A gas torch capable of maintaining low-temperature flame

Abstract

The present invention discloses a gas torch capable of maintaining a stable flame at a low temperature, comprising a gas bottle, a control valve, a nozzle, a return pipe and a positioning assembly, wherein the air inlet end of the return pipe is connected to the gas bottle through the control valve, and the air outlet end is connected to the nozzle located above the control valve, and the upper end of the return pipe is arranged near the nozzle, and the lower end is spirally wound around the outer wall of the gas bottle. The return pipe of the gas torch adopting this design scheme can be stably and reliably self-positioned on the gas bottle without the aid of other positioning structures, thus saving assembly processes and reducing manufacturing costs; in addition, the spiral loop design of the return pipe can not only increase the close contact between the return pipe and the outer wall of the gas bottle, but also further increase the direct contact area between the return pipe and the gas bottle, which is convenient for rapid and efficient heating of the gas bottle, ensuring that the gas bottle can stably supply gas in a low temperature environment, and meeting the requirements of the gas torch being transmitted in a low temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of torches, and in particular to a low-temperature flame stabilization technology for a gas torch. Background Art

[0002] During the torch relay, various harsh environments will be encountered, such as high altitudes, rainy days, undirected winds, etc. When the local temperature is below zero, the low temperature of the combustion tank will lead to less gasification, affecting the flame combustion or causing incomplete combustion and producing black smoke.

[0003] In order to meet the demand for torches in various sports events and celebrations in low-temperature environments and prevent unstable or inadequate flame combustion due to low ambient temperature, the applicant previously applied for a patent to disclose "CN2019209260680, a gas torch". The lower ends of the first heating tube and the second heating tube are vertically attached to the outer wall of the gas cylinder. However, this single-line loop design requires the use of other positioning structures to achieve the positioning effect, and the manufacturing cost is high. In addition, the lower ends of the first heating tube and the second heating tube have a small direct contact area with the gas cylinder, and the heat transfer efficiency is low, which is not conducive to rapid heating of the gas cylinder. Summary of the invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a gas torch that can stabilize flames at low temperatures. It does not require the aid of other positioning structures, and the lower end of the return pipe can also achieve self-positioning, thereby reducing manufacturing costs. At the same time, it further increases the direct contact area between the return pipe and the gas cylinder, thereby facilitating rapid and efficient heating of the gas cylinder.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A gas torch capable of maintaining a stable flame at a low temperature comprises a gas cylinder, a control valve, a nozzle and a return pipe, wherein the control valve is connected to the gas cylinder for controlling the on and off of the gas, the nozzle is arranged above the gas cylinder, the air inlet end and the air outlet end of the return pipe are respectively connected to the air outlet of the control valve and the nozzle, and the upper end of the return pipe is arranged near the nozzle, and the lower end is spirally wound around the outer wall of the gas cylinder.

[0007] In the first embodiment, the return pipe includes an intake pipe, a first heat transfer pipe and a second heat transfer pipe, the upper end of the first heat transfer pipe is arranged near the nozzle and the intake end thereof is connected with the outlet of the control valve through the intake pipe, the lower end is spirally wound around the outer wall of the gas cylinder and connected with the lower end of the second heat transfer pipe; the upper end of the second heat transfer pipe is connected with the nozzle.

[0008] In a second embodiment, the return pipe includes an intake pipe, a first heat transfer pipe and a second heat transfer pipe, the upper end of the first heat transfer pipe is arranged near the nozzle and the intake end thereof is connected with the outlet of the control valve through the intake pipe, and the lower end is connected with the lower end of the second heat transfer pipe spirally wound around the outer wall of the gas cylinder; the upper end of the second heat transfer pipe is connected with the nozzle.

[0009] In a third embodiment, the return pipe includes an intake pipe, a first heat transfer pipe and a second heat transfer pipe, the upper end of the first heat transfer pipe is arranged near the nozzle and the intake end thereof is connected with the outlet of the control valve through the intake pipe, and the lower end of the first heat transfer pipe and the lower end of the second heat transfer pipe are intertwined and wound around the outer wall of the gas cylinder and are connected with each other; the upper end of the second heat transfer pipe is connected with the nozzle.

[0010] Furthermore, the number of the winding circles is plural.

[0011] Furthermore, all of the winding rings are arranged between the upper end of the outer wall of the gas bottle and the lower half of the outer wall.

[0012] Furthermore, a heat transfer sheet is provided between the outer side wall of the gas cylinder and at least a portion of the winding ring, and / or a heat insulation film covering at least a portion of the winding ring is provided on the outer side wall of the gas cylinder.

