JP2001041451A - Structure for securing discharge electrode of oil combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrode securing structure for a discharge igniter in an oil combustor where a wick is ignited utilizing discharge. SOLUTION: This electrode mount structure has with respect to an wick 3 raised by enlarging the upper part of an wick upper tube 2, a discharge electrode 4 facing the wick 3 through an ignition window 7 made at an upper part of the wick upper tube 2, and the wick 3 fired by generating spark discharge between the discharge electrode 4 and a counter electrode 5 disposed closely thereto. The discharge electrode 4 is covered with an insulator 6 on the outer circumference, a plurality of protrusions 7a are projected from the ignition window 7 toward the insulator 6 and abutted, at the forward end thereof, against the outer surface of the insulator 6 to form an air intake gap 8 between the inner edge of the ignition window 7 and the insulator 6. Air is supplied from the air intake gap 8 made uniformly in the outer circumference of the insulator 6 and unburnt gas spreading to the vicinity of the ignition window 7 is combusted thus preventing tar or carbon from adhering to the insulator 6 or the ignition window 7 before the wick 3 is fired by generating spark between the discharge electrode 4 and a counter electrode 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode mounting structure for a discharge igniter of an oil combustor, which ignites a wick by using discharge.

[0002]

2. Description of the Related Art As an igniter for an oil combustor, there is an igniter for generating a discharge spark by using a dry battery as a power source and a discharge electrode for ignition and a counter electrode to ignite a core.

[0003] In a device for igniting a core using discharge, when a dry cell is used as a power source, there is a problem that sparks due to the discharge are weak and the power source voltage fluctuates greatly. Furthermore, when the burning time elapses, the wick changes its height, becomes weaker, or adheres to tar, and delicate deformation occurs on the wick surface. For this reason, the dimensions of the core and the discharge electrode may be slightly displaced, and even if a discharge occurs, the spark will not separate from the core and will not ignite, or it will be too close to emit white smoke, making it difficult to ignite. was there.

As means for solving the above-mentioned drawbacks, an insulator is arranged around the discharge electrode or the counter electrode, the upper shape of the core outer cylinder is specified, and an ignition window is provided in this portion. An insulator is inserted into the ignition window hole and attached. At this time, there is a type in which the insulator is positioned by the ignition window hole, whereby the dimensions of the electrode and the core are maintained at the optimum positions, thereby enabling reliable ignition.

[0005]

However, since the ignition window functions to position the discharge electrode, the insulator must be in close contact with the inner edge of the ignition window, and the insulator facing the core is required. As in the case of the core outer cylinder, carbon and tar may adhere to the surface of the core outer cylinder.

The distance between the discharge electrode and the counter electrode is set to be larger than the distance between the ends of both electrodes, between the discharge electrode with the surface of the insulator interposed and the inner edge of the ignition window. When a high voltage is applied, discharge occurs between both electrodes. When conductive carbon or tar adheres to the surface of the insulator due to combustion, the insulation performance is reduced due to the adhesion of the tar, so that the core runs along the inner edge of the ignition window from the surface of the insulator to which the tar adheres. The complaint that electric discharge occurs in the outer cylinder and the core does not ignite is a problem.

Furthermore, an insulator for positioning the discharge electrode requires dimensional accuracy, but a insulator is generally used for the insulator, and the insulator tends to cause a dimensional error in the manufacturing process. Dimensional control was difficult, leading to an increase in cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a core 3 held vertically movably in a gap between a core inner cylinder 1 and a core outer cylinder 2, and Discharge electrode 4 disposed at a position opposite to the side of exposed core 3 on the side of core outer cylinder 2
And a counter electrode 5 disposed near the discharge electrode 4 on the core outer cylinder 2 side; and an insulator 6 covering the outer periphery of the discharge electrode 4 so as to form an insulated state with the counter electrode 5. The upper part of the cylinder 2 forms a gap between the core 3 and the raised core 3, and an ignition window 7 is provided in this part of the core outer cylinder 3. The discharge electrode 4 fits the insulator 6 into the ignition window 7. In a petroleum combustor that ignites the wick 3 by discharging the discharge spark between the discharge electrode 4 and the counter electrode 5 while attaching the tip to the wick 3 while viewing it,
Is larger than the outer diameter of the insulator 6 of the discharge electrode 4 to form an air inflow gap 8 between the ignition window 7 and the insulator 6, and the ignition window 7 has , A plurality of protrusions 7a are provided, and the protrusions 7a are positioned in contact with the outer periphery of the insulator 6 of the discharge electrode 4, and the air inflow gap 8 is formed over the entire outer periphery of the insulator 6 of the discharge electrode 4. It has a structure to do.

