Detachable flame cutting torch

Abstract

The utility model discloses a detachable flame cutting torch, and belongs to the technical field of flame cutting. The flame cutting torch comprises a cutting torch inner core, a cutting torch outer sleeve and a cutting torch connecting piece, an outer conical surface is arranged at the end of the cutting torch inner core, and an inner conical surface matched with the outer conical surface is arranged on the inner wall of the end of the cutting torch outer sleeve; the cutting torch is composed of the cutting torch inner core, the cutting torch outer sleeve and the cutting torch connecting piece, five parts of an original cutting torch are simplified into three core parts, the structure of the cutting torch is simplified, and the cutting torch has the advantages that the structure is simple, the cost is low, the production efficiency is high, the production cost is low, and the production cost is low. And the cutting torch inner core and the cutting torch outer sleeve can be rapidly disassembled, assembled and replaced, the cutting torch outer sleeve and the cutting torch inner core are changed into a full-body cylindrical flat milling structure from an original hexagon nut structure, and the machining difficulty and cost are reduced while the disassembling function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flame cutting, and more particularly to a detachable flame cutting nozzle. Background Art

[0002] Flame cutting is a common method for rough processing of steel plates. The process generally involves preheating the workpiece by burning a flame premixed with fuel gas and oxygen ejected from the cutting nozzle. The oxygen acts as a combustion aid, increasing the melting temperature. After the workpiece reaches a certain temperature, it reacts with the pure oxygen ejected from the cutting nozzle to burn. At the same time, the high-pressure oxygen purges the slag and molten metal to form a cutting seam. Under the condition of continuous gas supply, the cutting nozzle moves in the preset direction to complete the cutting task.

[0003] Currently, fuel gases used for gas cutting primarily include single gases like acetylene and propane, as well as mixed gases like natural gas and coke oven gas. Each gas has its own unique combustion characteristics, necessitating specialized cutting nozzles. Acetylene generally uses a ring-shaped cutting nozzle, while propane and natural gas typically use a plum blossom-shaped nozzle.

[0004] After natural gas is mixed with hydrogen, its calorific value is greatly improved compared with natural gas, but it still does not reach the combustion calorific value of acetylene. Therefore, the overall form of the cutting nozzle using hydrogen-mixed natural gas as the cutting gas is still a plum blossom-shaped cutting nozzle to concentrate the flame and increase the heating temperature. After natural gas is mixed with hydrogen, its flame diffusion and flame structure are different from those of natural gas. The existing cutting nozzle structure cannot be directly applied to hydrogen-mixed natural gas. The existing cutting nozzle core head has a small taper, and the flame beam concentration and length are poor, resulting in reduced cutting quality. The cutting nozzle base and the cutting nozzle core head are only connected by threads, and there is no contact between them and the cutting nozzle jacket. Therefore, the coaxiality between the three is poor, and the cutting nozzle core head and the jacket are eccentric, resulting in uneven cutting gas distribution and reduced cutting quality. In addition, the cutting nozzle base and the cutting nozzle core head are split structures, which are relatively complex. At the same time, the existing cutting nozzle base and the cutting torch are fastened with nuts, and the gas is sealed between the cutting nozzle base and the cutting torch connector by means of a conical interference fit. This connection method requires extremely high conical surface processing accuracy. In addition, the first cutting oxygen passage of the cutting nozzle core head is a constant diameter flow channel, which is prone to cause large energy loss.

[0005] In view of this, we propose a detachable flame cutting nozzle. Utility Model Content

[0006] The purpose of the present invention is to provide a detachable flame cutting nozzle to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A detachable flame cutting nozzle comprises a nozzle inner core, a nozzle outer shell and a cutting torch connecting piece, wherein the end of the nozzle inner core is provided with an outer conical surface, and the inner wall of the end of the nozzle outer shell is provided with an inner conical surface matching the outer conical surface;

[0009] The cutting torch connecting piece is provided with a first connecting portion at one end of the inner core of the cutting nozzle, and a second connecting portion is provided outside the first connecting portion. The end of the inner core of the cutting nozzle extends to the inner wall of the first connecting portion, and the inner core of the cutting nozzle is threadedly connected to the first connecting portion. The end of the outer shell of the cutting nozzle extends between the inner wall of the second connecting portion and the outer wall of the first connecting portion, and the outer shell of the cutting nozzle is threadedly connected to the second connecting portion.

[0010] A plurality of gas guide grooves and gas guide strips are arranged in an annular shape on the outer conical surface, and a gas guide groove is formed between the side walls of two adjacent gas guide strips.

