Fatigue resistant node structure for thin film fuel tank

Abstract

The utility model discloses a kind of thin film type fuel tank fatigue resistance node structure, it is located at the intersection of longitudinal bulkhead and transverse bulkhead of thin film type fuel tank;Longitudinal bulkhead has angle, and the angle of longitudinal bulkhead is equipped with horizontal truss, and horizontal truss extends from the outside of longitudinal bulkhead to the outside of transverse bulkhead;Horizontal truss is equipped with horizontal extension on the inside of longitudinal bulkhead, and the distance from the inside end of horizontal extension to longitudinal bulkhead is 25~35mm;Horizontal extension is fixedly connected to transverse bulkhead;Perforated hole with toe end is set on the horizontal truss of the outside of transverse bulkhead;Toe end height is 15~25mm;The distance between toe end and longitudinal bulkhead is 95~105mm.The utility model improves the fatigue resistance of fuel tank corner, to ensure the structural safety of fuel tank.

Description

Technical Field

[0001] This utility model relates to the field of marine technology, and in particular to a thin-film type fuel tank fatigue-resistant node structure. Background Technology

[0002] The longitudinal bulkhead corners of the membrane-type fuel tank are equipped with horizontal truss support structures. For example... Figure 1 and Figure 2 As shown, the membrane-type fuel tank 50 includes a transverse bulkhead 51 and a longitudinal bulkhead 52, which are vertically connected. The longitudinal bulkhead has a bend, and a horizontal girder 53 is provided at the bend, which connects both the longitudinal and transverse bulkheads. Due to the high flatness requirements of the membrane-type fuel tank, the intersection of the horizontal girder 53 and the transverse bulkhead 51 cannot be enlarged at the end, which would create a structural abrupt change and stress concentration points. The intersection 54 of the longitudinal bulkhead bend and the transverse bulkhead is prone to fatigue failure. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the above-mentioned defects in the existing technology and provide a thin-film type fuel tank fatigue-resistant node structure.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A fatigue-resistant node structure for a membrane-type fuel tank is provided at the intersection of the longitudinal and transverse bulkheads of the membrane-type fuel tank. The transverse bulkhead is vertically connected to the longitudinal bulkhead. The longitudinal bulkhead has a bend, and a horizontal girder is provided at the bend of the longitudinal bulkhead. The horizontal girder extends from the outside of the longitudinal bulkhead to the outside of the transverse bulkhead. The horizontal girder has a horizontal extension on the inside of the longitudinal bulkhead, and the distance from the inner end of the horizontal extension to the longitudinal bulkhead is 25-35 mm. The horizontal extension is fixed to the transverse bulkhead. A through hole with a toe is opened on the horizontal girder on the outside of the transverse bulkhead. The height of the toe is 15-25 mm. The distance between the toe and the longitudinal bulkhead is 95-105 mm.

[0006] Furthermore, the horizontal extension is plate-shaped and extends longitudinally on the longitudinal bulkhead.

[0007] Furthermore, the horizontal extensions and longitudinal bulkheads are welded together.

[0008] Furthermore, the horizontal extension is on the same plane as the horizontal truss.

[0009] Furthermore, the distance from the inner end of the horizontal extension to the longitudinal bulkhead is 30 mm.

[0010] Furthermore, the through-hole is located at the end of the horizontal girder that connects to the transverse bulkhead.

[0011] Furthermore, the through hole is a round hole.

[0012] Furthermore, the radius of the through hole is 100mm.

[0013] Furthermore, the toe height is 20mm.

[0014] Furthermore, the distance between the toe tip and the longitudinal bulkhead is 100mm.

[0015] The beneficial effects of this utility model are as follows: This utility model sets up anti-fatigue nodes at the intersection of the horizontal girder and the transverse bulkhead, without affecting the laying of the membrane tank insulation layer. It solves the stress concentration problem caused by structural abrupt changes at the transverse bulkhead due to the horizontal girder support structure at the longitudinal bulkhead corner, and solves the problem of excessively thick corner plates in large membrane fuel tanks. This significantly improves the stress concentration at the location of structural abrupt changes under the total longitudinal load of the hull, enhances the fatigue resistance of the fuel tank corners, reduces the risk of fatigue failure caused by structural abrupt changes, and thus ensures the structural safety of the fuel tank. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the existing technology.

[0017] Figure 2 for Figure 1 Schematic diagram of the FF section.

[0018] Figure 3 This is a schematic diagram of a preferred embodiment of the present invention.

[0019] Figure 4 for Figure 3 Schematic diagram of sectional view AA.

