Ignition device outlet valve

Abstract

The present invention discloses an ignition device outlet valve. The technical solution adopted by the present invention is as follows: at least one air leakage groove is provided on the inner wall of the middle and lower part of the valve body; the inner cavity of the valve needle forms an axially arranged air outlet channel, and at least one radially arranged air vent is provided on the valve needle, and the air vent is located below the O-ring and communicates with the air outlet channel; when the air outlet valve is opened, the O-ring is located above the air leakage groove and the entire circle is sealed with the inner wall of the valve body, and the gas flows out from the valve seat along the air outlet channel from the upper end of the valve needle; the valve needle returns to a free state, and a residual gas channel is formed between the air leakage groove and the local O-ring corresponding thereto, and the rest of the O-ring is still sealed with the inner wall of the valve body, and the residual gas in the valve needle uses the air vent to flow through the residual gas channel and is discharged from the gap between the upper part of the valve body and the outer wall of the valve needle. The air outlet operation of the present invention is smooth, the air outlet flow is stable, and the damage to the O-ring is reduced.

Description

Technical Field

[0001] The invention relates to an ignition device, in particular to an ignition device gas outlet valve. Background Art

[0002] The general structure of the air outlet valve used for ignition guns and lighters, such as Figure 1-2 As shown, it includes a valve needle, a sealing ring, a compression spring, a valve body, a base and a T-shaped rubber plug. The sealing ring is tightly sleeved outside the valve needle and close to the inner wall of the valve body. Its upper end is limited to the shoulder of the valve body, and the lower end is supported by the compression spring, so that the valve body and the valve needle are always in a sealed state. The outlet valve of the above structure has the following problems: when the ignition is completed, the outlet valve is already in a closed state, but the residual gas in the outlet valve will continue to burn, and it generally takes 5-10 seconds to extinguish, which does not meet the safety requirement of extinguishing within 3 seconds, which is easy to cause fire and poses a safety hazard.

[0003] At present, there are some ignition devices that can extinguish the flame within 3 seconds after ignition is completed, which can meet the extinguishing safety requirements.

[0004] Chinese Patent No. 200910215376.3 discloses an air outlet valve, the structure of which is as follows: Figure 3-4 As shown in the figure, the outlet valve includes a valve needle, a sealing ring, a compression spring, a valve body, a base and a T-shaped rubber plug. The valve needle is in the valve body, the compression spring is sleeved on the outer ring of the valve needle, and the sealing ring is placed above the compression spring. When the valve needle rises, the upper end of its sealing ring is limited to the shoulder in the valve body, and the gas flows out along the inner cavity of the valve needle. When the valve needle returns to its position, the remaining gas inside the valve needle flows into the channel between the valve body and the valve needle through the through hole opened in the middle and upper part of the valve needle, and flows out upward. The disadvantages of this structure are: the quality requirements for the compression spring are high. After multiple operations, the compression spring is compressed and it is easy to leak between the sealing ring and the valve needle; the valve needle is a metal part. Since a through hole is opened on it, the strength of the valve needle is weakened and it is easy to be broken, which affects the service life of the valve needle; in addition, during the ignition operation, the sealing ring contacts the valve needle located at the through hole. Since the valve needle is made of metal, the sealing ring is more easily worn. Therefore, the manufacturing process requirements for each accessory are high, the quality is difficult to control, and the safety is low.

[0005] Chinese Patent No. 200420022752.X discloses an air outlet valve for ignition guns and lighters, the structure of which is as follows: Figure 5-6As shown in the figure, the outlet valve includes a valve needle, a sealing ring, a compression spring, a valve body, a base and a T-shaped rubber plug. A guide angle step is provided on the inner wall of the valve body. The valve needle is in the valve body. A groove is provided on the valve needle. The O-type sealing ring is located in the groove. The compression spring is sleeved on the valve needle. When the valve needle rises, the guide angle step on the inner wall of the valve body squeezes and deforms the O-type sealing ring, and the O-type sealing ring moves up and seals with the inner wall of the valve body. The disadvantages of this structure are: each time the air is discharged, the entire circle of the O-type sealing ring must slide over the guide angle step, the deformation is large, the sealing ring is obviously damaged, there is a large sense of frustration when the valve needle moves upward, and the air discharge is often too fast or too slow. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide an ignition device outlet valve which can be extinguished within 3 seconds after ignition is completed, so that the outlet operation is smooth, the outlet flow is stable, and the damage to the O-ring is minimized.

