A sealing film unit for a low-temperature liquefied gas storage tank, a sealing film, and a storage tank

Abstract

This invention relates to a sealing membrane unit, sealing membrane, and storage tank for cryogenic liquefied gas storage tanks. The sealing membrane includes a sealing membrane for a circular planar region, a sealing membrane for a cylindrical curved surface region, and a dihedral region transitioning between the circular sealing membrane and the cylindrical curved surface region. The sealing membranes in the circular and cylindrical curved surface regions each have corrugated protrusions resembling a "well" shape, formed by a first corrugated protrusion, a second corrugated protrusion, and a third corrugated protrusion. The junction area between the first, second, and third corrugated protrusions of this invention avoids concentrated thinning effects, effectively increasing the strength of the sealing membrane.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-temperature liquefied gas storage, in particular to a sealing film unit for a low-temperature liquefied gas storage tank, a sealing film and a storage tank. BACKGROUND

[0002] Natural gas, ethane and other gases are usually stored after being cooled and liquefied. After being liquefied, the volume of the gas is greatly reduced, and a low-temperature liquid is formed. The temperature of liquefied natural gas is between -163℃ and -80℃, and the temperature of liquefied petroleum gas is between -50℃ and 0℃. Liquefied gas needs to be placed in a special low-temperature liquid cargo storage tank for storage.

[0003] The common storage tank for land use is a cylindrical storage tank. The sealing film in the storage tank directly contacted with the liquefied gas is usually a stainless steel corrugated plate. The stainless steel plate usually needs to be provided with different forms of convex or concave corrugated folds to adapt to low-temperature shrinkage. Although the land-use storage tank is generally not moved, the shaking caused by factors such as earthquakes needs to be considered. The liquefied gas will produce sloshing movement with the ground shaking. The sloshing movement is the fluctuation of the free surface of the liquid, which causes the nonlinear random movement of the liquid in the storage tank. During the sloshing process, the liquefied gas produces impact on the tank body. This impact stress is easy to have an adverse effect on the sealing film. Therefore, the sealing film structure needs to have high strength.

[0004] The prior art such as the invention patent with publication number CN110740927B discloses a film-shaped finishing plate and a heat insulation structure of a film-shaped object including the same. A plurality of wrinkle portions are formed on the film-shaped finishing plate. In the film-shaped finishing plate, three edges other than the direction of the finishing portion of the film-shaped object are provided so that the wrinkle portions have an open structure. The wrinkle portions of the open structure are connected to the wrinkle portions formed on the adjacent plate to be continuous with them. As can be seen from the drawings, the wrinkle portions as a whole are in a staggered non-penetrating cross shape. That is, at least one end of the wrinkle portions is in a closed structure. According to the current processing technology, the wrinkle portions with the end closed structure are thinned during the stamping process. There is a thinning concentration effect at the position of the staggered non-penetrating cross shape of the wrinkle portions, and the strength is low. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a sealing film unit for a low-temperature liquefied gas storage tank, a sealing film and a storage tank. The combination of the first corrugated protrusion with both ends open, the second corrugated protrusion with one end open and the third corrugated protrusion with both ends closed enhances the strength of the sealing film.

[0006] The technical purpose of the present application is achieved by the following technical scheme:

[0007] The application provides a sealing film unit for a low-temperature liquefied gas sealed and insulated storage tank, which is used for a circular planar area and comprises a film base body, the film base body is a fan ring planar structure, the fan ring planar structure takes the center of the circular planar area as the center, and first corrugated protrusions with two open ends, second corrugated protrusions with one open end and third corrugated protrusions with two closed ends are formed on the surface of the film base body and do not contact each other.

[0008] The two ends of the first corrugated protrusions extend from the inner side of the film base body to the two side edges of the film base body and are cut off at the edges of the film base body to form an open structure; the first corrugated protrusions are arranged along the radial direction of the circular planar area or the concentric circle direction.

[0009] The one end of the second corrugated protrusions extends along the other two side edges of the film base body to the inner side of the film base body respectively, the one end of the second corrugated protrusions forms an open structure at the edge of the film base body, and the other end of the second corrugated protrusions forms a closed structure; when the first corrugated protrusions are arranged along the radial direction of the circular planar area, the second corrugated protrusions are arranged along the concentric circle direction of the circular planar area; when the first corrugated protrusions are arranged along the concentric circle direction of the circular planar area, the second corrugated protrusions are arranged along the radial direction of the circular planar area.

[0010] The third corrugated protrusions are arranged between the second corrugated protrusions on the two sides of the film base body, and the two ends of the third corrugated protrusions are respectively directed to the second corrugated protrusions on the two sides; the direction of the third corrugated protrusions is consistent with the direction of the second corrugated protrusions.

