Partition type insulation internal fixing support for directly-buried thermal insulation pipe
By designing an internally fixed, partitioned insulating support for direct-buried insulated pipes, the problem of non-insulation between the outer protective pipe and the working pipe of direct-buried steam pipelines was solved, achieving insulation and heat insulation effects for the outer protective pipe, extending its service life and reducing the protection current requirement.
Patent Information
- Application Number
- CN202520514416.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-24
AI Technical Summary
The outer protective pipe of a directly buried steam pipeline is not insulated from the working pipe, which leads to the loss of cathodic protection current, excessive anode output current load, insufficient protection potential, accelerated corrosion rate, and shortened service life.
A direct-buried insulated pipe partition-type internal fixed support is designed. The steel pipe and the insulating connector are used to divide the two sides of the internal fixed support into two spaces through the thrust transmission, so that the outer protective pipe is insulated from the working pipe. The heat transfer distance is extended by using reducing diameter and tapered connecting pipes to increase the insulation effect. Insulating seals and fasteners are used to ensure the insulation.
It achieves insulation between the outer protective tube and the working tube, slows down corrosion, extends service life, improves polarization potential uniformity, reduces protection current requirements, and enhances heat insulation effect.
Smart Images
Figure CN223806837U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to direct -buried steam pipeline technical field, concretely relates to a direct -buried heat preservation pipe partition formula insulation inner fixed support. BACKGROUND
[0002] In recent years, as the city relevant department pays more and more attention to the city landscape, the prefabricated direct -buried steam pipeline is widely applied in the heating project, in order to reduce the corrosion, ensure the life of the outer protection pipe of direct -buried steam pipeline, the outer protection pipe of direct -buried steam pipeline adopts the outer anticorrosive coating, and at the same time, the cathodic protection measures should be taken. According to " Buried Steel Pipeline Cathodic Protection Technical Specification (GB / T21448-2017) ", the steel outer protection pipe should be insulated with the working pipe. But at present, the outer protection pipe and the working pipe are not insulated in the direct -buried steam pipeline system, and the main reason is that the outer protection pipe and the working pipe have metal structure connection in the inner fixed support pipe fitting, so that the grounding device of the outer protection pipe and the overhead section forms a conductive path, and the cathodic protection current of the steel outer protection pipe of direct -buried steam pipeline is lost through the working pipe and the grounding device, which not only causes the excessive load of anode output current, and the protection potential polarization is not high, and the predetermined protection requirement is not reached, but also greatly shortens the service life of the sacrificial anode. The protection potential of the steel outer protection pipe of direct -buried steam pipeline is not enough, and even loses the cathodic protection, which will accelerate the corrosion speed and shorten the service life. CONTENT OF THE UTILITY MODEL
[0003] Based on the above description, the utility model provides a direct -buried heat preservation pipe partition formula insulation inner fixed support to solve the problems, such as insufficient protection potential of the steel outer protection pipe of direct -buried steam pipeline in the related art, accelerated corrosion speed and shortened service life.
[0004] The utility model solves the technical scheme as follows: a direct -buried heat preservation pipe partition formula insulation inner fixed support, which comprises a working pipe, an outer protection pipe and a thrust transmission steel pipe, the outer protection pipe is sleeved on the outside of the working pipe, one end of the thrust transmission steel pipe is connected to the working pipe through a first connecting pipe, the other end of the thrust transmission steel pipe is connected to a second connecting pipe through an insulation connecting piece, and the other end of the second connecting pipe is connected to the outer protection pipe.
[0005] On the basis of the above technical scheme, the utility model can also be improved as follows.
[0006] Further, the first connecting pipe is a reducing pipe, and the diameter of one end of the first connecting pipe connected to the working pipe is smaller than the diameter of one end of the first connecting pipe connected to the thrust transmission steel pipe.
[0007] Further, the first connecting pipe is tapered, and the diameter of the first connecting pipe gradually expands from one end connected to the working pipe to one end connected to the thrust transmission steel pipe.
[0008] Further, the thrust transmission steel pipe is connected to the short pipe through an insulation connector, the short pipe has the same diameter as the thrust transmission steel pipe, and the short pipe is connected to the second connecting pipe.
[0009] Further, the second connecting pipe is a reducing pipe, the diameter of one end of the short pipe connected to the second connecting pipe is smaller than the diameter of one end of the outer protective pipe connected to the second connecting pipe.
[0010] Further, the second connecting pipe is tapered, and the diameter of the second connecting pipe gradually increases from the end connected to the short pipe to the end connected to the outer protective pipe.
