Flame gun with self-flameout function
By designing an inclined air inlet channel and a sealing ring and steel ball structure in the flamethrower, the problem of flashback of the burner assembly is solved, the self-extinguishing function is achieved, and safety and normal use are ensured.
Patent Information
- Application Number
- CN202422622553.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Existing flamethrowers are prone to backfire when the front end of the burner assembly is facing downward, causing safety hazards such as burns to users and explosion of the gas cylinder due to heat.
An inclined air intake channel is designed with an embedded sealing ring and steel ball structure. The cooperation between the steel ball and the sealing ring prevents the gas from flowing into the valve body, realizing the self-extinguishing function; the push-up assembly is used to restore the gas flow when needed.
It effectively prevents the burner assembly from backfiring to the rear, preventing burns to users and explosions of gas cylinders, ensuring safety while allowing gas to flow during normal use.
Smart Images
Figure CN223345394U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flamethrowers, in particular to a flamethrower with a self-extinguishing function. Background Art
[0002] A flamethrower is a device for spraying a burning flame. Currently, flamethrowers on the market mainly include a shell assembly, a valve body assembly and a burner assembly; the valve body assembly is fixed inside the shell assembly, the burner assembly is fixed at the front end of the shell assembly, the air inlet end of the valve body assembly is connected to an air inlet connector, the air inlet channel in the air inlet end of the valve body assembly is communicated with the air inlet connector, the air inlet connector is used to be connected to the tank port of the gas cylinder, the air inlet end of the burner assembly is connected to the air outlet end of the valve body assembly, and an igniter is provided on the shell assembly; when the valve body assembly is in a conducting state and the gas from the gas cylinder is sprayed out from the burner assembly through the valve body assembly, when the user presses the igniter, the igniter can ignite the gas sprayed from the burner assembly and cause the gas to burn; however, during use of the existing flamethrower, when the front end of the burner assembly is facing downward, the burner assembly will backfire toward the rear side, which can easily cause burns to the user and even cause the gas cylinder to explode due to heat, posing a major safety hazard. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a flamethrower with a self-extinguishing function, which can effectively prevent the burner assembly from backfiring toward the rear side, thereby preventing the user from being scalded, and can prevent the gas tank from exploding due to heat, eliminating safety hazards.
[0004] The utility model provides a flamethrower with a self-extinguishing function, comprising a shell assembly, a valve body assembly and a burner assembly; the valve body assembly is fixed inside the shell assembly, the burner assembly is fixed at the front end of the shell assembly, an air inlet end of the valve body assembly is connected to an air inlet joint, an air inlet channel in the air inlet end of the valve body assembly is communicated with the air inlet joint, the air inlet joint is used to be connected to the tank mouth of a gas tank, and the air inlet end of the burner assembly is connected to the air outlet end of the valve body assembly; the air inlet channel is arranged obliquely, a sealing ring is embedded on the inner wall of the upper part of the air inlet channel, a steel ball is arranged in the air inlet channel below the sealing ring, and the steel ball is gap-matched with the inner wall of the air inlet channel; the valve body assembly is also connected to a pushing assembly, an operating end of the pushing assembly extends out of the shell assembly, and a pushing end of the pushing assembly extends into the air inlet channel above the sealing ring.
[0005] After adopting the above structure, the utility model uses the flamethrower in the process of using the flamethrower, when the front end of the burner assembly is facing downward, the steel ball located in the air inlet channel can roll to the sealing ring and abut against the sealing ring (because the air inlet channel is arranged obliquely, when the front end of the burner assembly is facing downward, the steel ball can roll along the air inlet channel to the sealing ring), and the gas from the gas tank can press the steel ball against the sealing ring, so that under the action of the steel ball and the sealing ring, the gas from the gas tank can be prevented from flowing through the air inlet channel and entering the valve body, thereby stopping the front end of the burner assembly from spraying flames, that is, effectively preventing the burner assembly from backfired toward the rear side, thereby preventing the user from being The situation of burns can be avoided, and the situation of gas cylinder being heated and exploded can be avoided, thereby eliminating safety hazards; when the flamethrower needs to be used again, the user can restore the front end of the burner assembly to the forward state, and then press the operating end of the pushing assembly to make the pushing end of the pushing assembly push the steel ball and make the steel ball separate from the sealing ring. At this time, the gas from the gas tank and entering the air inlet channel can enter the top of the steel ball again (the steel ball and the air inlet channel gap are matched, and the gas can flow through the gap between the steel ball and the inner wall of the air inlet channel), and make the gas flow normally through the valve body assembly and be ejected from the burner assembly, so that the user can press the igniter again to make the igniter ignite the gas ejected from the burner assembly.