[0011] The application further provides a sealing film unit for a low-temperature liquefied gas sealed and insulated storage tank, which is used for a cylindrical curved surface area and comprises a film base body, the film base body is a curved surface structure with the same radius as the arc surface of the cylindrical curved surface area, first corrugated protrusions with two open ends, second corrugated protrusions with one open end and third corrugated protrusions with two closed ends are formed on the surface of the film base body and do not contact each other.

[0012] The two ends of the first corrugated protrusions extend from the inner side of the film base body to the two side edges of the film base body and are cut off at the edges of the film base body to form an open structure; the first corrugated protrusions are arranged along the arc surface perimeter direction of the cylindrical curved surface area or the arc surface axial direction of the cylindrical curved surface area.

[0013] The one end of the second corrugated protrusions extends along the other two side edges of the film base body to the inner side of the film base body respectively, the one end of the second corrugated protrusions forms an open structure at the edge of the film base body, and the other end of the second corrugated protrusions forms a closed structure; when the first corrugated protrusions are arranged along the arc surface perimeter direction of the cylindrical curved surface area, the second corrugated protrusions are arranged along the arc surface axial direction of the cylindrical curved surface area; when the first corrugated protrusions are arranged along the arc surface axial direction of the cylindrical curved surface area, the second corrugated protrusions are arranged along the arc surface perimeter direction of the cylindrical curved surface area.

[0014] The third corrugated protrusion is arranged between the second corrugated protrusions on both sides of the film base body, and the two ends of the third corrugated protrusion are respectively directed towards the second corrugated protrusions on both sides; the direction of the third corrugated protrusion is consistent with the direction of the second corrugated protrusion.

[0015] The application further provides a sealing film for a low-temperature liquefied gas sealed and insulated storage tank, which comprises a circular planar area and a cylindrical curved surface area arranged around the circular planar area, the circular planar area comprises a plurality of fan-shaped annular first sealing film units, the cylindrical curved surface area comprises a plurality of second sealing film units with arc surfaces, the first sealing film units and the second sealing film units are each provided with first corrugated protrusions with open two ends, second corrugated protrusions with open one end and third corrugated protrusions with closed two ends; the first sealing film units are arranged in a gradually increasing manner from the center of the circular planar area to the outside in the radial direction of the circular planar area.

[0016] Further, in the circular planar area: the first corrugated protrusions of the first sealing film units are arranged in the radial direction of the circular planar area or in the concentric circle direction; when the first corrugated protrusions of the first sealing film units are arranged in the radial direction of the circular planar area, the second corrugated protrusions of the first sealing film units are arranged in the concentric circle direction of the circular planar area; when the first corrugated protrusions of the first sealing film units are arranged in the concentric circle direction of the circular planar area, the second corrugated protrusions of the first sealing film units are arranged in the radial direction of the circular planar area; the direction of the third corrugated protrusions of the first sealing film units is consistent with the direction of the second corrugated protrusions of the first sealing film units.

[0017] Further, in the cylindrical curved surface area: the first corrugated protrusions of the second sealing film units are arranged in the arc length direction of the cylindrical curved surface area or in the arc axial direction of the cylindrical curved surface area; when the first corrugated protrusions of the second sealing film units are arranged in the arc length direction of the cylindrical curved surface area, the second corrugated protrusions of the second sealing film units are arranged in the arc axial direction of the cylindrical curved surface area; when the first corrugated protrusions of the second sealing film units are arranged in the arc axial direction of the cylindrical curved surface area, the second corrugated protrusions of the second sealing film units are arranged in the arc length direction of the cylindrical curved surface area; the direction of the third corrugated protrusions of the second sealing film units is consistent with the direction of the second corrugated protrusions of the second sealing film units.

[0018] Further, in the circular planar region, the first corrugated protrusions and the second corrugated protrusions between two adjacent first sealing film units are spliced, and the directions of the first corrugated protrusions of the two adjacent first sealing film units are respectively arranged along the radial direction of the circular planar region and the concentric direction of the circular planar region; in the cylindrical curved surface region, the first corrugated protrusions and the second corrugated protrusions between two adjacent second sealing film units are spliced, and the directions of the first corrugated protrusions of the two adjacent second sealing film units are respectively arranged along the arc length direction of the cylindrical curved surface region and the arc axial direction of the cylindrical curved surface region.

[0019] Further, the second corrugated protrusions and the third corrugated protrusions have the same cross section as the first corrugated protrusions.

