CN2278148Y

CN2278148Y - Continuous stress closure for thin wall cylinder-shaped pressure vessel

Info

Publication number: CN2278148Y
Application number: CN 96230871
Authority: CN
Inventors: 费钧望
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-11
Filing date: 1996-10-11
Publication date: 1998-04-08
Anticipated expiration: 2006-10-11

Abstract

The utility model relates to a continuous sealing head for a thin wall cylinder-shaped pressure vessel, which is characterized in that a section of variable camber transition curve section is arranged between the are line bus section and the straight line bus section of the sealing head. The end point of connection of the transition curve section and the straight line bus section is an inflection point or the second derivative of the end point is zero. Both end points of the connection end of the transition curve section and the arc line bus section are provided with the same radial curvature radius and normal curvature radius. The utility model has good mechanical properties, and compared with the structure of the existing sealing head, has the advantages of high pressure resistance, high safety, material saving, etc.

Description

The continuous stress end socket of thin walled cylinder shape pressurized container

The utility model relates to pressurized container, specifically is a kind of end socket of cylindrical pressure vessel.

At present common cylindrical pressure vessel generally all comprises cylindrical shell and end socket two-part, both or be welded to connect or be solidly connected by the flange valve snail.For making end socket obtain good stressing conditions, generally end socket is designed to arcuate structure, rotates after smooth the connection with one section straight line bus section, busbar section (this section can be in fact the part of cylindrical shell) that becomes the end socket root by one section arc bus section, busbar section that constitutes the end socket top and form an integrated head.As ellipsoidal head, dished (torispherical) head, hemispherical head etc.So the root problem of structure end socket is the discontinuous problem of stress to occur at the tie point place of end socket arc bus section, busbar section and straight line bus section, busbar section.The not fine as yet so far in design solution of this problem can only be adopted the way that strengthens safety coefficient, promptly suitably increases wall thickness and goes to solve.This is still available this way concerning general cylindrical pressure vessel, but concerning thin-walled pressure vessel, this is not a good structure just.

The purpose of this utility model provides the continuous stress end socket of a kind of thin walled cylinder shape pressurized container, makes the arc bus section, busbar section of end socket vary continuously to the straight line bus section, busbar section, thereby eliminates the stress discrete state at two bus section, busbar section tie point places.

Why can the discontinuous problem of stress appear in the tie point place at end socket arc bus section, busbar section and straight line bus section, busbar section? from theory as can be known, because this its arc bus section, busbar section of some place and straight line bus radially, the normal direction radius of curvature is not wait, by present general design, radial buckling radius at this some place arc bus section, busbar section is a finite value, and the radial buckling radius of straight line bus section, busbar section is an infinitary value, so when designing routinely, both can't be continuous in the connection of this point.By higher mathematics as can be known, the second dervative of a point of inflexion on a curve place or a curve is that of zero, and its radius of curvature is ∞.If can use curved section in end enclosure structure, can solve the continuous connectivity problem of curved section and straightway with these characteristics.So the technical solution of the utility model is: between the arc bus section, busbar section of end socket and straight line bus section, busbar section, be provided with one section variable curvature bus transition curve section, this end points that this transition curve section is connected with the straight line bus section, busbar section is that a flex point or its second dervative are zero, this transition curve section be connected with the camber line bus section, busbar section two-end-point held have identical radially with the normal direction radius of curvature.

In the utility model, can require to select for use curved section such as the cubic parabola that has flex point, sinusoidal curve, cosine curve, sinusoidal single headed wire, cosine single headed wire according to the different designs of end socket or have second-order derivative is zero curved section, as the variable curvature bus transition curve section in the utility model.

Therefore, owing to have one section variable curvature transition curve section in the utility model end enclosure structure, this transition curve section two-end-point place has the radius of curvature that equates with the tie point place of arc bus section, busbar section and straight line bus section, busbar section respectively, therefore, realize between transition curve Duan Nengyu arc bus section, busbar section and straight line bus section, busbar section connecting continuously, also with regard to the discontinuous problem of the stress of having eliminated existing end enclosure structure.Mechanical property of the present utility model is good, compares with existing end enclosure structure, has withstand voltage height, safe and save advantage such as material.

