Anti-backfire cutting gun and cutting torch thereof

Abstract

The utility model discloses an anti-backfire cutting gun and a cutting torch thereof, and relates to the technical field of cutting torches, the cutting gun comprises a handle, a gas connecting assembly, a middle main body, a cutting oxygen pipe, a hydrogen outlet pipe, a preheating oxygen pipe, a cutting torch joint and a cutting torch, the gas connecting assembly is manually connected into a gas source, the handle is held, a hydrogen valve in the gas connecting assembly is opened firstly, and then the cutting torch joint is opened; hydrogen enters the cutting torch from the hydrogen outlet pipe, then the preheating oxygen valve in the middle main body is opened, oxygen enters the cutting torch from the preheating oxygen pipe, and the hydrogen and the oxygen are respectively fed, so that burning loss of the cutting torch caused by mutual blow-by during tempering, manual ignition of a mixture of the oxygen and the hydrogen, generation of preheating flame and heating of a metal surface to an ignition point can be prevented; during cutting, the cutting oxygen valve in the middle main body is manually opened, high-pressure pure oxygen enters the cutting nozzle from the cutting oxygen pipe and is jetted to a cut workpiece from the cutting nozzle, metal is combusted in oxygen jet flow, slag generated by combustion is blown away through the oxygen jet flow, and a cutting seam is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting gun technical field, concretely is a kind of cutting gun and cutting torch of anti-backfire. BACKGROUND

[0002] Cutting gun is the core tool of gas cutting equipment, and its background technology evolves continuously with the development of metal processing technology.The main function of cutting gun is to mix oxygen and fuel gas in a certain proportion, form high-temperature flame through nozzle, cut or process metal, develop clean energy, replace petrochemical fuel with hydrogen energy, since the burning temperature of hydrogen and oxygen is 3200 ℃, and the burning speed of hydrogen is 2900 m / s, when cutting super-thick billet, since cutting molten pool is turned over, or hydrogen flow fluctuates, backfire phenomenon is prone to occur, causing cutting torch, cutting gun and pipeline to be burnt, affecting cutting production, which is a problem that is more concentrated and difficult to solve in current cutting operation. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of cutting gun and cutting torch of anti-backfire to solve the problems in prior art.

[0004] To achieve the above object, the utility model provides the following technical scheme: the cutting gun includes handle, one end of the handle is equipped with gas connection component, the other end of the handle is equipped with middle main body, one end of the middle main body is equipped with cutting oxygen pipe, hydrogen outlet pipe and preheating oxygen pipe, one end of the cutting oxygen pipe, hydrogen outlet pipe and preheating oxygen pipe is equipped with cutting torch joint, one end of the cutting torch joint is equipped with cutting torch.In use, manually connect gas connection component to gas source, hold handle, open hydrogen valve first, hydrogen enters cutting torch from hydrogen outlet pipe, then open preheating oxygen valve, oxygen enters cutting torch from preheating oxygen pipe, manually ignite the mixture of oxygen and hydrogen, produce preheating flame, heat metal surface to ignition point, manually open cutting oxygen valve, high-pressure pure oxygen enters cutting torch from cutting oxygen pipe, and is sprayed from cutting torch to the workpiece being cut, so that metal burns in oxygen jet, and the molten slag generated by combustion is blown away by oxygen jet, forming a cutting gap.

[0005] The gas connection component includes first connecting pipe, second connecting pipe, the first connecting pipe and the second connecting pipe are installed at one end of the handle, one end of the first connecting pipe is equipped with oxygen pipe, oxygen nut is installed between the first connecting pipe and the oxygen pipe, one end of the second connecting pipe is equipped with hydrogen inlet pipe, hydrogen nut is installed between the second connecting pipe and the hydrogen inlet pipe, hydrogen valve is installed on the second connecting pipe, the cutting oxygen pipe and the preheating oxygen pipe are communicated with the oxygen pipe, and the hydrogen outlet pipe is communicated with the hydrogen inlet pipe.

[0006] The middle body comprises a valve body, one end of the cutting oxygen pipe, the hydrogen outlet pipe and the preheating oxygen pipe is installed on the valve body, a cutting oxygen valve is installed above the valve body, and a preheating oxygen valve is installed at one end of the valve body.

[0007] A cutting nozzle is applied to an anti-backfire cutting gun, the cutting nozzle comprises a cutting nozzle shell, the cutting nozzle shell is installed at one end of a cutting nozzle connector, a sealing ring is arranged on the outer surface of the cutting nozzle shell, and a main cutting oxygen cavity, a hydrogen cavity and a mixed gas cavity are sequentially arranged in the cutting nozzle shell from inside to outside.

