Ignition device and burner containing it

Abstract

This invention discloses an ignition device and a burner containing the same. The ignition device includes an ignition needle and a grounding metal ring. The ignition needle includes an insulator, an electrode needle body, and an electrical connecting wire. The insulator covers the bottom of the electrode needle body, with the top of the electrode needle body protruding from the top surface of the insulator. The grounding metal ring is fitted onto the outer circumferential surface of the insulator. The electrical connecting wire is electrically connected to the bottom end of the electrode needle body. The projection of the bottom end of the electrode needle body along the radial direction of the ignition needle lies within the grounding metal ring. The outer circumferential surface of the insulator has an inwardly recessed compression groove, within which the grounding metal ring is located. By providing a compression groove on the outer circumferential surface of the insulator, with the grounding metal ring fitted within it, and the bottom end of the electrode needle body positioned within the grounding metal ring, the bottom end of the electrode needle body will penetrate the sidewall of the insulator, generating a weak discharge to the grounding metal ring. At this time, the head of the electrode needle body can penetrate the air and discharge to the burner cap, thereby greatly improving the ignition success rate.

Description

Technical Field

[0001] The present invention relates to an ignition device and a burner comprising the same. Background Technology

[0002] Most existing gas stoves use an ignition needle pulse discharge method to ignite the gas. The ignition needle is usually located near the burner outlet of the gas stove. During ignition, the discharge end of the ignition needle generates a high voltage, which breaks down the air between the needle and the burner cap to form an electric arc, thereby igniting the gas ejected from the burner outlet and achieving ignition of the gas stove.

[0003] Currently, after a period of use, oil and other contaminants can accumulate on the ignition needle of a gas stove, causing it to become greasy and unable to generate a continuous ignition spark, resulting in ignition failure. Even with a shield on the burner cap to cover the tip of the ignition needle, some oil will inevitably remain, significantly impacting the ignition success rate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the ignition needle is easily covered with a layer of oil stains, which causes the ignition spark to fail to be generated normally and continuously, resulting in ignition failure. The present invention provides an ignition device and a burner including the present invention.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An ignition device is characterized in that it includes an ignition needle and a grounding metal ring. The ignition needle includes an insulator, an electrode needle body, and an electrical connecting wire. The insulator covers the bottom of the electrode needle body, and the top of the electrode needle body protrudes from the top surface of the insulator. The grounding metal ring is sleeved on the outer peripheral surface of the insulator. The electrical connecting wire is electrically connected to the bottom end of the electrode needle body. The projection of the bottom end of the electrode needle body along the radial direction of the ignition needle is located within the grounding metal ring. The outer peripheral surface of the insulator has an inwardly recessed compression groove, and the grounding metal ring is located within the compression groove.

[0007] In this embodiment, the above-described structure is adopted. Under normal circumstances, the head of the ignition needle is not contaminated. During ignition, the head of the electrode needle has high energy and will discharge to the nearest inner ring burner to generate an electric spark, thereby achieving ignition. When oil contaminates the tip of the electrode needle, it generally cannot generate high voltage to break down the air and discharge to the inner ring of the ignition cap. However, by placing a grounding metal ring around the outer circumference of the insulator, the projection of the bottom of the electrode needle along the radial direction of the ignition needle is located inside the grounding metal ring. This allows the bottom of the electrode needle to be positioned within the grounding metal ring. When the energy at the tip of the electrode needle is sufficient, although it cannot break down the oil contaminant to discharge to the inner ring of the ignition cap, the bottom of the electrode needle will instead break down the side wall of the insulator to generate a weak discharge to the grounding metal ring. In other words, the voltage of the electrode needle is too high, and the insulation performance of the insulator is insufficient to block the discharge, allowing the electrode needle to slightly break down the insulator. Through the grounding of the grounding metal ring, a circuit is formed, at which point the electrode needle will carry a high discharge voltage, enabling the tip of the electrode needle to break down the air and discharge to the inner ring of the ignition cap, thereby greatly improving the ignition success rate. Meanwhile, by opening a compression groove on the outer circumference of the insulator and placing the grounding metal ring inside the compression groove, the distance between the bottom of the compression groove and the bottom of the electrode needle body is made closer. In other words, the sidewall thickness of the compression groove in the insulator is thinner, and the distance between the grounding metal ring and the bottom of the electrode needle body is closer. This greatly reduces the difficulty for the bottom of the electrode needle body to penetrate the sidewall of the insulator and discharge to the grounding metal ring, further improving the ignition success rate of the ignition device.

