Inner fixing joint of steel-in-steel steam thermal insulation pipe

Abstract

The utility model discloses an inner fixing joint of a steel-in-steel steam thermal insulation pipe, which belongs to the technical field of steel-in-steel steam thermal insulation pipes and comprises a working steel pipe and a first outer protective steel pipe sleeved outside the working steel pipe, a second outer protective steel pipe is arranged outside the first outer protective steel pipe, and a fixing structure is arranged between the working steel pipe and the first outer protective steel pipe. A first heat preservation layer is arranged between the working steel pipe and the first outer protection steel pipe except the fixing structure, and a second heat preservation layer is arranged between the first outer protection steel pipe and the second outer protection steel pipe. The fixing structure comprises an inner pressing ring, an outer pressing ring and a high-strength heat insulation ring arranged between the inner pressing ring and the outer pressing ring, the inner pressing ring is arranged on the outer wall of the working steel pipe, the outer pressing ring is arranged on the inner wall of the first outer protective steel pipe, the inner pressing ring does not make contact with the inner wall of the outer protective pipe, and the outer pressing ring does not make contact with the outer wall of the working steel pipe. According to the utility model, heat loss can be avoided while relative displacement between the working steel pipe and the first outer protective steel pipe is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steel sleeve steel vapor heat preservation pipe technical field, concretely relates to a kind of steel sleeve steel vapor heat preservation pipe inner fixed node. BACKGROUND

[0002] The statements herein are provided only to aid in the understanding of the present utility model, and do not necessarily constitute the prior art.

[0003] Steel sleeve steel vapor heat preservation pipe is a kind of special heat preservation pipe, its transmission medium is mainly steam, and with the increase of current heating pipe network, the demand for steel sleeve steel vapor heat preservation pipe is also rapidly increasing, and steel sleeve steel inner fixed node is often used in steel sleeve steel vapor heat preservation pipe construction, which is mainly used to ensure that there is no relative displacement between working steel pipe and first outer protective steel pipe at the set pipeline point. To ensure that there is no displacement between working steel pipe and first outer protective steel pipe, they are usually connected using rigid materials (steel materials), but this method will cause heat loss through rigid connection, affecting the heat preservation effect of heat preservation pipe.

[0004] In addition, since the drainage structure and the moisture removal structure should be arranged close to the inner fixed node according to the design requirements, the existing inner fixed node with moisture removal or drainage structure will also cause heat loss. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of steel sleeve steel vapor heat preservation pipe inner fixed node, by increasing heat preservation layer and the rigid connection between the fixed working steel pipe and first outer protective steel pipe, it is guaranteed that there is no relative displacement between working steel pipe and first outer protective steel pipe while avoiding heat loss.

[0006] To achieve the above-mentioned purpose, the utility model is realized by the following technical solutions:

[0007] Firstly, the embodiments of the utility model provide a kind of steel sleeve steel vapor heat preservation pipe inner fixed node, including working steel pipe and the first outer protective steel pipe of sleeve setting in the outside of working steel pipe, the outside of first outer protective steel pipe is equipped with second outer protective steel pipe, fixed structure is equipped between working steel pipe and first outer protective steel pipe, first heat preservation layer is equipped between working steel pipe and first outer protective steel pipe except fixed structure, second heat preservation layer is equipped between first outer protective steel pipe and second outer protective steel pipe;

[0008] The fixed structure includes inner pressure ring, outer pressure ring and high-strength heat insulation ring arranged between inner pressure ring and outer pressure ring, the inner pressure ring is arranged on the outer wall of working steel pipe, the outer pressure ring is arranged on the inner wall of first outer protective steel pipe, the inner pressure ring does not contact with the inner wall of outer protective pipe, and the outer pressure ring does not contact with the outer wall of working steel pipe.

[0009] As a further technical solution, the inner pressure ring is provided with two, and the two inner pressure rings are connected by an inner rib; the outer pressure ring is provided with two, which are respectively arranged outside the two inner pressure rings, and two high-strength heat insulation rings are respectively arranged between the two outer pressure rings and the two inner pressure rings.

