A mosquito killing device

Abstract

This utility model provides a mosquito-killing device, belonging to the technical field of mosquito-killing devices, comprising: a flame gun having a jet pipe and a switch, the switch having a jet setting for spraying gaseous fuel from the jet pipe and an ignition setting for igniting the sprayed gaseous fuel; an extension tube forming an air guide channel inside, one end of the air guide channel communicating with the jet pipe, and the other end forming a flame outlet; a flow restrictor disposed within the air guide channel of the extension tube, the flow restrictor having an inner diameter smaller than the air guide channel; in this utility model, by setting a flow restrictor inside the extension tube, the flow restrictor divides the extension tube into a first section and a second section, when the switch is in the jet setting, fuel is filled into the first section, and when the switch is in the ignition setting, the fuel in the first section is ignited, causing the fuel to explode and the flame to be sprayed out from the flame outlet, killing mosquitoes, and after the explosion, the switch is released, and the switch automatically returns to the off position.

Description

Technical Field

[0001] This utility model relates to the technical field of mosquito killing devices, specifically to a mosquito killing device. Background Technology

[0002] Electric mosquito swatters, as a convenient mosquito-killing tool, have become an essential item for many households. They utilize battery-powered electricity to release an electric shock through a high-voltage grid, killing mosquitoes. However, electric mosquito swatters have many limitations in use; for example, they cannot reach mosquitoes in corners.

[0003] Chinese patent document CN201319813Y discloses a mosquito trap that uses a butane-carbon dioxide generator as a gas source, comprising: a butane gas tank, a generator, and a mosquito trap. Butane is burned in a mixing chamber to produce carbon dioxide, which attracts mosquitoes into the mosquito trap, where the trap captures them.

[0004] However, the above method is a passive mosquito trapping method, which cannot capture a single mosquito in a specific location and is not suitable for home use. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of existing mosquito-killing devices that cannot effectively eliminate a single mosquito in a specific location, thereby providing a mosquito-killing device.

[0006] To solve the above-mentioned technical problems, this utility model provides a mosquito killing device, including: a flame gun, having a jet pipe and a switch, the switch having a jet setting for spraying gaseous fuel from the jet pipe and an ignition setting for igniting the sprayed gaseous fuel. An extension tube is provided, the interior of which forms an air guide channel. One end of the air guide channel is connected to the jet pipe, and the other end forms a flame outlet. A flow restrictor is disposed within the air guide channel of the extension tube. The flow restrictor has an inner diameter smaller than that of the air guide channel. The flow restrictor divides the air guide channel into a first section closer to the flame gun and a second section farther from the flame gun, and the first section and the second section are connected through the air guide channel. In use, first, switch the switch to the jet position to fill the first section of the extension tube with gaseous fuel. After a short time, the gaseous fuel in the first section of the extension tube reaches an explosive concentration. Then, switch the switch to the ignition position to ignite the gaseous fuel in the first section of the extension tube. The resulting flame passes through the flow restrictor and enters the second section of the extension tube. Finally, the flame generated by burning the gaseous fuel in the first section of the extension tube is ejected from the flame outlet in one go.

[0007] Preferably, at least a portion of the jet pipe extends into one end of the air guide channel of the extension pipe, a first gap exists between the outer wall of the jet pipe and the inner wall of the air guide channel of the extension pipe, a first air inlet is provided on the outer wall of the extension pipe, the first air inlet is opposite to the outer wall of the jet pipe, and the first air inlet communicates with the air guide channel through the first gap.

[0008] Preferably, the outer wall of the jet pipe has a side inlet, which communicates with the interior of the jet pipe. The side inlet is offset from the first air inlet in the axial direction, and the side inlet is closer to the flame outlet than the first air inlet.

[0009] Preferably, a connecting pipe is provided between the jet pipe and the extension pipe at one end near the flame outlet, and the connecting pipe is sealed at the end of the first gap.

[0010] Preferably, there is a second gap between the outer wall of the flow restrictor and the inner wall of the air guide channel of the extension tube, and a second air inlet is provided on the outer wall of the extension tube. The second air inlet is opposite to the outer wall of the flow restrictor and is connected to the air guide channel through the second gap.

[0011] Preferably, the flow restrictor has a tapered outer diameter at least in the section near the flame outlet, forming the second gap between the tapered structure and the inner wall of the extension tube.

[0012] Preferably, the outlet of the jet pipe is provided with a speed reduction structure.