[0008] The hydrogen cavity comprises a hydrogen inlet cavity and a hydrogen outlet cavity, one end of the hydrogen inlet cavity is communicated with the hydrogen outlet pipe, the other end of the hydrogen inlet cavity is communicated with the hydrogen outlet cavity, and the hydrogen outlet cavity is arranged between the diffusion section and the mixed gas cavity.

[0009] The mixed gas cavity comprises a hydrogen inlet cavity, one end of the hydrogen inlet cavity is communicated with the hydrogen outlet pipe, the other end of the hydrogen inlet cavity is provided with a mixed gas outlet cavity, the mixed gas outlet cavity is located outside the hydrogen outlet cavity, the other side of the mixed gas outlet cavity is provided with an oxygen inlet cavity, and one end of the oxygen inlet cavity is communicated with the preheating oxygen pipe.

[0010] The sealing angle of the sealing ring is 30°5'1.8''.

[0011] The hydrogen outlet cavity and the mixed gas outlet cavity are arranged in a triangular shape.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1、 the utility model discloses a double outlet gas hole, and the hydrogen and oxygen in the outer ring are mixed, the preheating intensity of the flame is enhanced, the mixing ratio of the hydrogen and oxygen mixed gas is 1:0.9, the angle between the gas hole and the billet is 1 ° 30', the preheating flame is more concentrated, the preheating flame is more powerful, the cutting combustion temperature is improved, the billet temperature is rapidly increased, and the cutting speed is obviously accelerated.

[0014] 2, the high pressure oxygen and hydrogen generated by the included angle of 2 ° of the oxygen and hydrogen mixing chamber in the cutting nozzle form a pressure difference, thereby forming a suction force, can make the combustion gas fully mixed, all the gas outlets are arranged in a triangular shape, can block the influence of atmospheric gas on the cutting oxygen purity when hydrogen burns, can protect the purity of oxygen, improve the combustion efficiency of the main cutting oxygen, at the same time, increase a way of hydrogen beside the main cutting oxygen, expand the flow of hydrogen, reduce the probability of tempering;

[0015] 3, the cutting nozzle of the utility model adopts three step surface seals, and the sealing angle of each seal is 30 ° 5'1.8 ", so that hydrogen assists oxygen main cutting, hydrogen and oxygen gas separately, which can prevent mutual gas leakage during tempering and cause burning loss of the cutting nozzle;

[0016] 4, the main cutting oxygen cavity of the utility model adopts a combined step form, after the high pressure gas passes through the compression section and the diffusion section, the flow rate of the gas is accelerated to 2 Mach, the cutting speed is improved, the cutting section is flat, and there is no slag. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the cutting gun and the cutting nozzle of the utility model;

[0018] Figure 2 It is a perspective view of the gas connecting assembly of the utility model;

[0019] Figure 3 It is a perspective view of the middle body of the utility model;

[0020] Figure 4 It is a perspective view of the cutting nozzle of the utility model;

[0021] Figure 5 It is a bottom view of the cutting nozzle of the utility model;

[0022] Figure 6 It is a sectional view of the cutting nozzle of the utility model Figure 1 ;

[0023] Figure 7 It is a sectional view of the cutting nozzle of the utility model Figure 2 .

[0024] In the diagram: 1. Handle; 2. Gas connection assembly; 21. Oxygen pipe; 22. Oxygen nut; 23. Hydrogen inlet pipe; 24. Hydrogen nut; 25. Hydrogen valve; 26. First connecting pipe; 27. Second connecting pipe; 3. Central main body; 31. Valve body; 32. Cutting oxygen valve; 33. Preheating oxygen valve; 4. Cutting oxygen pipe; 5. Hydrogen outlet pipe; 6. Preheating oxygen pipe; 7. Cutting nozzle connector; 8. Cutting nozzle; 81. Cutting nozzle shell; 82. Main cutting oxygen chamber; 821. Compression section; 822. Diffusion section; 83. Hydrogen chamber; 831. Hydrogen outlet chamber; 832. Hydrogen inlet chamber; 84. Mixing chamber; 841. Mixing outlet chamber; 842. Hydrogen inlet chamber; 843. Oxygen inlet chamber; 85. Sealing ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example: Figures 1-7 As shown, this utility model provides a technical solution for a cutting gun, which includes a handle 1. A gas receiving component 2 is installed at one end of the handle 1, and a central body 3 is installed at the other end. A cutting oxygen pipe 4, a hydrogen outlet pipe 5, and a preheating oxygen pipe 6 are installed at one end of the central body 3. A cutting nozzle connector 7 is installed at one end of each of the cutting oxygen pipe 4, hydrogen outlet pipe 5, and preheating oxygen pipe 6, and a cutting nozzle 8 is installed at one end of the cutting nozzle connector 7. In use, the gas receiving component 2 is manually connected to the gas source. Holding the handle 1, the hydrogen valve 25 is opened, allowing hydrogen to enter the cutting nozzle 8 from the hydrogen outlet pipe 5. Then, the preheating oxygen valve 33 is opened, allowing oxygen to enter the cutting nozzle 8 from the preheating oxygen pipe 6. The mixture of oxygen and hydrogen is manually ignited to generate a preheating flame, heating the metal surface to its ignition point. The cutting oxygen valve 32 is then manually opened, allowing high-pressure pure oxygen to enter the cutting nozzle 8 from the cutting oxygen pipe 4 and be sprayed onto the workpiece being cut. This causes the metal to burn in the oxygen jet, and the molten slag generated by the combustion is blown away by the oxygen jet, forming a kerf.