[0010] As a further technical solution, the two outer pressure rings are respectively provided with a rib plate on both sides, and one side of the rib plate is connected with the first outer protective steel pipe.

[0011] As a further technical solution, the inner rib is provided with a plurality of inner ribs, which are uniformly distributed along the circumference of the working steel pipe.

[0012] As a further technical solution, the inner rib is provided with a plurality of inner ribs, which are uniformly distributed along the circumference of the working steel pipe.

[0013] As a further technical solution, the height of the high-strength heat insulation ring is consistent with the height of the first heat preservation layer.

[0014] As a further technical solution, the first heat preservation layer comprises a nano-porous aerogel felt, an aluminum foil glass fiber cloth and a high-temperature resistant cotton felt; the outer wall of the working steel pipe is provided with a nano-porous aerogel felt, and the outer wall of the working steel pipe is provided with an aluminum foil glass fiber cloth and a high-temperature resistant cotton felt; the outer pressure ring is in contact with the nano-porous aerogel felt arranged on the outer wall of the working steel pipe.

[0015] As a further technical solution, the second heat preservation layer comprises a high-temperature resistant cotton felt and an aluminum foil glass fiber cloth.

[0016] As a further technical solution, the second outer protective steel pipe is connected with the first outer protective steel pipe through rolling and reducing.

[0017] As a further technical solution, the second outer protective steel pipe is provided with a hydrophobic working steel pipe and a moisture-removing working steel pipe; a hydrophobic outer protective steel pipe is arranged outside the hydrophobic working steel pipe, and a moisture-removing outer protective steel pipe is arranged outside the moisture-removing working steel pipe.

[0018] The beneficial effects of the above-mentioned embodiments of the present application are as follows:

[0019] Firstly, the steel-cased steel steam heat preservation pipe inner fixing joint provided by the present application increases the heat preservation layer and separates the rigid connection between the working steel pipe and the first outer protective steel pipe, so as to ensure that there is no relative displacement between the working steel pipe and the first outer protective steel pipe and to avoid heat loss.

[0020] Among them, the structure of the outer pressure ring, the inner pressure ring and the high-strength heat insulation ring can not only avoid the axial displacement of the working steel pipe due to thermal expansion and contraction, but also can block the heat transfer and dissipation along the inner pressure ring through the high-strength heat insulation ring, thereby reducing heat loss.

[0021] At the same time, the tool of the second outer protective steel pipe is used, the heat preservation thickness of the inner pressure ring is increased, and heat loss of the working steel pipe through the inner pressure ring is further avoided;

[0022] In addition, the working steel pipe is provided with two left and right inner pressure rings, and the two inner pressure rings are connected through inner ribs, so that the welding strength of the pressure ring and the working steel pipe is enhanced, and the pressure ring is prevented from being deformed under a large displacement strength. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the present application, and are incorporated herein by reference. The present application may be understood by a description in connection with the accompanying drawings, together with the following detailed description, which is not intended to limit the present application.

[0024] Figure 1 It is an inner fixed joint of a steel sleeve steel steam heat preservation pipe provided in embodiment 1 of the present application.

[0025] The schematic view is only used for illustration;

[0026] 1, working steel pipe; 2, nano-porous aerogel felt; 3, high-temperature-resistant cotton felt; 4, first outer protective steel pipe; 5, rolled variable diameter; 6, second outer protective steel pipe; 7, left outer rib plate; 8, left outer pressure ring; 9, left inner pressure ring; 10, inner rib; 11, high-strength heat insulation ring; 12, moisture removal working steel pipe; 13, moisture removal outer protective steel pipe; 14, aluminum foil glass fiber cloth; 15, right inner pressure ring; 16, right outer pressure ring; 17, right outer rib plate; 18, hydrophobic working steel pipe; 19, hydrophobic outer protective steel pipe. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0028] Embodiment 1

[0029] In a typical embodiment of the present application, as shown in Figure 1 A typical embodiment of the present application is provided, which is an inner fixed joint of a steel sleeve steel steam heat preservation pipe, comprising a working steel pipe 1 and a first outer protective steel pipe 4 sleeved outside the working steel pipe 1, a second outer protective steel pipe 6 is arranged outside the first outer protective steel pipe 4, a fixed structure is arranged between the working steel pipe 1 and the first outer protective steel pipe 4, a first heat preservation layer is arranged between the working steel pipe 1 and the first outer protective steel pipe 4 except the fixed structure, and a second heat preservation layer is arranged between the first outer protective steel pipe 4 and the second outer protective steel pipe 6.

