Induction needle, side ignition device, gas burner and gas stove

Abstract

The utility model relates to a kind of induction needle for gas stove head side fire device, it is generally rod-like, including induction part and installation part, the installation part includes insertion section and positioning section, the diameter of the positioning section is greater than the installation hole;The induction part is columnar, coaxially arranged with the installation part, one end is fixed in the positioning section, the other end extends along the central axis in the direction away from the installation part.The utility model also provides a kind of side fire device using the induction needle, gas stove head and gas stove.The utility model can make the flameout protection of gas stove more accurate.

Description

Technical Field

[0001] This utility model relates to the field of gas equipment technology, and in particular to an induction needle, a side ignition device, a gas burner head, and a gas stove. Background Technology

[0002] The burner head is the most crucial component of a gas appliance, typically determining its power output and gas utilization rate. Existing burners, especially those in commercial gas appliances, usually have a constant-flame device installed beside or inside the burner to provide ignition and flameout protection. The ignition function allows for easy shut-off of the main gas supply, while enabling it to be turned on again when needed. The constant-flame device ignites the main gas, ensuring combustion within the burner without frequent ignition, making operation both safe and quiet. The flameout protection function automatically shuts off the main gas supply when the constant-flame device goes out, preventing gas leakage due to lack of ignition. This avoids potential hazards caused by gas leaks.

[0003] Chinese Patent No. 201920595988.9 discloses a safe ignition system and a gas appliance. The safe ignition system includes an ignition device and a flameout protection control device, wherein, for example... Figure 1 As shown, the ignition device includes an ignition needle 1, a ground wire 2, a sensing needle 3, and a gas guide tube. Both the ignition needle 1 and the sensing needle 3 are electrically connected to the power supply of the gas equipment and are located adjacent to the ground wire 2 and the gas guide tube. One end of the gas guide tube is equipped with a gas outlet nozzle 4, and the other end is connected to the gas source. A flow guide cap 5 is also provided at the upper end of the gas guide tube. The flow guide cap 5 has a flow guide cavity 51 and a flow guide port 52 connecting to the flow guide cavity 51. The gas outlet nozzle 4 is housed within the flow guide cavity 51 and is aligned with the gap between the ignition needle and the sensing needle. The sensing needle 3 has a fixing part, from which a temperature sensing part extends laterally. This temperature sensing part extends into the gap and can just contact the flame generated by the gas outlet nozzle 4, thereby achieving the purpose of determining whether the ignition device has extinguished.

[0004] The structure of the aforementioned prior art has the following defects:

[0005] Currently, the sensing needle 3 used in gas appliances is mainly a plasma sensing needle, whose working principle is based on the physical characteristics of flame ionization. When gas burns, the flame ionizes the surrounding air, generating plasma containing positive ions and electrons. These charged particles form a microcurrent (approximately 1uA) under the influence of an electric field, and the flameout protection device determines the flame state by detecting this current. In the aforementioned prior art, the temperature sensing part of the sensing needle 3 is arranged laterally to detect the flame state of the gas nozzle 4. Because the length of the flame changes significantly when the gas source pressure changes: when the gas source pressure is high, the flame is longer and may detach, if the temperature sensing part of the sensing needle 3 is too close to the gas nozzle 4, the sensing needle 3 will not reach the root of the flame, thus failing to contact the flame. If the temperature sensing part is located slightly further away from the gas nozzle 4, when the gas source pressure is low and the flame is short, the temperature sensing part will also fail to contact the flame. These two situations will cause the sensing needle 3 to be unable to detect the true state of the flame in real time, thus making it impossible to determine whether the open flame has been extinguished. This will lead to the flameout protection device making a misjudgment and shutting off the main gas, affecting the normal use of the gas stove. Utility Model Content

[0006] Therefore, it is necessary to provide a sensing needle, a side ignition device, a gas burner head, and a gas stove to solve the defects in the prior art, make the flameout protection of the gas stove more accurate, and thus improve the safety and reliability of the gas stove.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution.

[0008] This utility model provides a sensing needle for a gas burner side ignition device, which is generally rod-shaped and includes a sensing part and a mounting part. The gas burner side ignition device has a mounting hole, and the mounting part is adapted to be inserted into the mounting hole. The mounting part includes an insertion section and a positioning section, and the diameter of the positioning section is larger than that of the mounting hole. The sensing part is columnar and coaxially arranged with the mounting part. One end of the sensing part is fixed in the positioning section, and the other end extends along the central axis in a direction away from the mounting part.