The projection 7a of the ignition window 7 is formed so as to be inclined inward or outward of the core outer cylinder 2, and the tip of the projection 7a is positioned at the insulator 6 of the discharge electrode 4. Is set to be smaller than the outer diameter of the insulating member 6a.
Is spread and comes into contact with the outer periphery of the insulator 6, so that even if the outer diameter of the insulator 6 is small, the discharge electrode 4 can be reliably positioned at the center of the ignition window hole 7 by the function of the projection 7 a. In addition, the dimensional control of the insulator 6 became easy.

Further, the rear portion of the insulator 6 of the discharge electrode 4 is mounted on a receiving edge 9 which is formed integrally with the core outer cylinder 2.
Is a bracket 9a of the receiving edge 9 and a protrusion 7 of the ignition window hole 7.
a, a driving means 10 is provided which enables the discharge electrode 4 to advance and retreat toward the wick 3, wherein the driving means 10 urges the discharge electrode 4 to the ignition position facing the wick 3 when ignited, Since the switching operation is performed between the burning position and the distant position from the core 3, even when a large amount of tar is accumulated on the surface of the insulator 6 due to long-term use or the like, the clean position outside the core outer cylinder 2 is maintained. Since the surface of the insulator 6 moves to the inside of the core outer cylinder 2 at the time of ignition, the insulation performance is improved.

[0011]

In a discharge type ignition device using a dry cell as a power source, the insulator 6 of the discharge electrode 4 is positioned by the ignition window hole 7 of the core outer cylinder 2 so that the core 3 and the electrode are made to have optimal dimensions. In addition, since the insulator 6 comes into close contact with the inner edge of the ignition window 7, there is a problem that the ignition performance is deteriorated by carbon or tar adhering to the surface of the insulator 6.

In the present invention, the inner diameter of the ignition window 7 is made larger than the outer diameter of the insulator 6 so that the insulator 6 of the discharge electrode 4 is not brought into close contact with the inner edge of the ignition window 7 of the core outer cylinder 2. Thus, an air inflow gap 8 is formed between the ignition window 7 and the insulator 6, and air flows in from the gap 8 to promote combustion near the ignition window 7, and the surface of the insulator 6 Carbon and tar do not adhere to the vicinity of the ignition window hole 7.

A plurality of projections 7a are provided in the ignition window 7 toward the center, and the projection 7a is brought into contact with the outer periphery of the insulator 6 so that the discharge electrode 4 is located in the center of the ignition window 7. Thus, a uniform air inflow gap 8 can be formed over the entire outer periphery of the insulator 6, and carbon and tar do not adhere to a specific portion.

If the protrusion 7a of the ignition window 7 is formed to be inclined and the tip of the protrusion 7a is set smaller than the outer diameter of the insulator 6 of the discharge electrode 4, the insulator 6 is ignited. When inserted into the window 7, the tip of the protruding portion 7a was easily expanded, and the discharge electrode 4 could be positioned reliably even if the outer diameter of the insulator 6 with which it came into contact varied widely.

Further, since the discharge electrode 4 is structured to advance and retreat toward the outside of the core outer cylinder 2 at the time of combustion by the driving means 10, the surface of the insulator 6 near the ignition window 7 at the ignition position has carbon No ignition or tar adhered, and excellent ignition performance was maintained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiment shown in the drawings. 3 is a core for sucking oil and supplying it to the combustion section, 1 is a core inner cylinder provided inside the core 3, and 2 is provided outside the core 3. A core 3 is accommodated in a gap between the core inner cylinder 1 and the core outer cylinder 2 so as to be vertically movable. The upper end of the core outer cylinder 2 is higher than the raised core 3 while forming a gap with the raised core 3.

