the flame continues to burn incompletely and causes soot to adhere to the inner wall of the secondary combustion section. be.

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 which is attached to the upper part between the outer flame tube and the outer tube of the combustion tube constituting the primary combustion section. The inner peripheral edge of the dividing plate is attached to the outside of the outer peripheral edge of this dividing plate so as to suppress the introduction of outside air directly above the flame path of the primary combustion part. An annular ventilation passage leading into the secondary combustion section is formed independent of the passage.

(Function) In the oil combustion appliance according to the present invention, a necessary and sufficient amount of air is supplied through the annular ventilation path formed outside the outer peripheral edge of the partition plate independently of the ventilation path to the primary combustion section. However, for diffusive combustion in the secondary combustion section, the time for reaction and convection with oxygen is extended, and the surplus is exhausted as it is, so that a stable combustion state can always be obtained.

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

In Fig. 1, 11 is a fixed tank, and the stand 1
It is installed on 2. 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. 14 is supported so that it can move up and down.
Further, a core guide cap 16 having a ventilation hole is attached to the upper end opening of the core guide 13.

18 is a primary combustion section, and the above-mentioned core guide cap 1
The burner basket 19 has a combustion tube 19 placed on a fire pan consisting of the outer edge of the burner basket 6 and the upper bent portion of the burner basket 15. This combustion tube 19 consists of an inner flame tube 20, an outer flame tube 21, and an outer flame tube 2, which are arranged concentrically with a space maintained between them.
2, the lower end of the inner flame tube 20 is placed on the outer edge of the core 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. Further, a large number of small holes are formed on the peripheral surfaces of the inner flame tube 20 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 part of the outer cylinder 22 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 made of an iron plate or the like. It is marked 22B. 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 inner flame tube 20, outer flame tube 21, and outer flame tube 2
The lower part of the sprayer tube 2 is interconnected with the lower part of the sprayer tube 28, which will be described later, by a cross pin.

The sprayer tube 28 has a lower end that protrudes into the inner flame tube 20 to communicate therewith, and an upper end that has a diffusion plate 29 that extends into the secondary combustion section 30 formed above the primary combustion section 18. To position. The outer periphery of this spray tube 28 and the inner flame tube 20
The gap formed between the upper end and the upper end is covered by an inner flame cylinder 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 spacer 37 having a length corresponding to the height of the primary combustion section 18 is attached to the outer periphery of the lower half of the column. . Reference numeral 39 denotes an annular base plate, which is provided on the spacer 37, that is, at the boundary between the primary 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 supported and fixed by a glass flame tube support member 43 fixed to the upper end of the support column 35. has been done. Note that an opening 44 through which combustion exhaust gas flows out is formed in the upper circumferential side of the glass flame tube support member 43, and an upper plate 45 is fitted onto the upper part of the opening 44, which is connected to the body base cover 36. A guard 46 is provided in between.

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. An annular air passage 49 is formed outside of this outer peripheral edge 48a and is open to the outside air and communicates from the periphery of the combustion tube 19 into the secondary combustion part 30 independently of the air passage of the primary combustion part 18. .

In the above configuration, when performing combustion operation,
First, the lamp wick 14 is raised to the position shown in FIG. 1 by a vertical drive mechanism (not shown), and is exposed between the inner flame tube 20 and the outer flame tube 21.

Although not shown, for example, an ignition device is built in the right side in the figure surrounded by the body base cover 36, and by operating the ignition lever, the right side of the combustion tube 19 in the figure is lifted up and the ignition heater is activated. Press the tip against the top of the wick 14, and
ignite the kerosene that is sucked up by capillary action at the top of the cylinder.

After the above-mentioned ignition, in the primary combustion part 18, the vaporized gas is combusted between the inner flame tube 20 and the outer flame tube 21 above the wick 14 together with the air from the many small holes provided in the peripheral walls of these, and a blue gas is burned. Premixed combustion of the 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 spray tube 28. Fresh air supplied into the secondary combustion section 30 from an annular air passage 49 formed outside the partition plate 48 is also used as secondary air for this diffusive combustion.

Conventionally, air guided outward by the diffusion plate 29 and air introduced directly above the flame path from outside the combustion tube 19 were supplied for diffusive combustion, 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 the flame did not spread and there was a limit to how much combustion consumption could be increased.

On the other hand, in the present invention, the secondary air is separated by the partition plate 48.
Since outside air is directly supplied through the annular ventilation passage 49 formed outside of the combustion chamber and independent from the ventilation passage to the primary combustion section, the reaction residence time of the premixed combustion gas portion with oxygen is extended, and the oxygen is sufficiently absorbed. can be supplied to perform diffusion combustion. In addition, the annular ventilation passage 49 on the outside of the partition plate 48 can secure a sufficient area due to its structure, so even if the incompletely combusted gas increases due to the "strong" combustion state, a sufficient amount of gas can be generated. It can supply secondary air and follow standing flames sufficiently to prevent soot from adhering to the air. Moreover, since this secondary air is supplied to the secondary combustion section 30 from the outside,
Completely mix only the amount necessary for the premixed combustion gas amount,
Unnecessary (excess) air is exhausted through the upper opening 44 without touching the flame. Therefore, even if the flame is shortened by making the combustion state "weak" and a large amount of secondary air is not required, the extra air does not come into contact with the flame, so the flame will not be cooled down. Furthermore, in this case, the temperature inside the combustion chamber decreases because the excess air is exhausted as it is.
The generation of NO ₂ is reduced.

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

Further, in the above configuration, it has been confirmed that the consumption amount changes depending on the outer diameter of the partition plate 48. 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 separated via the annular air passage 49, and therefore, during assembly etc., the combustion tube 19
You can also insert and remove the assembly from the top.
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 conventional case. In other words, there are no restrictions on the ignition means, and costs can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, the secondary combustion section that diffuses and burns the incompletely combusted gas from the primary combustion section is provided with the annular ventilation passage to the primary combustion part and an independent ventilation passage, which is necessary for combustion. supply only the amount of air,
I decided to exhaust the excess air as it is, so
Without adjusting the amount of air, it is possible to always obtain complete combustion with a stable flame, such as "weak", "strong", and increased combustion consumption, and the assembly configuration can be simplified.

[Brief explanation of the drawing]

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...Primary combustion section, 19...Combustion tube, 20...
...Inner flame tube, 21...Outer flame tube, 22...Outer flame tube, 30
...Secondary combustion section, 33...Burner cap, 48
...Dividing plate, 48a...outer periphery, 48b...inner periphery, 49...annular ventilation path.

Claims (1)

[Claims] 1. A primary combustion section having a combustion tube consisting of an inner flame tube, an outer flame tube, and an outer tube, and a diffusion combustion of incompletely combusted gas rising from the primary combustion section located above the primary combustion section. The secondary combustion part has an annular shape, and its inner circumferential edge is attached to a burner cap that is 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 outside the outer circumference of the combustion tube. an annular ventilation passage leading into the secondary combustion part, independent of the ventilation passage from the periphery of the combustion tube to the primary combustion part, is provided outside the outer peripheral edge of the division plate; An oil-burning appliance characterized by: