CN212080469U - Bent structure of jacketed pipe - Google Patents
Bent structure of jacketed pipe Download PDFInfo
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- CN212080469U CN212080469U CN202020744550.5U CN202020744550U CN212080469U CN 212080469 U CN212080469 U CN 212080469U CN 202020744550 U CN202020744550 U CN 202020744550U CN 212080469 U CN212080469 U CN 212080469U
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Abstract
The utility model relates to a jacket sleeve elbow structure, include: an inner straight tube; the two ends of the inner pipe elbow are connected with the inner straight pipe, and the nominal diameter of the inner pipe elbow is the same as that of the inner straight pipe; an outer straight tube which is jacketed on the inner straight tube; the outer pipe elbow is sleeved on the inner pipe elbow, and the nominal diameter of the outer pipe elbow is larger than that of the outer straight pipe; the reducing pipe is distributed at two ends of the outer pipe elbow, the reducing pipe is provided with a small end and a large end, the large end of the reducing pipe is connected with the end face of the outer pipe elbow in an aligned mode, the small end of the reducing pipe is connected with the end face of the outer straight pipe in an aligned mode, and the reducing pipe is in a sectioning mode and plays a role in adjusting sections in the actual construction process. The utility model solves the problem of damage to the elbow of the outer pipe of the jacket caused by the influence of thermal stress; the utility model has low cost, the outer pipe elbow and the two reducing pipes belong to standard pipe fittings, and the cost is not increased; the utility model discloses can the on-the-spot assembly welding, do not need special purchase and nonstandard production, practice thrift the freight.
Description
Technical Field
The utility model relates to an elbow structure, more specifically relates to a jacket pipe elbow structure.
Background
In chemical plants, some process media need to reduce the loss of heat and cold during the transportation process, so that the requirements on process pipelines are very strict, and a jacket insulation mode is usually adopted.
Aiming at the heat insulation mode, the prior art is designed according to a curvature radius table of a jacket inner pipe and a sleeve elbow in SH/T3040-2012, and in the practical application process, the situation that the outer wall of the inner pipe impacts the inner wall of the outer pipe can be found when the inner pipe is not less than DN200 and the outer pipe is not less than DN250, so that the field installation is difficult. Especially in the installation of hot water, steam, flare line, etc. with high temperature, the thermal expansion amount is generated due to the heating of the metal line, and if the installation is performed according to the above-mentioned specifications, the collision is more serious, and even the occurrence of the seizure condition may be caused.
In addition, in the polyethylene device, the introduced process requires that the nominal diameter of the outer pipe is only one level larger than that of the inner pipe, and the elbow matching according to SH/T3040-2012 cannot be realized according to the requirement. In the past project, on the basis that the nominal diameter of the outer pipe is one level larger than that of the inner pipe, the 1.5D outer pipe elbow and the inner pipe elbow with the same curvature radius as the outer pipe elbow are designed, however, the inner pipe elbow designed in the way is a non-standard elbow, and the purchase cost is greatly increased.
Thus, the prior art jacket tube configurations suffer from inadequate specifications and high cost.
SUMMERY OF THE UTILITY MODEL
Between the inner and outer pipe bends of the jacketed pipe, relatively serious consequences can occur if there is not enough space. The inner pipe can generate thermal expansion at high temperature, but no redundant space is left at the elbow to allow the inner pipe to freely expand, so that the inner pipe can collide with the elbow of the outer pipe, and the welding seam of the elbow of the outer pipe can be seriously cracked, so that the pipeline fails. From this, in order to stop the emergence of the above condition, after a series of researches, the utility model designs a new double-layered sleeve pipe elbow structure replaces traditional double-layered sleeve pipe elbow, has solved the inapplicable matching relation in the standard to cost is reduced under the circumstances of guaranteeing safety, for example, the saving cost of a project can reach more than 100 ten thousand RMB.
To this end, the utility model discloses specifically adopt following technical scheme:
according to the utility model discloses an aspect provides a jacket pipe elbow structure, include:
an inner straight tube;
the two ends of the inner pipe elbow are connected with the inner straight pipe, and the nominal diameter of the inner pipe elbow is the same as that of the inner straight pipe;
an outer straight tube jacketed on the inner straight tube;
the outer pipe elbow is sleeved on the inner pipe elbow, and the nominal diameter of the outer pipe elbow is larger than that of the outer straight pipe;
the reducing pipe is distributed at two ends of the outer pipe elbow, the reducing pipe is provided with a small end and a large end, the large end of the reducing pipe is aligned and connected with the end face of the outer pipe elbow, and the small end of the reducing pipe is aligned and connected with the end face of the outer straight pipe.
In one embodiment of the present invention, the nominal diameter of the large end of the reducing pipe is the same as the nominal diameter of the outer pipe elbow, and the nominal diameter of the small end of the reducing pipe is the same as the nominal diameter of the outer straight pipe.
In one embodiment of the present invention, the nominal diameter of the reducing pipe gradually increases from the small end to the large end.
In one embodiment of the invention, the reducing pipe is formed in a throwing cut.
In one embodiment of the invention, the nominal diameter D of the inner pipe bend1Is in the range of 200mm to 400 mm.
In one embodiment of the invention, the nominal diameter D of the inner pipe bend1Is 200mm, 250mm, 300mm, 350mm or 400 mm.
In one embodiment of the invention, the radius of curvature R of the inner pipe bend1＝1.5D1。
In one embodiment of the invention, the nominal diameter D of the outer pipe bend2Is in the range of 300mm to 500 m.
In one embodiment of the invention, the nominal diameter D of the inner pipe elbow1Correspondingly, the nominal diameter D of the elbow of the outer tube2Is 300mm, 350mm, 400mm, 450mm or 550 mm.
In one embodiment of the invention, the radius of curvature R of the outer pipe bend2＝1.0D2。
By adopting the technical scheme, the utility model discloses compare and have following advantage in prior art:
(1) the utility model provides a damage that causes because of thermal stress influence to pressing from both sides cover outer tube elbow.
(2) The utility model discloses with low costs, outer tube elbow and two reducing pipes all belong to standard pipe fitting, do not increase the expense.
(3) The utility model discloses can the on-the-spot assembly welding, do not need special purchase and nonstandard production, practice thrift the freight.
Drawings
The above and/or additional aspects and advantages of the present invention will become more apparent and readily appreciated from the description of the embodiments taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic diagram of a jacketed pipe elbow structure provided by the present invention.
Description of the reference numerals
1 outer pipe elbow, 2 reducing pipes, 21 small end, 22 large end, 3 inner pipe elbow, 4 outer straight pipe, 5 inner straight pipe, R1Radius of curvature, R, of inner pipe bend2Radius of curvature of elbow of outer pipe
Detailed Description
It should be understood that the embodiments of the invention shown in the exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject invention. Accordingly, all such modifications are intended to be included within the scope of this invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters and the like of the following exemplary embodiments without departing from the spirit of the present invention.
The utility model provides a jacket pipe elbow structure, include: an inner straight tube; the two ends of the inner pipe elbow are connected with the inner straight pipe, and the nominal diameter of the inner pipe elbow is the same as that of the inner straight pipe; an outer straight tube jacketed on the inner straight tube; the outer pipe elbow is sleeved on the inner pipe elbow, and the nominal diameter of the outer pipe elbow is larger than that of the outer straight pipe; the reducing pipe is distributed at two ends of the outer pipe elbow, the reducing pipe is provided with a small end and a large end, the large end of the reducing pipe is aligned and connected with the end face of the outer pipe elbow, and the small end of the reducing pipe is aligned and connected with the end face of the outer straight pipe. The nominal diameter of the outer pipe elbow is enlarged, and the two ends of the outer pipe elbow are connected by the reducing pipes, so that the space between the inner pipe elbow and the outer pipe elbow is enlarged, namely, enough space exists between the inner pipe elbow and the outer pipe elbow, therefore, when the inner pipe is thermally expanded at high temperature, the inner pipe elbow can be freely expanded in the space, the collision between the outer wall of the inner pipe elbow and the inner wall of the outer pipe elbow can be avoided, the expansion crack at the welding position of the outer pipe elbow can be avoided, the normal and effective pipeline can be ensured, and the standard application and matching can be realized; and the inner tube elbow and the outer tube elbow designed by the utility model are both elbows with standard curvature radius, and the reducing pipe is also a standard part, thereby not increasing the cost and saving the cost.