Reference numeral 11 denotes a vertical axis of the core for performing vertical movement of the core.
Is a core up / down lever centered on the core up / down shaft 11,
When the core vertical shaft 11 is rotated by a core vertical device (not shown), the core vertical lever 12 is driven, and the core 3 is moved into the inner / outer cylinder 1.
2 Move up and down in the gap.

Reference numeral 13 denotes an oil tank in which the lower end of the core 3 provided below the inner / outer cylinders 1 and 2 is immersed, and 14 denotes an inner / outer cylinder 1
2 is a combustion cylinder mounted on the upper part of the cylinder 2. The wick 3 is exposed above the inner and outer cylinders 1 and 2 by the wick elevating device, and the wick 3 sucks up oil from the oil tank 13 and burns in the combustion cylinder 14. Is performed.

Reference numeral 4 denotes a discharge electrode disposed at a position facing the side surface of the exposed core 3 on the side of the core outer cylinder 2, and 5 denotes a counter electrode similarly fixed to the core outer cylinder 2 near the discharge electrode 4. Then, a spark is blown between the discharge electrode 4 and the counter electrode 5 to ignite the wick 3.

Reference numeral 6 denotes an insulator that protects the outer periphery of the discharge electrode 4 and creates an insulation state with the counter electrode 5. Reference numeral 7 denotes an ignition window provided in the upper part of the core outer cylinder 2. When the insulator 6 is inserted into the ignition window 7 from the outside of the core outer cylinder 2 toward the core 3, the insulator 6 is positioned by the ignition window 7, and the discharge electrode 4 and the core 3 are connected to each other so as to reliably ignite. It is held at the optimal position. Reference numeral 9 denotes a receiving edge formed outside the core outer cylinder 2, and 9 a denotes an insulator 6 positioned at the ignition window 7.
The bracket is attached to the receiving edge 9.

With the above configuration, the raised core 3
And the discharge electrode 4 and the counter electrode 5 can be accurately maintained in a positional relationship with each other, and can be ignited reliably even when a consumed dry battery is used as a power source.
Is positioned in close contact with the inner edge of the ignition window hole 7 of the core outer cylinder 2, so that the surface of the insulator 6 is electrically conductive and carbon and tar like the core outer cylinder 2 as combustion proceeds. Have a disadvantage that they are liable to adhere and cause ignition failure.

The present invention is a proposal for preventing carbon and tar from adhering to the surface of the insulator 6 and obtaining good ignition performance. Reference numeral 8 designates the inner diameter of the ignition window 7 outside the insulator 6. An air inflow gap provided between the ignition window hole 7 and the insulator 6 with a diameter larger than the diameter, and a plurality of protrusions 7a provided toward the center of the ignition window hole 7 are provided. The portion 7a is an insulator 6
By contacting the outer periphery of the electrode, a uniform air inflow gap 8 is provided between the ignition window hole 7 and the insulator 6 so that the insulator 6 can be positioned, and the discharge electrode 4 and the core 3 can be positioned. Are held at the optimum position.

At this time, the discharge electrode 2 is held at the center of the ignition window 7 and the air inflow gap 8 is formed on the entire outer periphery of the insulator 6. , Fresh air always flowed in and the combustion in the vicinity was promoted, and carbon and tar did not adhere to the vicinity of the insulator 6 of the discharge electrode 4 or the vicinity of the ignition window 7.

Also, as in the embodiment shown in FIG. 1, the protrusion 7a of the ignition window hole 7 is inclined toward the core 3 or not toward the outside of the core outer cylinder 2 (not shown). With this configuration, the distal end position of the protruding portion 7 a can be set smaller than the outer diameter of the insulator 6. For this reason, when the insulator 6 is inserted into the ignition window hole 7, the tip of the insulator 6 pushes and spreads the protrusion 7 a in the inclined direction, so that the protrusion 7 a easily spreads outward to the outer periphery of the insulator 6. In contact therewith, an air inflow gap is formed over the entire outer periphery of the insulator 6.