[0013] Preferably, the outlet of the jet pipe is connected to an inclined nozzle, which has an outlet inclined toward the inner wall of the extension pipe, and the inclined nozzle is used to make the gas ejected from the jet pipe be ejected at an inclined angle toward the inner wall of the extension pipe.

[0014] Preferably, the extension tube is provided with a flared part at one end of the flame outlet, and the diameter of the flared part gradually increases from the flame outlet outward.

[0015] Preferably, the extension tube has a color-changing coating on its inner wall at least at the flame outlet, which is used to burn the flame as it passes by, thereby giving the flame a color.

[0016] The technical solution of this utility model has the following advantages: 1. The mosquito-killing device provided by this utility model divides the extension tube into a first section and a second section by setting a flow limiting component inside the extension tube. When the switch is in the jet position, fuel is filled into the first section. When the switch is in the ignition position, the fuel in the first section is ignited, causing the fuel to explode and the flame is ejected from the flame outlet to kill mosquitoes. After the explosion, the switch returns to the closed state and the gas supply stops.

[0017] 2. The mosquito-killing device provided by this utility model has a first air inlet connected to an air guide channel through a first gap, so that when fuel is filled into the first section, air enters the first section from the first air inlet and mixes with the fuel to achieve a thorough mixing effect.

[0018] 3. The mosquito-killing device provided by this utility model has a misaligned arrangement between the side inlet and the first air inlet. When the fuel is ignited, some flames leak out from the side inlet. However, due to the misalignment between the side inlet and the first air inlet, the leaked gas cannot be ejected from the first air inlet, but instead is sprayed onto the inner wall of the extension tube, thus reducing flame leakage. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a front view of a mosquito-killing device provided in one embodiment of the present invention; Figure 2 for Figure 1 Left view of the flamethrower and tilted nozzle; Figure 3 for Figure 1 Front view of the flow restrictor in the extension tube; Figure 4 for Figure 3 A front view of one embodiment of the current limiting component in the middle; Figure 5 for Figure 3 A front view of the second embodiment of the current-limiting component in the middle; Figure 6 for Figure 1 Front view of the inclined nozzle; Figure 7 for Figure 5 The left view in the image.

[0021] Explanation of reference numerals in the attached figures: 1. Flamethrower; 2. Jet nozzle; 3. Switch; 4. Extension tube; 5. Air guide channel; 6. Flow restrictor; 7. Flame outlet; 8. Flow restrictor channel; 9. First section; 10. Second section; 11. First gap; 12. First air inlet; 13. Side inlet; 14. Connecting pipe; 15. Second gap; 16. Inclined nozzle; 17. Flared part; 18. First guide plate; 19. Second guide plate; 20. Heat insulation sleeve; 21. Second air inlet; 22. Circular ring. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] The mosquito-killing device provided in this embodiment is used to kill mosquitoes with a jet flame, thereby achieving the effect of mosquito control.

[0027] like Figure 1The image shows a specific embodiment of the mosquito-killing device provided in this example, comprising: a flame gun 1 and an extension tube 4. The flame gun 1 has a jet pipe 2 and a switch 3. Fuel is filled inside the flame gun 1 and can be ejected from the jet pipe 2. The switch 3 has two positions: a jet position and an ignition position. The jet position causes the jet pipe 2 to eject gaseous fuel; the ignition position ignites the ejected gaseous fuel. An air guide channel 5 is formed inside the extension tube 4. When the switch 3 is in the jet position, fuel enters the air guide channel 5 of the extension tube 4. One end of the air guide channel 5 is connected to the jet pipe 2, and the other end forms a flame outlet 7. A flow restrictor 6 is disposed within the air guide channel 5 of the extension tube 4. The flow restrictor 6 has a flow restricting channel 8 with an inner diameter smaller than that of the air guide channel 5. A first section 9 and a second section 10 are connected through the air guide channel 5. After the fuel enters the gas guide channel 5, the small inner diameter of the flow restrictor 6 makes it difficult for the fuel to flow out from the flame outlet 7. The flow restrictor 6 divides the gas guide channel 5 into a first section 9 close to the flame gun 1 and a second section 10 far away from the flame gun 1, so that the fuel fills the first section 9. When the fuel reaches the explosive concentration, the fuel is ignited and the fuel explodes and is ejected from the flame outlet 7 of the second section 10.