[0011] Preferably, a first cutting oxygen passage is provided in the cutting torch connecting piece, a mixed gas passage is provided on one side of the first cutting oxygen passage, the first cutting oxygen passage is connected to the inner wall of the first connecting part, and the mixed gas passage is connected to the inside of the second connecting part.

[0012] Preferably, a first sealing groove is formed at the end of the first connecting portion.

[0013] Preferably, a step is provided at one end of the cutting nozzle inner core close to the cutting torch connecting piece, a second sealing groove is provided on the step, the second sealing groove corresponds to the position of the first sealing groove, and a sealing gasket is provided between the second sealing groove and the first sealing groove.

[0014] Preferably, a second cutting oxygen passage is opened in the middle of the inner core of the cutting nozzle, and the second cutting oxygen passage consists of segment L1, segment L2 and segment L3. The apertures of segment L1 and segment L3 gradually decrease from the outer end to segment L2.

[0015] Preferably, a milled flat groove is provided on the circumferential surface of the cutting nozzle outer shell.

[0016] Preferably, a fastening nut is further provided between the second connecting portion and the cutting nozzle housing.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] (1) The cutting nozzle of the utility model is composed of a cutting nozzle core, a cutting nozzle outer shell and a cutting torch connecting piece. The original five parts of the cutting nozzle are simplified into three core parts, so that the cutting nozzle structure is simplified and the cutting nozzle core and the cutting nozzle outer shell can be quickly disassembled and replaced. The cutting nozzle outer shell and the cutting nozzle core are changed from the original hexagonal nut structure to a full-body cylindrical milling flat structure. While realizing the disassembly function, the processing difficulty and cost are reduced.

[0019] (2) The original double-conical surface matching between the outer shell of the cutting nozzle and the inner core of the cutting nozzle and the connecting piece requires extremely high processing accuracy; while the structure of the present application only has the matching of the outer conical surface of the front end of the inner core of the cutting nozzle and the inner conical surface of the outer shell of the cutting nozzle, and is fastened with an auxiliary nut, which reduces the processing accuracy and cost while achieving good sealing.

[0020] (3) The present application sets the second cutting oxygen passage in the center of the inner core 1 of the cutting nozzle to an asymmetric tapered-equal-diameter-gradually diverging structure, that is, the gas is first compressed once by the tapered structure in the L1 section to accelerate the gas, and then the gas is accelerated a second time by the low back pressure gradually diverging structure L3 section. The two accelerations make the cutting oxygen have an extremely high flow rate, thereby improving the cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the detachable flame cutting nozzle of the utility model;

[0022] Figure 2 This is a schematic structural diagram of a cutting torch connector of the present invention;

[0023] Figure 3 This is a schematic diagram of the inner core structure of the cutting nozzle of the present invention;

[0024] Figure 4 This is a schematic diagram of the cutting nozzle jacket structure of the present utility model.

[0025] Explanation of the numbers in the figure: 1. Inner core of cutting nozzle; 101. External thread A; 102. Second sealing groove; 103. Gas guide groove; 104. Gas guide strip; 105. External conical surface; 2. Cutting nozzle outer sleeve; 201. External thread B; 202. Milling flattened groove; 203. Internal conical surface; 3. Cutting torch connecting piece; 301. First cutting oxygen passage; 302. Mixed gas passage; 303. First connecting part; 304. Second connecting part; 305. Internal thread A; 306. Internal thread B; 307. First sealing groove; 4. Sealing gasket; 5. Fastening nut. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example:

[0028] See also Figure 1-4A detachable flame cutting nozzle includes a nozzle core 1, a nozzle outer sleeve 2 and a cutting torch connector 3. The end of the nozzle core 1 is provided with an outer conical surface 105, and the inner wall of the end of the nozzle outer sleeve 2 is provided with an inner conical surface 203 that cooperates with the outer conical surface 105; by tightening the nozzle outer sleeve 2, the outer conical surface 105 at the front end of the nozzle core 1 and the inner conical surface 203 of the nozzle outer sleeve 2 are interference fit to ensure that the two are coaxial and have no circumferential gap.

