Discharge ignition device for oil burners

Abstract

To provide a discharge type ignition device of a petroleum burner, which is not easily influenced by the change of a wick height and is capable of achieving a stable ignition performance.SOLUTION: A wick 5 is mounted in a gap in a wick holding cylinder 4, a discharge electrode 6 is attached to a position opposite to the side face of the wick 5 lifted and exposed, and a counter electrode 7 is disposed above the discharge electrode 6. The discharge electrode 6 is shaped so that the tip 6a thereof is tilted at a prescribed angle toward an outer cylinder 3 of the wick, with a bent section 6b of the discharge electrode 6 being positioned on the inner side relative to the wick 5, and the tip 6a protruding outward from the side face of the wick 5 at a position lower than the upper end of the wick 5. A discharge spark generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7, is formed along the side face and the vicinity of the upper end of the wick 5, to ignite fuel supplied to the upper end of the wick 5. The wick 5 present on the periphery of the discharge electrode 6 is disintegrated in the process of lifting the wick 5, and thereby gaps are formed between the fibers constituting the wick 5 to allow air necessary for igniting fuel, to exist in the inside of the wick 5.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric discharge ignition device for an oil burner, which ignites a wick by utilizing electric discharge. [Background technology]

[0002] There are ignition devices for oil burners that use a dry cell battery as the power source, and generate a spark between an ignition discharge electrode and an opposing electrode to ignite the wick. When using a dry cell battery as the power source, there is a problem that the spark caused by the discharge is weak and the power supply voltage fluctuates greatly. For this reason, it was necessary to devise a way to maintain the dimensions of the wick and the electrode in the optimal position by arranging the discharge electrode so that it touches the side of the wick or is slightly buried in it.

[0003] Because the wick is made of fiber, it is prone to deformation, and even if the electrode is attached accurately, it is difficult to maintain its positional relationship with the electrode. If the height of the wick changes or the shape of the tip of the wick becomes deformed, causing a slight misalignment between the positional relationship between the wick and the discharge electrode, the spark may separate from the wick even though a discharge occurs, and no ignition may occur. Alternatively, the electrode may become buried in the wick, causing only white smoke to come out and no ignition to occur.

[0004] Therefore, as a structure to improve the reliability of ignition, Patent Document 1 proposes attaching a part for pressing the side of the wick separately from the discharge electrode, while Patent Document 2 proposes directly pressing the side of the wick by bringing a discharge electrode with its tip inclined toward the wick into contact with the weft of the wick. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-341642 [Patent Document 2] JP 2014-163584 A Summary of the Invention [Problem to be solved by the invention]

[0006] Both Patent Documents 1 and 2 aim to improve the reliability of ignition by preventing the discharge electrode from being buried in the wick, but in the structure of Patent Document 1, the parts for pushing the sides of the wick may impede the flow of combustion air and deteriorate combustion. In addition, the number of parts increases, leading to increased costs.

[0007] On the other hand, in the case of Patent Document 2, the discharge electrode is brought into contact with the weft of the wick and directly presses against the side of the wick, so there are no components that impede the flow of combustion air, which makes it possible to achieve both reliable ignition and stable combustion. However, since the wick height and the position of the weft of the wick vary depending on the model of oil burner, it is difficult to accommodate all models, and a different measure was necessary for models in which the weft of the wick is lower than the attachment position of the discharge electrode. [Means for solving the problem]

[0008] The present invention solves the above-mentioned problems, and comprises a wick 5 mounted in the gap of a wick-accommodating tube 4 consisting of a wick inner tube 2 and a wick outer tube 3 so as to be movable up and down, a discharge electrode 6 arranged in a position facing the side of the wick 5 facing the wick outer tube 3 when it has been raised, and a counter electrode 7 arranged above the discharge electrode 6 on the wick outer tube 3 side, and an insulator 8 covering the outer periphery of the discharge electrode 6 is provided so as to be insulated from the counter electrode 7, a gap is formed between the upper part of the wick outer tube 3 and the side of the raised wick 5, and an ignition window 3a is formed in that part of the wick outer tube 3, and the discharge electrode 6 is attached facing the wick 5 with the insulator 8 fitted into the ignition window 3a, In an oil burner in which the wick 5 is protruded above the wick housing tube 4 and a discharge spark is generated between the discharge electrode 6 and the opposing electrode 7 to ignite the wick 5, the discharge electrode 6 has a shape in which the tip 6a is inclined at a predetermined angle toward the wick outer tube 3, the bent portion 6b is located inside the wick 5, and the tip 6a protrudes from the side of the wick 5 at a position lower than the upper end of the wick 5, and the wick 5 around the discharge electrode 6 is scattered as the wick 5 rises, so that gaps are formed between the threads that make up the wick 5. This is a discharge ignition device for an oil burner, characterized in that

[0009] In addition, since air for combustion is present in the gaps formed between the threads of the wick 5, ignition failure due to lack of air does not occur, and the reliability of ignition is improved.

