CN216925181U - Fin belt with quasi-opening crack arrest and furnace tube with fin belt - Google Patents

Abstract

The utility model relates to the technical field of petrochemical industry heat exchange equipment, in particular to a fin belt with quasi-opening crack arrest and a furnace tube with the fin belt. Because the quasi-opening indentation is arranged, before the fin belt is wound, complete fin teeth are not formed, but the gap openings among the fin teeth reach a critical state, the inter-tooth spaces are about to be separated and are not separated, the cracking effect of the original opening fin root is eliminated, and the problem that the fin is easy to break is solved. When the fin belt is wound on the furnace tube, the quasi-opening indentation can be torn by the winding tension, and when the fin root is torn, the high-frequency welding is completed, so that the fin teeth are prevented from being broken by pulling.

Description

Fin belt with quasi-opening crack arrest and furnace tube with fin belt

Technical Field

The utility model relates to the technical field of petrochemical engineering heat exchange equipment, in particular to a fin belt with a quasi-opening crack arrest function and a furnace tube with the fin belt.

Background

The heating furnace is a tap in petrochemical industry and comprises a normal pressure furnace, a decompression furnace, a hydrogen production furnace, a reforming furnace, a coking furnace, a reforming furnace, a cracking furnace and the like. The tubular furnace functions to heat the medium (crude oil, oil or gas) to the temperature required by the process for refining. The finned tube belongs to a high-efficiency heat exchange energy-saving element of heat exchange special equipment in mechanical equipment engineering, and can be particularly used for heat exchange requirements of petroleum refining and chemical industry, coal chemical industry, chemical fertilizers, air conditioners, air cooling, electric power facility equipment and the like, and comprises application modes of heating or cooling a medium and the like. The finned tube is a core element for strengthening heat transfer of the heating furnace, wherein the fin structure which is spirally wound, assembled and welded on the surface of a smooth furnace tube is very important.

The furnace tube is a key element for enhancing heat transfer of the heating furnace and is divided into three types, namely a light tube without fins on the surface, a nail head tube with nails on the surface, a finned tube with fins on the surface and the like, wherein the finned tube is divided into two types, namely a sleeved finned tube, a spiral winding high-frequency resistance welding finned tube and the like. The fin sleeving process includes punching to form fin batch, and sleeving the fin on the outer surface of the pipe manually or mechanically in certain interval. It is an earlier method of processing finned tubes. The spiral winding assembly welding is to continuously wind the fin steel belt on the surface of the smooth furnace tube and weld the fin and the steel tube together through a high-frequency power supply, so that the connection is tight and the heat transfer is smooth, thereby being an important core structure.

The fin is formed by spreading a coiled smooth steel band and processing the steel band in a certain width by using a fin rolling machine, one side of the width of the steel band is processed into the fin, the other side of the width of the steel band is connected together, the fin steel band has certain connection strength, and the fin steel band can bear certain tension F when being wound on the smooth furnace tube, wherein the tension is required for tightly winding the steel band on the surface of the steel tube and positioning the steel band structurally, and is also required for straightening the steel band by a welding technology to enable the steel band to be dynamically attached to an electrode. In actual production, due to the influences of factors such as steel pipe straightness, equipment precision, parameter stability and material performance, particularly the edge effect at the root of a fin tooth, a fin steel belt is frequently broken when being wound on a smooth furnace pipe, and the product quality and the production efficiency are seriously influenced.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides the fin belt with the quasi-opening crack arrest function and the furnace tube with the fin belt, and the fin teeth of the fin belt are not easy to break by pulling.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a fin area with accurate opening crack arrest, includes the banding area body of rectangular strip, the lateral part of taking the body has a plurality of accurate opening indentation of range along length direction stamping forming, and every accurate opening indentation arranges along the width direction of taking the body, and is a plurality of under peripheral winding pulling force accurate opening indentation can be torn and form the inter-fin gap, forms the wing tooth between the gap between two adjacent inter-fin gaps.

