HANDHELD BURNING DEVICE

Abstract

A handheld burning device includes a diversion mechanism, a nozzle connected to the diversion mechanism, a mixing inner tube arranged adjacent to an outlet of the nozzle, an ignition mechanism, and a metal outer tube that is sleeved around the mixing inner tube. The outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm, an inner diameter of the mixing inner tube is within a range from 28 times to 33 times of the aperture, a length of the mixing inner tube is within a range from 60 mm to 100 mm, and a length of the metal outer tube is greater than the length of the mixing inner tube and is within a range from 90 mm to 140 mm.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims the benefit of priority to Taiwan Patent Application No. 112210248, filed on Sep. 22, 2023. The entire content of the above identified application is incorporated herein by reference.

Some references, which may include patents, patent applications and various publications, may be cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to a burning device, and more particularly to a handheld burning device.

BACKGROUND OF THE DISCLOSURE

A conventional handheld burning device (e.g., a handheld torch) is usually held by a user for heating an object over a period of time. For example, the conventional handheld burning device is used to heat charcoals for a barbecue. However, the conventional handheld burning device cannot be provided with a longer metal outer tube (e.g., a length of a conventional metal outer tube usually being less than 60 mm) due to limitations in structural design thereof, such that the handheld burning device is prone to safety concerns (e.g., burning of the user's hand) or induces fear (e.g., when the user's hand gets too close to the heated object).

SUMMARY OF THE DISCLOSURE

In response to the above-referenced technical inadequacies, the present disclosure provides a handheld burning device for effectively improving on the issues associated with conventional handheld burning devices.

In order to solve the above-mentioned problems, one of the technical aspects adopted by the present disclosure is to provide a handheld burning device, which includes a diversion mechanism, a nozzle, a mixing inner tube, an ignition mechanism, and a metal outer tube. The diversion mechanism has a flow channel therein. The diversion mechanism is configured to be detachably connected to a fuel tank for allowing one end of the flow channel to be in spatial communication with the fuel tank. The nozzle is connected to the diversion mechanism and is in spatial communication with another end of the flow channel. An outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm. The mixing inner tube has two ends that are respectively defined as a first end and a second end. The first end is arranged adjacent to the outlet of the nozzle. An inner diameter of the mixing inner tube is within a range from 28 times to 33 times of the aperture, and a length of the mixing inner tube is within a range from 60 mm to 100 mm. The ignition mechanism has an ignition end and a manipulation end. The ignition end is arranged adjacent to the second end of the mixing inner tube, and the manipulation end is arranged away from the second end of the mixing inner tube. The metal outer tube is sleeved around the mixing inner tube. The second end of the mixing inner tube is arranged in the metal tube. A length of the metal outer tube is greater than the length of the mixing inner tube and is within a range from 90 mm to 140 mm.

Therefore, the components of the handheld burning device in the present disclosure are provided with a specific structural connection relationship (e.g., the aperture of the nozzle being within a range from 0.17 mm to 0.19 mm, and the inner diameter of the mixing inner tube being within a range from 28 times to 33 times of the aperture), so that the mixing inner tube can be designed to be longer for enabling the length of the mixing inner tube to be within a range from 60 mm to 100 mm under a premise that the operation of the handheld burning device is not affected.

These and other aspects of the present disclosure will become apparent from the following description of the embodiment taken in conjunction with the following drawings and their captions, although variations and modifications therein may be affected without departing from the spirit and scope of the novel concepts of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The described embodiments may be better understood by reference to the following description and the accompanying drawings, in which:

FIG. 1 is a schematic perspective view of a handheld burning device according to a first embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of the handheld burning device from another angle of view;

FIG. 3 is a schematic view showing the handheld burning device in practice;

FIG. 4 is a schematic exploded view of FIG. 1;

FIG. 5 is a schematic exploded view of FIG. 2;

FIG. 6 is a schematic cross-sectional view taken along line VI-VI of FIG. 1;

FIG. 7 is a schematic enlarged view of part VII of FIG. 6;

FIG. 8 is a schematic enlarged view of part VIII of FIG. 6;

FIG. 9 is a schematic front view of FIG. 1; and

FIG. 10 a schematic perspective view of the handheld burning device according to a second embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The present disclosure is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Like numbers in the drawings indicate like components throughout the views. As used in the description herein and throughout the claims that follow, unless the context clearly dictates otherwise, the meaning of “a,” “an” and “the” includes plural reference, and the meaning of “in” includes “in” and “on.” Titles or subtitles can be used herein for the convenience of a reader, which shall have no influence on the scope of the present disclosure.

