Flame cutting torch special for hydrogen-doped natural gas

Abstract

The utility model discloses a special flame cutting torch for hydrogen-doped natural gas, which comprises a cutting torch base, a cutting torch jacket, a cutting torch inner core and a cutting torch connecting piece, the front end of the cutting torch inner core is provided with a plum blossom-shaped cutting torch core head, the rear end of the cutting torch inner core is provided with an external thread inner core rod seat, the cutting torch inner core rod seat is in threaded connection with the cutting torch base, and the cutting torch connecting piece is connected with the cutting torch base. The tail end of the cutting torch outer sleeve is of an external thread structure, the cutting torch outer sleeve is connected with the cutting torch base through threads, the tail portion of the cutting torch base is of an internal thread structure and is connected with a cutting torch through threads, and the center of the tail portion of the cutting torch base is provided with a base core rod. The outer conical surface of the front end of the cutting torch inner core is in interference fit with the inner conical surface of the front end of the cutting torch outer sleeve, so that the coaxiality between the cutting torch inner core and the cutting torch outer sleeve is ensured, and no circumferential clearance is ensured. The structure can effectively avoid the problems of poor coaxiality, eccentricity and the like caused by the fact that only the front end line contact exists between the cutting torch inner core and the cutting torch outer sleeve in the traditional design, and air outlet distribution is not uniform and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cutting nozzle technical field, especially in a kind of flame cutting cutting nozzle special for hydrogen-doped natural gas. BACKGROUND

[0002] Flame cutting is a commonly used way of steel plate rough machining, its process is generally by the flame of fuel gas and oxygen premixed combustion sprayed from cutting nozzle to preheat cutting piece;Cutting piece reaches certain temperature and carries out combustion reaction with pure oxygen sprayed from cutting nozzle, simultaneously, slag, product is swept to form kerf;Under the condition of continuous gas supply, cutting nozzle moves according to preset direction to complete cutting task.

[0003] At present, the fuel gas of gas cutting mainly includes single gas such as acetylene, propane and mixed gas such as natural gas, coke oven gas.Each gas is different due to its combustion characteristics, and its adaptive cutting nozzle is special cutting nozzle.Among them, acetylene generally adopts ring-shaped cutting nozzle, propane, natural gas generally adopts plum blossom-shaped cutting nozzle.Hydrogen-doped natural gas combustion technology, due to its low carbon, high calorific value, high efficiency and other advantages, is one of the main low-carbon combustion technologies in future civil industry.The excellent combustion characteristics of hydrogen-doped natural gas provide a new idea for the development of next-generation cutting equipment.

[0004] After hydrogen is doped into natural gas, its calorific value is greatly improved compared with natural gas, but it still does not reach the combustion calorific value of acetylene, so the overall form of cutting nozzle using hydrogen-doped natural gas as cutting gas still adopts plum blossom-shaped cutting nozzle to concentrate flame and improve heating temperature.After hydrogen is doped into natural gas, its flame diffusion, flame structure and the like are different from natural gas, and the existing cutting nozzle structure cannot be directly applied to hydrogen-doped natural gas, the taper of cutting nozzle core head is small, the flame beam concentration degree and length are different, which leads to the decline of cutting quality;In addition, the cutting nozzle core head and the cutting nozzle base are only connected by threads, and there is no contact between the cutting nozzle core head and the cutting nozzle outer sleeve, so the coaxiality between the three is poor, the cutting nozzle core head and the outer sleeve are eccentric, which leads to uneven distribution of cutting gas and decline of cutting quality;At the same time, the existing cutting nozzle and cutting torch adopt nut fastening, and the cutting nozzle base and cutting torch joint are closed by taper interference fit, which requires high machining precision of taper, and is easy to loosen under the condition of long-term thermal strain of cutting nozzle. UTILITY MODEL CONTENTS

[0005] In view of the problems existing in the existing cutting nozzle, the utility model patent provides a cutting nozzle special for hydrogen-doped natural gas, and solves the defects of traditional cutting nozzle in fixed structure, concentricity and the like, improves cutting efficiency and reduces cost at the same time.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme adopts, a kind of hydrogen-doped natural gas special flame cutting cutting nozzle, including cutting nozzle base, cutting nozzle outer cover, cutting nozzle inner core and cutting torch connecting piece, the front end of cutting nozzle inner core is installed with plum blossom cutting nozzle core head, and rear end is outer thread inner core rod base, cutting nozzle inner core rod base is connected with cutting nozzle base by thread, and the end of cutting nozzle outer cover is outer thread structure, and cutting nozzle outer cover is connected with cutting nozzle base by thread.