[0028] Specifically, the fuel is butane, with an explosive concentration of 1.9%-8.5%. In use, first, switch 3 is switched to the jetting position, filling the first section 9 of the extension tube 4 with butane. After a short time (1-3 seconds), the gaseous fuel in the first section 9 of the extension tube 4 reaches an explosive concentration. Then, switch 3 is switched to the ignition position, igniting the ejected fuel and thus igniting the gaseous fuel in the first section 9 of the extension tube 4. After ignition, the fuel in the first section 9 of the extension tube 4 burns, and the resulting flame passes through the flow restrictor 6 into the second section 10 of the extension tube 4, and is ejected all at once from the flame outlet 7 of the second section 10. After the fuel in the first section 9 undergoes explosive combustion, switch 3 is promptly returned to the closed state. Of course, the above description is not limiting; in some alternative embodiments, the fuel can also be propane, acetylene, or other fuels.

[0029] By setting a flow restrictor 6 inside the extension tube 4, the flow restrictor 6 divides the extension tube 4 into a first section 9 and a second section 10. When the switch 3 is in the jet position, fuel is filled into the first section 9. When the switch 3 is in the ignition position, the fuel in the first section 9 is ignited, causing the fuel to explode and spray out from the flame outlet 7 to kill mosquitoes. When the switch 3 is turned to the off position, the gas supply is stopped.

[0030] Specifically, switch 3 can be configured as an automatically resetting switch controlled by an elastic element, which can be a spring. One end of the spring is connected to switch 3, and the other end is connected to the flamethrower 1. The spring has the force to keep switch 3 in the closed state. Of course, the above description is not limiting. In some alternative embodiments, the spring can also be a tension spring, torsion spring, etc.

[0031] like Figure 1 , Figure 2 As shown, in this embodiment, the jet pipe 2 extends entirely into one end of the air guide channel 5 of the extension pipe 4, that is, the jet pipe 2 is located at one end of the first section 9 of the extension pipe 4, allowing fuel ejected from the jet pipe 2 to enter the first section 9. The outer diameter of the jet pipe 2 is smaller than the inner diameter of the extension pipe 4, resulting in a first gap 11 between the outer wall of the jet pipe 2 and the inner wall of the air guide channel 5 of the extension pipe 4. A first air inlet 12 is provided on the outer wall of the extension pipe 4, facing the outer wall of the jet pipe 2. The first air inlet 12 communicates with the air guide channel 5 through the first gap 11, allowing air to enter the first section 9 from the first air inlet 12 and mix with the fuel when filling the first section 9 with fuel, achieving a thorough mixing effect. Of course, the above description is not limiting. In some alternative embodiments, part of the jet pipe 2 can be located inside the extension pipe 4, and part can be located outside the extension pipe 4, without needing to extend entirely inside. Of course, the above description is not limiting. In some alternative embodiments, the first gap 11 may not be provided between the jet pipe 2 and the extension pipe 4, and the first air inlet 12 may be provided on the extension pipe 4 and directly connected to the air guide channel 5.

[0032] Specifically, such as Figure 1 , Figure 3 As shown, a heat insulation component is provided on the outer surface of the extension tube 4. The heat insulation component is a circular tubular structure, specifically a heat insulation sleeve 20 made of heat insulation material. The heat insulation sleeve 20 can be made of leather, plastic, rubber, aramid fiber, glass fiber, etc.

[0033] like Figure 2As shown, in this embodiment, the outer wall of the jet pipe 2 has a side inlet 13, which communicates with the interior of the jet pipe 2. This allows air to enter through the side inlet 13 and initially mix with the fuel when the jet pipe 2 ejects fuel. After mixing, the fuel enters the air guide channel 5. The side inlet 13 and the first air inlet 12 are offset in the axial direction of the extension pipe 4. The side inlet 13 is closer to the flame outlet 7 than the first air inlet 12. In other words, air enters the first gap from the first air inlet 12, and then mixes with the fuel through the side inlet 13 before being ejected. This ensures that the fuel and air are fully mixed before entering the air guide channel 5, thereby accelerating the mixing speed of the fuel in the first section 9 and reducing the emission of unburned fuel. The misalignment of the side inlet 13 and the first air inlet 12 allows some flame to leak out from the side inlet 13 during fuel combustion. However, due to the misalignment, the leaked gas cannot exit from the first air inlet 12 but instead sprays onto the inner wall of the extension pipe 4, reducing flame leakage. Of course, the above description is not limiting. In some alternative embodiments, the side inlet 13 may be omitted, and air may enter the first section 9 of the extension pipe 4 from the first air inlet 12. The positions of the side inlet 13 and the first air inlet 12 can also be varied. For example, the side inlet 13 can be positioned away from the flame outlet 7, while the first air inlet 12 is close to the flame outlet 7.