[0009] In the aforementioned sensing needle, the mounting part has a through hole extending along the axial direction, and the sensing part is provided with a wire, one end of which is connected to the sensing part, and the other end passes through the through hole and is led out.

[0010] In the aforementioned sensing needle, the mounting part is made of high-temperature resistant ceramic material, and the sensing part is made of metal.

[0011] This utility model further provides a side ignition device for a gas burner, wherein the gas burner has a burner, and the side ignition device is disposed beside the burner; the side ignition device includes an ignition head, an ignition needle, a sensing needle, and an ignition cap; the ignition cap covers the ignition head, ignition needle, and sensing needle and has an opening on the side facing the inside of the burner; the combustible gas ejected from the nozzle is ignited by the ignition needle and ejected through the opening to ignite the combustible gas in the burner; the sensing needle is generally rod-shaped and includes a sensing part and a mounting part; the side ignition device for the gas burner has a mounting hole suitable for installing the sensing needle; the mounting part includes an insertion section and a positioning section, the diameter of the positioning section being larger than the mounting hole; the sensing part is columnar and coaxially arranged with the mounting part, one end of which is fixed inside the mounting part, and the other end extends along the central axis in a direction away from the mounting part; the end of the ignition head has a nozzle, which faces the sensing part.

[0012] In the aforementioned side-ignition device, the diameter of the sensing part is adapted to the inner diameter of the nozzle.

[0013] In the aforementioned side-ignition device, the ignition head, ignition needle, and sensing needle are arranged in a triangular pattern. The opening of the ignition cap is close to the gap between the ignition needle and the sensing needle, so that the combustible gas ejected from the nozzle can flow through the gap and be ejected from the opening after being ignited.

[0014] In the aforementioned side-ignition device, the ignition needle includes an ignition head that extends laterally toward the gap to ignite the combustible gas flowing through the gap.

[0015] In the aforementioned side-ignition device, the end of the ignition head extends to the vicinity of the surface of the sensing needle so as to form an electric arc with the sensing needle, thereby igniting the combustible gas in the gap.

[0016] This utility model also provides a gas burner head, which has the above-mentioned side ignition device.

[0017] This utility model also provides a gas stove, which uses the above-mentioned gas burner head.

[0018] This invention addresses the aforementioned deficiencies of existing induction needles by designing the sensing part of the needle in a columnar shape, coaxially aligned with the mounting part and directly opposite the nozzle of the ignition head. This allows the flame generated by the nozzle to directly hit the sensing part, ensuring the induction needle makes contact with the flame and significantly increasing the sensing area. It prevents issues such as unstable gas pressure causing a short induction needle or excessive gas pressure causing flame detachment, which could lead to misjudgment by the flameout protection circuit and accidental shut-off of the main gas, affecting the normal operation of the gas stove. This invention effectively improves the accuracy of the gas stove's flameout protection and enhances its safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a side-ignition device in the prior art;

[0020] Figure 2 This is a top view of a side-ignition device in the prior art;

[0021] Figure 3 This is a schematic diagram of the structure of a sensing needle in the prior art;

[0022] Figure 4 This is a three-dimensional structural diagram of a sensing needle in an embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional view of a sensing needle in an embodiment of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the side ignition device (with ignition cap removed) in Embodiment 2 of this utility model;

[0025] Figure 7 This is a top view of the side ignition device (with the ignition cap removed) in Embodiment 2 of this utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the gas burner head in Embodiment 3 of the utility model.

[0027] The purpose of this utility model, as well as its functions and principles, will be further explained in conjunction with the accompanying drawings in specific embodiments. Detailed Implementation

[0028] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details.

[0029] Example 1

[0030] like Figure 4 and 5As shown, this embodiment provides a sensing needle 1 for a side ignition device of a gas burner head. It is generally rod-shaped and includes a sensing part 11 and a mounting part 12. The side ignition device has a mounting base. The mounting part 12 is adapted to be inserted into a mounting hole provided in the mounting base. Specifically, the mounting part 12 includes an insertion section 121 and a positioning section 122. The diameter of the positioning section 122 is larger than that of the mounting hole. When the sensing needle 1 is inserted into the mounting hole from top to bottom, the positioning section 122 can fix the sensing needle 1 on the mounting base, preventing it from moving up and down, thereby determining the installation position of the sensing needle 1. In this embodiment, the sensing part 11 is columnar and coaxially arranged with the mounting part 12, located above the mounting part 12. One end (the lower end in the figure) is fixed in the positioning section 122, and the other end (the upper end in the figure) extends along the central axis in a direction away from the mounting part 12 (upwards in the figure).