[0027] The gas receiving assembly 2 includes a first connecting pipe 26 and a second connecting pipe 27. The first connecting pipe 26 and the second connecting pipe 27 are installed at one end of the handle 1. An oxygen pipe 21 is installed at one end of the first connecting pipe 26. An oxygen nut 22 is installed between the first connecting pipe 26 and the oxygen pipe 21. A hydrogen inlet pipe 23 is installed at one end of the second connecting pipe 27. A hydrogen nut 24 is installed between the second connecting pipe 27 and the hydrogen inlet pipe 23. A hydrogen valve 25 is installed on the second connecting pipe 27. The cutting oxygen pipe 4 and the preheating oxygen pipe 6 are connected to the oxygen pipe 21. The hydrogen outlet pipe 5 is connected to the hydrogen inlet pipe 23.

[0028] The middle body 3 comprises a valve body 31, one end of the cutting oxygen pipe 4, the hydrogen outlet pipe 5 and the preheating oxygen pipe 6 being installed on the valve body 31, a cutting oxygen valve 32 being installed above the valve body 31, and a preheating oxygen valve 33 being installed at one end of the valve body 31.

[0029] The cutting nozzle 8 comprises a cutting nozzle shell 81, which is installed at one end of the cutting nozzle joint 7, and a sealing ring 85 is arranged on the outer surface of the cutting nozzle shell 81, the sealing angle of the sealing ring 85 is 30° 5' 1.8'', and a main cutting oxygen cavity 82, a hydrogen cavity 83 and a mixed gas cavity 84 are sequentially arranged in the cutting nozzle shell 81 from inside to outside, the main cutting oxygen cavity 82 comprises a compression section 821 and a diffusion section 822, the diffusion section 822 is installed below the compression section 821, and the compression section 821 is communicated with the cutting oxygen pipe 4.

[0030] The hydrogen cavity 83 comprises an inlet hydrogen cavity 832 and an outlet hydrogen cavity 831, one end of the inlet hydrogen cavity 832 is communicated with the hydrogen outlet pipe 5, the other end of the inlet hydrogen cavity 832 is communicated with the outlet hydrogen cavity 831, and the outlet hydrogen cavity 831 is arranged between the diffusion section 822 and the mixed gas cavity 84.

[0031] The mixed gas cavity 84 comprises a hydrogen inlet cavity 842, one end of the hydrogen inlet cavity 842 is communicated with the hydrogen outlet pipe 5, the other end of the hydrogen inlet cavity 842 is provided with a mixed gas outlet cavity 841, the mixed gas outlet cavity 841 is located outside the outlet hydrogen cavity 831, the other side of the mixed gas outlet cavity 841 is provided with an oxygen inlet cavity 843, one end of the oxygen inlet cavity 843 is communicated with the preheating oxygen pipe 6, and the outlet hydrogen cavity 831 and the mixed gas outlet cavity 841 are arranged in a triangular shape.

[0032] The working principle of the utility model is as follows:

[0033] In use, the artificial oxygen pipe 21 and hydrogen inlet pipe 23 are connected to the gas source respectively, holding the handle 1, first open hydrogen valve 25, hydrogen from hydrogen inlet pipe 23 into the hydrogen outlet pipe 5, from the hydrogen outlet pipe 5 into the hydrogen cavity 832 and hydrogen inlet cavity 842, then open preheating oxygen valve 33, oxygen from oxygen pipe 21 into the preheating oxygen pipe 6, from the preheating oxygen pipe 6 into the oxygen inlet cavity 843, artificial ignition of the mixture of oxygen and hydrogen, produce preheating flame, turn the preheating oxygen valve 33 to adjust the flame, when adjusted to neutral flame, the cutting nozzle 8 is aimed at the metal surface to be cut part.