[0013] Furthermore, a flame stabilizing structure located above the nozzle is provided at the upper end of the first heat transfer tube.

[0014] Furthermore, the flame stabilizing structure is a flame stabilizing ring.

[0015] Furthermore, the nozzle is in an arc shape arranged around the upper end of the first heat transfer tube, and the nozzle is provided with a plurality of ignition holes facing the flame stabilizing structure at intervals along the bending direction.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. The return pipe of the low-temperature flame-stabilizing gas torch of the present invention can be stably and reliably self-positioned on the gas cylinder without the need for other positioning structures, thus saving assembly procedures and reducing manufacturing costs;

[0018] 2. Compared with the existing single-loop design of the return pipe, the spiral loop design of the return pipe of the present invention can not only increase the close contact between the return pipe and the outer wall of the gas cylinder, but also further increase the direct contact area between the return pipe and the gas cylinder, which is convenient for fast and efficient heating of the gas cylinder, so that the gas cylinder can be stably supplied with gas in a low-temperature environment, meeting the needs of gas torch transmission in a low-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the gas torch in Example 1 of the present invention;

[0020] Figure 2 It is a left side view of the gas torch in Example 1 of the present invention;

[0021] Figure 3 It is a left view of the gas torch in Example 2 of the present invention. DETAILED DESCRIPTION

[0022] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0023] Example 1

[0024] like Figure 1-2 As shown, a gas torch capable of low-temperature flame stabilization in this embodiment includes a gas bottle 1, a control valve 2, a nozzle 3 and a return pipe 4. The control valve 2 is arranged at the gas outlet of the gas bottle 1 to control the on and off of the gas. The nozzle 3 is arranged above the gas bottle 1 or the control valve 2. The gas inlet end and the gas outlet end of the return pipe 4 are respectively connected with the gas outlet of the control valve 2 and the nozzle 3. The upper end of the return pipe 4 is arranged near the nozzle 3, and the lower end is spirally wound around the outer wall of the gas bottle 1. When the gas torch is ignited, the flame burns at the nozzle 3, and the end of the return pipe 4 near the nozzle 3 is heated by the burning flame. The heat is transferred downward to the gas bottle 1 through the return pipe 4, so that the gas bottle 1 is heated, ensuring that the gas bottle 1 can stably supply gas in a low-temperature environment, thereby ensuring that the torch is stably and fully burned in a low-temperature environment, meeting the transmission requirements of the gas torch in a low-temperature environment.

[0025] A gas torch capable of maintaining a stable flame at a low temperature in the present embodiment is constructed by arranging the upper end of the return pipe 4 near the nozzle 3 and spirally winding the lower end of the return pipe 4 around the outer wall of the gas bottle 1, so that the lower end of the return pipe 4 can be stably and reliably self-positioned on the gas bottle 1 without the aid of other positioning structures (such as aluminum foil or fixing clips), thereby saving assembly steps and reducing manufacturing costs. In addition, compared with the existing single-line loop design, the spiral loop design at the lower end of the return pipe 4 in the present embodiment can not only increase the close contact between the lower end of the return pipe 4 and the outer wall of the gas bottle 1, but also further increase the direct contact area between the return pipe 4 and the gas bottle 1, thereby facilitating rapid and efficient heating of the gas bottle 1 through the return pipe 4, thereby enabling the gas bottle 1 to stably supply gas in a low-temperature environment, thereby better meeting the requirements of gas torch transmission in a low-temperature environment.

[0026] Preferably, the return pipe 4 includes an air intake pipe 41, a first heat transfer pipe 42 and a second heat transfer pipe 43. The air intake pipe 41 is arranged above the control valve 2 and its lower end is connected to the air outlet of the control valve 2, and the upper end is located below the nozzle 3; and the lower end of the first heat transfer pipe 42 and the lower end of the second heat transfer pipe 43 are intertwined and wound around the outer wall of the gas cylinder 1 and are connected to each other; the upper end of the second heat transfer pipe 43 is connected to the nozzle 3. Therefore, by interlacing and winding the lower end of the first heat transfer tube 42 and the lower end of the second heat transfer tube 43 around the outer wall of the gas bottle 1, on the one hand, the direct contact area between the lower end of the return tube 4 and the outer wall of the gas bottle 1 can be further increased without the need for a heat transfer sheet disposed between the winding ring and the outer wall of the gas bottle 1, thereby improving the heat transfer effect and the heating effect of the gas bottle 1 through the return tube 4; on the other hand, the gas flows through the upper end of the first heat transfer tube 42 and is heated by the gas flame. When the heated gas flows downward along the first heat transfer tube 42, it first radiates and heats the first heat transfer tube 42 and is wound around the lower end of the gas bottle 1. Then, when the gas flows upward along the second heat transfer tube 43, it radiates and heats the second heat transfer tube 43 and is wound around the lower end of the gas bottle 1. In this way, under the action of the heated gas, the heating efficiency of the gas bottle 1 can be further enhanced.