[0007] To achieve the above object, the present invention adopts the following technical solution: an ignition device gas outlet valve comprises a valve seat, a valve needle mounted on the valve seat and a valve body, wherein the valve body is sleeved on the valve needle;

[0008] The outer wall of the valve needle is provided with a circle of grooves, in which an O-ring is placed; the inner wall of the lower middle part of the valve body is provided with at least one air release groove;

[0009] The inner cavity of the valve needle forms an axially arranged air outlet channel, and the valve needle is provided with at least one radially arranged air vent hole, which is located below the O-ring and communicates with the air outlet channel;

[0010] When the air outlet valve is opened, that is, the valve needle is in a pulled-up state, the O-ring is located above the air relief groove and the entire circle is sealed with the inner wall of the valve body, and the gas flows out from the valve seat along the air outlet channel from the upper end of the valve needle; the valve needle returns to a free state, and a residual air channel is formed between the air relief groove and the corresponding local O-ring, and the rest of the O-ring is still sealed with the inner wall of the valve body. The residual air in the valve needle uses the vent hole to flow through the residual air channel and is discharged from the gap between the upper part of the valve body and the outer wall of the valve needle.

[0011] After ignition is completed, the present invention can automatically discharge the residual gas, ensuring that the flame is extinguished within 3 seconds, eliminating the safety hazard caused by the residual fire. When the present invention is operated to discharge gas, it is only necessary to slide a part of the O-type sealing ring through the gas discharge groove to achieve sealing. The contact area between the O-type sealing ring and the gas discharge groove is small, the deformation is small, and the damage to the O-type sealing ring is small; due to the small deformation of the O-type sealing ring, the operating valve needle moves upward smoothly, and the gas discharge flow is stable.

[0012] As a supplement to the above technical solution, the inner wall of the valve body forms a circle of steps, and the O-type sealing ring is always matched with the vertical inner wall of the valve body located above the steps. Since the O-type sealing ring is always matched with the vertical inner wall of the valve body, the O-type sealing ring has less resistance and suffers less damage during the gas outlet operation.

[0013] As a supplement to the above technical solution, the bottom edge of the air relief groove is flush with the bottom surface of the step, which facilitates the processing of the valve body.

[0014] As a supplement to the above technical solution, the width of the air release groove is 0.3-1.5 mm (preferably 0.6-0.8 mm), which causes little damage to the O-ring without affecting air release.

[0015] As a supplement to the above technical solution, the groove is arranged on the outer wall of the middle part of the valve needle. From an overall consideration, this position is more suitable for arranging the groove.

[0016] As a supplement to the above technical solution, there are multiple air release grooves, preferably 2-4, which are distributed circumferentially.

[0017] As a supplement to the above technical solution, a T-shaped rubber plug is provided at the bottom of the valve needle, and an air inlet hole is opened at the bottom of the valve seat; when the valve needle returns to a free state, the T-shaped rubber plug covers the air inlet hole to prevent air from entering.

[0018] As a supplement to the above technical solution, an annular sealing ring is sleeved on the outer wall of the bottom of the valve seat, and the outer wall of the valve seat is sealed and connected with the wall of the oil groove by the annular sealing ring.

[0019] As a supplement to the above technical solution, the material of the valve body is plastic, and it is only necessary to process the air release groove during injection molding to facilitate the processing of the valve body; it can also be metal, such as zinc or aluminum.

[0020] As a supplement to the above technical solution, a compression spring located above the O-ring is sleeved on the valve needle in the valve body, and the compression spring is used to return the valve needle from the air outlet state to the free state.

[0021] The beneficial effects of the present invention are as follows: during the air outlet operation of the present invention, sealing can be achieved by only sliding a portion of the O-ring over the air outlet groove. The contact area between the O-ring and the air outlet groove is small, the deformation is small, and the damage to the O-ring is small. The operating valve needle moves upward smoothly, the air outlet flow is stable, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-2 This is a general structural diagram of the gas outlet valve of an ignition gun and a lighter ( Figure 1 In deflated state, Figure 2 is a free state);

[0023] Figure 3-4A schematic diagram of the structure of an existing outlet valve ( Figure 3 In deflated state, Figure 4 is a free state);

[0024] Figure 5-6 It is a structural schematic diagram of another existing outlet valve ( Figure 5 In deflated state, Figure 6 is a free state);

[0025] Figure 7-8 It is a structural schematic diagram of the present invention ( Figure 7 In deflated state, Figure 8 is a free state);

[0026] Fig. 9 It is a structural schematic diagram of the valve body of the present invention.

[0027] In the figure, 1-valve needle, 2-valve body, 3-compression spring, 4-O-ring, 5-valve seat, 6-T-type rubber plug, 7-annular sealing ring, 8-air relief groove, 9-air outlet channel, 10-vent hole, 11-step, 12-air inlet hole. DETAILED DESCRIPTION

[0028] In order to make the purpose and advantages of the invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] like Figure 7-8 The ignition device outlet valve shown includes a valve seat 5, a valve needle 1, a valve body 2, a compression spring 3, an O-type sealing ring 4 and a T-type rubber plug 6. The valve needle 1 and the valve body 2 are installed on the valve seat, and the valve body 2 is sleeved on the valve needle 1. An annular sealing ring 7 is sleeved on the outer wall at the bottom of the valve seat 5. The material of the valve body 2 is plastic, and the material of the valve needle is metal.