The terms used herein generally have their ordinary meanings in the art. In the case of conflict, the present document, including any definitions given herein, will prevail. The same thing can be expressed in more than one way. Alternative language and synonyms can be used for any term(s) discussed herein, and no special significance is to be placed upon whether a term is elaborated or discussed herein. A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms is illustrative only, and in no way limits the scope and meaning of the present disclosure or of any exemplified term. Likewise, the present disclosure is not limited to various embodiments given herein. Numbering terms such as “first,” “second” or “third” can be used to describe various components, signals or the like, which are for distinguishing one component/signal from another one only, and are not intended to, nor should be construed to impose any substantive limitations on the components, signals or the like.

First Embodiment

Referring to FIG. 1 to FIG. 9, a first embodiment of the present disclosure is provided. As shown in FIG. 1 to FIG. 3, the present embodiment provides a handheld burning device 100 (or a handheld torch 100) for being detachably connected to a fuel tank 200 (e.g., a gas tank). The handheld burning device 100 can be used to divert and burn fuel in the fuel tank 200 for heating a target object 300 (e.g., charcoals).

As shown in FIG. 4 to FIG. 6, the handheld burning device 100 in the present embodiment includes a diversion mechanism 1, a nozzle 2 connected to the diversion mechanism 1, a housing 3 covering the diversion mechanism 1 and the nozzle 2, a mixing inner tube 4 arranged adjacent to the nozzle 2, an ignition mechanism 5 corresponding in position to the mixing inner tube 4, a ceramic tube 6 assembled to the mixing inner tube 4, a metal outer tube 7 (e.g., a stainless steel outer tube) sleeved around (or at) the mixing inner tube 4, and a regulating valve 8 that is assembled to the diversion mechanism 1, but the present disclosure is not limited thereto. For example, in other embodiments of the present disclosure not shown in the drawings, at least one of the regulating valve 8, the housing 3, and the ceramic tube 6 can be omitted or replaced by other components according to design requirements. The following description describes the structure and connection relationship of each component of the handheld burning device 100.

The diversion mechanism 1 is configured to be detachably connected to the fuel tank 200 for allowing a flow channel P formed in the diversion mechanism 1 to be in spatial communication with the fuel tank 200 through one end thereof. The diversion mechanism 1 can be adjusted or changed according to design requirements. In order to clearly explain an operation of the diversion mechanism 1 of the present embodiment, the following description describes one of possible configurations of the diversion mechanism 1, but the present disclosure is not limited thereto.

Specifically, the diversion mechanism 1 includes a metal frame 11, a copper valve 12 assembled to the metal frame 11, and a diversion pipe 13 that is connected to the metal frame 11. The metal frame 11 carries (i.e., physically supports) the nozzle 2, the housing 3, the mixing inner tube 4, the ignition mechanism 5, the metal outer tube 7, and the regulating valve 8.

The metal frame 11 of the present embodiment includes a guiding portion 111, a mixing chamber 112, and a plurality of brackets 113 that connect the guiding portion 111 and the mixing chamber 112. A part of the flow channel P is formed in an interior space of the guiding portion 111, the mixing chamber 112 and the guiding portion 111 are spaced apart from each other through the brackets 113, and the mixing chamber 112 has a plurality of openings 1121.

Moreover, the copper valve 12 in the present embodiment is fixed to the metal frame 11 (e.g., the guiding portion 111) in a riveted manner, and a height H12 of the copper valve 12 is within a range from 20 mm to 25 mm. The diversion mechanism 1 is configured to be detachably threaded to the fuel tank 200 through the copper valve 12 for allowing the guiding portion 111 to be in spatial communication with the fuel tank 200.

