Anti-backfire three-pipe injection type cutting torch

Abstract

The utility model discloses an anti-backfire three-pipe injection type cutting torch, and belongs to the technical field of welding tools. The rear connecting body comprises an oxygen connector and a fuel gas connector; the cutting torch and the oxygen connector can be communicated with the cutting torch through a cutting oxygen pipe and an oxygen pipe respectively, the gas connector is communicated with the cutting torch through a gas pipe, fire stopping pipes and fire arresting valves are arranged in the oxygen connector and the gas connector, the fire stopping pipes are located on the front sides of the fire arresting valves, the fire stopping pipes are used for resisting tempering, and the fire arresting valves are used for preventing gas backflow. Gas can pass through the fire stopping pipe, but the fire stopping pipe can stop flames, so that the flames can be quickly prevented from flowing back to a gas supply system when backfire occurs, and the backfire phenomenon is resisted; the safety guarantee is further increased through the fire-retardant valve, the gas can be prevented from reversely flowing backwards from the cutting torch under any condition, it is ensured that the gas flow direction can be cut off even under the abnormal condition, and potential risks are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding tools, and in particular relates to an anti-backfire three-tube shooting and suction cutting torch. Background Art

[0002] The cutting torch is a common metal cutting tool. Currently, the suction welding cutting torch is mostly composed of a cutting torch front part, a cutting torch middle part, a cutting torch rear part and related components. The parts are welded by gas pipes, and there is no anti-flashback device. In addition, the structure of long-distance transmission of oxygen and fuel gas after mixing is usually adopted. Generally, after the cutting is completed and the fire is turned off, there is no protective measure, which makes it easy for sparks to enter the oxygen cylinder or acetylene cylinder through the pipeline, causing the gas cylinder to explode, thereby causing personal injury. It has the disadvantages of easy flashback and low safety. Utility Model Content

[0003] The utility model aims at the above problems existing in the prior art and proposes an anti-backfire three-tube jet-suction cutting torch.

[0004] The utility model can be realized through the following technical solutions:

[0005] A flashback-proof three-tube suction-shooting cutting torch, comprising:

[0006] The rear connector includes an oxygen connector and a gas connector;

[0007] The oxygen connector can be connected to the cutting nozzle through the cutting oxygen tube and the oxygen tube respectively, and the gas connector is connected to the cutting nozzle through the gas pipe, wherein:

[0008] A fire stop pipe and a fire stop valve are provided in both the oxygen joint and the gas joint. The fire stop pipe is located in front of the fire stop valve. The fire stop pipe is used to resist backfire, and the fire stop valve is used to prevent gas backflow.

[0009] As a further improvement of the present invention, the gas connector has the same structure as the oxygen connector, with its front end being an air inlet cavity and its rear end being a connector part with a threaded rear sleeve screwed thereon. The fire stop pipe is installed in the air inlet cavity, and the fire stop valve is installed in the inner cavity of the connector part and close to the threaded rear sleeve.

[0010] As a further improvement of the utility model, the fire damper comprises:

[0011] The first mounting part and the second mounting part are buckled with each other and sealedly connected through a sealing member, and the second mounting part is also buckled with the joint part;

[0012] A movable plate installed in the inner cavity of the first installation portion;

[0013] The spring has two ends respectively abutting against the first mounting portion and the moving plate.

[0014] As a further improvement of the present invention, an air intake notch is provided on the inner wall of the first mounting portion, and when the movable plate is not pushed by gas, the spring force of the spring pushes the movable plate to move backward until it abuts against the sealing member, and at this time, the gas cannot pass through the movable plate.

[0015] As a further improvement of the utility model, when the oxygen connector or the gas connector is taking in air, the gas pushes the movable plate forward and compresses the spring. At this time, the movable plate moves to the position of the air intake notch, and the gas passes through the air intake notch and enters the air intake cavity along the central through hole of the first mounting part.

[0016] As a further improvement of the utility model, the rear connecting body is provided with a cavity for connecting the oxygen connector and the cutting oxygen tube, and a cutting oxygen quick wind structure is installed in the cavity.

[0017] As a further improvement of the utility model, the cutting oxygen fast wind structure includes:

[0018] A fast wind body, the insertion end of which has a fast wind head, the fast wind head is used to open or close the communication port between the cavity and the cutting oxygen tube;

[0019] A push rod, which is arranged at the outer end of the quick wind body, and the push rod is connected to a quick wind handle, and the communication port between the cavity and the cutting oxygen tube is opened by pressing the quick wind handle;

[0020] A return spring structure is arranged in the fast wind main body. When the push rod is not subjected to external force, the return spring structure pulls down the fast wind main body structure and enables the fast wind head to close the communication port between the cavity and the cutting oxygen tube.