[0031] In this embodiment, the sensing needle 1 can be made of a metal material such as stainless steel for the sensing part 11, while the mounting part 12 can be made of a high-temperature resistant ceramic material. The mounting part 12 has a through hole 123 extending axially, through which the sensing part 11 is connected to an external flameout protection circuit via a wire 111. One end of the wire 111 is connected to the tail of the sensing part 11, and the other end passes through the through hole 123 and extends outwards.

[0032] Compared to conventional induction needles, the induction needle in this embodiment lacks the horizontally arranged thin rod-shaped probe, and the sensing part 11 is thicker than that of conventional probes, thus having a larger temperature-sensing area. This allows for more reliable flame reflection and accurate flame detection, resulting in higher reliability of the flameout protection circuit and preventing false alarms that could shut off the main gas supply. Furthermore, because conventional induction needles have horizontally arranged probes, the installation direction of the probe must be considered during installation to ensure the optimal distance between the probe and the flame. This makes the installation of the induction needle more complex and cumbersome than traditional gas burners. In contrast, the gas burner using the induction needle 1 of this embodiment eliminates the need to adjust the direction of the induction needle during installation, making the installation of the induction needle much more convenient.

[0033] Example 2

[0034] Reference Figure 6 and 7As shown, this embodiment provides a side ignition device 10 for a gas burner head, employing the sensing needle described in Embodiment 1. The gas burner head has a burner 20 for burning combustible gas ejected from its interior. The side ignition device 10 is disposed beside the burner 20 and includes an ignition head 101, an ignition needle 102, a sensing needle 103, and an ignition cap (not shown). The ignition head 101 provides combustible gas, the ignition needle 102 ignites the combustible gas ejected from the ignition head 101, and the sensing needle 103 detects whether the flame at the ignition head 101 is extinguished. The ignition cap covers the ignition head 101, the ignition needle 102, and the sensing needle 103 and has an opening on the side facing the interior of the burner 20. The combustible gas ejected from the ignition head 101 is ignited by the ignition needle 102 and ejected through the opening to ignite the combustible gas inside the burner 20. The ignition head 101 has a nozzle 1011 at its end, which is directly opposite the sensing part 1031 of the sensing needle 103.

[0035] The flame ejected from the nozzle 1011 directly hits the sensing unit 1031. The flame reflected by the sensing unit 1031, along with the subsequently ejected combustible gas, is blown out of the opening of the ignition cap. If the main gas source has been turned on at this time, the flame ejected from the ignition cap can ignite the combustible gas in the burner 20 connected to the main gas source, thereby turning on the main flame.

[0036] In this embodiment, the sensing part 1031 of the sensing needle 103 is configured as a column and is coaxially arranged with the mounting part. Therefore, it can reflect the flame ejected from the nozzle 1011. Since the flame is reflected by the sensing part 1031, there is no flame separation phenomenon. Therefore, the sensing part 1031 can detect the state of the flame in real time. In addition, since the sensing part 1031 is columnar, the temperature sensing area is larger, so the detection accuracy is higher.

[0037] To further improve the sensitivity of the sensing needle 103, the diameter of the sensing part 1031 in this embodiment is set to match the inner diameter of the nozzle 1011. When the inner diameter of the nozzle 1011 is larger, the diameter of the sensing part 1031 is also larger because the ejected flame is thicker, thus reflecting the flame better and making it less prone to flame lift-off.

[0038] In this embodiment, the ignition head 101, ignition needle 102, and sensing needle 103 are arranged in a triangular (or L-shaped) configuration. The opening of the ignition cap is close to the gap between the ignition needle 102 and the sensing needle 103, allowing the combustible gas ejected from the nozzle 101 to flow through the gap and be ignited before exiting through the opening. Simultaneously, the ignition needle 102 includes an ignition head 1021 extending laterally towards the gap to ignite the combustible gas flowing through it. This structural design allows the ignition needle 102 to exhibit good ignition performance.

[0039] Furthermore, the end of the ignition head 1021 extends to the vicinity of the surface of the sensing needle 103 to form an electric arc with the sensing needle 103, thereby igniting the combustible gas in the gap. In this way, an additional ground wire is unnecessary; the sensing needle 103 can be used as the ground wire. During ignition, an electric arc is formed between the ignition needle 102 and the sensing needle 103, directly igniting the combustible gas in the gap. This not only saves equipment costs but also results in a high ignition rate.