[0027] In this embodiment, the lower end of the first heat transfer tube 42 and the lower end of the second heat transfer tube 43 are intertwined and wound around the outer wall of the gas cylinder 1 from top to bottom and are connected to each other to ensure that the length of the first heat transfer tube 42 and the second heat transfer tube 43 is the shortest, thereby reducing manufacturing costs.

[0028] Preferably, the number of winding circles is plural. More preferably, all winding circles are arranged between the upper end of the outer wall of the gas bottle 1 and the lower half of the outer wall, so that it can effectively ensure that there is a sufficiently large contact area between the lower end of the first heat transfer tube 42 and the gas bottle 1, and between the lower end of the second heat transfer tube 43 and the gas bottle 1.

[0029] In other embodiments, a heat transfer sheet (not shown in the figure) is provided between the outer wall of the gas cylinder 1 and at least part of the winding circle to improve the heat transfer efficiency between the winding circle and the gas cylinder 1; and / or a heat insulation film (not shown in the figure) is provided on the outer wall of the gas cylinder 1 to cover at least part of the winding circle, and the heat insulation film is aluminum foil to reduce heat loss from the winding circle.

[0030] like Figure 1As shown, further, a flame stabilizing structure 421 located above the nozzle 3 is provided at the upper end of the first heat transfer tube 42. The flame stabilizing structure 421 is a flame stabilizing ring formed by winding the upper end of the first heat transfer tube 42. The number of rings of the flame stabilizing ring is at least one. Thus, by providing the flame stabilizing structure 421 above the nozzle 3, on the one hand, the stability of the combustion flame can be improved, so that the flame is not easy to extinguish. On the other hand, it is beneficial to increase the contact area between the upper end of the first heat transfer tube 42 and the combustion flame, improve the heating effect of the upper end of the first heat transfer tube 42 by the combustion flame, and further improve the heating efficiency of the gas bottle 1, so that the gas bottle 1 can quickly and stably supply gas, meeting the transmission requirements of the gas torch in a low temperature environment. Preferably, the number of rings of the flame stabilizing ring in this embodiment is two, so as to further enhance the flame stabilizing effect and the heating efficiency of the upper end of the first heat transfer tube 42.

[0031] Furthermore, the nozzle 3 is in an arc shape arranged around the upper end of the first heat transfer tube 42, and the nozzle 3 is provided with a plurality of fire outlet holes facing the flame stabilizing structure 421 at intervals along the bending direction. This can increase the combustion area, which is beneficial to improving the stability of the torch combustion. At the same time, the torch combustion flame can be fully utilized to heat the flame stabilizing ring, thereby improving the heating effect of the first heat transfer tube 42, thereby improving the heating effect of the gas cylinder 1.

[0032] Combine the following Figure 1 To illustrate the working principle of the gas torch of this embodiment:

[0033] like Figure 1 As shown, at the beginning of the operation of the gas torch, the gas in the gas bottle 1 is released through the control valve 2, and then enters the gas inlet end of the first heat transfer tube 42 through the air inlet pipe 41, and is first transported upward along the first heat transfer tube 42 to the flame stabilizing structure 421, and then is transported downward along the first heat transfer tube 42 to the gas bottle 1 and flows downward in a spiral along the outer wall of the gas bottle 1; then the gas enters the second heat transfer tube 43, and is first transported upward in a spiral along the outer wall of the gas bottle 1, and then is transported vertically upward to the nozzle 3 and is ignited at the ignition hole of the nozzle 3.

[0034] During the combustion process of the gas torch, the flame-stabilizing structure 421 is continuously heated by the flame, and the heat is transferred downward through the first heat transfer tube 42 to heat the gas bottle 1, and the contact area between the lower end of the first heat transfer tube 42 and the lower end of the second heat transfer tube 43 and the gas bottle 1 is increased through the winding ring, so that the gas bottle 1 is quickly and efficiently heated, ensuring that the gas bottle 1 can stably supply gas in a low-temperature environment. In addition, during the transportation of the gas, the gas will be heated when passing through the flame-stabilizing structure 421 heated by the flame. The heated gas first flows through the winding ring and radiates and heats the winding ring, which is conducive to further enhancing the heat transfer efficiency between the winding ring and the gas bottle 1, ensuring that the gas bottle 1 is quickly heated and continuously and stably discharges gas, and then transported to the nozzle 3 and efficiently burns at the ignition hole, improving the combustion stability and sufficiency.