[0008] Preferably, the bottom end of the electrode needle body is located at the midpoint between the top end and the bottom end of the grounding metal ring.

[0009] In this embodiment, the above-described structure is adopted. By positioning the bottom end of the electrode needle body in the middle of the grounding metal ring, the discharge area of ​​the bottom end of the electrode needle body to the grounding metal ring is maximized. In other words, the discharge of the grounding metal ring is a tip discharge, meaning that the electricity generated by the electrode needle body breaking down the insulator is generated from the bottom end of the electrode needle body. Considering all points from high to low around the circumference of the grounding metal ring, the weighted distance is the shortest, thus maximizing the discharge area. This allows the bottom end of the electrode needle body to generate a weak discharge to the grounding metal ring by breaking down the side wall of the insulator and forming a circuit. Consequently, the head of the electrode needle body generates a high discharge voltage that can break down the air and discharge to the inner ring flame cap, further improving the ignition success rate of the ignition device.

[0010] Preferably, the top end of the insulator has an umbrella-shaped structure, and the grounding metal ring is fitted onto the insulator from the bottom end, with the top end of the grounding metal ring abutting against the bottom surface of the umbrella-shaped structure, so that the umbrella-shaped structure can be used to shield the grounding metal ring.

[0011] In this embodiment, the umbrella-shaped structure, as described above, acts as a shield and guide for the grounding metal ring, preventing oil from dripping onto its top. This effectively avoids the grounding metal ring being completely encased in oil, which would severely affect normal ignition and discharge, greatly improving the stability of the ignition device. Simultaneously, the umbrella-shaped structure directs the shielded oil into the interior of the grounding metal ring, specifically into the gap between the grounding metal ring and the insulator, ensuring the stability of the grounding metal ring and enhancing the ignition effect.

[0012] Preferably, the bottom surface of the umbrella-shaped structure has an inwardly recessed groove, and the top end of the grounding metal ring is inserted into the groove.

[0013] In this embodiment, using the above-described structure, the top end of the grounding metal ring is inserted into the slot during assembly. Even with a lot of oil, the oil will only adhere to the outside of the grounding metal ring and cannot enter the inside, ensuring the stability of the grounding metal ring and thus improving the ignition success rate of the ignition device. Simultaneously, precise positioning and installation effectively prevent the grounding metal ring from shifting or misaligning during use, ensuring a weak discharge between the bottom end of the electrode needle and the grounding metal ring, further improving the ignition success rate of the ignition device.

[0014] Preferably, the inner diameter of the grounding metal ring is 0.1 to 0.3 mm larger than the outer diameter of the insulator at the location corresponding to the grounding metal ring on the outer circumference surface; more preferably, the inner diameter of the grounding metal ring is 0.2 mm larger than the outer diameter of the insulator at the location corresponding to the grounding metal ring on the outer circumference surface.

[0015] In this embodiment, using the above-described structure, during installation, the grounding metal ring is fitted onto the insulator from the bottom end upwards, so that the top end of the grounding metal ring is inserted into the slot and located in the compression groove. This ensures the normal installation of the grounding metal ring. At the same time, it effectively avoids the difficulty of the electrode needle breaking through the insulator and discharging to the grounding metal ring due to an excessively large gap between the grounding metal ring and the insulator, thus greatly improving the ignition success rate of the ignition device.

[0016] Preferably, the minimum distance between the top end of the grounding metal ring and the head of the electrode needle exposed in the insulator is H, where 6mm < H; more preferably, 10mm ≤ H ≤ 15mm.

[0017] Preferably, the minimum distance between the top end of the grounding metal ring and the head of the electrode needle body is greater than the minimum distance between the head of the electrode needle body and the flame cap.

[0018] In this embodiment, the above-described structure ensures that the head of the electrode needle discharges to the protrusion, effectively preventing the head of the electrode needle from directly discharging to the uppermost exposed part of the outer wall of the grounding metal ring, thereby greatly improving the ignition success rate of the ignition device.

[0019] Preferably, the outer surface of the grounding metal ring is provided with a downwardly inclined guide groove;

[0020] And / or, the grounding metal ring is made of copper;

[0021] And / or, the thickness of the grounding metal ring is not less than 0.5 mm;

[0022] And / or, the height of the grounding metal ring is not less than 6mm.