[0034] like Figure 2 , Figure 3 As shown, in this embodiment, a connecting pipe 14 is provided between the jet pipe 2 and the extension pipe 4 at one end near the flame outlet 7. The connecting pipe 14 is sleeved on the outside of the jet pipe 2. The connecting pipe 14 seals the end of the first gap 11, that is, the first air inlet 12 is connected to the side inlet 13 through the first gap 11. At this time, the first air inlet 12 cannot be directly connected to the air guide channel 5, and the flame cannot be ejected from the first air inlet 12 when the gas deflagrates, further reducing the degree of leakage and ensuring that the flame ejected from the flame outlet 7 is sufficient to burn mosquitoes. Of course, the above description is not limiting. In some alternative embodiments, the connecting pipe 14 can also be integrally formed with the jet pipe 2.

[0035] like Figure 4 , Figure 5As shown, in this embodiment, a second gap 15 exists between the outer wall of the flow restrictor 6 and the inner wall of the gas guide channel 5 of the extension pipe 4. A second air inlet 21 is provided on the outer wall of the extension pipe 4, and the second air inlet 21 is opposite to the outer wall of the flow restrictor 6. The second air inlet 21 is connected to the gas guide channel 5 through the second gap 15. When the gas is ignited, the flame enters the second section 10 from the flow restrictor 6. The pressure inside the second section 10 is greater than the external pressure, and the gas moves outward at high speed. After moving a certain distance, the pressure in the second section 10 is equal to the external pressure. However, due to the inertia of the high-speed gas, the pressure in the second section 10 is less than the external pressure when it continues to be ejected outward. At this time, the outside air will be drawn into the second section 10 through the second air inlet 21 to replenish the low pressure inside the second section 10. At the same time, it can also fully react with the incompletely burned butane to enhance the flame power. Of course, the above description is not limiting. In some alternative embodiments, the second air inlet 21 may also be located in the middle of the second section 10. The second air inlet 21 may also be directly connected to the second section 10 of the extension pipe 4.

[0036] like Figure 3 , Figure 4 As shown, in this embodiment, the outer diameter of the flow restrictor 6 near the flame outlet 7 is tapered, forming a second gap 15 between the tapered structure and the inner wall of the extension tube 4. That is, when outside air enters the second gap 15, the outer diameter of the flow restrictor 6 gradually contracts, and the air moves along the inclined outer surface towards the center of the extension tube 4, accelerating the rapid mixing of air and fuel gas, resulting in more complete combustion. Of course, the above description is not limiting. In some alternative embodiments, the second gap 15 may not be provided on the flow restrictor 6, and the inner surface of the extension tube 4 may be configured as a tapered structure. The entire outer diameter of the flow restrictor 6 can be configured as a tapered structure. In some alternative embodiments, such as... Figure 7 As shown, the flow restrictor 6 may not have a tapered structure. The flow restrictor 6 is cylindrical with openings at both ends along its axis. A certain distance is provided between the flow restrictor 6 and the second air inlet 21. When the flame passes through the flow restrictor, the outside air flows into the extension pipe 4 from the second air inlet 21, where it mixes and burns further with the flame. Afterward, the gas is ejected from the flame outlet 7.

[0037] like Figure 6 , Figure 7As shown, in this embodiment, the outlet of the jet pipe 2 is equipped with a speed-reducing structure. This structure reduces the velocity of the gas ejected from the jet pipe 2, allowing the gas to gradually fill the flow-limiting pipe from the first section 9 of the extension pipe 4. This results in better mixing during gas filling and ensures effective combustion. Of course, the above description is not limiting. In some alternative embodiments, the jet pipe 2 may not have a speed-reducing structure, and the fuel may directly enter the first section 9 of the extension pipe 4, still achieving the burning effect on mosquitoes.