One end of the diversion pipe 13 is connected to (the guiding portion 111 of) the metal frame 11 to (enable the diversion pipe 13 and the guiding portion 11 to) jointly define the flow channel P. Another end of the diversion pip 13 is connected to the nozzle 2 (e.g., another end of the flow channel P being in spatial communication with the nozzle 2). The nozzle 2 is assembled to the metal frame 11, and a part of the nozzle 2 is arranged in the mixing chamber 112. An outlet 21 of the nozzle 2 is arranged in the mixing chamber 112 and has an aperture D21 (as shown in FIG. 7) being within a range from 0.17 mm to 0.19 mm.

Since a structural design of the diversion pipe 13 is associated with the other components of the handheld burning device 100, a specific structure of the diversion pipe 13 would be described in a suitable paragraph of the following description for clearly describing the connection relationship among the diversion pipe 13 and the other components of the handheld burning device 100.

The housing 3 is formed by two half-housings 31 fixed to the metal frame 1 (e.g., at least one of the brackets 113), so that the housing 3 covers the diversion mechanism 1 and the nozzle 2 (i.e., the diversion mechanism 1 and the nozzle 2 are located inside of the housing 3). Moreover, the housing 3 has a plurality of thru-holes 32 substantially located at two opposite sides of the openings 1121 of the mixing chamber 112, respectively, so that an interior space of the mixing chamber 112 can be in spatial communication with an external space through the openings 1121 and the thru-holes 32.

As shown in FIG. 4 and FIG. 6 to FIG. 8, the mixing inner tube 4 has a substantially round tubular shape, and the mixing inner tube 4 has two ends that are respectively defined as a first end 411 and a second end 421. It should be noted that an inner diameter D41, D42 of the mixing inner tube 41 is within a range from 28 times to 33 times of the aperture D21 so as to allow the mixing inner tube 4 to be formed with a length L4 that is within a range from 60 mm to 100 mm (e.g., the length L4 being preferably 80 mm to 90 mm). Specifically, since the handheld burning device 100 needs to meet strict safety regulations, the length L4 of the mixing inner tube 4 would be designed under many factors that need to be considered (e.g., how to ensure that the fuel in the mixing inner tube 4 has an uninterrupted and stable flow), making it difficult for the length L4 of the mixing inner tube 4 to become longer.

Accordingly, the components of the handheld burning device 100 in the present embodiment are provided with a specific structural connection relationship (e.g., the aperture D21 being within a range from 0.17 mm to 0.19 mm, and the inner diameter D41, D42 of the mixing inner tube 41 being within a range from 28 times to 33 times of the aperture D21), so that the mixing inner tube 4 can be designed to be longer for enabling the length L4 to be within a range from 60 mm to 100 mm under a premise that the operation of the handheld burning device 100 is not affected.

In addition, in order to ensure that the operation of the handheld burning device 100 is not affected by the length L4 of the mixing inner tube 4 provided by the present embodiment, the handheld burning device 100 is preferably provided with at least part of the following features, but the present disclosure is not limited thereto.

The first end 411 of the mixing inner tube 4 is arranged adjacent to the outlet 21 of the nozzle 2 and is arranged in the mixing chamber 112. In the present embodiment, the mixing inner tube 4 includes a transmission tube body 41 and an ignition head 42 that is assembled to the transmission tube body 41. The first end 411 is arranged on the transmission tube body 41, and the second end 421 is arranged on the ignition head 42. Specifically, the transmission tube body 41 and the ignition head 42 can be made of different materials, a length of the transmission tube body 41 is at least three times of a length of the ignition head 42, and an inner diameter D42 of the ignition head 42 is within a range from 80% to 95% of an inner diameter D41 of the transmission tube body 41.