[0006] In a possible embodiment, an annular step is provided on the inner wall of the upper part of the air intake passage, and an annular groove is provided on the side wall of the annular step. The upper end of the sealing ring rests on the annular step, and the outer edge of the sealing ring is stuck in the annular groove. After adopting this structure, under the action of the annular step, the annular step can reliably support the sealing ring, and under the action of the annular groove, the sealing ring can be reliably embedded in the inner wall of the air intake passage, that is, the sealing ring can be reliably installed, and has the advantage of convenient installation of the sealing ring.
[0007] The O-ring is pressed between the inner bottom of the connecting interface and the lower end of the pressing sleeve, and the O-ring is sleeved on the outer wall of the housing to prevent the ejector from separating from the housing assembly. When the gas cylinder is in the airtight position, the gas cylinder will be in the airtight position, and the gas will be in the airtight position when the gas cylinder is in the airtight position, so the gas cylinder will be in the airtight position when the gas cylinder is in the airtight position, and the gas will be in the airtight position when the gas cylinder is in the airtight position.
[0008] In a possible embodiment, the lower end surface of the push rod forms a hemispherical surface; by adopting this structure, when the lower end of the push rod passes through the sealing ring and pushes the steel ball, the outer edge of the lower end of the push rod can be prevented from cutting the sealing ring.
[0009] In one possible embodiment, a groove is provided at the lower end of the pressing sleeve, and the O-ring is embedded in the groove, the upper end of the O-ring is tightly sealed with the inner top surface of the groove, and the lower end surface of the O-ring is tightly sealed with the inner bottom surface of the connecting interface; by adopting this structure, the O-ring can be reliably embedded on the lower end of the pressing sleeve and the O-ring can be limited, thereby improving the reliability of the O-ring after assembly, and enabling the O-ring to be reliably pressed on the inner bottom of the connecting interface, and at the same time further ensuring that the O-ring reliably seals the gap between the push rod and the pressing sleeve and the valve body assembly.
[0010] In one possible embodiment, a ring-shaped protrusion is provided on the outer peripheral wall of the upper part of the pressing sleeve, and the outer peripheral wall of the protrusion forms a regular hexagonal structure; by adopting this structure, under the action of the protrusion and because the outer peripheral wall of the protrusion forms a regular hexagonal structure, it is convenient for the wrench to cooperate with the protrusion and rotate the pressing sleeve, so that the pressing sleeve can be reliably and conveniently screwed onto the connection interface of the valve body assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic cross-sectional view of the utility model;
[0012] Figure 2 for Figure 1 Schematic diagram of the structure after enlarging point A in the middle. DETAILED DESCRIPTION
[0013] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.
[0014] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.
[0015] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0016] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] See also Figure 1-2As shown, the embodiment of the present application discloses a flamethrower with a self-extinguishing function, comprising a shell assembly 1, a valve body assembly 2 and a burner assembly 3; the valve body assembly 2 is fixed inside the shell assembly 1, the burner assembly 3 is fixed at the front end of the shell assembly 1, the air inlet end of the valve body assembly 2 is connected with an air inlet joint 4, the air inlet channel 21 in the air inlet end of the valve body assembly 2 is communicated with the air inlet joint 4, the air inlet joint 4 is used to be connected to the tank mouth of the gas tank, and the air inlet end of the burner assembly 3 is connected to the air outlet end of the valve body assembly 2; the air inlet channel 21 is inclined, and a sealing ring 5 is embedded on the inner wall of the upper part of the air inlet channel 21, and a steel ball 6 is provided in the air inlet channel 21 below the sealing ring 5, and the steel ball 6 is gap-fitted with the inner wall of the air inlet channel 21; the valve body assembly 2 is also connected to a pushing assembly 7, the operating end of the pushing assembly 7 extends out of the shell assembly 1, and the pushing end of the pushing assembly 7 extends into the air inlet channel 21 above the sealing ring 5.