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of part B in the middle. Detailed Implementation

[0021] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0022] like Figure 3 , Figure 4 and Figure 5 As shown, a fatigue-resistant node structure for a membrane-type fuel tank is provided at the intersection of the longitudinal bulkhead 11 and the transverse bulkhead 12 of the membrane-type fuel tank 10.

[0023] The transverse bulkhead 12 is vertically connected to the longitudinal bulkhead 11; the longitudinal bulkhead 11 has a bend, and a horizontal girder 13 is provided at the bend of the longitudinal bulkhead, the horizontal girder 13 extending from the outside of the longitudinal bulkhead to the outside of the transverse bulkhead.

[0024] The horizontal girder 13 has a horizontal extension 14 on the inner side of the longitudinal bulkhead 11. The horizontal extension 14 is plate-shaped and extends longitudinally on the longitudinal bulkhead.

[0025] The horizontal extension 14 is fixed to the transverse bulkhead 12.

[0026] The horizontal extension 14 and the horizontal girder 13 are on the same plane. The horizontal extension 14 and the longitudinal bulkhead 11 are welded together.

[0027] The distance D from the inner end of the horizontal extension 14 to the longitudinal bulkhead 11 is 25-35 mm. In a preferred embodiment, the distance D from the inner end of the horizontal extension 14 to the longitudinal bulkhead 11 is 30 mm.

[0028] A through hole 20 with a toe end is provided on the horizontal truss on the outer side of the transverse bulkhead. The through hole 20 is located at the end of the horizontal truss that connects to the transverse bulkhead.

[0029] The through hole 20 is a circular hole. In a preferred embodiment, the radius R of the through hole 20 is 100 mm.

[0030] The height H of the toe tip 21 is 15-25 mm. In the preferred embodiment, the height H of the toe tip 21 is 20 mm.

[0031] The distance E between the toe tip 21 and the longitudinal bulkhead 11 is 95-105 mm. In a preferred embodiment, the distance E between the toe tip and the longitudinal bulkhead is 100 mm.

[0032] Calculations and analysis show that the stress at the corners of the longitudinal bulkheads and the intersections of the transverse bulkheads is greatly reduced.

[0033] This invention incorporates fatigue-resistant nodes at the intersection of the horizontal girder and the transverse bulkhead, without affecting the laying of the membrane tank insulation layer. It solves the stress concentration problem caused by structural abrupt changes at the transverse bulkhead due to the horizontal girder support structure at the longitudinal bulkhead corner, and also addresses the issue of excessively thick corner plates in large membrane fuel tanks. This significantly improves the stress concentration at the location of structural abrupt changes under the total longitudinal load of the hull, enhances the fatigue resistance of the fuel tank corners, reduces the risk of fatigue failure caused by structural abrupt changes, and thus ensures the structural safety of the fuel tank.

[0034] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A fatigue-resistant node structure for a membrane-type fuel tank, disposed at the intersection of the longitudinal and transverse bulkheads of the membrane-type fuel tank; the transverse bulkhead is perpendicularly connected to the longitudinal bulkhead; the longitudinal bulkhead has a bend, and a horizontal girder is provided at the bend of the longitudinal bulkhead, the horizontal girder extending from the outer side of the longitudinal bulkhead to the outer side of the transverse bulkhead; characterized in that, The horizontal girder has a horizontal extension on the inner side of the longitudinal bulkhead, and the distance from the inner end of the horizontal extension to the longitudinal bulkhead is 25-35 mm; the horizontal extension is fixed to the transverse bulkhead; a through hole with a toe is opened on the horizontal girder on the outer side of the transverse bulkhead; the height of the toe is 15-25 mm; the distance between the toe and the longitudinal bulkhead is 95-105 mm.

2. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The horizontal extension is plate-shaped and extends longitudinally along the longitudinal bulkhead.

3. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The horizontal extension and the longitudinal bulkhead are welded together.

4. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The horizontal extension is on the same plane as the horizontal truss.

5. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The distance from the inner end of the horizontal extension to the longitudinal bulkhead is 30mm.

6. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The through-hole is located at the end of the horizontal girder that connects to the transverse bulkhead.

7. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 1, characterized in that, The through hole is a round hole.

8. The membrane-type fuel tank fatigue-resistant node structure as described in claim 7, characterized in that, The radius of the through hole is 100mm.

9. The anti-fatigue node structure of the membrane-type fuel tank as described in claim 8, characterized in that, The height of the toe tip is 20mm.

10. The membrane-type fuel tank fatigue-resistant node structure as described in claim 9, characterized in that, The distance between the toe and the longitudinal bulkhead is 100mm.

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