In the present embodiment, the ignition head 42 has a main flame channel 422 and a plurality of pilot flame channels 423 that surround the main flame channel 422 (e.g., the pilot flame channels 423 being in an annular arrangement surrounding the main flame channel 422). The main flame channel 422 is arranged along an axial direction of the transmission tube body 41 and is in spatial communication with the transmission tube body 41. The pilot flame channels 423 are respectively arranged along radial directions of the transmission tube body 41 and are in spatial communication with the transmission tube body 41. One end of each of the pilot flame channels 423 is arranged adjacent to a position between the transmission tube body 41 and the main flame channel 422, and another end of each of the pilot flame channels 423 is arranged on the second end 421 and outside of the main flame channel 422.

The ignition mechanism 5 has an ignition end 51, a manipulation end 52, and a wire 53 that connects the ignition end 51 and the manipulation end 52. The ignition end 51 is arranged adjacent to the second end 421 of the mixing inner tube 4 (e.g., the ignition end 51 of the ignition mechanism 5 is arranged adjacent to an extension path of at least one of the pilot flame channels 423). The manipulation end 52 is arranged away from the second end 421 of the mixing inner tube 4 (e.g., the manipulation end 52 is a trigger that is assembled to one of the brackets 113 of the metal frame 11 and that is substantially located under the mixing chamber 112). The wire 53 extends from the manipulation end 52 to the ignition end 51 by passing through the mixing chamber 112 and being arranged along the mixing inner tube 4.

The ceramic tube 6 has an inner channel 61, a first channel 62 arranged at one side of the inner channel 61, and a second channel 63 that is arranged at another side of the inner channel 61. The ceramic tube 6 is sleeved around (or at) the ignition head 42 through the inner channel 61 (i.e., the ignition head 42 is inserted into the inner channel 61 of the ceramic tube 6), so that the ignition head 42 and the metal outer tube 7 are separated from each other through the ceramic tube 6. In other words, the second end 421 of the mixing inner tube 4 does not protrude from the ceramic tube 6.

Moreover, at least part of the first channel 62 is in spatial communication with the inner channel 61, so that the wire 53 is inserted into the first channel 62 and the ignition end 51 is arranged in the first channel 62. At least part of the second channel 63 is in spatial communication with the inner channel 61, so that a part of the flow channel P (defined by the diversion pipe 13) is arranged in the second channel 61.

Specifically, a length of the diversion pipe 13 in the present embodiment is at least two times of the length L4 of the mixing inner tube 4. The diversion pipe 13 includes a first flow segment 131, a second flow segment 132 arranged adjacent to the first flow segment 131, and a turning gasification segment 133 that connects the first flow segment 131 and the second flow segment 132.

The first flow segment 131 extends from the metal frame 11 toward the second end 421 of the mixing inner tube 4 by passing through the mixing chamber 112. The second flow segment 132 extends from the nozzle 2 toward the second end 421 of the mixing inner tube 4 by passing through the mixing chamber 112. The first flow segment 131 and the second flow segment 132 are connected to the turning gasification segment 133 so as to be in spatial communication with each other through the turning gasification segment 133.

Moreover, the turning gasification segment 133 protrudes from the mixing inner tube 4 and is arranged adjacent to the ignition end 51 of the ignition mechanism 5. The turning gasification segment 133, a part of the first flow segment 131, and a part of the second flow segment 132, the latter two of which are arranged adjacent to the turning gasification segment 133, are located in the second channel 63 of the ceramic tube 6. The turning gasification segment 133 and the ignition end 51 substantially face toward each other. In the present embodiment, the turning gasification segment 133 has a substantially arced shape, and a central angle σ133 (as shown in FIG. 9) of the turning gasification segment 133 with respect to a central axis of the metal outer tube 7 is within a range from 15 degrees to 90 degrees, but the present disclosure is not limited thereto.

The metal outer tube 7 is fixed to the metal frame 11 (e.g., the mixing chamber 112), and a length L7 of the metal outer tube 7 is greater than the length L4 of the mixing inner tube 4 and is within a range from 90 mm to 140 mm. In the present embodiment, the metal outer tube 7 is sleeved around (or at) a part of the mixing chamber 112, the mixing inner tube 4, the ceramic 6, the ignition end 51, a part of the wire 53, and the diversion pipe 13 (i.e., the part of the mixing chamber 112, the mixing inner tube 4, the ceramic 6, the ignition end 51, the part of the wire 53, and the diversion pipe 13 are inserted into the metal outer tube 7), such that the second end 421 of the mixing inner tube 4, the ceramic tube 6, and the turning gasification segment 133 are arranged in the metal outer tube 7.