[0007] The tail of the cutting nozzle base is an internal thread structure, and is connected with the cutting torch by a thread.

[0008] As a further description of the above technical solution: the outer side of the cutting nozzle inner core is provided with a honey waist structure overflow groove at both ends, and the other end of the cutting nozzle inner core is provided with an inner core external thread.

[0009] As a further description of the above technical solution: the bottom end of the cutting torch connecting piece is provided with a cutting nozzle inner core matching internal thread, and the cutting nozzle inner core matching internal thread is connected with the inner core external thread.

[0010] As a further description of the above technical solution: the inner end of the cutting nozzle base is provided with a cutting nozzle outer cover matching internal thread, the top end of the cutting nozzle outer cover is provided with a cutting nozzle outer cover external thread on the outer side, and the cutting nozzle outer cover matching internal thread is matched with the cutting nozzle outer cover external thread.

[0011] As a further description of the above technical solution: the bottom end of the cutting nozzle outer cover is provided with a core head matching taper surface, the outer end of the cutting torch connecting piece is provided with a cutting nozzle base matching external thread, the outer end of the cutting nozzle base is provided with a cutting torch connection matching internal thread, and the cutting nozzle base matching external thread and the cutting torch connection matching internal thread are corresponded to each other.

[0012] As a further description of the above technical solution: the inside of the cutting torch connecting piece, the cutting nozzle base and the cutting nozzle inner core is provided with a cutting oxygen through hole, one end of the inside of the cutting torch connecting piece is provided with a mixed gas through hole, and one end of the mixed gas through hole is provided with a gas guide hole.

[0013] As a further description of the above technical solution: the inside of the cutting torch connecting piece is provided with a cutting nozzle base matching taper surface, and the upper end of the cutting nozzle base is provided with a cutting torch connection matching taper surface.

[0014] The utility model has the advantages that:

[0015] 1. Compared with the prior art, the hydrogen-doped natural gas special flame cutting nozzle ensures coaxiality between the two and guarantees no circumferential gap through interference fit between the outer conical surface at the front end of the nozzle inner core and the inner conical surface at the front end of the nozzle outer sleeve. The structure can effectively avoid problems such as poor coaxiality and eccentricity caused by only linear contact between the nozzle inner core and the nozzle outer sleeve in traditional design, leading to uneven gas distribution.

[0016] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in conjunction with the drawings and examples.

[0018] Figure 1 is a schematic diagram of the overall structure of the present application.

[0019] Figure 2 is a schematic diagram of the nozzle inner core structure of the present application.

[0020] Figure 3 is a schematic diagram of the nozzle outer sleeve structure of the present application.

[0021] Figure 4 is a schematic diagram of the nozzle base structure of the present application.

[0022] Figure 5 is a schematic diagram of the torch connecting piece structure of the present application.

[0023] LEGEND:

[0024] 1. Torch connecting piece; 2. Nozzle base; 3. Nozzle inner core; 4. Nozzle outer sleeve; 5. Inner core outer thread; 6. Cutting oxygen through hole; 7. Honey waist structure overflow groove; 8. Nozzle core head; 9. Nozzle outer sleeve outer thread; 10. Core head matching conical surface; 11. Nozzle base matching outer thread; 12. Torch connection matching conical surface; 13. Torch connection matching inner thread; 14. Fuel gas gas guide hole; 15. Nozzle outer sleeve matching inner thread; 16. Nozzle inner core matching inner thread; 17. Nozzle base matching conical surface; 18. Mixed fuel gas through hole. DETAILED DESCRIPTION

[0025] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the drawings. The drawings serve to supplement the description in the written part of the specification, enabling one to intuitively and visually understand each technical feature and the overall technical scheme of the present application. However, it cannot be understood as a limitation on the scope of protection of the present application.