[0038] like Figure 1 , Figure 6 As shown, in this embodiment, the outlet of the jet pipe 2 is detachably connected to an inclined nozzle 16. The inclined nozzle 16 has an outlet inclined towards the inner wall of the extension pipe 4. When the gas and air are ejected from the jet pipe 2 along the axial direction of the extension pipe 4, the gas reaches the inclined nozzle 16. Through the inclined outlet of the inclined nozzle 16, the direction of the gas is changed towards the inner wall of the extension pipe 4. After multiple changes in direction, the mixing effect of the gas and air is better, and the combustion effect during deflagration is better. The inclined nozzle 16 is used to make the gas ejected from the jet pipe 2 obliquely ejected towards the inner wall of the extension pipe 4. Of course, the above description is not limiting. In some alternative embodiments, the inclined nozzle 16 can be fixedly installed on the inner wall of the extension pipe 4. The inclined nozzle 16 can also be fixedly connected to the jet pipe 2. The inclined nozzle 16 can also be a plate obliquely installed inside the extension pipe 4.

[0039] Specifically, such as Figure 6 , Figure 7 As shown, the inclined nozzle 16 includes: an inclined first guide plate 18 and a second guide plate 19, which together form an inclined outlet. The second guide plate 19 is positioned between the two first guide plates 18, and the angle between the second guide plate 19 and the extension pipe 4 is greater than the angle between the first guide plate 18 and the extension pipe 4. When the gas encounters the first guide plate 18 and the second guide plate 19, it is redirected to different injection directions by the first guide plate 18 and the second guide plate 19, respectively. The cross-section of the second guide plate 19 is arc-shaped. Figure 6 , Figure 7The arrows indicate the direction of gas flow. When the gas encounters the curved second guide plate 19, it has better aerodynamic effect, with less resistance and a faster flow velocity. The width of the second guide plate 19 gradually increases from the air inlet side towards the flame outlet 7 side. That is, the gas first encounters the narrower side of the second guide plate 19, and then the width increases as it moves, resulting in better mixing of gas and air. The first guide plate 18 and the second guide plate 19 are fixedly connected. A connector, which is a ring 22, is provided on the side of the first guide plate 18 and the second guide plate 19 facing the jet pipe 2 and is detachably connected to the jet pipe 2. The ring 22 is sleeved on the outside of the jet pipe 2. Of course, the above description is not limiting. In some alternative embodiments, the second guide plate 19 is a straight plate. Of course, the above description is not limiting. In some alternative embodiments, the inclined nozzle 16 may only have the first guide plate 18. Of course, the above description is not limiting. In some alternative embodiments, the included angle of the second guide plate 19 is smaller than the included angle of the first guide plate 18. Of course, the above description is not limiting; in some alternative embodiments, the connector is threaded to the jet pipe 2.

[0040] like Figure 1 As shown, in this embodiment, the extension tube 4 is provided with a flared part 17 at one end of the flame outlet 7. The diameter of the flared part 17 gradually increases from the flame outlet 7 outwards. The flared part 17 allows the flame ejected from the flame outlet 7 to spread over a wider area, resulting in a wider strike range and making it easier to strike mosquitoes. Of course, the above description is not limiting. In some alternative embodiments, the flared part 17 may not be provided, and the flame can still be ejected from the flame outlet 7, achieving the same effect of striking mosquitoes.

[0041] like Figure 1 As shown, in this embodiment, the extension tube 4 has a color-changing coating on its inner wall at least at the flame outlet 7. This coating is used to burn as the flame passes over it, thus changing the flame's color. The color-changing layer is a copper powder layer; when the flame passes over it, the copper powder burns, producing a green flame. This color change simultaneously alerts personnel that a flame eruption has been completed, resulting in a more vibrant flame color and a better warning effect compared to a flame without the color-changing coating. Of course, the above description is not limiting; in some alternative embodiments, the color-changing coating can also be other substances containing elements such as calcium, sodium, and potassium.