Specifically, the depth of the quasi-open indentation is greater than 1/2 the thickness of the belt body.

Specifically, the belt body is a steel belt.

Specifically, the quasi-opening indentation is in a V shape or a semi-circular arc shape.

Specifically, the depth of the quasi-open indentation may be the same or different everywhere.

Specifically, the depth of the quasi-opening indentation gradually increases along the direction away from the side edge of the belt body.

Specifically, the side surface of the belt body is formed with densely distributed concave-convex lines in one or a combination of more than two of wave shape, triangular shape, edge shape and round shape.

The utility model also provides a furnace tube with the fin belt, which comprises a tube body, wherein the belt body is spirally wound along the circumferential direction or the length direction of the tube body.

Specifically, the belt body is welded and fixed with the pipe body.

The utility model has the beneficial effects that:

compared with the prior art, the fin belt with the quasi-opening crack arrest and the furnace tube with the fin belt have the advantages that as the quasi-opening indentation is arranged, complete fin teeth are not formed before the fin belt is wound, but gap openings to be formed between the quasi-fin teeth reach a critical state, the inter-teeth are separated but not really separated, and a weak layer is connected together, so that the crack initiation effect of the original opening fin root is eliminated, and the problem that the fin with the straight-line-shaped cutting edge is easy to break is solved. When the fin belt is wound on the smooth furnace tube, the thin layer connected between the fin teeth can be torn by the winding tension, and when the fin belt is torn to the fin root, the high-frequency welding is finished, so that the fin belt is prevented from being broken by pulling.

Drawings

Fig. 1 is a schematic structural diagram of a furnace tube in an embodiment.

Fig. 2 is a partial structural schematic view of the fin strip in an embodiment before winding, showing the quasi-open impression of the strip body.

Reference numerals:

the fin band comprises a tube body 1, a fin band 2, a band body 21, fin teeth 22, quasi-opening indentations 23 and concave-convex grains 24.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

The furnace tube of the present embodiment, as shown in fig. 1 to 2, includes a tube body 1 and a fin band 2, the fin band 2 includes a strip-shaped steel band body 21, the band body 21 is spirally wound along the length direction of the tube body 1, and one side of the band body 21 is welded and fixed to the tube body 1. Before winding, the side portion of the belt body 21 is press-formed with a plurality of quasi open indentations 23 arrayed in the length direction as shown in fig. 2, each quasi open indentation 23 being arranged in the width direction of the belt body 21. During winding, under the action of peripheral winding tension, a plurality of quasi-opening indentations 23 can be torn to form inter-fin gaps, and fin teeth 22 are formed between every two adjacent inter-fin gaps, as shown in fig. 1. Compared with the prior art, because the quasi-opening indentation 23 is arranged, before the fin belt 2 is wound, the complete fin teeth 22 are not formed, but the gap openings to be formed between the quasi-fin teeth 22 reach a critical state, the inter-tooth spaces are to be separated but not really separated, but a weak layer is connected together, the cracking effect of the original opening fin root is eliminated, and the problem that the fin with the linear cutting edge is easy to break is solved. When the fin belt 2 is wound on a smooth furnace tube, the thin layers connected among the fin teeth 22 can be torn by the winding tension, and when the fin belt is torn to the fin root, the high-frequency welding is finished, so that the fin belt is prevented from being broken.

The specific principle is as follows: if there is no weak layer between the openings of the fin teeth 22, the tension generated when the inter-tooth distance is extended is applied to the root of the fin in one step after the winding is started, and the tearing start position is also applied from the root of the fin in one step. In the embodiment, the openings of the fin teeth 22 are connected together by a weak layer, after the winding is started, the tension generated when the distance between the teeth is expanded is borne by the weak layer, and after the weak layer is torn, part of the tension is consumed, the time is delayed, and then the tension is applied to the original fin root. When the fin root is used as the original fin root, the fin base at the corresponding position of the fin root is welded with the furnace tube, so that the fin steel band is not broken, or the fin steel band is not broken at the moment. The final product sought is a finned tube.

