Compression-resistant and bending-resistant double-omega-shaped seamless steel tube

Abstract

The utility model discloses a compression-resistant and bending-resistant double-omega-shaped seamless steel pipe which comprises a steel pipe body, the periphery of the cross section of any position of the steel pipe body comprises two straight edges and two grooves, the two straight edges are symmetrically distributed, the two grooves are symmetrically distributed, and any groove is in arc connection with the two adjacent straight edges; the two grooves and the two adjacent straight edges form a double-omega-shaped structure. Through the connection design of the two oppositely-distributed straight edges and the two oppositely-distributed grooves, the double-omega-shaped seamless steel pipe is obtained and can be telescopically adjusted in the radial direction in the high-temperature and high-pressure environment so as to bear the impact of high-temperature and high-pressure steam, so that the anti-fatigue performance of the seamless steel pipe is improved, and the service life of the seamless steel pipe is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe technical field especially relates to a kind of compression and bending resistance type double "Ω" seamless steel pipes. BACKGROUND

[0002] Seamless steel pipe is essential part of large industrial boiler high-temperature cooling system, usually used in high-temperature and high-pressure environment, such as power plant boiler, chemical equipment, etc., so the superconducting heat, compression resistance and bending resistance and other requirements are higher.

[0003] In prior art, the pipeline for large industrial boiler high-temperature cooling system is mostly ordinary circular seamless steel pipe. This circular seamless steel pipe has no pertinence to working environment or working space, and has relatively poor fatigue resistance in high-temperature and high-pressure environment, resulting in short service life, frequent replacement or maintenance, and serious increase in production cost. SUMMARY

[0004] The utility model provides a kind of compression and bending resistance type double "Ω" seamless steel pipes, and the above-mentioned defects of existing circular seamless steel pipe in the application in large industrial boiler high-temperature cooling system can be solved.

[0005] To solve the above technical problems, the utility model provides a kind of compression and bending resistance type double "Ω" seamless steel pipes, including steel pipe body, the steel pipe body has two opposite distribution straight edges and two opposite distribution grooves, the groove is respectively with two adjacent straight edges arc connection;Two grooves and adjacent two straight edges form double "Ω" structure.

[0006] In a preferred embodiment of the utility model, the straight edge and the groove are connected in sequence through first arc transition section and second arc transition section.

[0007] In a preferred embodiment of the utility model, the first arc transition section has a circular arc angle of 6-8°.

[0008] In a preferred embodiment of the utility model, the second arc transition section has a circular arc angle of 2-3°.

[0009] In a preferred embodiment of the utility model, the bottom surface of the groove is a plane, and the two ends of the bottom surface have third arc transition sections.

[0010] In a preferred embodiment of the utility model, the third arc transition section has a circular arc angle of 4-5°.

[0011] In a preferred embodiment of the utility model, the width of the groove is 3-6 times its depth.

[0012] In a preferred embodiment of the utility model, the width of the straight edge is greater than the width of the groove.

[0013] In a preferred embodiment of the present application, the width of the groove is greater than the inner hole diameter of the steel pipe body.

[0014] In a preferred embodiment of the present application, the width of the straight edge is 3-7 times the thickness of the steel pipe wall.

[0015] The present application has the advantages that the anti-pressure and anti-bending double-Ω seamless steel pipe can be expanded and contracted in the radial direction under high temperature and high pressure environment to withstand the impact of high temperature and high pressure steam, thereby improving the fatigue resistance and prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a cross-sectional structure schematic view of a preferred embodiment of the anti-pressure and anti-bending double-Ω seamless steel pipe of the present application;

[0017] Figure 2 is a three-dimensional structure schematic view of a preferred embodiment of the anti-pressure and anti-bending double-Ω seamless steel pipe of the present application;

[0018] The labels of the components in the drawings are as follows: 100. steel pipe body, 110. circular inner hole, 10. straight edge, 20. groove, 11. first arc-shaped transition section, 12. second arc-shaped transition section, 21. third arc-shaped transition section. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application can be more clearly defined.

[0020] Please refer to Figure 1 and 2 , the present application comprises:

[0021] Embodiment 1

[0022] The present application discloses an anti-pressure and anti-bending double-Ω seamless steel pipe, comprising a steel pipe body 100.

[0023] The steel pipe body 100 has a circular inner hole 110 along the length direction of the steel pipe at the center axis.

[0024] The cross section outer periphery of the steel pipe body 100 at any position comprises two straight edges 10 and two grooves 20, the two straight edges 10 are symmetrically distributed, the two grooves 20 are symmetrically distributed, and any groove 20 is connected with two adjacent straight edges 10 in an arc shape respectively; the two grooves 20 and the two adjacent straight edges 10 form a double "Ω" structure.

[0025] The specific form of the arc-shaped connection is that the straight edge 10 and the groove 20 are sequentially connected through a first arc-shaped transition section 11 and a second arc-shaped transition section 12, and the arc degree of the first arc-shaped transition section 11 is greater than that of the second arc-shaped transition section 12.

[0026] Specifically, the circular arc angle of the first arc-shaped transition section 11 is 6°, and the circular arc angle of the second arc-shaped transition section 12 is 2°.

[0027] The bottom surface of the groove 20 is a plane, and the two ends of the bottom surface are provided with a third arc-shaped transition section 21. Specifically, the circular arc angle of the third arc-shaped transition section 21 is 4°.

[0028] Through the design of the first arc-shaped transition section 11, the second arc-shaped transition section 12 and the third arc-shaped transition section 21, on the one hand, the seamless steel pipe is ensured to have no sharp edges; on the other hand, in combination with the design of the groove, the seamless steel pipe can be adjusted in the radial direction under high temperature and high pressure environment, the fatigue resistance is improved, and the service life is prolonged.

[0029] Specifically, in the embodiment, the width of the straight edge 10 (excluding the width of the first arc-shaped transition section 11 and the second arc-shaped transition section 12) is 4 times the wall thickness of the steel pipe body 100.

[0030] The width of the groove 20 is greater than the diameter of the inner hole 110 of the steel pipe body 100. The width of the groove 20 is 4 times the depth.

[0031] Embodiment 2

[0032] The utility model discloses a kind of compression and bending resistance type double "Ω" seamless steel pipes, including steel pipe body 100.

[0033] The center axis of the steel pipe body 100 is provided with a circular inner hole 110 along the length direction of the steel pipe.

[0034] The cross section outer periphery of the steel pipe body 100 at any position comprises two straight edges 10 and two grooves 20, the two straight edges 10 are symmetrically distributed, the two grooves 20 are symmetrically distributed, and any groove 20 is connected with two adjacent straight edges 10 in an arc shape respectively; the two grooves 20 and the two adjacent straight edges 10 form a double "Ω" structure.

[0035] The specific form of the arc connection is that the straight edge 10 is connected with the groove 20 through the first arc transition section 11 and the second arc transition section 12 in sequence, and the curvature of the first arc transition section 11 is greater than the curvature of the second arc transition section 12.

[0036] Specifically, the circular arc angle of the first arc transition section 11 is 7°, and the circular arc angle of the second arc transition section 12 is 3°.

[0037] The bottom surface of the groove 20 is a plane, and the two ends of the bottom surface are provided with third arc transition sections 21. Specifically, the circular arc angle of the third arc transition section 21 is 5°.

[0038] Through the design of the first arc transition section 11, the second arc transition section 12 and the third arc transition section 21, on the one hand, the seamless steel pipe is ensured to have no sharp edges; on the other hand, in combination with the design of the groove, the seamless steel pipe can be expanded or contracted in the radial direction under high temperature and high pressure environment, the fatigue resistance is improved, and the service life is prolonged.

[0039] Specifically, in the embodiment, the width of the straight edge 10 (excluding the width of the first arc transition section 11 and the second arc transition section 12) is 6 times the wall thickness of the steel pipe body 100.

[0040] The width of the groove 20 is greater than the diameter of the inner hole 110 of the steel pipe body 100. The width of the groove 20 is 5 times the depth thereof.

[0041] The double-Ω seamless steel pipe in the above embodiment can expand or contract with the assistance of the first arc transition section 11, the second arc transition section 12 and the third arc transition section 21 during service, so as to realize the expansion or contraction of the seamless steel pipe in the radial direction, and improve the service life.

[0042] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A double "Ω" seamless steel pipe of compression and bending resistance, characterized by, The steel pipe body has two opposite straight edges and two opposite grooves, the grooves are respectively connected with two adjacent straight edges in an arc shape, and two grooves and two adjacent straight edges form a double "Ω" structure.

2. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 1, characterized in that, The straight edge and the groove are connected through a first arc transition section and a second arc transition section in sequence.

3. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 2, characterized in that, The first arc transition section has a circular arc angle of R6-R8.

4. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 2, characterized in that, The second arc transition section has a circular arc angle of R2-R3.

5. The compression and bending resistant double "Ω" seamless steel pipe according to claim 1, characterized in that, The bottom surface of the groove is a plane, and both ends of the bottom surface have a third arc transition section.

6. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 5, characterized in that, The third arc transition section has a circular arc angle of R4-R5.

7. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 5, characterized in that, The width of the groove is 3-6 times the depth of the groove.

8. A compression and bending resistant double "Ω" seamless steel pipe according to claim 1, characterized in that, The width of the straight edge is greater than the width of the groove.

9. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 8, characterized in that, The width of the groove is greater than the inner hole diameter of the steel pipe body.

10. A double "Ω" seamless steel pipe of compression and bending resistance type according to claim 8, characterized in that, The width of the straight edge is 3-7 times the thickness of the steel pipe wall.

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