[0026] REFERENCE Figures 1-5The utility model provides a kind of embodiment, a kind of special flame cutting cutting nozzle of hydrogen-doped natural gas, including cutting nozzle base 2, cutting nozzle outer sleeve 4, cutting nozzle inner core 3 and cutting torch connecting piece 1, the front end of cutting nozzle inner core 3 is equipped with plum blossom cutting nozzle core head 8, and rear end is outer thread inner core rod base, cutting nozzle inner core rod base is connected by screw with cutting nozzle base 2, the end of cutting nozzle outer sleeve 4 is outer thread structure, cutting nozzle outer sleeve 4 is connected by screw with cutting nozzle base 2, cutting nozzle inner core and cutting nozzle outer sleeve need to bear high temperature of flame, therefore adopt red copper to process and improve its heat resistance;Meanwhile, structure outer surface is plated with chromium, to improve its anti-corrosion and prevent slag ability, cutting nozzle base and cutting torch connecting piece adopt brass, while guaranteeing high temperature resistance, reduce material cost and processing difficulty;

[0027] The tail of cutting nozzle base 2 is inner thread structure, and is connected by screw between cutting torch, the tail center of cutting nozzle base 2 is base core rod, and base core rod is installed in cooperation with the center inner taper surface of cutting torch connecting piece 1, cutting nozzle core head 8 inside includes gas guide groove and gas guide strip, the number, proportion, width and taper of gas guide groove and gas guide strip are determined according to gas hydrogen-doped proportion, i.e. the combustion characteristics of gas, and the front part of gas guide groove and gas guide strip is designed as bee waist structure, the outer taper surface of the front end of cutting nozzle inner core 3 cooperates with the inner taper surface of the front end of cutting nozzle outer sleeve 4, to ensure that the two are coaxial and have no circumferential gap;

[0028] The outer side of both ends of cutting nozzle inner core 3 is provided with bee waist structure overflow groove 7, the other end of cutting nozzle inner core 3 is provided with inner core outer thread 5, cutting nozzle outer sleeve 4 is connected by screw with cutting nozzle base 2, realizes the cooperation of the outer taper surface of the front end of cutting nozzle inner core 3 with the inner taper surface of the front end of cutting nozzle outer sleeve 4 by screw fastening, to ensure that the two are coaxial and have no circumferential gap;

[0029] The bottom end of cutting torch connecting piece 1 is provided with cutting nozzle inner core cooperation inner thread 16, and the cutting nozzle inner core cooperation inner thread 16 is connected with the inner core outer thread 5 in cooperation

[0030] The inner end of cutting nozzle base 2 is provided with cutting nozzle outer sleeve cooperation inner thread 15, the top end of cutting nozzle outer sleeve 4 is provided with cutting nozzle outer sleeve outer thread 9, the cutting nozzle outer sleeve cooperation inner thread 15 cooperates with the cutting nozzle outer sleeve outer thread 9, mixed fuel gas entering cutting nozzle from cutting torch, through cutting nozzle base 2, enters the mixed fuel gas passage 18 between cutting nozzle inner core 3 and cutting nozzle outer sleeve 4;Cutting nozzle base 2 is arranged in multiple holes symmetrically in circumference, to improve the flow uniformity of mixed fuel gas entering cutting nozzle, mixed fuel gas flowing through the passage between cutting nozzle inner core 3 and cutting nozzle outer sleeve 4, enters the bee waist structure of cutting nozzle inner core 3, and the bee waist structure is mainly gas buffer zone;Further, mixed fuel gas flows through cutting nozzle core head 8 gas guide groove, to further improve its flow distribution uniformity and flame concentration.

[0031] The thread connection between the cutting nozzle base 2 and the cutting torch connecting piece 1 is fastened by a screw thread, so that the outer taper surface of the base core rod and the central inner taper surface of the cutting torch connecting piece 1 are in interference fit, and the gas is sealed.