[0030] The fixing structure comprises an inner pressure ring, an outer pressure ring and a high-strength heat insulation ring 11 arranged between the inner pressure ring and the outer pressure ring, the inner pressure ring is arranged on the outer wall of the working steel pipe 1, the outer pressure ring is arranged on the inner wall of the first outer protective steel pipe 4, the inner pressure ring is not in contact with the inner wall of the outer protective pipe, and the outer pressure ring is not in contact with the outer wall of the working steel pipe 1.

[0031] In the embodiment, the left inner pressure ring 9 and the right inner pressure ring 15 are welded in the working steel pipe 1, and the left inner pressure ring 9 and the right inner pressure ring 15 are connected through the welded inner rib 10, and the left and right inner pressure rings 15 connected through the inner rib 10 can provide the welding strength of the inner pressure ring and the working steel pipe 1.

[0032] The first outer protective steel pipe 4 is welded with the left outer pressure ring 8 and the right outer pressure ring 16, and the left outer pressure ring 8 and the right outer pressure ring 16 are welded with the left outer rib plate 7 and the right outer rib plate 17 respectively. The outer rib plate is used to improve the welding strength of the left outer pressure ring 8 and the right outer pressure ring 16 and the first outer protective steel pipe 4.

[0033] In the working steel pipe 1 and the first outer protective steel pipe 4, the fixing structure between the left outer pressure ring 8 and the right outer pressure ring 16 is excluded, and the rest of the positions are laid with the first heat insulation layer according to the requirements of the customer, and the first heat insulation layer mainly comprises the nano-porous aerogel felt 2 (in other embodiments, the high-temperature-resistant cotton felt 3 can also be used according to the design requirements), the aluminum foil glass fiber cloth 14 and the high-temperature-resistant cotton felt 3, and normal heat insulation is performed.

[0034] Through the fixing structure composed of the inner pressure ring, the outer pressure ring and the high-strength heat insulation ring 11, the inner and outer pressure rings are separated by the high-strength heat insulation ring 11, and heat cannot be directly transmitted to the first outer protective steel pipe 4 through the inner and outer pressure rings, thereby reducing heat loss.

[0035] Further, the inner pressure ring is provided with two inner pressure rings connected through the inner rib 10; the outer pressure ring is provided with two outer pressure rings arranged outside the two inner pressure rings, and two high-strength heat insulation rings 11 are arranged between the two outer pressure rings and the two inner pressure rings.

[0036] In the embodiment, the left outer pressure ring 8 and the left inner pressure ring 9, and the right outer pressure ring 16 and the right inner pressure ring 15 are both provided with the high-strength heat insulation ring 11, and the two are in tight fit. When the temperature of the working steel pipe 1 changes during the heating process, the axial displacement formed by the thermal expansion and contraction of the steel pipe will be transmitted to the outer pressure ring through the high-strength heat insulation ring 11 by the inner pressure ring, and then transmitted to the first outer protective steel pipe 4 by the outer pressure ring, thereby positioning the working steel pipe 1.

[0037] Further, the two outer pressure rings are provided with rib plates on both sides. The left and right outer pressure rings 16 are welded to the inner wall of the first outer protective steel pipe 4, and outer rib plates are welded to the outer sides of the two outer pressure rings, one side of the outer rib plate being welded to the first outer protective steel pipe 4. The same purpose is to increase the welding strength of the outer pressure ring and the first outer protective steel pipe 4, and to prevent the working steel pipe 1 from moving due to thermal expansion.