Furthermore, by setting the position of the tip of the protruding portion 7a smaller than the outer diameter of the insulator 6, even if a large dimensional error occurs in the outer diameter of the insulator 6, it is possible to easily cope with it, and to ensure the discharge electrode 4 Is positioned at the center of the ignition window hole 7, and even if the outer dimensions of the insulator 6 vary, this can be dealt with.

In the embodiment shown in FIGS. 4 and 5, the bracket 9a for holding the discharge electrode 4 functions as a positioning member without having an electrode fixing means.
Is driving means for making the discharge electrode 4 slightly movable toward the core 3. The driving means 10 connects the discharge electrode 4 positioned before the ignition and stopped from moving left and right to the core 3.
And the discharge electrode 4 moves away from the wick 3 during combustion.

As described above, when the driving means 10 moves the discharge electrode 4, the surface of the insulator 6 where there is no possibility of tar or carbon adhering outside the core outer cylinder 2 during normal combustion,
During the ignition operation, since the tar moves to the inside of the core outer cylinder 2, even if a large amount of tar or carbon adheres to the surface of the insulator 6 during combustion, the projection 7 a and the ignition window are transmitted along the surface of the insulator 6. Discharge current does not flow toward the hole 7, and deterioration of ignition performance can be suppressed to a minimum.

The driving means 10 changes the position of the discharge electrode 4 between the time of ignition and the time of normal combustion. Therefore, specifically, the driving means 10 generally has a link structure interlocked with the movement of the ignition knob. It is. The embodiment shown in FIGS. 4 and 5 does not use such a link structure, but relates to a driving means 10 for driving the discharge electrode 4 focusing on a rise in temperature during combustion. Reference numeral 16 denotes a shape memory spring that drives the bracket 4 toward the bracket 9a, and reference numeral 16 denotes a bias spring that is arranged between the bracket 9a and the discharge electrode 4 in balance with the shape memory spring 15.

The bias spring 16 has a function of driving the shape memory spring 15 in the compression direction at a low temperature, and drives the discharge electrode 4 in the direction of the core 3 when the oil combustor is extinguished and the temperature is low. The stepped portion 6 is pressed around the ignition window 7 to maintain the ignition position. When the oil combustor starts burning and the temperature rises, the shape memory spring 15 becomes the bias spring 16
The driving means 10 is configured by a shape memory spring 15 and a bias spring 16 while moving the discharge electrode 4 in the direction of the bracket 9a while compressing the pressure.

In the embodiment, since the core up / down lever 12 and the like are provided outside the core outer cylinder 2, the discharge electrode 4 is attached to the core outer cylinder 2 so that the ignition operation is easily linked with the vertical movement of the core. For example, the discharge electrode 4 can be attached to the core inner tube 1 by elongating the high-voltage power cord and passing it through the core inner tube 1. The same effect can be obtained with the core outer cylinder 2 irrespective of the mounting position.

[0031]

According to the present invention, the ignition window hole 7 of the core outer cylinder 2 is provided.
Is larger than the outer diameter of the insulator 6, and an air inflow gap 8 is formed between the insulator 6 and the ignition window 7 so that the insulator 6 does not come into close contact with the inner edge of the ignition window 7. As a result, air flows into the outer periphery of the insulator 6 from the air inflow gap 8,
Since the combustion of the unburned gas diffused in the vicinity is promoted, carbon and tar do not adhere to the surface of the insulator 6 or the protrusion 7a, and good ignition performance can be obtained with a simple structure.

Since a plurality of protrusions 7a are provided in the ignition window hole 7 toward the center, the protrusion 7a abuts on the outer periphery of the insulator 6 to connect the discharge electrode 4 to the center of the ignition window hole 7. Even if the outer diameter of the insulator 6 is made smaller than that of the ignition window 7 to form the air inflow gap 8, the dimensions of the discharge electrode 4 and the core 3 are always maintained at the optimum positions. And reliable ignition is possible.