[0010] Furthermore, since the length dimension between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 is set to be shorter than the length dimension between the tip 6a of the discharge electrode 6 and the core outer tube 3, a discharge spark can be reliably generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7.

[0011] Furthermore, by positioning the tip 7a of the counter electrode 7 closer to the core outer tube 3 than the core 5, it is possible to prevent the counter electrode 7 from being buried in the core 5 in models in which the core height is set high.

[0012] Furthermore, since the tip 7a of the counter electrode 7 is located within a range between an extension of the tip 6a of the discharge electrode 6 to directly above the tip 6a of the discharge electrode 6, the discharge spark generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 does not move too far away from the wick 5, and can ignite the fuel in the wick 5. Effect of the Invention

[0013] The discharge ignition device of this invention is unaffected by changes in wick height or deformation of the tip shape of the wick 5, and can reliably ignite the fuel in the wick 5 with the discharge spark generated between the discharge electrode 6 and the counter electrode 7 to start combustion. Furthermore, because the air necessary for igniting the fuel is present in the gap around the discharge electrode 6 of the wick 5, even if a discharge spark is generated inside the wick 5, it no longer happens that ignition is not possible and only white smoke is produced, improving the reliability of ignition.

[0014] Also, in order to prevent discharge sparks from flying from the discharge electrode 6 to the wick outer tube 3, the length between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 is set to be shorter than the length between the tip 6a of the discharge electrode 6 and the wick outer tube 3. However, because the discharge electrode 6 of the present invention has a shape such that its tip 6a is positioned closest to the wick outer tube 3, it is easier to adjust the positions of the discharge electrode 6 and the counter electrode 7 than with conventional products, leading to improved productivity.

[0015] Furthermore, in models in which the upper end of the wick 5 is designed to be higher, the tip 7a of the counter electrode 7 is positioned closer to the wick outer cylinder 3 than the wick 5, thereby realizing a structure in which the counter electrode 7 is not buried in the wick 5 while keeping the length between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 shorter than the length between the tip 6a of the discharge electrode 6 and the wick outer cylinder 3. As a result, discharge sparks generated from the discharge electrode 6 do not head toward the inside of the wick outer cylinder 3 or wick 5, but are formed along the side of the wick 5 toward the counter electrode 7, improving the reliability of ignition.

[0016] Furthermore, when the tip 7a of the counter electrode 7 is provided closer to the wick outer tube 3 than the wick 5, the tip 7a of the counter electrode 7 is set to be located within the range between the extension of the tip 6a of the discharge electrode 6 to directly above the tip 6a of the discharge electrode 6, so that the discharge sparks generated between the discharge electrode 6 and the counter electrode 7 do not move far away from the wick 5, thereby improving the reliability of ignition. [Brief description of the drawings]

[0017] [Figure 1] 1 is a vertical sectional view of an ignition device portion of an oil burner showing an embodiment of the present invention. [Diagram 2] 1 is a plan view of an ignition device portion of an oil burner showing an embodiment of the present invention. FIG. [Diagram 3] FIG. 4 is a vertical sectional view of an ignition device portion of an oil burner showing another embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of an oil burner showing an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of the present invention will be described with reference to the drawings.

[0019] The oil burner comprises a fuel tank 1 for storing fuel, a wick housing tube 4 located at the top of the fuel tank 1, a wick 5 mounted in the gap of the wick housing tube 4 so as to be movable up and down, and a combustion tube 10 arranged above the wick 5.

[0020] The wick housing cylinder 4 is composed of a wick inner cylinder 2 formed from the bottom plate of the fuel tank 1, and a wick outer cylinder 3 attached to the top plate of the fuel tank 1. The lower part of the wick 5 attached to the gap of the wick housing cylinder 4 extends into the fuel in the fuel tank 1, and the lower part of the wick 5 sucks up the fuel in the fuel tank 1 and supplies it to the upper end of the wick 5.