[0023] In this embodiment, the above-described structure allows the oil to be guided out of the grounding metal ring via the flow channel, thereby removing the oil from the surface of the grounding metal ring more quickly. This also reduces the area of ​​oil adhering to the surface of the grounding metal ring, ensuring that even with a large amount of oil, the oil only adheres to the outer side of the grounding metal ring and does not completely cover it. This reduces the impact on ignition and ensures a high ignition success rate.

[0024] In addition, the grounding metal ring has a certain structural strength, which ensures the stability of the ignition device; and it is also low in cost.

[0025] A burner comprising an ignition device as described above.

[0026] In this embodiment, the above-described structure is adopted. By placing the grounding metal ring on the outer circumference of the insulator, the projection of the bottom end of the electrode needle body along the radial direction of the ignition needle is located inside the grounding metal ring. This allows the bottom end of the electrode needle body to penetrate the side wall of the insulator and generate a weak discharge to the grounding metal ring. Through the grounding of the grounding metal ring, a circuit is formed. At this time, the electrode needle body will carry a high discharge voltage, enabling the head of the electrode needle body to penetrate the air and discharge to the inner ring flame cap, thereby greatly improving the ignition success rate.

[0027] Preferably, the burner further includes a base, the ignition needle is mounted on the base, and the bottom surface of the grounding metal ring is sealed and abutted against the base.

[0028] In this embodiment, the above-described structure is adopted to prevent oil from flowing into the inner sleeve of the base, ensuring good grounding of the grounding metal ring, thereby improving the ignition effect of the ignition device.

[0029] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0030] The positive and progressive effects of this invention are as follows:

[0031] The ignition device and burner comprising the present invention, by having a compression groove on the outer peripheral surface of an insulator, a grounding metal ring is fitted inside the compression groove, and the bottom end of the electrode needle is set inside the grounding metal ring. If the head of the electrode needle cannot generate high voltage to break down the air and discharge to the burner cap due to oil or other contaminants, the bottom end of the electrode needle inside the insulator will instead break down the side wall of the insulator to generate a weak discharge to the grounding metal ring. Through the grounding of the grounding metal ring, a circuit is formed, and the electrode needle will carry a discharge high voltage, enabling the head of the electrode needle to break down the air and discharge to the burner cap, thereby greatly improving the ignition success rate. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the burner structure according to an embodiment of the present invention.

[0033] Figure 2 This is a partial structural schematic diagram of the burner according to an embodiment of the present invention.

[0034] Figure 3 for Figure 2 A magnified view of part A in the diagram.

[0035] Figure 4 This is a schematic diagram of the ignition device according to an embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram of the internal structure of the ignition device according to an embodiment of the present invention.

[0037] Figure 6 for Figure 5 A magnified view of part B in the diagram.

[0038] Explanation of reference numerals in the attached figures:

[0039] Ignition needle 1

[0040] Insulator 11

[0041] Umbrella structure 111

[0042] Card slot 112

[0043] Tightening groove 113

[0044] Electrode needle body 12

[0045] Electrical connection wire 13

[0046] Grounding metal ring 2

[0047] Guide channel 21

[0048] Base 10

[0049] Drain port 101

[0050] Inner ring fire cap 20

[0051] 201 bumps

[0052] Outer ring fire cap 30 Detailed Implementation

[0053] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0054] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an embodiment of the present invention discloses a burner, which includes an ignition device, a base 10, an inner ring burner cap 20 and an outer ring burner cap 30. The inner ring burner cap 20 and the outer ring burner cap 30 are both disposed on the base 10. The ignition device is mounted on the base 10 and discharges to the inner ring burner cap 20 to achieve ignition.

[0055] The ignition device includes an ignition needle 1 and a grounding metal ring 2. The ignition needle 1 includes an insulator 11, an electrode needle body 12, and an electrical connecting wire 13. The insulator 11 covers the bottom of the electrode needle body 12, and the top of the electrode needle body 12 is exposed on the top surface of the insulator 11. The grounding metal ring 2 is fitted on the outer peripheral surface of the insulator 11. The electrical connecting wire 13 is electrically connected to the bottom end of the electrode needle body 12. The projection of the bottom end of the electrode needle body 12 along the radial direction of the ignition needle 1 is located inside the grounding metal ring 2. The outer peripheral surface of the insulator 11 has an inwardly recessed compression groove 113, and the grounding metal ring 2 is located inside the compression groove 113.