[0018] Under normal conditions, when the valve body assembly is in a conducting state and the gas from the gas tank is ejected from the burner assembly through the valve body assembly, when the user presses the igniter, the igniter can ignite the gas ejected from the burner assembly and cause the gas to burn; during the use of the flamethrower, when the front end of the burner assembly is facing downward, the steel ball located in the air inlet channel can roll to the sealing ring and abut against the sealing ring (because the air inlet channel is inclined, when the front end of the burner assembly is facing downward, the steel ball can roll along the air inlet channel to the sealing ring), and the gas from the gas tank can press the steel ball against the sealing ring, so that under the action of the steel ball and the sealing ring, the gas from the gas tank can be prevented from flowing through the air inlet channel and entering the valve body, thereby stopping the front end of the burner assembly from ejecting flames, that is, it can This effectively prevents the burner assembly from backfiring toward the rear, thereby preventing users from being scalded and preventing the gas cylinder from exploding due to heat, eliminating safety hazards. When the flamethrower needs to be used again, the user can restore the front end of the burner assembly to a forward position, and then press the operating end of the push assembly to push the steel ball with the push end of the push assembly and separate the steel ball from the sealing ring. At this time, the gas from the gas tank and entering the air intake channel can enter the top of the steel ball again (the steel ball and the air intake channel are in good agreement, and the gas can flow through the gap between the steel ball and the inner wall of the air intake channel), and make the gas flow normally through the valve body assembly and be ejected from the burner assembly, so that the user can press the igniter again to make the igniter ignite the gas ejected from the burner assembly.
[0019] An annular step 22 is provided on the inner wall of the upper part of the air intake passage 21, and an annular groove 23 is provided on the side wall of the annular step 22. The upper end of the sealing ring 5 rests on the annular step 22, and the outer edge of the sealing ring 5 is stuck in the annular groove 23. After adopting this structure, under the action of the annular step, the annular step can reliably support the sealing ring, and under the action of the annular groove, the sealing ring can be reliably embedded in the inner wall of the air intake passage, that is, the sealing ring can be reliably installed, and has the advantage of convenient installation of the sealing ring.
[0020] The push assembly 7 includes a push rod 71, a pressing sleeve 72, a spring 73 and an O-ring 74; the pressing sleeve 72 is threadedly connected to the connection interface 24 at the upper end of the valve body assembly 2, and the lower end of the push rod 71 is movable through the pressing sleeve 72 and extends into the air intake channel 21 above the sealing ring 5. The lower end of the push rod 71 forms the push end of the push assembly 7, and the lower end of the push rod 71 is in clearance with the air intake channel 21 and can slide relative to the air intake channel 21. The outer diameter of the push rod 71 is smaller than the inner diameter of the sealing ring 5; the upper end of the push rod 71 is movable through the shell assembly 1 and The cam 711 is provided on the outer wall of the upper part of the push rod 71, and the upper end of the pressing sleeve 72 is provided with a sliding cavity 721 for the axial sliding of the annular cam 711. The spring 73 is sleeved on the outside of the push rod 71, and the two ends of the spring 73 respectively abut against the inner bottom of the sliding cavity 721 and the lower end surface of the annular cam 711. The annular cam 711 abuts against the inner wall of the housing assembly 1 to prevent the push rod 71 from separating from the housing assembly 1; the O-ring 74 is pressed tightly against the connection interface 24 The O-ring 74 is sleeved on the push rod 71 between the inner bottom of the sleeve and the lower end of the pressure sleeve 72, and the inner peripheral wall of the O-ring 74 is tightly sealed with the outer peripheral wall of the push rod 71; after adopting this structure, when the steel ball abuts against the lower end of the sealing ring, and the gas from the gas tank and entering the air inlet passage presses the steel ball on the lower end of the sealing ring, when it is necessary to make the steel ball detach from the sealing ring, the upper end of the push rod can be pressed downward. At this time, the lower end of the push rod can push the steel ball to detach the steel ball from the sealing ring. After the steel ball detaches from the sealing ring, the gas from the gas tank and entering the air inlet passage presses the steel ball against the lower end of the sealing ring. The gas in the air intake passage can enter the top of the steel ball again (the steel ball and the air intake passage are fitted together, and the gas can flow through the gap between the steel ball and the inner wall of the air intake passage), so that the steel ball can freely fall to the lower end of the air intake passage under the action of gravity to release the blockage of the air intake passage; when the upper end of the push rod is released, the spring can push the annular convex edge upward, and at this time, the spring can push the push rod to move the push rod upward and reset; in addition, under the action of the O-ring, the O-ring can seal the gap between the push rod and the pressure sleeve and the valve body assembly.
[0021] The lower end surface of the push rod 71 forms a hemispherical surface; by adopting this structure, when the lower end of the push rod passes through the sealing ring and pushes the steel ball, it can avoid the outer edge of the lower end of the push rod from cutting the sealing ring.
[0022] The lower end of the pressing sleeve 72 is provided with a groove 722, and the O-ring 74 is embedded in the groove 722. The upper end of the O-ring 74 is tightly sealed with the inner top surface of the groove 722, and the lower end surface of the O-ring 74 is tightly sealed with the inner bottom surface of the connecting interface 24. By adopting this structure, the O-ring can be reliably embedded on the lower end of the pressing sleeve and the O-ring can be limited, thereby improving the reliability of the O-ring after assembly, and enabling the O-ring to be reliably pressed on the inner bottom of the connecting interface, and at the same time, it can further ensure that the O-ring reliably seals the gap between the push rod and the pressing sleeve and the valve body assembly.