[0021] A core up / down shaft 11 for operating the core up / down is attached to the side of the fuel tank 1, and a drive lever 12 for driving the core up / down shaft 11 is provided inside the fuel tank 1.

[0022] A lead holder 5a is attached to the outer periphery of the lead 5, and an engagement pin 5b provided on the lead holder 5a engages with a movable part of a drive lever 12. When the lead up / down shaft 11 is operated, the drive lever 12 rotates around the lead up / down shaft 11, and a force is applied to the engagement pin 5b, causing the lead 5 to move up and down along the lead housing tube 4.

[0023] The discharge electrode 6 that constitutes the ignition device is inserted through an ignition window 3a formed on the side of the wick outer tube 3 and is attached so as to face the wick 5 that protrudes upward from the wick housing tube 4, and the outer periphery of the discharge electrode 6 is covered with an insulator 8. The insulator 8 fits into the ignition window 3a to create an insulating state so that the discharge electrode 6 is not electrically connected to the wick outer tube 3 or the counter electrode 7 that is arranged above the discharge electrode 6.

[0024] The discharge electrode 6 extends from the insulator 8 towards the core 5 and is then bent so that the tip 6a faces upward, and the tip 6a is further arranged so as to be inclined towards the core outer tube 3. When the core 5 is raised to a position where it protrudes above the core storage tube 4, the bent portion 6b of the discharge electrode 6 is embedded in the core 5, and the tip 6a of the discharge electrode 6 is exposed towards the core outer tube 3 further than the side surface of the core 5, at a position lower than the upper end position of the core 5.

[0025] On the other hand, the counter electrode 7 is attached at a position shifted a certain distance laterally from the discharge electrode 6, extends upward from the upper end of the wick 5 and is then bent to face sideways, so that the tip 7a of the counter electrode 7 faces the tip 6a of the discharge electrode 6.When the wick 5 is raised to a position where it protrudes above the wick housing tube 4, the upper end of the wick 5 is positioned between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7.

[0026] With this configuration, the upper end of the wick 5 comes into contact with the lower part of the discharge electrode 6 as it rises, and the glass fiber threads that make up the wick 5 disperse, avoiding the discharge electrode 6, so that the wick 5 breaks up around the discharge electrode 6, creating gaps between the threads. Air then gets into the gaps that form between the threads of the wick 5, so that the inside of the wick 5 around the discharge electrode 6 contains more air than other parts.

[0027] The discharge electrode 6 is connected to an oscillator circuit 13, and when the ignition operation is performed, power is supplied to the oscillator circuit 13, which activates and generates a discharge spark between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7. The discharge spark is formed along the side surface of the wick 5 and near the upper end, and the part of the side surface of the wick 5 that is in contact with the tip 6a of the discharge electrode 6 is heated, causing the fuel supplied to the wick 5 to evaporate, and the discharge spark formed above it ignites it and starts combustion.

[0028] The core 5 made of glass fiber thread is prone to variation in length, and the upper end position of the core 5 may become high, but even in such cases, the tip 6a of the discharge electrode 6 is exposed on the side of the core 5, and the tip 6a of the discharge electrode 6 is not buried in the core 5.

[0029] Furthermore, when the upper end position of the wick 5 is raised, the discharge sparks generated between the discharge electrode 6 and the counter electrode 7 cannot reach the upper end of the wick 5, and discharge sparks may form inside the wick 5; however, since the gap formed inside the wick 5 around the discharge electrode 6 contains the air necessary for combustion, the fuel heated by the discharge electrode 6 and evaporated from the wick 5 is ignited by the discharge sparks formed inside the wick 5, and combustion can be initiated by the air present in the gap in the wick 5. This eliminates problems such as discharge sparks not igniting because they are far from the wick 5, or not igniting because they are buried inside the wick 5, and only producing white smoke without igniting.

[0030] In addition, in order to prevent discharge from the discharge electrode 6 toward the wick outer tube 3 and to reliably generate discharge sparks between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7, it is necessary to set the length dimension between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 shorter than the length dimension from the discharge electrode 6 to the wick outer tube 3.

[0031] The shape of the discharge electrode 6 of this invention is such that the bent portion 6b extends to the position farthest from the lead outer cylinder 3, from which the tip 6a approaches the lead outer cylinder 3, and because the tip 6a of the discharge electrode 6 is positioned closest to the lead outer cylinder 3, no discharge sparks will fly to the lead outer cylinder 3 from any part other than the tip 6a of the discharge electrode 6. Therefore, it is sufficient to compare the length dimension between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 with the length dimension from the tip 6a of the discharge electrode 6 to the lead outer cylinder 3, and it has become possible to easily adjust the dimension between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7.