[0035] Example 2

[0036] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that the spiral winding method of the return pipe 4 is different from that of the return pipe 4. Specifically, the lower end of the second heat transfer pipe 43 vertically extends downward to the lower half of the outer wall of the gas bottle 1, and the lower end of the first heat transfer pipe 42 spirally winds along the outer wall of the gas bottle 1 from top to bottom and communicates with the lower end of the second heat transfer pipe 43. Other parts are the same as those of embodiment 1.

[0037] It can be seen that by spirally winding the lower end of the first heat transfer tube 42 or the lower end of the second heat transfer tube 43 around the outer wall of the gas cylinder 1, not only the winding process of the return tube 4 can be simplified, but also the close contact between the lowest point of the winding circle and the outer wall of the gas cylinder 1 can be enhanced, thereby improving the heat transfer effect between the winding circle and the gas cylinder 1.

[0038] In other embodiments, the arrangement of the lower end of the second heat transfer tube 43 and the lower end of the first heat transfer tube 42 can be swapped, that is, the lower end of the first heat transfer tube 42 extends vertically downward to the lower half of the outer wall of the gas cylinder 1, and the lower end of the second heat transfer tube 43 is spirally wound around the outer wall of the gas cylinder 1 from top to bottom and connected to the lower end of the first heat transfer tube 42.

[0039] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A gas torch capable of low temperature flame stabilization, characterized in that: The invention comprises a gas cylinder (1), a control valve (2), a nozzle (3) and a return pipe (4), wherein the control valve (2) is connected to the gas cylinder (1) for controlling the on and off of the gas, the nozzle (3) is arranged above the gas cylinder (1), the gas inlet end and the gas outlet end of the return pipe (4) are respectively connected to the gas outlet of the control valve (2) and the nozzle (3), and the upper end of the return pipe (4) is arranged near the nozzle (3), and the lower end is spirally wound around the outer wall of the gas cylinder (1); The return pipe (4) comprises an air intake pipe (41), a first heat transfer pipe (42) and a second heat transfer pipe (43); the air intake pipe (41) is arranged above the control valve (2) and its upper end is located below the nozzle (3); the upper end of the first heat transfer pipe (42) is arranged near the nozzle (3) and its air intake end is connected to the air outlet of the control valve (2) through the air intake pipe (41); the upper end of the second heat transfer pipe (43) is connected to the nozzle (3); The lower end of the first heat transfer tube (42) is spirally wound around the outer wall of the gas bottle (1) and is connected to the lower end of the second heat transfer tube (43), or The lower end of the first heat transfer tube (42) is connected to the lower end of the second heat transfer tube (43) spirally wound around the outer wall of the gas bottle (1), or The lower end of the first heat transfer tube (42) and the lower end of the second heat transfer tube (43) are interlaced and wound around the outer wall of the gas bottle (1) and are connected to each other.

2. A gas torch capable of low temperature flame stabilization according to claim 1, characterized in that: The number of winding circles in which the lower end of the return pipe (4) is spirally wound around the outer wall of the gas cylinder (1) is plural.

3. A gas torch capable of low temperature flame stabilization according to claim 2, characterized in that: All of the winding rings are arranged between the upper end of the outer wall of the gas bottle (1) and the lower half of the outer wall.

4. A gas torch capable of low temperature flame stabilization according to claim 2 or 3, characterized in that: A heat transfer sheet is provided between the outer wall of the gas bottle (1) and at least part of the winding ring, and / or a heat insulation film covering at least part of the winding ring is provided on the outer wall of the gas bottle (1).

5. A gas torch capable of low temperature flame stabilization according to any one of claims 1 to 3, characterized in that: The upper end of the first heat transfer tube (42) is provided with a flame stabilizing structure (421) located above the nozzle (3).

6. A gas torch capable of low temperature flame stabilization according to claim 5, characterized in that: The flame stabilizing structure (421) is a flame stabilizing ring.

7. A gas torch capable of low temperature flame stabilization according to claim 6, characterized in that: The flame stabilizing ring is formed by winding the upper end of the first heat transfer tube (42), and the number of the flame stabilizing ring is at least one.

8. A gas torch capable of low temperature flame stabilization according to claim 5, characterized in that: The nozzle (3) is in the shape of an arc arranged around the upper end of the first heat transfer tube (42), and the nozzle (3) is provided with a plurality of fire outlet holes facing the flame stabilizing structure (421) at intervals along the bending direction.

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