In the above structure, the nominal diameter of the large end of the reducing pipe is the same as the nominal diameter of the elbow of the outer pipe, and the nominal diameter of the small end of the reducing pipe is the same as the nominal diameter of the outer straight pipe. Through the design of this structure, can be so that reducing pipe connects outer tube elbow and outer straight tube better.
In the above structure, the nominal diameter of the reducing pipe gradually increases from the small end to the large end.
In the above structure, the reducing pipe is formed in a form of a throw cut. The throwing-cutting type reducing pipe plays a role in reducing connection and adjusting the section.
In the above structure, the nominal diameter D of the elbow of the inner pipe1Is in the range of 200mm to 400 mm.
In the above structure, the nominal diameter D of the elbow of the inner pipe1Is 200mm, 250mm, 300mm, 350mm or 400 mm.
In the above structure, the radius of curvature R of the inner pipe bend1＝1.5D1。
In the above structure, the nominal diameter D of the elbow of the outer pipe2Is in the range of 300mm to 500 m.
In the above structure, the nominal diameter D of the elbow of the inner pipe1Correspondingly, the nominal diameter D of the elbow of the outer tube2Is 300mm, 350mm, 400mm, 450mm or 550 mm.
In the above structure, the radius of curvature R of the outer pipe bend2＝1.0D2。
The jacketed pipe elbow according to the present invention will be described with reference to fig. 1.
The principle premise of matching the traditional inner pipe elbow and the outer pipe elbow is to change the curvature radius of the outer pipe elbow for matching on the premise of ensuring the 1.5D curvature radius of the inner pipe elbow. Because the process media is transported due to pressure drop and other requirements, bends with a 1.0D radius of curvature are generally not used.
The utility model discloses the cover outer tube elbow structure that presss from both sides through transformation also goes on under the curvature radius prerequisite of guaranteeing inner tube elbow 1.5D. The space problem between the inner pipe elbow and the outer pipe elbow needs to be considered, and the elbow with the standard curvature radius is adopted as far as possible in order to reduce the cost, so that the nominal diameter of the outer pipe elbow is enlarged in the matching relation specified in the original specification, and specific data are shown in the following table 1.
The outer pipe elbow needs to be connected with a jacket pipeline, and reducing pipes need to be added at two ends respectively. In the jacket pipeline construction process, the outer pipe construction requirement has the adjustment section, combines the needs of this actual construction, consequently makes the reducing pipe into throwing the form of cutting, plays the effect of reducing connection effect again and plays the effect of adjustment section, kills two birds with one stone.
The utility model discloses a 3 standard components come to press from both sides the transformation that presss from both sides the cover outer tube elbow, form new 3 standard return bend structures, have solved all problems of prior art, the utility model provides a press from both sides sleeve pipe elbow concrete structure and see figure 1.
As shown in figure 1, the jacketed pipe elbow structure comprises an inner straight pipe 5, an inner pipe elbow 3, an outer straight pipe 4, an outer pipe elbow 1 and a reducing pipe 2, wherein the inner pipe elbow 3 is arranged between the two inner straight pipes 5, the nominal diameter of the inner pipe elbow 3 is the same as the nominal diameter of the inner straight pipes 5, the outer straight pipes 4 are sleeved on the inner straight pipes 5, the outer pipe elbow 1 is sleeved on the inner pipe elbow 3, the nominal diameter of the outer pipe elbow 1 is larger than the nominal diameter of the outer straight pipes 4, the two ends of the outer pipe elbow 1 are respectively provided with the reducing pipes 2, the reducing pipes 2 are provided with small ends 21 and large ends 22, the nominal diameter of the reducing pipes 2 is gradually increased from the small ends 21 to the large ends 22, the large ends 22 of the reducing pipes 2 are aligned and connected with the end surfaces of the outer pipe elbow 1, the small ends 21 of the reducing pipes 2 are aligned and connected with the end surfaces of the outer straight pipes 4, the nominal diameter of the large ends 22 of the reducing pipes 2, the nominal diameter of the small end 21 of the reducer 2 is the same as the nominal diameter of the outer straight pipe 4.
