Double-layer metal pipe with thread structure

Abstract

The utility model discloses a double-layer metal pipe with a thread structure, relates to the field of heat exchange elements, and aims to solve the problem that the overall heat exchange performance of the pipe is greatly reduced due to the fact that gaps are generated due to poor consistency of the size or the performance of the double-metal composite pipe in the prior art. A first thread and a second thread are arranged on the inner-layer pipe, an outer-layer pipe is arranged outside the inner-layer pipe, the inner-layer pipe and the outer-layer pipe are made of different metals, a transition layer is arranged between the inner-layer pipe and the outer-layer pipe, and the transition layer is made of the same metal as the inner-layer pipe or alloy of the inner-layer pipe and the outer-layer pipe. The double-layer structure is combined with the thread design, the mechanical performance and corrosion resistance of the pipe can be improved, the service life is prolonged, the transition layer is arranged between the inner-layer pipe and the outer-layer pipe, metal of the inner-layer pipe, metal of the transition layer and metal of the outer-layer pipe are tightly combined together through the diffusion effect, and gaps between the inner layer and the outer layer are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange element technical field, concretely is a double -layer metal pipe with screw structure. BACKGROUND

[0002] There is a patent to mention the metal pipe containing inside and outside two layers, inside and outside are all smooth surface structure, this pipe material can utilize inside and outside pipe material respective performance, provides different use under specific condition.

[0003] Some occasions need pipe material to have corrosion resistance and heat transfer performance, inside the pipe has refrigerant, directly with refrigerant contact part requires having good strength and corrosion resistance, often selects stainless steel or titanium alloy, pipe material outside adopts copper or aluminum alloy, is used for heat dissipation, but when inside is titanium or stainless steel, its heat conduction performance is greatly different from single layer copper or aluminum's heat conduction performance, in some occasions needing strong heat transfer performance, it is difficult to meet the requirement.

[0004] And when preparing the composite pipe, the inner layer pipe and the outer layer pipe are not good in material performance and size consistency, which causes air gap, and the heat conduction coefficient of the air gap is far less than that of the metal, so if there is a gap, the overall heat transfer performance of the pipe will be greatly affected. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem of overcoming the defects of the prior art and provides a double-layer metal pipe with a threaded structure, which can effectively solve the problems in the background art.

[0006] To achieve the above object, the utility model discloses a double-layer metal pipe with a threaded structure, which adopts the technical scheme of comprising an inner layer pipe. The inner layer pipe is provided with an outer layer pipe, the inner layer pipe and the outer layer pipe are made of different metals, and a transition layer is arranged between the inner layer pipe and the outer layer pipe. The transition layer is made of the same metal as the inner layer pipe or an alloy of the inner layer pipe and the outer layer pipe. The transition layer serves to connect the inner layer pipe and the outer layer pipe.

[0007] As a preferred technical scheme of the utility model, the inner layer pipe is made of titanium, stainless steel or corrosion-resistant copper alloy, which has good strength and corrosion resistance. The outer layer pipe is made of copper or aluminum alloy for heat dissipation. The transition layer is applied to the surface of the inner layer pipe by brushing, immersion, spraying or electroplating, so as to prevent the generation of air gap due to the poor consistency of material performance and size during the preparation of the inner layer pipe and the outer layer pipe.

[0008] As a preferred technical scheme of the utility model, the inner wall of the inner layer pipe is provided with a second thread, which is used to improve the heat dissipation performance of the inner layer pipe and improve the heat transfer efficiency of the inner layer pipe to the transition layer and the outer layer pipe.

[0009] As a preferred technical scheme of the utility model, the inner wall of the inner layer pipe can also be smooth.

[0010] As a preferred technical scheme of the utility model, the outer wall of the outer layer pipe is provided with a first thread, and the second thread is used for increasing the contact area between the outer layer pipe and air and improving the heat dissipation performance of the outer layer pipe.