In summary, the handheld burning device 100 of the present embodiment can be used to light a pilot flame by using the ignition end 51 to generate a spark to the fuel that has a lower flow rate and that flows along the pilot flame channels 423, such that the pilot flame burns the fuel flowing along the main flame channel 422 for completing an ignition process of the handheld burning device 100.

Moreover, when the handheld burning device 100 is in a burning operation, since the turning gasification segment 133 is arranged adjacent to the pilot flame channels 423, the turning gasification segment 133 and the fuel that flows in an interior space thereof are heated by the pilot flame having a lower temperature, thereby preventing the interior space of the turning gasification segment 133 from generating carbonized substance which would clog the interior space of the turning gasification segment 133.

In addition, the ceramic tube 6 of the handheld burning device 100 in the present embodiment can be provided to isolate the heat energy of the burning operation from the metal outer tube 7, thereby preventing the metal outer tube 7 from becoming red in color due to overheating. Accordingly, the safety concerns of the handheld burning device 100 can be further improved and the fear of use induced by the handheld burning device 100 can be alleviated.

It should be noted that the regulating valve 8 can be assembled to the guiding portion 111 of the metal frame 11, so that the user can adjust the regulating valve 8 to control the flow rate of the fuel that flows from the flowing portion 111 to the diversion pipe 13, thereby controlling the intensity of the flame generated by the handheld burning device 100.

In addition, the handheld burning device 100 can further include two retaining gaskets 9 each having a substantial annular shape and a compression spring 10 according to design requirements. The two retaining gaskets 9 are sleeved around (or at) two opposite ends of the transmission tube body 41 (e.g., the two retaining gaskets 9 are respectively arranged adjacent to the first end 411 and the second end 421; or, the two opposite ends of the transmission tube body 41 are respectively inserted into the two retaining gaskets 9) and abut against an inner wall of the metal outer tube 7. The compression spring 10 is sandwiched between the ceramic tube 6 and an adjacent one of the two retaining gaskets 9, so that the ceramic tube 6 can be maintained to abut against an end edge 71 of the metal outer tube 7 having a slightly concave shape (or being slightly tapered) through the elasticity of the compression spring 10.

Second Embodiment

Referring to FIG. 10, a second embodiment of the present disclosure, which is similar to the first embodiment of the present disclosure, is provided. For the sake of brevity, descriptions of the same components in the first and second embodiments of the present disclosure will be omitted herein, and the following description only discloses different features between the first and second embodiments.

In the present embodiment, the copper valve 12 is fixed to the metal frame 11 (e.g., the guiding portion 111) through structural engagement, so that a height of the copper valve 12 can be reduced to be within a range from 10 mm to 15 mm, thereby effectively reducing the manufacturing cost of the copper valve 12 and meeting diverse requirements. The diversion mechanism 1 is configured to be detachably threaded to the fuel tank (not shown in the FIG. 10) through the copper valve 12 for allowing the guiding portion 111 to be in spatial communication with the fuel tank.

Beneficial Effects of the Embodiments

In conclusion, the components of the handheld burning device in the present disclosure are provided with a specific structural connection relationship (e.g., the aperture of the nozzle being within a range from 0.17 mm to 0.19 mm, and the inner diameter of the mixing inner tube being within a range from 28 times to 33 times of the aperture), so that the mixing inner tube can be designed to be longer for enabling the length of the mixing inner tube to be within a range from 60 mm to 100 mm under a premise that the operation of the handheld burning device is not affected. Accordingly, the safety concerns of the handheld burning device can be improved and the fear of using generated by the handheld burning device can be reduced.

The foregoing description of the exemplary embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching.

The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope.