[0032] The bottom end of the cutting nozzle cover 4 is provided with a core head matching taper surface 10, the outer end of the cutting torch connecting piece 1 is provided with a cutting nozzle base matching outer thread 11, the outer end of the cutting nozzle base 4 is provided with a cutting torch connection matching inner thread 13, the cutting nozzle base matching outer thread 11 and the cutting torch connection matching inner thread 13 correspond to each other, the cutting torch connecting piece 1, the cutting nozzle base 2 and the cutting nozzle inner core 3 are all provided with a cutting oxygen through hole 6, the inner side of the cutting torch connecting piece 1 is provided with a mixed gas through hole 18, one end of the mixed gas through hole 18 is provided with a gas guide hole 14, the cutting torch connecting piece 1 is provided with a cutting nozzle base matching taper surface 17, the upper end of the cutting nozzle base 2 is provided with a cutting torch connection matching taper surface 12, the hydrogen-doped natural gas has different combustion characteristics with the change of the hydrogen-doping ratio, so that new requirements are put forward for the cutting nozzle structure, in the utility model, by changing the number, proportion, width and taper of the gas guide groove and the gas guide strip, the hydrogen-doped natural gas special cutting nozzle design suitable for different hydrogen-doping ratios can be realized, and the gas guide hole 14 in the patent is uniformly arranged in the circumferential direction, so that the gas distribution operation of the cutting nozzle is improved, in addition, the cutting nozzle core head 8 is in the circumferential plum blossom structure;

[0033] In the design, the cutting nozzle base 2 is directly connected with the cutting torch by a thread, and the interference fit between the outer taper surface of the base core rod and the central inner taper surface of the cutting torch connecting piece is realized by the fastening degree of the thread, the above design not only ensures the air tightness, but also ensures the coaxiality between the cutting nozzle base 2 and the cutting torch connecting piece 1, in the existing cutting nozzle design, the cutting nozzle base 2 and the cutting torch are fastened by a third nut, and a double taper surface structure is adopted, so that the machining precision is extremely high, and the coaxiality and perpendicularity are difficult to ensure. Therefore, compared with the above design, the number of parts can be reduced, and the disassembly is convenient.

[0034] At the same time, in the cutting nozzle base 2, the original single-hole gas passage structure is changed into a multi-hole structure symmetrically processed in the circumferential direction, has a rectification effect, realizes the uniform distribution of the mixed gas in the cavity of the cutting nozzle in advance, and improves the combustion efficiency.

[0035] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the technical field without departing from the purpose of the utility model.

Claims

1. A hydrogen-doped natural gas special-purpose flame cutting torch tip, comprising a tip base (2), a tip outer sleeve (4), a tip inner core (3) and a torch connecting piece (1), characterized in that, The front end of the cutting nozzle inner core (3) is provided with a plum blossom cutting nozzle core head (8), and the rear end is an externally threaded inner core rod seat, which is connected with the cutting nozzle base (2) through threads. The tail of the cutting nozzle base (2) is an internally threaded structure, which is connected with the cutting torch through threads.

2. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The outer side of the cutting nozzle inner core (3) is provided with a bee waist structure overflow groove (7) at both ends.

3. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The bottom end of the cutting nozzle base (2) is provided with a cutting nozzle inner core matching internal thread (16), which is connected with the inner core external thread (5).

4. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The inner end of the cutting nozzle base (2) is provided with a cutting nozzle outer sleeve matching internal thread (15), and the top end of the cutting nozzle outer sleeve (4) is provided with a cutting nozzle outer sleeve external thread (9).

5. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The bottom end of the cutting nozzle outer sleeve (4) is provided with a core head matching taper surface (10), the outer end of the cutting torch connecting piece (1) is provided with a cutting nozzle base matching external thread (11), the outer end of the cutting nozzle base (2) is provided with a cutting torch connection matching internal thread (13), and the cutting nozzle base matching external thread (11) and the cutting torch connection matching internal thread (13) correspond to each other.

6. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The inside of the cutting torch connecting piece (1), the cutting nozzle base (2) and the cutting nozzle inner core (3) is provided with a cutting oxygen through hole (6), and the inner side of the cutting torch connecting piece (1) is provided with a mixed gas through hole (18), and the one end of the mixed gas through hole (18) is provided with a gas guide hole (14) inwardly.

7. The hydrogen-blend natural gas dedicated flame cutting torch tip of claim 1, wherein, The inside of the cutting torch connecting piece (1) is provided with a cutting nozzle base matching taper surface (17), and the upper end of the cutting nozzle base (2) is provided with a cutting torch connection matching taper surface (12).

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