[0056] The ignition needle 1 is mounted on the base 10 via an insulator 11. The electrode needle body 12 is connected to the battery via an electrical connection wire 13. The grounding metal ring 2 is directly abutted against the base 10 to achieve grounding. Under normal circumstances, the head of the ignition needle 1 is not contaminated, meaning the head of the electrode needle body 12 is not contaminated by oil or other substances. During ignition, the head of the electrode needle body 12 has high energy and will discharge to the nearest inner ring spark cap 20 to generate an electric spark, thus achieving ignition. When oil contaminates the head of the electrode needle body 12, it generally cannot generate high voltage to break down the air and discharge to the inner ring spark cap 20. By fitting the grounding metal ring 2 onto the outer circumference of the insulator 11, the projection of the bottom end of the electrode needle body 12 along the radial direction of the ignition needle 1 lies within the grounding metal ring 2. This allows the bottom end of the electrode needle body 12 to be positioned within the grounding metal ring 2. When the head of the electrode needle body 12 has sufficient energy, although it cannot break down the oil contaminant to discharge to the inner ring spark cap 20, The bottom of the electrode needle body 12 will then break through the side wall of the insulator 11 to generate a weak discharge to the grounding metal ring 2. That is, the voltage of the electrode needle body 12 is too high, and the insulation performance of the insulator 11 is not enough to block the insulation, so that the electrode needle body 12 can slightly break through the insulator 11 and form a circuit through the grounding of the grounding metal ring 2. At this time, the electrode needle body 12 will carry a discharge high voltage, so that the head of the electrode needle body 12 can break through the air and discharge to the inner ring flame cap 20, thereby greatly improving the ignition success rate.

[0057] By providing a compression groove 113 on the outer circumferential surface of the insulator 11, and placing the grounding metal ring 2 within the compression groove 113, the distance between the bottom of the compression groove 113 and the bottom of the electrode needle body 12 is made closer. In other words, the sidewall thickness at the compression groove 113 in the insulator 11 is thinner, and the distance between the grounding metal ring 2 and the bottom of the electrode needle body 12 is closer. This greatly reduces the difficulty for the bottom of the electrode needle body 12 to penetrate the sidewall of the insulator 11 and discharge to the grounding metal ring 2, further improving the ignition success rate of the ignition device.

[0058] The bottom end of the electrode needle body 12 is located midway between the top and bottom ends of the grounding metal ring 2. The grounding metal ring 2 is annular and fits around the outer circumference of the insulator 11. The bottom end of the electrode needle body 12 is located inside the insulator 11. By positioning the bottom end of the electrode needle body 12 in the middle of the grounding metal ring 2, the discharge area of ​​the bottom end of the electrode needle body 12 to the grounding metal ring 2 is maximized. In other words, the discharge of the grounding metal ring 2 is a tip discharge. The electricity generated by the electrode needle body 12 breaking down the insulator 11 is generated at the bottom end of the electrode needle body 12. The weighted distance to all points from high to low around the circumference of the grounding metal ring 2 is the shortest, resulting in the largest discharge area. This allows the bottom end of the electrode needle body 12 to generate a weak discharge to the grounding metal ring 2 by breaking down the sidewall of the insulator 11 and forming a circuit. This enables the head of the electrode needle body 12 to generate a high discharge voltage that can break down the air and discharge to the inner ring flame cap 20, further improving the ignition success rate of the ignition device.

[0059] Preferably, the bottom end of the electrode needle body 12 is located at the center point inside the grounding metal ring 2. Based on the above conditions, the grounding metal ring 2 also needs a certain vertical height, and the height of the grounding metal ring 2 is not less than 6mm.

[0060] In this embodiment, the top of the insulator 11 has an umbrella-shaped structure 111. The grounding metal ring 2 is fitted onto the insulator 11 from its bottom end, with the top of the grounding metal ring 2 abutting against the bottom surface of the umbrella-shaped structure 111, so that the umbrella-shaped structure 111 can shield the grounding metal ring 2. The umbrella-shaped structure 111 will shield and guide the grounding metal ring 2, preventing oil from dripping onto the top of the grounding metal ring 2. This effectively avoids the grounding metal ring 2 being completely covered by oil, which would seriously affect normal ignition and discharge, and greatly improves the stability of the ignition device. At the same time, the umbrella-shaped structure 111 allows the shielding oil to enter into the interior of the grounding metal ring 2, that is, into the gap between the grounding metal ring 2 and the insulator 11, ensuring the stability of the grounding metal ring 2 and improving the ignition effect.