[0020] Further, the cross section of the first corrugated protrusion has a top circular arc, a connecting region circular arc symmetrically connected on both sides of the top circular arc, and a transition region circular arc connecting both sides of the connecting region circular arc, the connecting region circular arc is inscribedly connected with the top circular arc, the transition region circular arc is circumscribedly connected with the connecting region circular arc, and the transition region circular arc is circumscribedly connected with the film substrate surface.

[0021] Further, the distance from the middle part of the top circular arc to the film substrate surface is H, the radius of the top circular arc is R1, the radius of the connecting region circular arc is R2, and the radius of the transition circular arc region is R3; wherein R1

[0022] 1≤R1:R3≤3;

[0023] 6≤R2:R3≤14;

[0024] R2:H≤3.

[0025] Further, the cross section of the first corrugated protrusion has a parabolic line type, and the parabolic line type satisfies: Y = X2 / h, where h is the distance from the vertex of the parabolic line type to the film substrate surface.

[0026] Further, the radius of the transition region circular arc is R4, R4, h and X satisfy 0.1h≤R4≤0.3h, h satisfies 18mm≤h≤80mm, and X satisfies 4≤|X|≤42.

[0027] Further, the third corrugated protrusion is arranged between two first corrugated protrusions, and one second corrugated protrusion is arranged on one side of the first corrugated protrusion close to the two ends of the first corrugated protrusion; the two ends of the third corrugated protrusion correspond to one second corrugated protrusion respectively. ​

[0028] Further, the sealing film further comprises a corner region region connecting between the circular planar region and the cylindrical curved surface region.

[0029] Further, the corner region region comprises a middle inclined surface, a first corner surface arranged on one side of the middle inclined surface, and a second corner surface arranged on the other side of the middle inclined surface, and the corner region region is curved with the center of the circular planar region as the center, the first corner surface is spliced with the circular planar region, and the second corner surface is spliced with the cylindrical curved surface region.

[0030] Further, the corner region region comprises a plurality of first corner sealing films and a plurality of second corner sealing films, and the first corner sealing films and the second corner sealing films are alternately connected to form an annular corner region region.

[0031] Further, the first corner sealing film is provided with a fourth corrugated protrusion with two open ends in the middle of the middle inclined surface along the bending direction of the corner region region, and the first corner surface and the second corner surface close to the two ends of the fourth corrugated protrusion are respectively provided with a fifth corrugated protrusion with one open end; the second corner sealing film is provided with a sixth corrugated protrusion with one open end at both ends of the middle inclined surface; two seventh corrugated protrusions are further arranged between the two sixth corrugated protrusions, and the two ends of the seventh corrugated protrusion are open, one end of the seventh corrugated protrusion starts along the edge of the first corner surface on one side, and the other end of the seventh corrugated protrusion extends through the middle inclined surface and then extends to the edge of the second corner surface on the other side.

[0032] Further, the fourth corrugated protrusion and the sixth corrugated protrusion are spliced between adjacent first corner sealing films and second corner sealing films.

[0033] Further, the unsealed regions of the fourth corrugated protrusion, the fifth corrugated protrusion, the sixth corrugated protrusion and the seventh corrugated protrusion have the same cross section as the first corrugated protrusion; the fifth corrugated protrusion is spliced with the first corrugated protrusion or the second corrugated protrusion; and the seventh corrugated protrusion is spliced with the first corrugated protrusion or the second corrugated protrusion.

[0034] Further, the seventh corrugated protrusion forms a corrugated fold corner region at the transition position of the middle inclined surface and the first corner surface and at the transition position of the middle inclined surface and the second corner surface; and the corrugated fold corner region is smoothly transitioned, concave or convex relative to the seventh corrugated protrusion.

[0035] Further, the material of the circular planar region, the cylindrical curved surface region and the corner region region is stainless steel, aluminum alloy or high manganese steel with a yield strength of 200MPa to 600MPa.

[0036] The application also provides a land cylindrical low-temperature liquefied natural gas sealed and insulated storage tank.

[0037] Compared with the prior art, the application has the following beneficial effects:

[0038] 1. The structure of the open two ends of the first corrugation, the open one end of the second corrugation and the closed two ends of the third corrugation can sandwich the first corrugation between the second corrugation and the third corrugation to form a structure similar to a well, the area where the first corrugation, the second corrugation and the third corrugation meet can avoid forming a concentrated thinning effect, the structural strength is increased, the strength of the sealing film is effectively improved, and the possibility of sealing damage of the land storage tank is reduced.

[0039] 2. The middle inclined surface of the dihedral region and the first and second corner region surfaces on the two sides can be arranged in a crisscross manner in the dihedral region, thereby effectively enhancing the low-temperature shrinkage performance of the dihedral region.

