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External pressure self-intensification cylinder and design calculation and manufacturing method thereof

A manufacturing method, design and calculation technology, applied in the direction of calculation, pressure vessels, mechanical equipment, etc., can solve problems such as cumbersome, inner layer compression yielding, roughness, etc.

Inactive Publication Date: 2010-02-24
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the current internal pressure vessel methods, some are too rough (such as the diagram method and estimation method), they cannot reflect the essence of the problem; some are too cumbersome (such as the trial and error method), and they cannot reflect the essence of the problem.
And it cannot overcome some disadvantages, such as the reverse yield problem, that is, the pressure p applied during self-enhancement treatment is removed a Afterwards, the inner layer may produce compression yield due to excessive compression
this is very unfavorable

Method used

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  • External pressure self-intensification cylinder and design calculation and manufacturing method thereof
  • External pressure self-intensification cylinder and design calculation and manufacturing method thereof
  • External pressure self-intensification cylinder and design calculation and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0238] Example 1, a certain external pressure high-pressure vessel adopts self-reinforcing technology, and the inner diameter is r i =150mm; container material is 34CrNi3MoA, its σ y = 700Mpa; the external pressure to bear is p = 360Mpa; according to the relevant industry's design specifications for containers, the safety factor is taken as n = 1.6.

[0239] The calculated thickness of the container can be calculated immediately from formula (55):

[0240] t = r i ( σ y σ y - np - 1 ) = 150 ( 700 700 - 1.6 ...

Embodiment 2

[0248] Example 2, assuming that the process calculation determines the inner diameter of the pressure vessel r i =500mm; the container material is 20MnMoNb, its σ y =480Mpa; the required external pressure p=100Mpa; the safety factor is n=1.6.

[0249] The calculated thickness of the container can be calculated immediately from formula (55):

[0250] t = r i ( σ y σ y - np - 1 ) = 500 ( 480 480 - 1.6 × 100 - 1 ) ...

Embodiment 3

[0266] Example 3, there is a self-reinforcing container with diameter ratio k=2.5, made of 20MnMoNb, σ y = 480 MPa. It is necessary to determine the load that the container can withstand.

[0267] According to the fourth intensity theory. By formula (45') or Figure 15 Get: the best carrying capacity p * / σ y = 0.969948, ie p * =0.969948×480=465.5753Mpa, take safety factor n=1.6, then p=465.5753 / 1.6=290.9845Mpa. Look up table 1 and know, when k=2.5, k j * = 1.844363 . When the container bears an external pressure of 290.9845Mpa, there must be σ′ ei = σ y , σ in the entire plastic zone e T y . verify:

[0268] According to formula (30): σ ei ′ σ y = k 2 l...

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Abstract

The invention discloses an external pressure self-intensification cylinder and a design calculation and a manufacturing method thereof, which is used for improving the safety and the bearing capability of a pressure vessel and solving the phenomenon of lacking external pressure self-intensification vessel design calculation and manufacturing methods and the technical problems of unsafety and the like caused by complex or inaccurate design calculation of the existing internal pressure self-intensification technology. The invention has the following technical scheme key points: adopting a special bearing capability, plastic zone depth and cylinder wall thickness calculating formula to ensure that the equivalent stress of the total stress (the sum of stress caused by operation pressure and self-intensification residual stress) in the wall of the cylinder is not more than the yield strength sigma y of cylinder material; or ensuring that the equivalent stress of the residual stress in the whole cylinder wall of the self-intensification cylinder and the equivalent stress of the total stress are both not more than sigma y. The invention also provides a maximum diameter ratio which does not yield after the self-intensification pressure is removed no mater how deep the plastic zone is when the self-intensification technology is applied. The technical scheme of the invention is also suitable for an internal pressure self-intensification cylinder.

Description

technical field [0001] The invention relates to an external pressure self-reinforcing cylinder and its design calculation and manufacturing method. Background technique [0002] Most of the pressure vessels are cylindrical in shape, such as chemical containers, petrochemical containers, barrels, nuclear reaction vessels, etc. Pressure vessels are widely used in many industrial sectors, such as machinery, chemical industry, pharmaceuticals, energy, materials, food, metallurgy, petroleum, construction, aviation, aerospace, weapons and other departments. In addition to the internal pressure, the pressure vessel is also often subjected to external pressure, as shown in the attached manual figure 1 shown. Regardless of whether the cylinder is subjected to internal pressure or external pressure, the elastic stress distribution in the cylinder wall is very uneven, and the stress on the inner wall is much greater than the stress on the outer wall, such as figure 2 shown. The gr...

Claims

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Application Information

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IPC IPC(8): G06F17/00F16J12/00
Inventor 朱瑞林
Owner HUNAN NORMAL UNIVERSITY
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