[0038] Further, the inner rib 10 is provided with a plurality of uniformly distributed along the circumference of the working steel pipe 1. The working steel pipe 1 is provided with left and right inner pressure rings, which are connected by the inner rib 10 to enhance the connection strength of the inner pressure ring and the working steel pipe 1, prevent deformation of the single inner pressure ring during use, and cause displacement of the working steel pipe 1 and the first outer protective steel pipe 4. The inner rib 10 is uniformly distributed along the circumference, and the number of distribution can be 3-12.

[0039] Further, the inner rib 10 is provided with a nano-porous aerogel felt 2 on one side close to the working steel pipe 1, and a high-temperature-resistant cotton felt 3 and an aluminum foil glass fiber cloth 14 on the other side close to the first outer protective steel pipe 4. The inner rib 10 is laid with a nano-porous aerogel felt 2 (according to the design requirements, a high-temperature-resistant cotton felt 3 can also be used) below, and a high-temperature-resistant cotton felt 3 and an aluminum foil glass fiber cloth 14 above, to increase the heat preservation effect in the radial direction of the inner rib 10.

[0040] Further, the height of the high-strength heat insulation ring 11 is consistent with the height of the first heat preservation layer. The height of the high-strength heat insulation ring 11 is the same as the thickness of the first heat preservation layer between the working steel pipe 1 and the first outer protective steel pipe 4, on the one hand to ensure the heat preservation effect, and on the other hand to avoid axial displacement, uneven stress on the inner and outer pressure rings, and tilting or damage caused by small stress area of the heat insulation ring.

[0041] Further, the first heat preservation layer includes a nano-porous aerogel felt 2, an aluminum foil glass fiber cloth 14 and a high-temperature-resistant cotton felt 3; the outer wall of the working steel pipe 1 is provided with a nano-porous aerogel felt 2, and the outer part of the nano-porous aerogel felt 2 is provided with an aluminum foil glass fiber cloth 14 and a high-temperature-resistant cotton felt 3; the outer pressure ring is in contact with the nano-porous aerogel felt 2 provided on the outer wall of the working steel pipe 1.

[0042] Further, the second heat preservation layer includes a high-temperature-resistant cotton felt 3 and an aluminum foil glass fiber cloth 14.

[0043] Further, the second outer protective steel pipe 6 is connected to the first outer protective steel pipe 4 through the coiled reducing 5. In this embodiment, the first outer protective steel pipe 4 is additionally provided with the second outer protective steel pipe 6, which is connected to the first outer protective steel pipe 4 through the coiled reducing 5, and the second outer protective steel pipe 6 and the first outer protective steel pipe 4 are provided with a high-temperature-resistant cotton felt 3 and an aluminum foil glass fiber cloth 14. By adding the second outer protective steel pipe 6, the thickness of the inner fixed heat preservation layer is increased, thereby avoiding heat loss.

[0044] Further, the second outer protective steel pipe 6 is externally provided with a dehumidification working steel pipe 18 and a moisture discharge working steel pipe 12; the dehumidification working steel pipe 18 is externally provided with a dehumidification outer protective steel pipe 19, and the moisture discharge working steel pipe 12 is externally provided with a moisture discharge outer protective steel pipe 13. In this way, by additionally arranging the second outer protective steel pipe 6 and externally arranging the dehumidification working steel pipe 18 and the moisture discharge working steel pipe 12 on the second outer protective steel pipe 6, the heat loss of the dehumidification device and the dehumidification device can be reduced, and the dehumidification outer protective steel pipe 19 arranged on the dehumidification working steel pipe 18 and the moisture discharge outer protective steel pipe 13 arranged on the moisture discharge working steel pipe 12 can protect the pipeline structure from being damaged.

[0045] The steel sleeve steam heat preservation pipe inner fixing joint provided by the utility model can ensure that there is no relative displacement between the working steel pipe and the first outer protective steel pipe and avoid heat loss by increasing the heat preservation layer and the rigid connection between the working steel pipe and the first outer protective steel pipe;

[0046] The structure of the outer pressure ring, the inner pressure ring and the high-strength heat insulation ring can ensure that the axial displacement of the working steel pipe caused by thermal expansion and cold contraction is avoided, and the heat is blocked when being transmitted and dissipated along the inner pressure ring by the high-strength heat insulation ring, thereby reducing heat loss;

[0047] The heat loss of the working steel pipe through the inner pressure ring is further avoided by increasing the heat preservation thickness of the inner pressure ring by using the tooling of the second outer protective steel pipe;

[0048] In addition, the working steel pipe is provided with two left and right inner pressure rings connected by inner ribs, so that the welding strength of the pressure ring and the working steel pipe is enhanced, and the pressure ring will not be deformed under a large displacement strength.