[0021] As a further improvement of the utility model, an oxygen handwheel valve is also installed on the side of the fast wind structure, and the oxygen handwheel valve is used to open or close the communication channel between the oxygen connector and the oxygen tube;

[0022] When the oxygen hand wheel valve is closed, the communication channel is closed;

[0023] When the oxygen hand wheel valve is opened, the communication channel is opened, and the oxygen in the oxygen connector can enter the oxygen pipe through the communication channel.

[0024] As a further improvement of the present invention, a mixer is installed at one end of the oxygen tube located in the cutting nozzle, and a gas channel is opened between one end of the gas tube located in the cutting nozzle and the oxygen tube, and the gas enters the mixer through the gas channel to mix with the oxygen.

[0025] As a further improvement of the utility model, the cutting nozzle is provided with a cutting oxygen channel and a mixed gas channel, the cutting oxygen channel is communicated with the cutting oxygen tube, and the mixed gas channel is communicated with the mixer.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] 1. Both the oxygen joint and the gas joint are equipped with a fire stop tube, which allows gas to pass through but can block the flame. Therefore, when a flashback occurs, it can quickly prevent the flame from flowing back to the gas supply system, thereby resisting the flashback phenomenon;

[0028] 2. Both the oxygen joint and the gas joint are equipped with a flame arrester, which further increases safety. It can prevent the gas from flowing backward from the cutting nozzle under any circumstances, ensuring that the gas flow can be cut off even in abnormal circumstances to avoid potential dangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the anti-backfire three-tube suction-shooting cutting torch of the utility model;

[0030] Figure 2 The utility model Figure 1 A partial enlarged view of point C in the middle;

[0031] Figure 3 The utility model Figure 1 Section view along AA;

[0032] Figure 4 The utility model Figure 1 Section view along BB.

[0033] In the figure, 100, the rear connection body;

[0034] 110, oxygen connector; 111, cutting oxygen tube; 112, oxygen tube; 1121, mixer;

[0035] 120, gas connector; 121, gas pipe; 1211, gas channel; 122, gas handwheel valve;

[0036] 130. Fire stop tube;

[0037] 140, flame arrester; 141, first mounting portion; 142, second mounting portion; 143, sealing member; 144, movable plate; 145, spring; 150, air inlet cavity; 160, threaded rear sleeve;

[0038] 200, cutting nozzle; 210, cutting oxygen channel; 220, mixed gas channel;

[0039] 300. Cutting oxygen fast air structure; 310. Fast air body; 320. Fast air head; 330. Push rod; 340. Fast air handle; 350. Reset spring structure; 360. Oxygen hand wheel valve; 361. Connecting channel. DETAILED DESCRIPTION

[0040] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0041] like Figure 1-4 As shown, the utility model provides an anti-flashback three-tube suction-injection cutting torch, comprising:

[0042] The rear connection body 100 includes an oxygen connector 110 and a gas connector 120, which respectively correspond to the access of oxygen and gas (such as acetylene);

[0043] The cutting nozzle 200, the oxygen connector 110 can be connected to the cutting nozzle 200 through the cutting oxygen tube 111 and the oxygen tube 112 respectively, and the gas connector 120 is connected to the cutting nozzle 200 through the gas tube 121, wherein,

[0044] A fire stop pipe 130 and a fire arrester 140 are both provided in the oxygen connector 110 and the gas connector 120. The fire stop pipe 130 is located in front of the fire arrester 140. The fire stop pipe 130 allows gas to pass through, but can block the flame. Therefore, when a backfire occurs, the flame can be quickly prevented from flowing back to the gas supply system, thereby resisting the backfire phenomenon. The fire arrester 140 further increases safety protection. It can prevent the gas from flowing backward from the cutting nozzle 200 under any circumstances, ensuring that the gas flow can be cut off even in abnormal circumstances to avoid potential dangers.

[0045] Preferably, the gas connector 120 has the same structure as the oxygen connector 110, with the front end thereof being the air inlet cavity 150, and the rear end thereof being the connector portion and being screwed with a threaded rear sleeve 160, and the fire stop tube 130 being installed in the air inlet cavity 150, and its position design is conducive to blocking possible flashback in the first place, and using a physical barrier to prevent the flame from returning to the gas supply line;

[0046] The flame arrester 140 is installed in the inner cavity of the joint part and is close to the threaded rear sleeve 160. When the gas flows through here, once an abnormal backflow occurs, the flame arrester 140 will immediately respond and close, effectively preventing safety problems caused by gas backflow.