[0023] A ring-shaped protrusion 723 is provided on the outer peripheral wall of the upper part of the pressing sleeve 72, and the outer peripheral wall of the protrusion 723 forms a regular hexagonal structure; after adopting this structure, under the action of the protrusion and because the outer peripheral wall of the protrusion forms a regular hexagonal structure, it is convenient for the wrench to cooperate with the protrusion and rotate the pressing sleeve, so that the pressing sleeve can be reliably and conveniently screwed onto the connection interface of the valve body assembly.
[0024] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. A flamethrower with a self-extinguishing function, comprising a housing assembly (1), a valve body assembly (2) and a burner assembly (3); the valve body assembly (2) is fixed inside the housing assembly (1), the burner assembly (3) is fixed at the front end of the housing assembly (1), the air inlet end of the valve body assembly (2) is connected to an air inlet joint (4), an air inlet channel (21) in the air inlet end of the valve body assembly (2) is communicated with the air inlet joint (4), the air inlet joint (4) is used to be connected to the tank mouth of a gas tank, and the air inlet end of the burner assembly (3) is connected to the air outlet end of the valve body assembly (2); characterized in that: The air inlet channel (21) is arranged in an inclined manner, a sealing ring (5) is embedded on the inner wall of the upper part of the air inlet channel (21), a steel ball (6) is arranged in the air inlet channel (21) below the sealing ring (5), and the steel ball (6) is clearance-matched with the inner wall of the air inlet channel (21); the valve body assembly (2) is also connected to a push assembly (7), the operating end of the push assembly (7) extends outside the shell assembly (1), and the push end of the push assembly (7) extends into the air inlet channel (21) above the sealing ring (5).
2. The flame spray gun with self-extinguishing function according to claim 1, characterized in that: An annular step (22) is provided on the inner wall of the upper portion of the air inlet channel (21), and an annular groove (23) is provided on the side wall of the annular step (22). The upper end of the sealing ring (5) abuts against the annular step (22), and the outer edge of the sealing ring (5) is snapped into the annular groove (23).
3. The flame spray gun with self-extinguishing function according to claim 1 or 2, characterized in that: The push assembly (7) comprises a push rod (71), a pressing sleeve (72), a spring (73) and an O-ring (74); the pressing sleeve (72) is threadedly connected to the connection interface (24) located at the upper end of the valve body assembly (2); the lower end of the push rod (71) movably penetrates the pressing sleeve (72) and then extends into the air inlet channel (21) located above the sealing ring (5); the lower end of the push rod (71) forms the push end of the push assembly (7); the lower end of the push rod (71) is in clearance fit with the air inlet channel (21) and can slide relative to the air inlet channel (21); the outer diameter of the push rod (71) is smaller than the inner diameter of the sealing ring (5); the upper end of the push rod (71) movably penetrates the shell assembly (1) and then extends out of the shell assembly (1) and forms the operating end of the push assembly (7); the push rod (7 1) An annular convex edge (711) is provided on the outer wall of the upper portion, and a sliding cavity (721) is provided at the upper end of the pressing sleeve (72) for the annular convex edge (711) to slide axially, and the spring (73) is sleeved on the outside of the push rod (71), and the two ends of the spring (73) respectively abut against the inner bottom of the sliding cavity (721) and the lower end surface of the annular convex edge (711), and the annular convex edge (711) abuts against the inner wall of the housing assembly (1) to prevent the push rod (71) from separating from the housing assembly (1); the O-ring (74) is pressed between the inner bottom of the connecting interface (24) and the lower end of the pressing sleeve (72), and the O-ring (74) is sleeved on the push rod (71) and the inner peripheral wall of the O-ring (74) is tightly sealed against the outer peripheral wall of the push rod (71).
4. The flame spray gun with self-extinguishing function according to claim 3, characterized in that: The lower end surface of the push rod (71) forms a hemispherical surface.
5. The flame spray gun with self-extinguishing function according to claim 3, characterized in that: The lower end of the compression sleeve (72) is provided with a groove (722), and the O-ring (74) is embedded in the groove (722). The upper end of the O-ring (74) is tightly sealed with the inner top surface of the groove (722), and the lower end surface of the O-ring (74) is tightly sealed with the inner bottom surface of the connection interface (24).
6. The flame spray gun with self-extinguishing function according to claim 3, characterized in that: A ring-shaped protrusion (723) is provided on the outer peripheral wall of the upper portion of the pressing sleeve (72), and the outer peripheral wall of the protrusion (723) forms a regular hexagonal structure.