[0011] Compared with the prior art, the utility model has the beneficial effects that: through the design of the first thread and the second thread on the inner layer pipe and the outer layer pipe, the heat exchange performance of the pipe material is significantly enhanced, the high heat exchange requirement is met, the mechanical performance and corrosion resistance of the pipe material are increased through the combination of the double-layer structure and the thread design, the service life is prolonged, more severe environments are adapted, the inner layer pipe, the transition layer and the outer layer pipe metal are tightly combined together through diffusion effect by arranging the transition layer between the inner layer pipe and the outer layer pipe, and the gap between the inner layer and the outer layer is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a schematic view of the first thread structure inside the inner layer pipe of the utility model;

[0013] Fig. 2 It is a schematic view of the smooth structure inside the inner layer pipe of the utility model.

[0014] In the drawing: 1, inner layer pipe; 101, first thread; 2, transition layer; 3, outer layer pipe; 301, second thread. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model. Embodiment 1

[0016] As Figs. 1-2 shown, the utility model discloses a double-layer metal pipe material with thread structure adopts technical scheme, including inner layer pipe 1, the inner layer pipe 1 is smooth titanium alloy pipe, the inner wall of inner layer pipe 1 is smooth, the outer side of inner layer pipe 1 has outer layer pipe 3, the outer layer pipe 3 is TP2 outer thread copper pipe, the outer wall of outer layer pipe 3 is equipped with second thread 301, there is transition layer 2 between outer layer pipe 3 and inner layer pipe 1, the transition layer 2 is the alloy of inner layer pipe 1 and outer layer pipe 3, and is used for the heat exchange pipe material of central air conditioner. Example 2

[0017] The difference between this embodiment and Example 1 is that the inner layer pipe 1 is a smooth titanium alloy pipe, and the outer layer pipe 3 is an oxygen-free copper outer threaded copper pipe, which is used for heat exchange pipe material for marine ships. Example 3

[0018] The difference between this embodiment and Example 1 is that the inner layer pipe 1 is a smooth white copper alloy pipe, and the outer layer pipe 3 is an oxygen-free copper outer threaded copper pipe, which is used for heat exchange pipe material in the field of central air conditioning, etc. Example 4

[0019] The difference between this embodiment and Example 1 is that the inner layer pipe 1 is a white copper alloy pipe with a threaded structure, and the outer layer pipe 3 is an oxygen-free copper outer threaded copper pipe, which is used for heat exchange pipe material in the field of central air conditioning, etc. Example 5

[0020] The difference between this embodiment and Example 1 is that the inner layer pipe 1 is a smooth stainless steel pipe, and the outer layer pipe 3 is an oxygen-free copper outer threaded copper pipe, which is used for heat exchange pipe material for power generation in power plants. Example 6

[0021] The difference between this embodiment and Example 1 is that the inner layer pipe 1 is a smooth titanium alloy pipe, and the outer layer pipe 3 is an aluminum alloy outer threaded pipe, which is used for heat exchange pipe material for dehumidifiers.

[0022] The working principle of the utility model is: first, a transition layer 2 is covered on the outer surface of the inner layer pipe 1 by coating, immersion plating, spraying and the like, then the outer layer pipe 3 is sleeved on the inner layer pipe 1 with the transition layer 2, and the composite pipe is placed in a heating furnace for a certain time at a certain temperature, so that the inner layer pipe 1, the transition layer 2 and the outer layer pipe 3 are tightly combined together through diffusion effect, and gaps between the inner and outer layers are avoided.

[0023] The mechanical connection involved in the utility model is a common means adopted by those skilled in the art, and can be obtained by limited tests, which belongs to the public knowledge.

[0024] The components not described in detail in the text are prior art.

[0025] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A double-layer metal pipe with a threaded structure, characterized in that: The invention comprises an inner tube (1), an outer tube (3) outside the inner tube (1), the inner tube (1) and the outer tube (3) being made of different metals, the inner tube (1) having a second thread (301) on its inner wall, the outer tube (3) having a first thread (101) on its outer wall, a transition layer (2) between the inner tube (1) and the outer tube (3), the transition layer (2) being made of the same metal as the inner tube (1) or an alloy of the inner tube (1) and the outer tube (3).

2. The double-layer metal pipe with a threaded structure according to claim 1, characterized in that: The inner wall of the inner layer tube (1) is smooth.

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