[0034] When the metal surface is preheated to dark red, the artificial cutting oxygen valve 32 is opened, high pressure pure oxygen from the oxygen pipe 21 into the cutting oxygen pipe 4, from the cutting oxygen pipe 4 into the compression section 821, when the high pressure pure oxygen flows through the compression section 821, because the cross section of the nozzle is gradually reduced, the airflow is gradually accelerated, through the diffusion section 822 to the outlet, during the process, because the cross section of the nozzle of the diffusion section 822 is continuously expanded, the airflow expands, its pressure drops, and the flow rate continues to increase to 2 Mach, from the diffusion section 822 to the cutting workpiece, so that the metal burns in the oxygen jet, and the molten slag generated by combustion is blown away by the oxygen jet, forming a cutting seam, after use, first close the hydrogen valve 25, then close the cutting oxygen valve 32, and finally close the preheating oxygen valve 33.

[0035] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A flashback resistant cutting torch, characterized by: The cutting gun comprises a handle (1), one end of the handle (1) is provided with a gas connection assembly (2), the other end of the handle (1) is provided with a middle body (3), one end of the middle body (3) is provided with a cutting oxygen pipe (4), a hydrogen outlet pipe (5) and a preheating oxygen pipe (6), one end of the cutting oxygen pipe (4), the hydrogen outlet pipe (5) and the preheating oxygen pipe (6) is provided with a cutting nozzle connector (7), one end of the cutting nozzle connector (7) is provided with a cutting nozzle (8); The cutting nozzle (8) comprises a cutting nozzle shell (81), the inside of the cutting nozzle shell (81) is sequentially provided with a main cutting oxygen cavity (82), a hydrogen cavity (83) and a mixed gas cavity (84) from inside to outside; The hydrogen cavity (83) comprises a hydrogen inlet cavity (832) and a hydrogen outlet cavity (831), one end of the hydrogen inlet cavity (832) is communicated with the hydrogen outlet pipe (5), the other end of the hydrogen inlet cavity (832) is communicated with the hydrogen outlet cavity (831), and the hydrogen outlet cavity (831) is arranged between the diffusion section (822) and the mixed gas cavity (84); The mixed gas cavity (84) comprises a hydrogen inlet cavity (842), one end of the hydrogen inlet cavity (842) is communicated with the hydrogen outlet pipe (5), the other end of the hydrogen inlet cavity (842) is provided with a mixed gas outlet cavity (841), the mixed gas outlet cavity (841) is located outside the hydrogen outlet cavity (831), the other side of the mixed gas outlet cavity (841) is provided with an oxygen inlet cavity (843), and one end of the oxygen inlet cavity (843) is communicated with the preheating oxygen pipe (6); The hydrogen outlet cavity (831) and the mixed gas outlet cavity (841) are arranged in a triangular shape.

2. A flashback resistant cutting torch as defined in claim 1, wherein: The gas connection assembly (2) comprises a first connecting pipe (26) and a second connecting pipe (27), the first connecting pipe (26) and the second connecting pipe (27) are arranged at one end of the handle (1), one end of the first connecting pipe (26) is provided with an oxygen pipe (21), an oxygen nut (22) is arranged between the first connecting pipe (26) and the oxygen pipe (21), one end of the second connecting pipe (27) is provided with a hydrogen inlet pipe (23), a hydrogen nut (24) is arranged between the second connecting pipe (27) and the hydrogen inlet pipe (23), a hydrogen valve (25) is arranged on the second connecting pipe (27), the cutting oxygen pipe (4) and the preheating oxygen pipe (6) are communicated with the oxygen pipe (21), and the hydrogen outlet pipe (5) is communicated with the hydrogen inlet pipe (23).

3. A flashback resistant cutting torch as defined in claim 2, wherein: The middle body (3) comprises a valve body (31), one end of the cutting oxygen pipe (4), the hydrogen outlet pipe (5) and the preheating oxygen pipe (6) is arranged on the valve body (31), a cutting oxygen valve (32) is arranged above the valve body (31), and a preheating oxygen valve (33) is arranged at one end of the valve body (31).

4. A cutting tip characterized by: The application relates to a non-backfire cutting gun as claimed in claim 1, wherein the cutting nozzle shell (81) is mounted at one end of a cutting nozzle joint (7), the outer surface of the cutting nozzle shell (81) is provided with a sealing ring (85), the main cutting oxygen cavity (82) comprises a compression section (821) and a diffusion section (822), the diffusion section (822) is mounted below the compression section (821), and the compression section (821) is communicated with a cutting oxygen pipe (4).

5. A cutting tip as defined in claim 4, wherein: The sealing angle of the sealing ring (85) is 30 DEG 5' 1.8".

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