[0040] In addition, the side ignition device 10 of this embodiment also includes a mounting base 105 for mounting the ignition head 101, ignition needle 102, sensing needle 103 and ignition cap. The mounting base is provided with a plurality of through holes (not shown) for mounting the ignition head 101, ignition needle 102 and sensing needle 103 respectively. At the same time, the edge of the mounting base 105 is provided with a plurality of grooves 1051, and the ignition cap is correspondingly provided with a plurality of pins (not shown). The plurality of pins are adapted to be inserted into the grooves 1051 respectively to realize the installation of the ignition cap.

[0041] Example 3

[0042] Reference Figure 8 As shown, this embodiment provides a gas burner head 100, including a side ignition device 10 and a burner 20. The side ignition device 10 is used to generate a constant open flame, and the combustible gas at the burner 20 is ignited through the opening 1041 of the ignition cap 104 to realize the opening of the main flame.

[0043] The gas burner 100 described in this embodiment adopts the side ignition device described in Embodiment 2. The gas burner 100 in this embodiment has high accuracy of flameout protection and high safety in use.

[0044] Example 4

[0045] This embodiment provides a gas stove that uses the gas burner described in Embodiment 3. The gas stove in this embodiment also features high accuracy in flameout protection and high safety during use.

[0046] In summary, this invention addresses the aforementioned deficiencies of existing sensing needles by designing the sensing part of the needle in a cylindrical shape, coaxially aligned with the mounting part and directly opposite the nozzle of the ignition head. This allows the flame generated by the nozzle to directly hit the sensing part, ensuring the sensing needle's contact with the flame and significantly increasing the sensing area. This prevents issues such as unstable gas pressure causing a short sensing needle or excessive gas pressure causing flame detachment, which could lead to inaccurate flame detection, misjudgment by the flameout protection circuit, and accidental shut-off of the main gas, thus affecting the normal operation of the gas stove. This invention effectively improves the accuracy of the gas stove's flameout protection and enhances its safety.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A sensing needle for a gas burner head-side ignition device, generally rod-shaped, comprising a sensing part and a mounting part, wherein the gas burner head-side ignition device has a mounting hole, and the mounting part is adapted to be inserted into the mounting hole, characterized in that: The mounting part includes an insertion section and a positioning section, the diameter of which is larger than that of the mounting hole; the sensing part is columnar and coaxially arranged with the mounting part, one end of which is fixed in the positioning section, and the other end extends along the central axis in a direction away from the mounting part.

2. The sensing needle as described in claim 1, characterized in that: The mounting part has a through hole extending along the axis, and the sensing part is provided with a wire, one end of which is connected to the sensing part, and the other end passes through the through hole and is led out.

3. The sensing needle as described in claim 1 or 2, characterized in that: The mounting part is made of high-temperature resistant ceramic material, and the sensing part is made of metal.

4. A side ignition device for a gas burner, the gas burner having a burner, the side ignition device being disposed beside the burner; the side ignition device comprising an ignition head, an ignition needle, a sensing needle, and an ignition cap; the ignition cap covering the ignition head, ignition needle, and sensing needle and having an opening on the side facing the interior of the burner, wherein combustible gas ejected from the ignition head is ignited by the ignition needle and ejected through the opening to ignite combustible gas inside the burner, characterized in that: The sensing needle is generally rod-shaped and includes a sensing part and a mounting part. The ignition device on the side of the gas burner head has a mounting hole suitable for installing the sensing needle. The mounting part includes an insertion section and a positioning section, and the diameter of the positioning section is larger than that of the mounting hole. The sensing part is columnar and coaxially arranged with the mounting part. One end of the sensing part is fixed inside the mounting part, and the other end extends along the central axis in a direction away from the mounting part. The end of the ignition head has a nozzle, and the nozzle is directly facing the sensing part.

5. The side-ignition device as described in claim 4, characterized in that: The diameter of the sensing element is matched with the inner diameter of the nozzle.

6. The side-ignition device as described in claim 4, characterized in that: The ignition head, ignition needle, and sensing needle are arranged in a triangular pattern. The opening of the ignition cap is close to the gap between the ignition needle and the sensing needle, so that the combustible gas ejected from the nozzle can flow through the gap and be ejected from the opening after being ignited.

7. The side-ignition device as described in claim 6, characterized in that: The ignition needle includes an ignition head that extends laterally toward the gap to ignite combustible gas flowing through the gap.

8. The side-ignition device as described in claim 7, characterized in that: The end of the ignition head extends to the vicinity of the surface of the sensing needle so as to form an electric arc between the ignition head and the sensing needle, thereby igniting the combustible gas in the gap.

9. A gas-fired burner head, characterized in that, The gas burner head has a side ignition device as described in any one of claims 4-8.

10. A gas stove, characterized in that: The gas stove uses the gas burner head described in claim 9.

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