[0011] Further, the insulation connector comprises two flanges connected to the thrust transmission steel pipe and the short pipe respectively, an insulation sealing element is arranged between the two flanges, the two flanges are fixed through bolts and nuts, and fastener insulation parts are arranged between the bolts, the nuts and the flanges.
[0012] Further, the overall length of the first connecting pipe, the thrust transmission steel pipe, the short pipe and the second connecting pipe is greater than or equal to 1.3 m.
[0013] Further, the outer protective pipe is fixed with a moisture discharge pipe, and the outer side of the moisture discharge pipe is fixed with a moisture discharge pipe outer protective pipe.
[0014] Further, the outer sides of the outer protective pipe and the moisture discharge pipe outer protective pipe are provided with anticorrosive layers.
[0015] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:
[0016] By connecting one end of the thrust transmission steel pipe to the working pipe through the first connecting pipe and connecting the other end to the second connecting pipe through the insulation connector, and connecting the other end of the second connecting pipe to the outer protective pipe, the two sides of the inner fixed support can be separated into two spaces, the outer protective pipe and the working pipe are insulated, a uniform polarization potential can be obtained with a small protection current, an economic and effective protection effect is achieved, the corrosion of the outer protective pipe is slowed down, and the heat transfer distance is long, and the insulation connector is heat-insulating, so that the overall heat insulation effect of the inner fixed support is good. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The overall structure schematic diagram of the straight-buried heat preservation pipe partition type insulation inner fixed support provided by the present application embodiment is shown in the figure;
[0018] Figure 2 The Figure 1 The sectional view of A-A in the figure;
[0019] Figure 3 The Figure 1 The enlarged view of I area in the figure.
[0020] In the drawings, the components represented by the reference numbers are listed as follows:
[0021] 1, working pipe; 2, outer protective pipe; 3, thrust transmission steel pipe; 4, first connecting pipe; 5, short pipe; 6, second connecting pipe; 7, moisture discharge pipe outer protective pipe; 8, moisture discharge pipe; 9, bolt; 10, nut; 11, insulation sealing element; 12, fastener insulation part; 13, gasket; 14, flange. DETAILED DESCRIPTION
[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0023] The utility model embodiment provides a kind of straight-buried thermal insulation pipe partition type insulation inner fixed support, can solve the problem of insufficient protection potential of straight-buried steam pipeline steel outer protective pipe in relevant technology, accelerate corrosion rate, shorten service life.
[0024] Referring to Figure 1 And Figure 2 As shown in the utility model embodiment provides a kind of straight-buried thermal insulation pipe partition type insulation inner fixed support, it can include working pipe 1, outer protective pipe 2 and thrust transmission steel pipe 3;The outer protective pipe 2 is set on the outside of the working pipe 1, one end of the thrust transmission steel pipe 3 is connected to the working pipe 1 by the first connecting pipe 4, the other end of the thrust transmission steel pipe 3 is connected to the second connecting pipe 6 by the insulation connecting piece, the other end of the second connecting pipe 6 is connected to the outer protective pipe 2.
[0025] Specifically, taking the pipeline of D478x9 as an example, one end of the thrust transmission steel pipe 3 is welded and connected with the working pipe 1 of higher temperature through the first connecting pipe 4, the temperature of the other end of the thrust transmission steel pipe 3 gradually decreases with the increase of its length, and after the temperature decreases below the use temperature of the insulation connecting piece, the other end of the thrust transmission steel pipe 3 is welded with the insulation connecting piece, and the other side of the insulation connecting piece is welded and connected with the inner side of the outer protective pipe 2 through the short pipe 5 and the second connecting pipe 6 in sequence;The heat transfer distance of this structure is long, and the insulation connecting piece is also heat-insulated, so that the overall heat insulation effect of the inner fixed support is good. This structure not only separates the inner fixed support into two spaces, but also insulates the outer protective pipe 2 from the working pipe 1, so that the outer protective pipe 2 has good insulation to ground and to non-protected pipe section. A uniform polarization potential can be obtained with a smaller protection current, an economic and effective protection effect is achieved, the corrosion of the outer protective pipe is slowed down, and the service life is guaranteed.
[0026] Referring to Figure 1As shown in the drawings, in some embodiments, the first connecting pipe 4 is a reducing pipe, the diameter of the end of the first connecting pipe 4 connected to the working pipe 1 is smaller than the diameter of the end of the first connecting pipe 4 connected to the thrust transmission steel pipe 3, in this embodiment, the reducing first connecting pipe 4 has a longer length than the straight piece type connecting piece vertically connected between the working pipe 1 and the thrust transmission steel pipe 3, which can further prolong the heat transfer distance of the working pipe 1 and the outer protective pipe 2 and improve the heat insulation effect.