Claims

1. A handheld burning device, comprising: a diversion mechanism having a flow channel therein, wherein the diversion mechanism is configured to be detachably connected to a fuel tank for allowing one end of the flow channel to be in spatial communication with the fuel tank;a nozzle connected to the diversion mechanism and being in spatial communication with another end of the flow channel, wherein an outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm;a mixing inner tube having two ends that are respectively defined as a first end and a second end, wherein the first end is arranged adjacent to the outlet of the nozzle, and wherein an inner diameter of the mixing inner tube is within a range from 28 times to 33 times of the aperture, and a length of the mixing inner tube is within a range from 60 mm to 100 mm;an ignition mechanism having an ignition end and a manipulation end, wherein the ignition end is arranged adjacent to the second end of the mixing inner tube, and the manipulation end is arranged away from the second end of the mixing inner tube; anda metal outer tube sleeved around the mixing inner tube, wherein the second end of the mixing inner tube is arranged in the metal tube, and wherein a length of the metal outer tube is greater than the length of the mixing inner tube and is within a range from 90 mm to 140 mm.

2. The handheld burning device according to claim 1, wherein the diversion mechanism includes: a metal frame carrying the nozzle, the mixing inner tube, the ignition mechanism, and the metal outer tube;a copper valve assembled to the metal frame and being configured to be threadedly connected to the fuel tank; anda diversion pipe, wherein one end of the diversion pipe is connected to the metal frame to jointly define the flow channel, another end of the diversion pip is connected to the nozzle, and a length of the diversion pipe is at least two times of the length of the mixing inner tube.

3. The handheld burning device according to claim 2, wherein the copper valve is fixed to the metal frame in a riveted manner, and a height of the copper valve is within a range from 20 mm to 25 mm.

4. The handheld burning device according to claim 2, wherein the copper valve is fixed to the metal frame through structural engagement, and a height of the copper valve is within a range from 10 mm to 15 mm.

5. The handheld burning device according to claim 2, wherein the diversion pipe includes: a first flow segment extending from the metal frame toward the second end of the mixing inner tube;a second flow segment extending from the nozzle toward the second end of the mixing inner tube, wherein the first flow segment is arranged adjacent to the first flow segment; anda turning gasification segment arranged adjacent to the ignition end of the ignition mechanism, wherein the first flow segment and the second flow segment are connected to the turning gasification segment so as to be in spatial communication with each other.

6. The handheld burning device according to claim 5, wherein the turning gasification segment protrudes from the mixing inner tube and is arranged in the metal outer tube, and a central angle of the turning gasification segment with respect to a central axis of the metal outer tube is within a range from 15 degrees to 90 degrees.

7. The handheld burning device according to claim 2, further comprising a housing that covers the diversion mechanism and the nozzle and that has a plurality of thru-holes, wherein the metal frame has a mixing chamber accommodating a part of the nozzle and the first end of the mixing inner tube, and wherein the mixing chamber has a plurality of openings, and an interior space of the mixing chamber is in spatial communication with an external space through the openings and the thru-holes.

8. The handheld burning device according to claim 1, wherein the mixing inner tube includes: a transmission tube body, wherein the first end of the mixing inner tube is arranged on the transmission tube body; andan ignition head assembled to the transmission tube body, wherein the second end of the mixing inner tube is arranged on the ignition head, and an inner diameter of the ignition head is within a range from 80% to 95% of an inner diameter of the transmission tube body.

9. The handheld burning device according to claim 8, wherein the ignition head has: a main flame channel arranged along an axial direction of the transmission tube body, wherein the main flame channel and the transmission tube body are in spatial communication with each other; anda plurality of pilot flame channels surrounding the main flame channel and respectively arranged along radial directions of the transmission tube body, wherein the pilot flame channels and the transmission tube body are in spatial communication with each other;wherein the ignition end of the ignition mechanism is arranged adjacent to an extension path of at least one of the pilot flame channels.

10. The handheld burning device according to claim 8, further comprising a ceramic tube having: an inner channel sleeved around the ignition head, wherein the ignition head and the metal outer tube are separated from each other through the ceramic tube;a first channel, wherein at least part of the first channel is in spatial communication with the inner channel, and the ignition end is arranged in the first channel; anda second channel, wherein at least part of the second channel is in spatial communication with the inner channel, and a part of the flow channel is arranged in the second channel.