[0030] The outer wall of the middle part of the valve needle 1 is provided with a circle of grooves, which are used to place the O-ring 4; the valve needle in the valve body is covered with a compression spring 3 located above the O-ring 4. The inner wall of the middle and lower part of the valve body is provided with a venting groove 8, and the width of the venting groove 8 is 0.6-0.8mm. Fig. 9 shown.

[0031] The inner cavity of the valve needle 1 forms an axially arranged air outlet passage 9 , and the valve needle is provided with a radially arranged air vent 10 , which is located below the O-ring 4 and communicates with the air outlet passage 9 .

[0032] The inner wall of the valve body 1 forms a circle of steps 11, and the O-ring 4 is always matched with the vertical inner wall of the valve body located above the step 11. The bottom edge of the air release groove 8 is flush with the bottom surface of the step 11.

[0033] A T-shaped rubber plug 6 is provided at the bottom of the valve needle 1, and an air inlet hole 12 is provided at the bottom of the valve seat 5; when the valve needle 1 returns to a free state, the T-shaped rubber plug 6 covers the air inlet hole 12 to prevent air from entering.

[0034] When the outlet valve is opened, the valve needle is in the pulled-up state. Figure 7 As shown, the O-ring is located above the air relief groove and the entire circle is sealed with the inner wall of the valve body, and the gas flows out from the valve seat along the outlet channel from the upper end of the valve needle; the valve needle returns to a free state, as shown in FIG. Figure 8 As shown, a residual air channel is formed between the air relief groove and the corresponding local O-ring, and the rest of the O-ring is still sealed with the inner wall of the valve body. The residual air in the valve needle uses the vent hole to flow through the residual air channel and is discharged from the gap between the upper part of the valve body and the outer wall of the valve needle.

[0035] The above-mentioned embodiments only express the implementation methods of the present invention, and cannot be understood as limiting the scope of the invention patent, nor is it any form of limitation on the structure of the present invention. It should be pointed out that for ordinary technicians in this field, several changes and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An ignition device gas outlet valve, comprising a valve seat (5), a valve needle (1) mounted on the valve seat and a valve body (2), wherein the valve body (2) is sleeved on the valve needle (1), and is characterized in that: The outer wall of the valve needle (1) is provided with a circle of grooves, in which an O-type sealing ring (4) is placed; the inner wall of the lower middle part of the valve body is provided with at least one air release groove (8); The inner cavity of the valve needle (1) forms an axially arranged air outlet channel (9), and the valve needle is provided with at least one radially arranged air vent (10), the air vent (10) being located below the O-ring (4) and communicating with the air outlet channel (9); When the air outlet valve is opened, that is, the valve needle is in a pulled-up state, the O-ring is located above the air relief groove and the entire circle is sealed with the inner wall of the valve body, and the gas flows out from the valve seat along the air outlet channel from the upper end of the valve needle; the valve needle returns to a free state, and a residual air channel is formed between the air relief groove and the corresponding local O-ring, and the rest of the O-ring is still sealed with the inner wall of the valve body. The residual air in the valve needle uses the vent hole to flow through the residual air channel and is discharged from the gap between the upper part of the valve body and the outer wall of the valve needle; The inner wall of the valve body (1) forms a circle of steps (11), and the O-ring (4) always cooperates with the vertical inner wall of the valve body located above the step (11); the width of the air relief groove (8) is 0.3-1.5 mm, and there are multiple air relief grooves (8) distributed in a circumferential direction.

2. The ignition device gas outlet valve according to claim 1, characterized in that: The bottom edge of the air release groove (8) is flush with the bottom surface of the step (11).

3. The ignition device gas outlet valve according to claim 1, characterized in that: The groove is arranged on the outer side wall of the middle part of the valve needle (1).

4. The ignition device gas outlet valve according to claim 1, characterized in that: A T-shaped rubber plug (6) is provided at the bottom of the valve needle (1), and an air inlet hole (12) is provided at the bottom of the valve seat (5); when the valve needle (1) returns to a free state, the T-shaped rubber plug (6) covers the air inlet hole (12) to prevent air from entering.

5. The ignition device gas outlet valve according to claim 1 or 2, characterized in that: An annular sealing ring (7) is sleeved on the outer wall of the bottom of the valve seat (5).

6. The ignition device gas outlet valve according to claim 1 or 2, characterized in that: The material of the valve body (2) is plastic.

7. The ignition device gas outlet valve according to claim 1 or 2, characterized in that: A compression spring (3) located above an O-type sealing ring (4) is sleeved on the valve needle located in the valve body.

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