[0027] Referring to Figure 1 As shown in the drawings, in some embodiments, the first connecting pipe 4 is tapered, the diameter of the first connecting pipe 4 gradually increases from the end connected to the working pipe 1 to the end connected to the thrust transmission steel pipe 3, which can further prolong the heat transfer distance of the working pipe 1 and the outer protective pipe 2 and improve the heat insulation effect, and the tapered connecting pipe has a simple production process and reduces the cost.
[0028] Referring to Figure 1 As shown in the drawings, in some embodiments, the thrust transmission steel pipe 3 is connected to the short pipe 5 through an insulating connecting piece, the diameter of the short pipe 5 is equal to the diameter of the thrust transmission steel pipe 3, and the short pipe 5 is connected to the second connecting pipe 6, in this embodiment, the insulating connecting piece is connected to the second connecting pipe 6 through the short pipe 5, and the short pipe 5 plays a transition role, which reduces the connection difficulty of the insulating connecting piece and the second connecting pipe 6.
[0029] Referring to Figure 1 As shown in the drawings, in some embodiments, the second connecting pipe 6 is a reducing pipe, the diameter of the end of the second connecting pipe 6 connected to the short pipe 5 is smaller than the diameter of the end of the second connecting pipe 6 connected to the outer protective pipe 2, in this embodiment, the reducing second connecting pipe 6 has a longer length than the straight piece type connecting piece vertically connected between the short pipe 5 and the outer protective pipe 2, which can further prolong the heat transfer distance of the working pipe 1 and the outer protective pipe 2 and improve the heat insulation effect.
[0030] Referring to Figure 1 As shown in the drawings, in some embodiments, the second connecting pipe 6 is tapered, the diameter of the second connecting pipe 6 gradually increases from the end connected to the short pipe 5 to the end connected to the outer protective pipe 2, which can further prolong the heat transfer distance of the working pipe 1 and the outer protective pipe 2 and improve the heat insulation effect, and the tapered connecting pipe has a simple production process and reduces the cost.
[0031] Referring to Figure 3As shown in the drawings, in some embodiments, the insulating connecting piece comprises two flanges 14 connected to the thrust transmission steel pipe 3 and the short pipe 5 respectively, an insulating sealing piece 11 is arranged between the two flanges 14, the two flanges 14 are fixed through bolts 9 and nuts 10, and fastener insulating parts 12 are arranged between the bolts 9, the nuts 10 and the flanges 14, in the embodiment, the fastener insulating parts 12 are sleeved outside the bolts 9, the bolts 9 and the fastener insulating parts 12 pass through the two flanges 14 and the insulating sealing piece 11, and the bolts 9 and the fastener insulating parts 12 play the role of fastening while ensuring the insulation between the two flanges 14 and between the flanges 14 and the bolts 9.
[0032] Referring to Figure 1 As shown in the drawings, in some embodiments, the included angle between the first connecting pipe 4 and the thrust transmission steel pipe 3 is preferably less than or equal to 20°, the included angle between the short pipe 5 and the second connecting pipe 6 is preferably less than or equal to 20°, and the overall length of the first connecting pipe 4, the thrust transmission steel pipe 3, the short pipe 5 and the second connecting pipe 6 is greater than or equal to 1.3 m, the heat transfer distance is longer, the heat insulation effect is better, meanwhile, the inner fixation support is divided into two spaces on both sides, and the insulation effect is good.
[0033] Referring to Figure 1 As shown in the drawings, in some embodiments, the outer protective pipe 2 is fixed with a moisture discharge pipe 8, and the outer side of the moisture discharge pipe 8 is fixed with a moisture discharge pipe outer protective pipe 7, so that water vapor can be discharged conveniently. The outer sides of the outer protective pipe 2 and the moisture discharge pipe outer protective pipe 7 are provided with anticorrosive layers, and the anticorrosive effect is good.
[0034] The manufacturing steps of the straight-buried heat preservation pipe partition type insulating inner fixation support provided by the embodiment of the utility model are as follows:
[0035] S1, as Figure 1 shown in the drawings, the big head of the first connecting pipe 4 is welded and connected with the thrust transmission steel pipe 3, and the other end of the thrust transmission steel pipe 3 is welded and connected with the flange 14; the small head of the second connecting pipe 6 is welded and connected with the short pipe 5, and the other end of the short pipe 5 is welded and connected with the flange 14.