If the projection 7a of the ignition window 7 is inclined and the tip of the projection 7a is set smaller than the outer diameter of the insulator 6, the projection 7a inclined when the insulator 6 is inserted.
a is such that the distal end of the discharge electrode 4 abuts on the outer periphery of the insulator 6 while being spread outward by the insulator 6, and the insulator 6 of the discharge electrode 4 can be located at the center of the ignition window hole 7.

Also, with this structure, the allowable range of the outer dimensions of the insulator 6 can be set to be large, and even if a insulator that easily causes a dimensional error is used for the insulator 6, the dimensional control is facilitated and the cost is reduced. And a simple configuration without changing the assembly process.

Further, since the discharge electrode 5 can be moved back and forth between a position at the time of ignition and a position at the time of combustion by the driving means 10, when a large amount of carbon or tar is generated, the protrusion 7a is formed.
Even if tar or carbon adheres near the gap 8 or the gap 8, a part of the outer surface of the insulator 6 at the time of ignition is located outside the core outer cylinder 2 during normal combustion and is in a clean state. The insulation performance can be maintained, and the performance of igniting the core 3 using the discharge electrode 4 is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an electrode fixing structure according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of the electrode fixing structure of the embodiment shown in FIG. 1 as viewed from a core position.

FIG. 3 is a sectional view of a main part of an oil combustor provided with an electrode fixing structure according to an embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing an electrode fixing structure according to another embodiment of the present invention.

5 is a cross-sectional view of a main part showing a normal combustion state of the electrode fixing structure of the embodiment shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 core inner cylinder 2 core outer cylinder 3 core 4 discharge electrode 5 counter electrode 6 insulator 7 ignition window hole 7a projection 8 air inflow gap 9 receiving edge 9a bracket 10 driving means

Claims (3)

[Claims] 1. A core 3 held vertically movably in a gap between a core inner cylinder 1 and a core outer cylinder 2, and a core 3 disposed at a position opposed to a side surface of the core 3 exposed and raised on the core outer cylinder 2 side. A discharge electrode 4, a counter electrode 5 disposed near the discharge electrode 4 on the core outer cylinder 2 side,
An insulator 6 covering the outer periphery of the discharge electrode 4 is provided so as to form an insulated state with the counter electrode 5, and a gap is formed between the upper part of the core outer cylinder 2 and the raised core 3 to form an insulating state. Core outer cylinder 3
The discharge electrode 4 is attached to the discharge electrode 4 while fitting the insulator 6 into the ignition window hole 7 with the tip thereof being viewed from the core 3.
In an oil burner that ignites the wick 3 by discharging a discharge spark between the discharge electrode 4 and the counter electrode 5, the inner diameter of the ignition window 7 is made larger than the outer diameter of the insulator 6 of the discharge electrode 4, An air inflow gap 8 is formed between the ignition window 7 and the insulator 6, and the ignition window 7 is provided with a plurality of protrusions 7a toward the center. A discharge electrode fixing structure for an oil-fired combustor, characterized in that the air inflow gap 8 is formed on the entire outer periphery of the insulator 6 of the discharge electrode 4 by being positioned in contact with the outer periphery of the insulator 6. 2. The projection 7a of the ignition window hole 7 is formed to be inclined inward or outward of the core outer cylinder 2, and the tip of the projection 7a is positioned at the insulator 6 of the discharge electrode 4. 2. The discharge electrode fixing structure for an oil combustor according to claim 1, wherein the outer diameter of the protrusion is set smaller than the outer diameter of the protrusion, and the tip of the protruding portion extends when the insulator is inserted and abuts on the outer periphery of the insulator. 3. A rear part of the insulator 6 of the discharge electrode 4 is provided on the core outer cylinder 2.
The discharge electrode 4 is positioned by the bracket 9a of the receiving edge 9 and the protruding portion 7a of the ignition window hole 7, and the discharge electrode 4 moves toward and away from the core 3. A driving means 10 for enabling the discharge means 4 to switch the discharge electrode 4 between an ignition position facing the wick 3 at the time of ignition and a combustion position distant from the wick 3 at the time of combustion. The structure for fixing a discharge electrode of an oil combustor according to claim 1.