[0042] Installation method of the mosquito-killing device: The flame gun 1 is 118mm long, the jet pipe 2 is 67mm long, the first section 9 of the extension pipe 4 is 374mm long, and the second section 10 is 218mm long. The outer diameter of the extension pipe 4 is 25mm, and the inner diameter is 24mm. The jet pipe 2 is provided at the axial end of the flame gun 1, and a side inlet 13 is provided on the jet pipe 2. A connecting pipe 14 is installed on the jet pipe 2. An inclined nozzle 16 is installed at the front end of the jet pipe 2, and the ring 22 of the inclined nozzle 16 is fitted onto the jet pipe 2. A first air inlet 12 is provided on the extension pipe 4. When the extension pipe 4 is inserted into the flame gun 1, the jet pipe 2 is located inside the extension pipe 4. A flow restrictor 6 is provided on the side of the extension pipe 4 away from the flame gun 1, and a second air inlet 21 is provided on the extension pipe 4. A flared part 17 is provided at the end of the extension pipe 4 away from the flame gun 1. The lengths of the first section 9 and the second section 10 of the extension tube 4 are not restrictive and can be adjusted by those skilled in the art according to actual needs.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A mosquito-killing device, characterized in that, include: A flame gun (1) has a jet pipe (2) and a switch (3), the switch (3) having a jet position for ejecting gaseous fuel from the jet pipe (2) and an ignition position for igniting the ejected gaseous fuel. An extension tube (4) is provided, and an air guide channel (5) is formed inside the extension tube (4). One end of the air guide channel (5) is connected to the jet pipe (2), and the other end forms a flame outlet (7). A flow restrictor (6) is disposed in the air guide channel (5) of the extension tube (4). The flow restrictor (6) has a flow restrictor channel (8) with an inner diameter smaller than that of the air guide channel (5). The flow restrictor (6) divides the air guide channel (5) into a first section (9) close to the flame gun (1) and a second section (10) away from the flame gun (1). The first section (9) and the second section (10) are connected through the air guide channel (5). In use, first, switch (3) is switched to the jet position to fill the first section (9) of the extension tube (4) with gaseous fuel. After a certain time, the gaseous fuel in the first section (9) of the extension tube (4) reaches the explosive concentration. Then, switch (3) is switched to the ignition position to ignite the gaseous fuel in the first section (9) of the extension tube (4). The resulting flame passes through the flow restrictor (6) and enters the second section (10) of the extension tube (4). Finally, the flame generated by burning the gaseous fuel in the first section (9) of the extension tube (4) is ejected from the flame outlet (7) all at once.

2. The mosquito-killing device according to claim 1, characterized in that, At least a portion of the jet pipe (2) extends into one end of the air guide channel (5) of the extension pipe (4). There is a first gap (11) between the outer wall of the jet pipe (2) and the inner wall of the air guide channel (5) of the extension pipe (4). A first air inlet (12) is provided on the outer wall of the extension pipe (4). The first air inlet (12) is opposite to the outer wall of the jet pipe (2). The first air inlet (12) communicates with the air guide channel (5) through the first gap (11).

3. The mosquito-killing device according to claim 2, characterized in that, The outer wall of the jet pipe (2) has a side inlet (13), which is connected to the interior of the jet pipe (2). The side inlet (13) is offset from the first air inlet (12) in the axial direction, and the side inlet (13) is closer to the flame outlet (7) than the first air inlet (12).

4. The mosquito-killing device according to claim 3, characterized in that, A connecting pipe (14) is provided between the jet pipe (2) and the extension pipe (4) at one end near the flame outlet (7), and the connecting pipe (14) is sealed at the end of the first gap (11).

5. The mosquito-killing device according to claim 1, characterized in that, There is a second gap (15) between the outer wall of the flow restrictor (6) and the inner wall of the air guide channel (5) of the extension tube (4). A second air inlet (21) is provided on the outer wall of the extension tube (4). The second air inlet (21) is opposite to the outer wall of the flow restrictor (6). The second air inlet (21) is connected to the air guide channel (5) through the second gap (15).

6. The mosquito-killing device according to claim 5, characterized in that, The flow restrictor (6) has a tapered outer diameter at least at one end near the flame outlet (7), forming the second gap (15) between the tapered structure and the inner wall of the extension tube (4).

7. The mosquito-killing device according to claim 1, characterized in that, The outlet of the jet pipe (2) is provided with a speed reduction structure.

8. The mosquito-killing device according to claim 7, characterized in that, The outlet of the jet pipe (2) is connected to an inclined nozzle (16), which has an outlet that is inclined toward the inner wall of the extension pipe (4). The inclined nozzle (16) is used to make the gas ejected from the jet pipe (2) be ejected at an angle toward the inner wall of the extension pipe (4).

9. The mosquito-killing device according to any one of claims 1-8, characterized in that, The extension tube (4) is provided with a flared part (17) at one end of the flame outlet (7), and the diameter of the flared part (17) gradually increases from the flame outlet (7) toward the outside.

10. The mosquito-killing device according to any one of claims 1-8, characterized in that, The extension tube (4) has a color-changing coating on its inner wall at least at the flame outlet (7). The color-changing coating is used to burn the flame as it passes by, thereby giving the flame a color.

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