[0036] S2, as Figure 3 shown in the drawings, the insulating sealing piece 11 is arranged between the two flanges 14; the bolt 9 is sleeved with the gasket 13 first, then the fastener insulating part 12 is sleeved, the bolt hole of the flange 14 is penetrated, the nut 10 is installed and screwed to reach the pre-tightening force of the insulating sealing piece 11, the connecting and fixing piece connecting the working pipe 1 and the outer protective pipe 2 is formed, and the overall length is not less than 1300 mm.
[0037] S3, after the heat preservation layer of the working pipe 1 is wound, the outer diameter of the heat preservation layer is slightly smaller than the inner diameter of the short pipe 5, the member manufactured in the second step is inserted, and the small head of the first connecting pipe 4 is welded and fixed with the working pipe 1.
[0038] S4, after the thermal insulation layer of the second step component is wound, the outer diameter of the thermal insulation layer is slightly smaller than the inner diameter of the outer protective tube 2, and the second connecting tube 6 is inserted into the outer protective tube 2 and welded firmly with the inner side of the outer protective tube 2.
[0039] S5, the moisture discharge pipe 8 and the moisture discharge pipe outer protective tube 7 are welded.
[0040] S6, the outer anticorrosive layer of the outer protective tube 2 and the moisture discharge pipe outer protective tube 7 is completed.
[0041] 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. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.
[0042] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over in use, a relative preposition such as "below" can be oriented upward, rather than downward. Accordingly, the exemplary terms "below" and "above" can encompass both an orientation of above and below. Moreover, the device can be otherwise oriented (for example, rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.
[0043] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over in use, a relative preposition such as "below" can be oriented upward, rather than downward. Accordingly, the exemplary terms "below" and "above" can encompass both an orientation of above and below. Moreover, the device can be otherwise oriented (for example, rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.
[0044] As used herein, the singular form "a", "an" and "the" include plural references unless the context clearly dictates otherwise. It is also to be understood that the term "including" or "comprising" or "having" and the like, means the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
[0045] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A straight-buried thermal insulation pipe partition type insulation inner fixing support, characterized in that, It includes a working pipe (1), an outer protective pipe (2) and a thrust transmission steel pipe (3); The outer protective pipe (2) is sleeved outside the working pipe (1), one end of the thrust transmission steel pipe (3) is connected to the working pipe (1) through a first connecting pipe (4), the other end of the thrust transmission steel pipe (3) is connected to a second connecting pipe (6) through an insulation connecting piece, the other end of the second connecting pipe (6) is connected to the outer protective pipe (2).
2. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 1, characterized in that: The first connecting pipe (4) is a reducing pipe, the diameter of the end of the first connecting pipe (4) connected to the working pipe (1) is smaller than the diameter of the end of the first connecting pipe (4) connected to the thrust transmission steel pipe (3).
3. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 2, characterized in that: The first connecting pipe (4) is tapered, the diameter of the first connecting pipe (4) gradually increases from the end connected to the working pipe (1) to the end connected to the thrust transmission steel pipe (3).
4. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 1, characterized in that: The thrust transmission steel pipe (3) is connected to a short pipe (5) through an insulation connecting piece, the diameter of the short pipe (5) is equal to the diameter of the thrust transmission steel pipe (3), and the short pipe (5) is connected to the second connecting pipe (6).
5. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 4, characterized in that: The second connecting pipe (6) is a reducing pipe, the diameter of the end of the second connecting pipe (6) connected to the short pipe (5) is smaller than the diameter of the end of the second connecting pipe (6) connected to the outer protective pipe (2).
6. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 5, characterized in that: The second connecting pipe (6) is tapered, the diameter of the second connecting pipe (6) gradually increases from the end connected to the short pipe (5) to the end connected to the outer protective pipe (2).
7. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 4, characterized in that: The insulation connecting piece includes two flanges (14) connected to the thrust transmission steel pipe (3) and the short pipe (5) respectively, an insulation sealing piece (11) is arranged between the two flanges (14), the two flanges (14) are fixed through bolts (9) and nuts (10), and fastener insulation parts (12) are arranged between the bolts (9), the nuts (10) and the flanges (14).
8. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 4, characterized in that: The overall length of the first connecting pipe (4), the thrust transmission steel pipe (3), the short pipe (5) and the second connecting pipe (6) is greater than or equal to 1.3 m.
9. The straight-buried heat-preservation pipe partition type insulation inner fixed support according to claim 1, characterized in that: A moisture discharge pipe (8) is fixed on the outer protective pipe (2), and a moisture discharge pipe outer protective pipe (7) is fixed on the outside of the moisture discharge pipe (8).
10. The fixed support according to claim 9, characterized in that: The outer side of the outer protective tube (2) and the moisture drainage tube outer protective tube (7) is provided with a corrosion-resistant layer.