[0049] The above only describes preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can be changed and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steel-encased steam heat preservation pipe inner fixing joint, characterized in that, The working steel pipe and the first outer protective steel pipe are sleeved outside the working steel pipe, the first outer protective steel pipe is externally provided with the second outer protective steel pipe, the fixed structure is arranged between the working steel pipe and the first outer protective steel pipe, the first heat preservation layer is arranged between the working steel pipe and the first outer protective steel pipe except the fixed structure, and the second heat preservation layer is arranged between the first outer protective steel pipe and the second outer protective steel pipe. The fixed structure comprises an inner pressing ring, an outer pressing ring and a high-strength heat insulation ring arranged between the inner pressing ring and the outer pressing ring, the inner pressing ring is arranged on the outer wall of the working steel pipe, the outer pressing ring is arranged on the inner wall of the first outer protective steel pipe, the inner pressing ring is not in contact with the inner wall of the outer protective pipe, and the outer pressing ring is not in contact with the outer wall of the working steel pipe.

2. A steel- over- steel vapor barrier pipe inner fixture according to claim 1, characterized in that, The inner pressing ring is provided with two inner pressing rings which are connected through an inner rib, the outer pressing ring is provided with two outer pressing rings which are arranged outside the two inner pressing rings respectively, and two high-strength heat insulation rings are arranged between the two outer pressing rings and the two inner pressing rings respectively.

3. A steel- over- steel vapor barrier pipe inner fixture according to claim 2, characterized in that, The two outer pressing rings are respectively provided with a rib plate on the two sides, and one side of the rib plate is connected with the first outer protective steel pipe.

4. A steel-in-steel vapor barrier pipe inner stationary joint as defined in Claim 2, wherein The inner rib is provided with a plurality of inner ribs which are uniformly distributed along the circumference of the working steel pipe.

5. A steel- over- steel vapor barrier pipe inner fixture according to claim 4, characterized in that, The side of the inner rib close to the working steel pipe is provided with a nanopore aerogel felt, and the side of the inner rib close to the first outer protective steel pipe is provided with a high-temperature-resistant cotton felt and an aluminum foil glass fiber cloth.

6. A steel- over- steel vapor barrier pipe interior fitting, as described in claim 2, wherein, The height of the high-strength heat insulation ring is consistent with the height of the first heat preservation layer.

7. A steel- over- steel vapor barrier pipe inner service joint as defined in Claim 1 wherein, The first heat preservation layer comprises a nanopore aerogel felt, an aluminum foil glass fiber cloth and a high-temperature-resistant cotton felt, the outer wall of the working steel pipe is provided with the nanopore aerogel felt, the nanopore aerogel felt is externally provided with the aluminum foil glass fiber cloth and the high-temperature-resistant cotton felt, and the outer pressing ring is in contact with the nanopore aerogel felt arranged on the outer wall of the working steel pipe.

8. A steel- over- steel vapor barrier pipe inner main according to claim 1, wherein The second heat preservation layer comprises a high-temperature-resistant cotton felt and an aluminum foil glass fiber cloth.

9. A steel- over- steel vapor barrier pipe inner main according to claim 1, wherein The second outer protective steel pipe is connected with the first outer protective steel pipe through rolling and reducing.

10. The steel- over- steel vapor barrier pipe interior fitting of claim 1 wherein, The outer part of the second outer protective steel pipe is provided with a hydrophobic working steel pipe and a moisture-removing working steel pipe, a hydrophobic outer protective steel pipe is arranged outside the hydrophobic working steel pipe, and a moisture-removing outer protective steel pipe is arranged outside the moisture-removing working steel pipe.

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