[0029] The cutting torch connecting piece 3 is provided with a first connecting portion 303 at one end of the cutting nozzle inner core 1, and a second connecting portion 304 is provided outside the first connecting portion 303. The end of the cutting nozzle inner core 1 extends to the inner wall of the first connecting portion 303. The cutting nozzle inner core 1 is threadedly connected to the first connecting portion 303, that is, the external thread A101 at the end of the cutting nozzle inner core 1 is threadedly engaged with the internal thread A305;

[0030] The end of the cutting nozzle housing 2 extends between the inner wall of the second connecting portion 304 and the outer wall of the first connecting portion 303. The cutting nozzle housing 2 is threadedly connected to the second connecting portion 304, that is, the external thread B201 is threadedly engaged with the internal thread B306.

[0031] Multiple gas guide grooves 103 and gas guide strips 104 are arranged in a circular pattern on the outer conical surface 105. A gas guide groove 103 is formed between the sidewalls of two adjacent gas guide strips 104. The front end of the cutting nozzle core 1 is a plum blossom-shaped cutting nozzle core head with an outer conical surface. The cross-sectional structure of the gas guide strips 104 is rectangular. The number, ratio, width, and taper of the gas guide grooves 103 and gas guide strips 104 are determined by the hydrogen blending ratio of the gas, that is, the combustion characteristics of the gas. For gas with different hydrogen blending ratios, the structure of the gas guide strips 104 remains unchanged; only the number of gas guide strips 104 is adjusted to control the cross-sectional area of ​​the gas guide grooves 103. This cross-sectional area is the flow area for the gas / preheated oxygen mixture. Natural gas with different hydrogen blending ratios has different combustion characteristics, and therefore requires different cross-sectional areas for the mixture flow.

[0032] In this application, a first cutting oxygen passage 301 is opened in the cutting torch connecting piece 3, and a mixed gas passage 302 is set on one side of the first cutting oxygen passage 301. The first cutting oxygen passage 301 is connected to the inner wall of the first connecting part 303, and the mixed gas passage 302 is connected to the inside of the second connecting part 304.

[0033] In the present application, a first sealing groove 307 is provided at the end of the first connecting portion 303, wherein a step is provided at one end of the cutting nozzle inner core 1 close to the cutting torch connecting piece 3, and a second sealing groove 102 is provided on the step. The second sealing groove 102 corresponds to the position of the first sealing groove 307, and a sealing gasket 4 is provided between the second sealing groove 102 and the first sealing groove 307. The sealing gasket 4 can be a copper gasket.

[0034] In this application, a second cutting oxygen passage is defined in the center of the cutting nozzle core 1. This passage consists of segments L1, L2, and L3, with the apertures of segments L1 and L3 gradually decreasing from their outer ends toward segment L2. This second cutting oxygen passage, formed at the center of the cutting nozzle core 1, has an asymmetric, tapered-constant-diameter-gradually diverging structure. In segment L1, the gas is first compressed and accelerated by the tapered structure, and then accelerated a second time by the low-back-pressure, diverging segment L3. This double acceleration results in an extremely high flow rate for the cutting oxygen, improving cutting efficiency.

[0035] The inner core 1 of the cutting nozzle is cylindrical except for the core head and the rear end external thread A101. The middle part L2 is cylindrical. For the convenience of operation, it is flattened at the symmetrical position in the middle of the cylinder so that the thread can be tightened with a wrench.

[0036] In this application, a milled flat groove 202 is provided on the circumferential surface of the nozzle housing 2. The nozzle housing 2 is cylindrical except for the front conical surface structure and the end external thread A101. The milled edge is symmetrically located in the middle of the cylinder to form a milled flat groove 202 for screw tightening with a wrench.

[0037] In the present application, a fastening nut 5 is further provided between the second connecting portion 304 and the cutting nozzle housing 2 , and the fastening nut 5 is used to achieve fastening between the cutting nozzle housing 2 and the cutting nozzle connector 3 .

[0038] Working principle:

[0039] When the cutting nozzle inner core 1, the cutting nozzle outer shell 2 and the cutting torch connecting piece 3 are connected, the cutting nozzle inner core 1 is directly connected to the internal thread A305 at the first cutting oxygen passage 301 in the center of the connecting piece 3; the internal thread A305 at the lower end of the first cutting oxygen passage 301 in the center of the cutting torch connecting piece 3 and the external thread A101 on the rod seat of the cutting nozzle inner core 1 are matched in a plane; grooves are milled on the upper and lower surfaces and sealed with a heat-treated sealing gasket 4 to improve its airtightness. The external thread B201 at the end of the cutting nozzle sleeve 2 is directly connected to the internal thread B306 of the cutting torch connector 3, and a fastening nut 5 is used to assist in reverse fastening; the outer conical surface 105 at the front end of the cutting nozzle core 1 and the inner conical surface 203 of the cutting nozzle sleeve 2 have the same taper and height dimensions; by fastening the cutting nozzle sleeve 2, the outer conical surface 105 at the front end of the cutting nozzle core 1 and the inner conical surface 203 of the cutting nozzle sleeve 2 are interference fit to ensure that the two are coaxial and have no circumferential gap, and the gas is evenly distributed according to the gas guide groove 103 to avoid circumferential crossflow and achieve positioning between the two; at the same time, the fastening nut 5 is used to achieve fastening between the cutting nozzle sleeve 2 and the cutting nozzle connector 3.