Embodiment of the present utility model as shown in drawings,

Description of drawings:

Fig. 1 is the ellipsoidal head schematic cross-section during existing skill is asked.

Fig. 2 is the dished (torispherical) head schematic cross-section in the prior art.

Fig. 3 is the hemispherical head schematic cross-section in the prior art.

Fig. 4 is the conical head schematic cross-section that has transition arc in the prior art.

Fig. 5 is an ellipsoidal head embodiment schematic cross-section of the present utility model.

Fig. 6 is a conical head embodiment schematic cross-section of the present utility model.

Accompanying drawing

1,2,3,4 is several end enclosure structures (cross section) in the prior art.All there is the discontinuous problem of stress in they.See that by ellipsoidal head shown in Figure 1 wherein, oval bus 2 is the stress discontinuity point with the intersection point A place of straight line bus 1.Dished (torispherical) head shown in Figure 2, its dish-shaped bus (semi-circle) 3 and 1 of straight line bus are provided with one section transition arc line segment 31, but because of semi-circle 3 also unequal with the radius of curvature of transition arc 31, so there are two stress discontinuity poinies: the one, the tie point A of semi-circle 3 and transition arc 31; The 2nd, the tie point B of transition arc 31 and straight line bus 1.Hemispherical head shown in Figure 3, the stress discontinuity point is at the tie point place of arc generatrix 4 with straight line bus 1.The conical head that has transition arc shown in Figure 4, the tie point that its transition arc 51 and taper bus 5 and straight line bus are 1 is the stress discontinuity point.

See that by ellipsoidal head embodiment of the present utility model shown in Figure 5 the rotation bus of ellipsoidal head includes ellipsoid arc bus section, busbar section 6, variable curvature bus transition curve section 7 and straight line bus section, busbar section 8 three parts.Transition curve section 7 in the present embodiment adopts the cubic parabola curve with flex point O, this transition curve section 7 is connected with straight line bus section, busbar section 8 with its flex point O, with the tie point of ellipse arc bus section, busbar section 6 be the C point, two curves 6,7 this tie point place radius of curvature equate.Straight line bus section, busbar section 8 in the present embodiment is equivalent to the cylindrical shell straight line bus of pressurized container, that is can include this section straight line bus section, busbar section 8 in the end socket rotation bus, also can not comprise straight line bus section, busbar section 8, and the flex point O of transition curve section 7 is connected with cylindrical shell 1, but the former can improve the precision that end socket is connected with cylindrical shell.

See that by conical head embodiment of the present utility model shown in Figure 6 the rotation bus of conical head includes cone straight line bus section, busbar section 11, variable curvature bus transition curve section 10 and straight line bus section, busbar section 9 three parts.Transition curve section 10 in the present embodiment adopts the cubic parabola curve of symmetry, has two flex point E and F, and transition curve section 10 is connected with cone straight line bus section, busbar section 11 with straight line bus section, busbar section 9 respectively by this two flex point.

Claims

1, a kind of continuous stress end socket of thin walled cylinder shape pressurized container that includes arc bus section, busbar section and straight line bus section, busbar section, it is characterized in that: between the arc bus section, busbar section of end socket and straight line bus section, busbar section, be provided with one section variable curvature bus transition curve section, this end points that this transition curve section is connected with the straight line bus section, busbar section is a flex point, this transition curve section be connected with the camber line bus section, busbar section two-end-point of end have identical radially with the normal direction radius of curvature.

2, according to the described continuous stress end socket of claim 1, it is characterized in that it is zero curved section that said variable curvature bus transition curve section can be selected curved section such as the cubic parabola that has flex point, sinusoidal curve, cosine curve, sinusoidal single headed wire, cosine single headed wire or second-order derivative for use.