[0061] The top of the insulator 11 acts as a guide through the umbrella-shaped structure 111, allowing oil to flow outwards and downwards. The umbrella-shaped structure 111 has an inclination angle of 30-40 degrees, with almost no horizontal surface. When oil or other substances drip onto the umbrella-shaped structure 111, they can flow directly downwards along the steep slope, preventing oil from sticking to the head of the ignition needle 1. Preferably, the inclination angle of the umbrella-shaped structure 111 is 35 degrees.

[0062] like Figure 5As shown, the bottom surface of the umbrella-shaped structure 111 has an inwardly recessed groove 112, into which the top end of the grounding metal ring 2 is inserted. During assembly, the top end of the grounding metal ring 2 is inserted into the groove 112, ensuring that even with heavy oil contamination, the oil only adheres to the outside of the grounding metal ring 2 and cannot enter its interior, thus guaranteeing its stability and improving the ignition success rate of the ignition device. Simultaneously, inserting the top end of the grounding metal ring 2 into the groove 112 achieves precise positioning and installation, effectively preventing misalignment during use and ensuring a weak discharge between the bottom end of the electrode needle body 12 and the grounding metal ring 2, further improving the ignition success rate of the ignition device.

[0063] like Figure 2 , Figure 3 and Figure 4 As shown, the outer surface of the grounding metal ring 2 has a downwardly extending guide groove 21. When oil flows down the outer wall from the tip of the ignition needle 1, the guide groove 21 can guide the oil out of the grounding metal ring 2, thereby draining the oil from the surface of the grounding metal ring 2 more quickly. At the same time, it reduces the adhesion area of ​​the oil on the surface of the grounding metal ring 2, so that even if there is a lot of oil, the oil will only stick to the outside of the grounding metal ring 2 and will not completely cover the grounding metal ring 2, thereby reducing the impact on ignition and ensuring the ignition success rate.

[0064] In this embodiment, a drain port 101 is designed on the base 10, and the lowest point of the guide groove 21 intersects with and is connected to the drain port 101. The drain port 101 is located at the intersection of the outer ring flame cap 30 and the base 10. The guide groove 21 can guide the oil to the drain port 101, and the drain port 101 will increase the drainage speed and prevent the oil from accumulating at the junction of the two after flowing down.

[0065] The ignition needle 1 is mounted on the base 10 via an insulator 11, and the bottom surface of the grounding metal ring 2 is sealed and abuts against the base 10. Specifically, the bottom surface of the grounding metal ring 2 is flat, and the top surface of the outer sleeve on the base 10 that fixes the ignition needle 1 is also flat. The bottom surface of the grounding metal ring 2 and the top surface of the outer sleeve on the base 10 abut against each other to achieve a sealing fit, thereby preventing oil from flowing into the inner part of the outer sleeve on the base 10, ensuring good grounding of the grounding metal ring 2, and thus improving the ignition effect of the ignition device.

[0066] The inner diameter L2 of the grounding metal ring 2 needs to be as small as possible, slightly larger than the outer diameter L1 of the ignition needle 1 corresponding to the grounding metal ring 2. Specifically, the inner diameter L2 of the grounding metal ring 2 is 0.1–0.3 mm larger than the outer diameter L1 of the insulator 11 at the corresponding location on the outer circumference of the grounding metal ring 2. During installation, the grounding metal ring 2 is fitted onto the insulator 11 from the bottom upwards, so that the top of the grounding metal ring 2 is inserted into the slot 112 and located in the tightening groove 113. This ensures proper installation of the grounding metal ring 2 and effectively avoids excessive gap between the grounding metal ring 2 and the insulator 11, which would increase the difficulty of the electrode needle 12 breaking through the insulator 11 and discharging to the grounding metal ring 2, greatly improving the ignition success rate of the ignition device. Preferably, the inner diameter L2 of the grounding metal ring 2 is 0.2 mm larger than the outer diameter L1 of the insulator 11 at the corresponding location on the outer circumference of the grounding metal ring 2.