[0047] Preferably, the flame arrester 140 comprises:

[0048] The first mounting portion 141 and the second mounting portion 142 are buckled with each other and sealed by a sealing member 143, and the second mounting portion 142 is also buckled with the joint portion;

[0049] A movable plate 144, which is installed in the inner cavity of the first installation portion 141;

[0050] The spring 145 has two ends that abut against the first mounting portion 141 and the moving plate 144 respectively.

[0051] The inner wall of the first mounting portion 141 is provided with an air inlet notch (not shown in the figure). When the movable plate 144 is not pushed by the gas, the spring 145 force of the spring 145 pushes the movable plate 144 to move backward until it contacts the sealing member 143. At this time, the gas cannot pass through the movable plate 144.

[0052] When oxygen and fuel gas are introduced, the gas pressure overcomes the force of the spring 145 to push the movable plate 144 forward, compressing the spring 145, and the movable plate 144 moves away from its original position. At this time, the air intake gap is opened, and the gas can pass through the gap and enter the air intake cavity 150 along the central through hole of the first mounting portion 141, completing the normal air supply function;

[0053] On the contrary, once gas refluxes, the reflux gas impacts the movable plate 144 to make it move backward and cling to the seal 143 again. Due to the combined effect of the spring 145 force and the reflux gas pressure, a tight seal is formed between the movable plate 144 and the seal 143, effectively preventing gas reflux and achieving the anti-backfire function.

[0054] Preferably, the rear connecting body 100 is provided with a cavity for connecting the oxygen connector 110 and the cutting oxygen tube 111, and the cutting oxygen quick wind structure 300 is installed in the cavity.

[0055] Preferably, the cutting oxygen fast wind structure 300 comprises:

[0056] The fast wind body 310 has a fast wind head 320 at its insertion end, and the fast wind head 320 is used to open or close the communication port between the cavity and the cutting oxygen tube 111;

[0057] A push rod 330 is arranged at the outer end of the fast wind body 310. The push rod 330 is connected to a fast wind handle 340. The fast wind handle 340 is pressed to open the communication port between the cavity and the cutting oxygen tube 111. The push rod 330 can be driven to move by manually pressing the fast wind handle 340, so that the fast wind head 320 opens the channel between the cavity and the cutting oxygen tube 111, allowing the cutting oxygen to flow in.

[0058] The return spring structure 350 is arranged in the fast wind body 310 and embedded in the fast wind body 310. When there is no external force acting on the top rod 330, the return spring 145 will automatically pop up, prompting the fast wind body 310 and the fast wind head 320 thereon to move downward, thereby closing the connecting port between the cavity and the cutting oxygen tube 111, ensuring that oxygen will not leak in the non-working state.

[0059] Therefore, by simply and conveniently operating the quick wind handle 340, the cutting oxygen can be easily connected and disconnected quickly, which greatly improves the work efficiency and operation safety. When the cutting oxygen quick wind structure 300 is opened, the cutting oxygen can smoothly enter the cutting oxygen tube 111 and finally reach the cutting nozzle 200 to provide the necessary oxygen support for the cutting operation.

[0060] Preferably, an oxygen hand wheel valve 360 ​​is also installed on the side of the cutting oxygen fast wind structure 300, and the oxygen hand wheel valve 360 ​​is used to open or close the communication channel 361 between the oxygen connector 110 and the oxygen tube 112. Specifically:

[0061] When the oxygen hand wheel valve 360 ​​is closed, the communication channel 361 is closed, and when the oxygen hand wheel valve 360 ​​is opened, the communication channel 361 is opened. At this time, the oxygen in the oxygen connector 110 can enter the oxygen pipe through the communication channel 361.

[0062] At the same time, the gas connector 120 also has a gas hand wheel valve 122 for opening or closing the gas entering the gas pipe 121 .

[0063] Preferably, a mixer 1121 is installed at one end of the oxygen tube 112 located in the cutting nozzle 200, and a gas channel 1211 is opened between one end of the gas tube 121 located in the cutting nozzle 200 and the oxygen tube 112. The gas enters the mixer 1121 through the gas channel and mixes with the oxygen, which helps to produce an ideal combustion flame temperature and shape, thereby ensuring that the cutting process is efficient, controllable and safe.