In practice, the depth of the quasi-open indentations 23 is greater than 1/2 of the thickness of the tape body 21, which ensures that the quasi-open indentations 23 can be torn to form the fins 22 when wound.

In the present embodiment, the quasi-opening indentation 23 is preferably V-shaped, so that a linear cutting edge in a straight line shape is formed at the bottom of the quasi-opening indentation 23, and the quasi-opening indentation is easily torn to form a linear inter-fin slit. In practice, of course, the quasi-open indentation 23 may be semi-circular.

In this embodiment, the depth of the quasi open indentation 23 is the same or different from place to place. When the difference is different, the depth of the quasi-opening indentation 23 is preferably gradually increased along the direction far away from the side edge of the belt body 21, so that the strength required for tearing the inter-fin gap from outside to inside is larger, and the protection effect on the fin root is more obvious.

In this embodiment, the densely-distributed concave-convex patterns 24 are formed on the side surface of the belt body 21 (including the fin teeth 22) by rolling, so that the areas of the front side surface and the back side surface of the fin teeth 22 are enlarged, a certain disturbance effect can be exerted on the flue gas flowing through the bottom of the deep and narrow gap between the two fin teeth 22, the heat exchange between the flue gas and the side surface of the fin teeth 22 is enhanced, and the improvement of the heat efficiency of the heating furnace is facilitated. The manufacturing process is realized by rolling the embossing wheel set, a required concave-convex groove is processed on the outer circular surface of the embossing wheel set to serve as a die of an indentation, and the depth of the indentation is adjusted by trial production, so that the fin material subjected to rolling plastic deformation still meets the requirement of spiral winding on mechanical property. The produced open finned tube and the industrial furnace thereof meet the project requirements, and the overall performance meets the requirements of required devices.

The concave-convex pattern 24 is one or the combination of more than two of wave shape, triangle shape, edge shape and round shape. The wave-shaped striations have the main function of improving the convection heat transfer coefficient of the turbulent flow medium, and have the secondary function of expanding the heat transfer area. The triangular indentation has the main function of expanding the heat exchange area (because the perimeter of the triangle is the longest under the same area), and the secondary function of improving the convective heat transfer coefficient by the turbulent flow medium.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. A fin belt with quasi-opening crack arrest, characterized by: including the banding area body of rectangular, the lateral part of taking the body has a plurality of accurate opening indentation of range along length direction stamping forming, and every accurate opening indentation arranges along the width direction who takes the body, and is a plurality of under peripheral winding pulling force effect accurate opening indentation can be torn and form the gap between the wing, forms the wing tooth between two adjacent inter-wing gaps.

2. A fin strip with quasi open crack arrest of claim 1, wherein: the depth of the quasi-open indentation is greater than 1/2 the thickness of the belt body.

3. A fin strip with quasi open crack arrest of claim 1, wherein: the belt body is a steel belt.

4. A fin strip with quasi open crack arrest of claim 1, wherein: the quasi-opening indentation is V-shaped or semicircular.

5. A fin strip with quasi open crack arrest of claim 1, wherein: the depth of the quasi-open indentation may be the same or different from place to place.

6. A fin strip with quasi open crack arrest of claim 1, wherein: the depth of the quasi-opening indentation is gradually increased along the direction far away from the side edge of the belt body.

7. A fin strip with quasi open crack arrest of claim 1, wherein: the side surface of the belt body is roll-formed with densely distributed concave-convex lines which are in one or the combination of more than two of wave shape, triangular shape, prism shape and round shape.

8. Furnace tube with quasi-open crack-arresting fin bands according to any of claims 1 to 7, characterized in that: comprises a pipe body, and a belt body is spirally wound along the circumferential direction or the length direction of the pipe body.

9. The furnace tube of claim 8, wherein: the belt body and the pipe body are welded and fixed with each other.

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