[0067] In this embodiment, a protrusion 201 is located below the inner ring burner cap 20. An electric arc is formed between the head of the electrode needle body 12 and the protrusion 201, thereby igniting the gas ejected from the inner ring burner cap 20. The distance between the top of the grounding metal ring 2 and the head of the electrode needle body 12 exposed on the insulator 11 is H, and the distance between the head of the electrode needle body 12 and the corresponding ignition protrusion 201 below the inner ring burner cap 20 is L. 6mm < H, and H > L, meaning the distance between the top of the grounding metal ring 2 and the head of the electrode needle body 12 exposed on the insulator 11 is greater than the distance between the head of the electrode needle body 12 and the corresponding ignition protrusion 201 below the burner cap. With 6mm < H, a distance sufficient to generate an electric spark under normal conditions is achieved. Furthermore, H > L, and the distance between the top of the grounding metal ring 2 and the head of the electrode needle body 12 exposed on the insulator 11 is greater than the distance between the head of the electrode needle body 12 and the corresponding ignition protrusion 201 under the inner ring flame cap 20. This ensures that the head of the electrode needle body 12 discharges to the protrusion 201, effectively preventing the head of the electrode needle body 12 from directly discharging to the uppermost part of the exposed outer wall of the grounding metal ring 2, thereby greatly improving the ignition success rate of the ignition device.

[0068] Preferably, 10mm ≤ H ≤ 15mm. The distance at which an electric spark can be generated under normal conditions varies slightly depending on the burner, therefore H ≥ 10mm; at the same time, the distance between the uppermost part of the exposed outer wall of the grounding metal ring 2 and the head of the electrode needle body 12 is controlled to be no more than 15mm to ensure the enhancement effect on ignition.

[0069] In this embodiment, the grounding metal ring 2 is made of copper, which has good electrical conductivity and is low in cost. The insulator 11 is made of ceramic, which has good insulation properties and is also low in cost.

[0070] The thickness of the grounding metal ring 2 is not less than 0.5mm, and the wall thickness of the grounding metal ring 2 is greater than or equal to 0.5mm, so that the grounding metal ring 2 has a certain structural strength and ensures the stability of the ignition device.

[0071] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An ignition device, characterized in that, It includes an ignition needle and a grounding metal ring. The ignition needle includes an insulator, an electrode needle body, and an electrical connecting wire. The insulator covers the bottom of the electrode needle body, and the top of the electrode needle body protrudes from the top surface of the insulator. The grounding metal ring is fitted onto the outer circumferential surface of the insulator. The electrical connecting wire is electrically connected to the bottom end of the electrode needle body. The projection of the bottom end of the electrode needle body along the radial direction of the ignition needle lies within the grounding metal ring. The outer circumferential surface of the insulator has an inwardly recessed compression groove, and the grounding metal ring is located within the compression groove. The bottom end of the electrode needle body is located at the midpoint between the top end and the bottom end of the grounding metal ring. The inner diameter of the grounding metal ring is 0.1–0.3 mm larger than the outer diameter of the insulator at the corresponding location on the outer circumferential surface of the insulator.

2. The ignition device as described in claim 1, characterized in that, The insulator has an umbrella-shaped structure at its top end. The grounding metal ring is fitted onto the insulator from its bottom end, and the top end of the grounding metal ring abuts against the bottom surface of the umbrella-shaped structure, so that the umbrella-shaped structure can shield the grounding metal ring.

3. The ignition device as described in claim 2, characterized in that, The bottom surface of the umbrella-shaped structure has an inwardly recessed groove, and the top end of the grounding metal ring is inserted into the groove.

4. The ignition device as described in claim 1, characterized in that, The inner diameter of the grounding metal ring is 0.2 mm larger than the outer diameter of the insulator at the location corresponding to the grounding metal ring on the outer circumference.

5. The ignition device as described in claim 1, characterized in that, The minimum distance between the top of the grounding metal ring and the head of the electrode needle exposed in the insulator is H, 6mm < H.

6. The ignition device as described in claim 5, characterized in that, 10mm≤H≤15mm.

7. The ignition device as described in claim 1, characterized in that, The minimum distance between the top of the grounding metal ring and the head of the electrode needle body is greater than the minimum distance between the head of the electrode needle body and the flame cap.

8. The ignition device as described in claim 1, characterized in that, The outer surface of the grounding metal ring is provided with a downwardly inclined guide groove; And / or, the grounding metal ring is made of copper; And / or, the thickness of the grounding metal ring is not less than 0.5 mm; And / or, the height of the grounding metal ring is not less than 6mm.

9. A burner, characterized in that, It includes the ignition device as described in any one of claims 1-8.

10. The burner as claimed in claim 9, characterized in that, The burner also includes a base, the ignition needle is mounted on the base, and the bottom surface of the grounding metal ring is sealed and abutted against the base.

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