Gas outlet valve for flame gun and flame gun

Abstract

The utility model discloses a flame gun and a gas outlet valve for the flame gun, and relates to the technical field of ignition. An air inlet metal piece; the valve element is movably arranged in the third opening end and is in threaded connection with the valve body, the valve element can be switched between a first state and a second state under the action of external force, and when the valve element is in the first state, the valve element seals an outlet of the gas inlet metal piece so as to block a gas channel between the gas inlet metal piece and the first opening end; and in the second state, the valve element is separated from closing the outlet, so that a communicated gas passage is formed between the gas inlet metal piece and the first opening end. The gas inlet metal piece (such as a copper piece) which is independently arranged is matched and sealed with the valve element, abrasion is relieved, sealing durability is improved, and gas is effectively prevented from leaking from a gas inlet connector and a valve element thread through the design of multiple sealing rings.

Description

TECHNICAL FIELD

[0001] The utility model relates to ignition technical field, concretely relates to a gas outlet valve for fire gun and fire gun. BACKGROUND

[0002] Fire gun usually supplies gas through gas tank, and controls gas on-off and flow through gas outlet valve. The gas outlet valve of existing fire gun adopts the structure that valve core directly seals air inlet, and the structure is easy to cause sealing to be not strict due to abrasion after long-term use, causes gas leakage or unstable adjustment. Meanwhile, the air inlet end of gas outlet valve is directly connected with gas tank, and since there is chamber between the air outlet hole of gas tank and air inlet end, leakage is easy to be caused due to material thermal expansion and contraction or vibration. SUMMARY

[0003] In view of the defects in the prior art, the utility model aims at providing a gas outlet valve for fire gun and fire gun.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A gas outlet valve for fire gun, comprising:

[0006] a valve body, which is provided with a gas passage, and the gas passage has at least three open ends, including a first open end as an air outlet, a second open end as an air inlet and a third open end for installing a valve core;

[0007] an air inlet metal piece arranged in the second open end and used for communicating with an external gas tank, wherein the air inlet metal piece has an outlet facing the gas passage;

[0008] a valve core movably arranged in the third open end and threadedly connected with the valve body, wherein the valve core can be switched between a first state and a second state under the action of external force,

[0009] in the first state, the valve core closes the outlet of the air inlet metal piece to block the gas passage between the air inlet metal piece and the first open end;

[0010] in the second state, the valve core is separated from the closure of the outlet, so that the air inlet metal piece and the first open end form a communicating gas passage.

[0011] The air inlet metal piece is an air inlet copper piece.

[0012] The air inlet metal piece is provided with a stepped surface in the circumferential direction, and a first sealing ring is arranged between the stepped surface and the valve body.

[0013] A second sealing ring is arranged between the front end of the air inlet metal piece and the valve body.

[0014] The second opening end and the third opening end are coaxially arranged, and the axis of the first opening end is perpendicular to the axis of the second opening end or the third opening end.

[0015] The valve core comprises a sealing end portion extending into the gas passage and an adjusting portion outside the valve body.

[0016] The end surface of the sealing end portion of the valve core in contact with the outlet of the gas inlet metal piece is a conical surface or a flat surface.

[0017] At least one third sealing ring is arranged between the valve core and the valve body.

[0018] A fire gun comprises a gun body, the gun body is provided with the gas outlet valve, the first opening end of the gas outlet valve is communicated with a fire outlet of the gun body, the second opening end is detachably connected with a gas tank, and the adjusting portion of the valve core is exposed from the gun body and is connected with an adjusting knob.

[0019] The beneficial effects of the utility model are as follows: the independent gas inlet metal piece (such as a copper piece) is matched with the valve core to seal, wear is reduced, sealing durability is improved, multiple sealing rings are designed, and gas leakage from the gas inlet interface and the valve core thread is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic view of the utility model (first state).

[0021] Figure 2 It is a cross-sectional schematic view of the utility model (second state).