[0064] Preferably, the cutting nozzle 200 is provided with a cutting oxygen channel 210 and a mixed gas channel 220, the cutting oxygen channel 210 is connected to the cutting oxygen pipe 111, and the mixed gas channel 220 is connected to the mixer 1121, wherein:

[0065] The accurate proportion and mixing of fuel gas and oxygen are completed in advance in the mixer 1121, and the mixed gas then flows to a specific area of ​​the cutting nozzle 200 through the mixed gas channel 220. The gas here is usually used to preheat the workpiece, and can also be adjusted to a mixed fire suitable for cutting as needed;

[0066] When the cutting oxygen quick wind structure 300 is opened, the high-pressure cutting oxygen will directly reach the air outlet of the cutting nozzle 200 through the cutting oxygen channel 210, and act on the material to be cut in a high-speed jet manner, thereby achieving an efficient cutting effect.

[0067] The technical means disclosed in the scheme of the utility model are not limited to the technical means disclosed by the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific implementation method of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

[0068] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0069] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A flashback-proof three-tube suction-injection cutting torch, characterized in that: include: The rear connector includes an oxygen connector and a gas connector; The oxygen connector can be connected to the cutting nozzle through the cutting oxygen tube and the oxygen tube respectively, and the gas connector is connected to the cutting nozzle through the gas pipe, wherein: A fire stop pipe and a fire stop valve are provided in both the oxygen joint and the gas joint. The fire stop pipe is located in front of the fire stop valve. The fire stop pipe is used to resist backfire, and the fire stop valve is used to prevent gas backflow.

2. The anti-flashback three-tube suction-injection cutting torch according to claim 1, characterized in that: The gas connector has the same structure as the oxygen connector, with its front end being an air inlet cavity and its rear end being a connector portion with a threaded rear sleeve screwed thereon. The fire stop pipe is installed in the air inlet cavity, and the fire arrester is installed in the inner cavity of the connector portion and close to the threaded rear sleeve.

3. The anti-flashback three-tube suction-injection cutting torch according to claim 2, characterized in that: The fire damper comprises: The first mounting part and the second mounting part are buckled with each other and sealedly connected through a sealing member, and the second mounting part is also buckled with the joint part; A movable plate installed in the inner cavity of the first installation portion; The spring has two ends respectively abutting against the first mounting portion and the moving plate.

4. The anti-flashback three-tube suction-injection cutting torch according to claim 3, characterized in that: An air inlet notch is provided on the inner wall of the first mounting portion. When the movable plate is not pushed by gas, the spring force of the spring pushes the movable plate to move backward until it abuts against the sealing member, and at this time, gas cannot pass through the movable plate.

5. The anti-flashback three-tube suction-injection cutting torch according to claim 4, characterized in that: When the oxygen connector or the gas connector is taking in air, the gas pushes the movable plate forward and compresses the spring. At this time, the movable plate moves to the position of the air intake notch, and the gas passes through the air intake notch and enters the air intake cavity along the central through hole of the first mounting portion.

6. The anti-flashback three-tube suction-injection cutting torch according to claim 1, characterized in that: The rear connecting body is provided with a cavity for connecting the oxygen connector and the cutting oxygen tube, and a cutting oxygen quick wind structure is installed in the cavity.

7. The anti-flashback three-tube suction-injection cutting torch according to claim 6, characterized in that: The cutting oxygen fast wind structure comprises: A fast wind body, the insertion end of which has a fast wind head, the fast wind head is used to open or close the communication port between the cavity and the cutting oxygen tube; A push rod, which is arranged at the outer end of the quick wind body, and the push rod is connected to a quick wind handle, and the communication port between the cavity and the cutting oxygen tube is opened by pressing the quick wind handle; A return spring structure is arranged in the fast wind body. When the push rod is not subjected to external force, the return spring structure pulls down the fast wind body and enables the fast wind head to close the communication port between the cavity and the cutting oxygen tube.

8. The anti-flashback three-tube suction-injection cutting torch according to claim 7, characterized in that: An oxygen handwheel valve is also installed on the side of the fast wind structure, and the oxygen handwheel valve is used to open or close the communication channel between the oxygen connector and the oxygen tube; When the oxygen hand wheel valve is closed, the communication channel is closed; When the oxygen hand wheel valve is opened, the communication channel is opened, and the oxygen in the oxygen connector can enter the oxygen pipe through the communication channel.

9. The anti-flashback three-tube suction-injection cutting torch according to claim 1, characterized in that: A mixer is installed at one end of the oxygen pipe located in the cutting nozzle, and a gas channel is opened between one end of the gas pipe located in the cutting nozzle and the oxygen pipe, and the gas enters the mixer through the gas channel to mix with the oxygen.

10. The anti-flashback three-tube suction-injection cutting torch according to claim 9, characterized in that: The cutting nozzle is provided with a cutting oxygen channel and a mixed gas channel, the cutting oxygen channel is communicated with the cutting oxygen pipe, and the mixed gas channel is communicated with the mixer.

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