[0040] After the cutting nozzle core 1, the cutting nozzle outer shell 2 and the cutting torch connector 3 are connected, the first cutting oxygen passage 301 in the center of the cutting torch connector 3 is connected with the second cutting oxygen passage in the center of the cutting nozzle core 1 to form a total cutting oxygen passage; the second cutting oxygen passage in the center of the cutting nozzle core 1 is an asymmetric tapered-equal diameter-gradually expanding structure, that is, in the L1 section, the gas is first compressed once by the tapered structure to accelerate the gas, and then the gas is accelerated twice by the L3 section, a gradual expansion structure with low back pressure. The two accelerations make the cutting oxygen have an extremely high flow rate, thereby improving the cutting efficiency; the L1 section and the L2 section 、 The inlet inner diameters of the L3 section are d1, d2, and d3, respectively. The design and calculation are based on the gas dynamics principle, inlet gas parameters, and the thickness of the cutting steel plate to ensure that the cutting oxygen outlet flow rate reaches supersonic speed and improve the steel plate cutting efficiency.

[0041] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A detachable flame cutting nozzle, comprising a nozzle inner core (1), a nozzle outer shell (2) and a cutting torch connecting piece (3), characterized in that: The end of the cutting nozzle inner core (1) is provided with an outer conical surface (105), and the inner wall of the end of the cutting nozzle outer shell (2) is provided with an inner conical surface (203) that matches the outer conical surface (105); The cutting torch connecting piece (3) is provided with a first connecting portion (303) at one end of the cutting nozzle inner core (1), and a second connecting portion (304) is provided outside the first connecting portion (303). The end of the cutting nozzle inner core (1) extends to the inner wall of the first connecting portion (303), and the cutting nozzle inner core (1) is threadedly connected to the first connecting portion (303). The end of the cutting nozzle outer shell (2) extends between the inner wall of the second connecting portion (304) and the outer wall of the first connecting portion (303), and the cutting nozzle outer shell (2) is threadedly connected to the second connecting portion (304); A plurality of gas guide grooves (103) and gas guide strips (104) are arranged in an annular shape on the outer conical surface (105), and a gas guide groove (103) is formed between the side walls of two adjacent gas guide strips (104).

2. The detachable flame cutting nozzle according to claim 1, characterized in that: A first cutting oxygen passage (301) is provided in the cutting torch connecting piece (3), a mixed gas passage (302) is provided on one side of the first cutting oxygen passage (301), the first cutting oxygen passage (301) is communicated with the inner wall of the first connecting part (303), and the mixed gas passage (302) is communicated with the inside of the second connecting part (304).

3. The detachable flame cutting nozzle according to claim 1, characterized in that: A first sealing groove (307) is provided at the end of the first connecting portion (303).

4. The detachable flame cutting nozzle according to claim 3, characterized in that: A step is provided on one end of the cutting nozzle inner core (1) close to the cutting torch connecting piece (3), and a second sealing groove (102) is provided on the step. The second sealing groove (102) corresponds to the position of the first sealing groove (307), and a sealing gasket (4) is provided between the second sealing groove (102) and the first sealing groove (307).

5. The detachable flame cutting nozzle according to claim 1, characterized in that: A second cutting oxygen passage is provided in the middle of the inner core (1) of the cutting nozzle. The second cutting oxygen passage consists of an L1 section, an L2 section and an L3 section. The apertures of the L1 section and the L3 section gradually decrease from the outer end to the L2 section.

6. The detachable flame cutting nozzle according to claim 1, characterized in that: A milling groove (202) is provided on the circumferential surface of the cutting nozzle outer sleeve (2).

7. The detachable flame cutting nozzle according to claim 1, characterized in that: A fastening nut (5) is also provided between the second connecting portion (304) and the cutting nozzle outer sleeve (2).

Images