[0022] Figure 3 It is a cross-sectional schematic view of the utility model applied to a fire gun. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain in a certain specific attitude (as shown in the drawings).

[0025] The utility model discloses a gas outlet valve for fire gun, which comprises a valve body 100, a gas inlet copper piece 200 and a valve core 300.

[0026] The valve body 100 is internally machined with a gas passage 110 having at least three open ends, wherein the first open end 120 is horizontally right as a gas outlet, and the second open end 130 and the third open end 140 are coaxially arranged vertically. The gas inlet copper piece 200 is pressed into the second open end 130, and the front end thereof is provided with a second sealing ring 220 between the valve body 100, and the middle step surface is sealed with a first sealing ring 230 and the inner wall of the second open end of the valve body is provided with threads for connecting the gas tank.

[0027] The gas inlet metal piece 200, which is a gas inlet copper piece in the embodiment, is arranged in the second open end 130 and is used for communicating with the external gas tank. The gas inlet copper piece 200 is provided with a through hole in the center, one end of which is provided as an outlet 210, and the other end is an inlet, which directly communicates with the external gas tank, so that the gas tank gas directly enters the gas passage through the gas inlet copper piece.

[0028] The valve core 300 is screwed into the third open end 140 and is provided with two third sealing rings 310 thereon to prevent gas leakage along the thread gap. The lower end of the valve core 300 is a sealing end 320, and the end face thereof is machined as a conical surface. The upper end is an adjusting part 330 for connecting the adjusting knob 600. The adjusting part can be machined as a square shaft or other non-circular shaft, which is inserted into the adjusting knob to realize the relative axial movement of the valve core driven by the adjusting knob. The threaded cooperation can realize the adjustment of the gas outlet amount.

[0029] The valve core 300 can be switched between the first state and the second state under the action of external force.

[0030] As shown in Figure 1 , when the valve core 300 is rotated to the lower end, the sealing end 320 thereof is pressed against the outlet 210 of the gas inlet copper piece 200 to realize sealing (first state). At this time, the gas cannot enter the gas passage 110 from the gas inlet copper piece 200.

[0031] As shown in Figure 2 , when the valve core 300 is rotated in the opposite direction, the sealing end 320 moves upward and is separated from the outlet 210 (second state). The gas from the gas tank 500 enters the gas passage 110 through the gas inlet copper piece 200, and then flows to the fire outlet of the gun body 700 from the first open end 120.

[0032] Since the air inlet copper piece 200 is arranged at the lower end of the valve body 100, in actual use, when the gas tank 500 is screwed at the second opening end of the valve body, it will press on the air inlet copper piece 200, thereby generating an upward axial pressure, which will press the air inlet copper piece 200 more tightly to the inside of the valve body 100. The pre-tightening force acts to uniformly compress the first sealing ring 230 in the radial direction and stably press the second sealing ring 220 in the axial direction, thereby forming a double reliable sealing interface between the air inlet copper piece 200 and the valve body 100. This structure not only effectively prevents high-pressure gas from leaking from the air inlet interface, but also actively enhances the sealing durability by using assembly stress. At the same time, the gas tank is directly communicated with the air inlet copper piece 200, and the gas directly enters the flow passage of the copper piece from the outlet of the gas tank, without passing through other joints or conversion structures, thereby reducing possible leakage points and improving the overall sealing reliability.

[0033] The sealing end part 320 of the valve core 300 directly forms a sealing pair with the end face of the outlet 210 of the air inlet copper piece 200. Specifically, the end face of the sealing end part 320 is usually processed into a conical surface (a flat surface can also be used), which cooperates with the corresponding edge or inner conical surface of the outlet 210 of the air inlet copper piece 200. In terms of material selection, the air inlet copper piece 200 is made of brass or similar copper alloy, and the sealing end part 320 of the valve core 300 is usually made of stainless steel or a high-hardness metal material such as heat-treated medium-carbon steel.