[0032] In another embodiment of the present invention shown in Figure 3, the tip 7a of the counter electrode 7 is positioned closer to the core outer tube 3 than the core 5, and the length between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 at that position is set to be shorter than the length between the tip 6a of the discharge electrode 6 and the core outer tube 3.

[0033] The wick height of oil burners varies depending on the model and heat output, and in models designed with a higher wick height, there is a possibility that the upper end of the wick 5 will reach the height of the tip 7a of the counter electrode 7 due to variations in the length of the wick 5. In this case, if the tip 7a of the counter electrode 7 is buried in the wick 5, a discharge spark will be formed inside the wick 5, and even though there is air in the gap inside the wick 5, ignition failure will be likely to occur.

[0034] 3, even if the upper end position of the wick 5 is raised so as to reach the height of the tip 7a of the counter electrode 7, the tip 7a of the counter electrode 7 will not be buried in the wick 5. Therefore, even in the case of a model designed for a higher wick height, the position of the tip 7a of the counter electrode 7 can be set within a range in which the length between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 is shorter than the length from the tip 6a of the discharge electrode 6 to the wick outer cylinder 3.

[0035] Therefore, discharge sparks are not formed from the discharge electrode 6 toward the outer wick cylinder 3, and discharge sparks are reliably generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7. Furthermore, when a discharge spark is generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7, the fuel is heated and vaporized in the portion of the side of the wick 5 that is in contact with the vicinity of the tip 6a of the discharge electrode 6, and is ignited by the discharge sparks formed along the side of the wick 5, thereby commencing combustion.

[0036] Furthermore, when the position of the tip 7a of the counter electrode 7 is set closer to the wick outer cylinder 3 than the wick 5, it is preferable to set the position of the tip 7a of the counter electrode 7 within a range between an extension line L1 of the tip 6a of the discharge electrode 6 and L2 directly above the tip 6a of the discharge electrode 6. By setting the position of the tip 7a of the counter electrode 7 within the range between L1 and L2, the discharge spark generated between the tip 6a of the discharge electrode 6 and the tip 7a of the counter electrode 7 will not move too far from the wick 5, and the fuel evaporating from the wick 5 can be reliably ignited. [Explanation of symbols]

[0037] 2 core inner cylinder 3 Core outer cylinder 4 Core housing tube 5 core 6 Discharge electrode 6a Tip 6b Bending part 7 Counter Electrode 7a tip 8. Insulation

Claims

1. The lead is attached in a gap between the lead-containing cylinder composed of the lead inner cylinder and the lead outer cylinder so as to be movable up and down; A discharge electrode is disposed at a position facing the side surface of the exposed core on the core outer tube side. a counter electrode disposed above the discharge electrode on the core outer cylinder side; An insulator is provided to cover the outer periphery of the discharge electrode so as to form an insulated state with the counter electrode. A gap is formed between the upper portion of the wick outer tube and the side surface of the raised wick, and an ignition window is formed in the wick outer tube at that portion; The discharge electrode is attached to the wick by fitting the insulator into the ignition window, and is bent so that the tip of the discharge electrode faces upward. In an oil burner, the wick is protruded above the wick housing cylinder, and a discharge spark is generated between the discharge electrode and the counter electrode to ignite the wick, The tip of the discharge electrode is inclined at a predetermined angle toward the outer wick tube, the bent portion is located inside the wick, and the tip protrudes from the side of the wick 5 at a position lower than the upper end of the wick, A discharge ignition device for an oil burner, characterized in that the wick is dispersed around the discharge electrode during the process of lifting the wick, so that gaps are formed between the threads that make up the wick.

2. 2. The discharge ignition device for an oil burner according to claim 1, wherein air for combustion is present in the gaps formed between the threads of the wick.

3. 3. The discharge ignition device for an oil burner according to claim 1, wherein the length dimension between the tip of the discharge electrode and the tip of the counter electrode is set shorter than the length dimension between the tip of the discharge electrode and the wick outer tube.

4. 4. The discharge ignition device for an oil burner according to claim 1, wherein the tip of the counter electrode is located closer to the wick outer cylinder than the wick.

5. 5. The discharge ignition device for an oil burner according to claim 4, wherein the position of the tip of the counter electrode is within a range between an extension of the tip of the discharge electrode and directly above the tip of the discharge electrode.

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