Preferably, in the above embodiment, the reducing pipe 2 is formed in a throw-cut type, and the throw-cut type reducing pipe functions as a reducing connection and as an adjustment section.
As shown in the following Table 1, the nominal diameter D of the inner pipe elbow of the present invention is obtained by the design of the structure of the present invention1Can be 200mm, 250mm, 300mm, 350mm or 400mm and ensures the curvature radius R of the inner pipe elbow1＝1.5D1And the nominal diameter D of the inner pipe elbow1Correspondingly, the nominal diameter D of the elbow of the outer pipe2Can be 300mm, 350mm, 400mm, 450mm or 550mm, in which case the radius of curvature R of the outer pipe bend can be ensured2＝1.0D2. Therefore, on the premise of ensuring the 1.5D curvature radius of the inner pipe elbow, the standard 1.0D curvature radius outer pipe elbow structure can be adopted.
TABLE 1 numerical table of nominal diameter and curvature radius of inner pipe elbow and outer pipe elbow
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the spirit and scope of the present invention.
Claims (10)
1. A jacketed pipe elbow structure, comprising:
an inner straight tube;
the two ends of the inner pipe elbow are connected with the inner straight pipe, and the nominal diameter of the inner pipe elbow is the same as that of the inner straight pipe;
the outer straight pipe is sleeved on the inner straight pipe in a clamping manner;
the outer pipe elbow is clamped on the inner pipe elbow, and the nominal diameter of the outer pipe elbow is larger than that of the outer straight pipe;
the reducing pipe is distributed at two ends of the outer pipe elbow, the reducing pipe is provided with a small end and a large end, the large end of the reducing pipe is aligned with the end face of the outer pipe elbow and connected with the end face of the outer straight pipe, and the small end of the reducing pipe is aligned with the end face of the outer straight pipe and connected with the end face of the outer straight pipe.
2. The jacketed pipe elbow structure of claim 1, wherein the nominal diameter of the large end of the reducer is the same as the nominal diameter of the outer pipe elbow, and the nominal diameter of the small end of the reducer is the same as the nominal diameter of the outer straight pipe.
3. The jacketed elbow structure of claim 1, wherein the nominal diameter of the reducer gradually increases from the small end to the large end.
4. The jacketed pipe elbow structure of claim 1, wherein the reducer is formed in a throw cut.
5. The jacketed elbow structure of claim 1, wherein the inner pipe elbow has a nominal diameter D1Is in the range of 200mm to 400 mm.
6. The jacketed pipe elbow structure of claim 5, wherein the inner pipe elbow has a nominal diameter D1Is 200mm, 250mm, 300mm, 350mm or 400 mm.
7. The jacketed pipe elbow structure of claim 6, wherein the radius of curvature R of the inner pipe elbow1＝1.5D1。
8. The jacketed pipe elbow structure of claim 7, wherein the outer pipe elbow has a nominal diameter D2Is in the range of 300mm to 500 mm.
9. The jacketed pipe elbow structure of claim 8, wherein the nominal diameter D of the inner pipe elbow is1Correspondingly, the nominal diameter D of the elbow of the outer tube2Is 300mm, 350mm, 400mm, 450mm or 550 mm.
10. The jacketed elbow structure of claim 9, wherein the outer pipe elbow has a radius of curvature R2＝1.0D2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020744550.5U CN212080469U (en) | 2020-05-08 | 2020-05-08 | Bent structure of jacketed pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020744550.5U CN212080469U (en) | 2020-05-08 | 2020-05-08 | Bent structure of jacketed pipe |
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| CN212080469U true CN212080469U (en) | 2020-12-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020590A (en) * | 2023-10-08 | 2023-11-10 | 核工业西南物理研究院 | Manufacturing method of special pipe with interlayer |
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2020
- 2020-05-08 CN CN202020744550.5U patent/CN212080469U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020590A (en) * | 2023-10-08 | 2023-11-10 | 核工业西南物理研究院 | Manufacturing method of special pipe with interlayer |
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