[0034] Traditional rubber or plastic sealing elements are prone to aging, creep or chemical degradation after being subjected to high temperature, long-term pressure or contact with gas medium, resulting in sealing failure.

[0035] The metal-metal direct bonding sealing adopted by the utility model does not have the aging problem of non-metallic materials, can withstand high-temperature radiation and gas medium generated during the operation of the fire gun, and has a significantly prolonged service life.

[0036] When the sealing end part is designed as a conical surface, the conical surface forms annular line contact or narrow surface contact with the outlet conical hole or edge of the copper piece. During the screwing process, the conical surface has an automatic centering effect, which can compensate for the coaxiality deviation of part processing or assembly. With the valve core being screwed further, the contact area gradually increases, and the unit area pressure remains at a high level, thereby realizing reliable sealing of high-pressure gas.

[0037] As shown in Figure 3 The utility model also discloses a fire gun, which comprises a gun body 700, the gun body 700 is equipped with the above-mentioned gas outlet valve, the first opening end 120 of the gas outlet valve is communicated with the fire outlet of the gun body 700, the second opening end 130 is detachably connected with the gas tank 500, the adjusting part 330 of the valve core 300 is exposed from the gun body 700 and is connected with the adjusting knob 600 in linkage, that is, the user can control the gas on-off and flow size by rotating the adjusting knob.

[0038] The embodiments should not be considered as limiting the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims

1. An air outlet valve for a flare gun, characterized by: The utility model relates to an air outlet valve, which comprises: a valve body (100) having a gas passage (110) with at least three open ends, including a first open end (120) as an air outlet, a second open end (130) as an air inlet, and a third open end (140) for mounting a valve core (300); an air inlet metal piece (200) arranged in the second open end (130) and used for communicating with an external gas tank, the air inlet metal piece (200) having an outlet (210) facing the gas passage (110); a valve core (300) movably arranged in the third open end (140) and threadedly connected with the valve body (100), the valve core (300) being switchable between a first state and a second state under an external force, in the first state, the valve core (300) closes the outlet (210) of the air inlet metal piece (200) to block the gas passage between the air inlet metal piece (200) and the first open end (120); in the second state, the valve core (300) is separated from the outlet (210) to form a communicating gas passage between the air inlet metal piece (200) and the first open end (120).

2. An air outlet valve for a flare gun according to claim 1, wherein: The air inlet metal piece (200) is an air inlet copper piece.

3. An air outlet valve for a flare gun according to claim 1 or 2, wherein: The air inlet metal piece (200) is provided with a stepped surface in the circumferential direction, and a first sealing ring (230) is arranged between the stepped surface and the valve body (100).

4. An air outlet valve for a flare gun according to claim 1 or 2, wherein: A second sealing ring (220) is arranged between the front end of the air inlet metal piece (200) and the valve body (100).

5. An air outlet valve for a flare gun as defined in claim 1, wherein: The second open end (130) and the third open end (140) are coaxially arranged, and the axis of the first open end (120) is perpendicular to the axes of the second open end (130) or the third open end (140).

6. An air outlet valve for a flare gun as defined in claim 1, wherein: The valve core (300) comprises a sealing end portion (320) extending into the gas passage and an adjusting portion (330) located outside the valve body (100).

7. An air outlet valve for a flare gun according to claim 6, wherein: The end surface of the sealing end portion (320) of the valve core (300) in contact with the outlet (210) of the air inlet metal piece (200) is a conical surface or a flat surface.

8. An air outlet valve for a flare gun according to claim 6, wherein: At least one third sealing ring (310) is arranged between the valve core (300) and the valve body (100).

9. A flare gun characterized by: The utility model relates to a gun body (700), the gun body (700) is provided with the air outlet valve of the above-mentioned claims 1-8, and the first open end (120) of the air outlet valve is communicated with the fire outlet of the gun body (700), the second open end (130) is detachably connected with the gas tank (500), the adjusting portion (330) of the valve core (300) is exposed to the gun body (700) and is arranged in linkage with an adjusting knob (600).

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