[0040] 3. The first and second corner region sealing films are alternately connected, so that the corrugations on the first and second corner region sealing films form crisscross corrugations, which can effectively avoid stress concentration of the sealing film in a low-temperature state and ensure the sealing performance of the sealing film. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of one form of the sealing film unit in the embodiment 1 of the application.

[0042] Figure 2 is a schematic diagram of another form of the sealing film unit in the embodiment 1 of the application.

[0043] Figure 3 is a schematic diagram of one form of the sealing film unit in the embodiment 2 of the application.

[0044] Figure 4 is a schematic diagram of another form of the sealing film unit in the embodiment 2 of the application.

[0045] Figure 5 is a schematic diagram of the connection of the circular planar region, the cylindrical curved surface region and the dihedral region in the application.

[0046] Figure 6 is a schematic diagram of the splicing of two adjacent first sealing film units in the embodiment 3 of the application.

[0047] Figure 7 is a schematic diagram of the splicing of two adjacent second sealing film units in the embodiment 3 of the application.

[0048] Figure 8is a cross-sectional schematic view of the first corrugated protrusion in Embodiment 3 of the present application.

[0049] Figure 9 is a cross-sectional schematic view of the first corrugated protrusion in Embodiment 4 of the present application.

[0050] Figure 10 is a schematic view of the first corner region sealing film structure in Embodiment 5 of the present application.

[0051] Figure 11 is a schematic view of the second corner region sealing film structure in Embodiment 5 of the present application.

[0052] Figure 12 is a schematic view of the splicing of the first corner region sealing film and the second corner region sealing film in Embodiment 5 of the present application.

[0053] Figure 13 is a schematic view of the plastic strain simulation of the sealing film in the present embodiment when the temperature decreases from 20°C to -183°C.

[0054] Figure 14 is a schematic view of the plastic strain simulation of the sealing film in the present embodiment under vertical pressure load.

[0055] In the figure, 1, film base body; 2, first corrugated protrusion; 3, second corrugated protrusion; 4, third corrugated protrusion; 5, first sealing film unit; 6, second sealing film unit; 7, first corner region sealing film; 8, second corner region sealing film; 9, intermediate inclined surface; 10, first corner region surface; 11, second corner region surface; 12, fourth corrugated protrusion; 13, fifth corrugated protrusion; 14, sixth corrugated protrusion; 15, seventh corrugated protrusion; 16, corrugated fold angle region;

[0056] 201, top circular arc; 202, connecting region circular arc; 203, transition region circular arc; 204, parabolic line type. Embodiment

[0057] The technical solutions of the present application are further described below in combination with specific embodiments: Embodiment

[0058] A sealing film unit for a low-temperature liquefied gas sealing and insulating storage tank, for a circular planar region, comprises a film base body, the film base body 1 is a fan ring planar structure, as shown in Figure 1 and Figure 2 The fan ring planar structure takes the center of the circular planar region as the center, and forms a first corrugated protrusion 2 with both ends open, a second corrugated protrusion 3 with one end open, and a third corrugated protrusion 4 with both ends closed on the surface of the film base body 1, the first corrugated protrusion 2, the second corrugated protrusion 3, and the third corrugated protrusion 4 do not contact each other;

[0059] The two ends of the first corrugated protrusion 2 extend from the inner side of the membrane base 1 to the two side edges of the membrane base 1 and terminate at the edges of the membrane base 1 to form an open structure; the first corrugated protrusion 2 is arranged along the radial direction of the circular planar area or as shown in Figure 1 arranged along the radial direction of the circular planar area or as shown in Figure 2 arranged along the concentric direction of the circular planar area;

[0060] The one end of the second corrugated protrusion 3 extends from the other two side edges of the membrane base 1 to the inner side of the membrane base 1, respectively, and the one end of the second corrugated protrusion 3 forms an open structure at the edge of the membrane base 1, and the other end of the second corrugated protrusion 3 forms a closed structure; when the first corrugated protrusion 2 is arranged along the radial direction of the circular planar area, the second corrugated protrusion 3 is arranged along the concentric direction of the circular planar area; when the first corrugated protrusion 2 is arranged along the concentric direction of the circular planar area, the second corrugated protrusion 3 is arranged along the radial direction of the circular planar area;

[0061] The third corrugated protrusion 4 is arranged between the two second corrugated protrusions 3 on the two sides of the membrane base 1, and the two ends of the third corrugated protrusion 4 are respectively directed to the two second corrugated protrusions 3 on the two sides. The direction of the third corrugated protrusion 4 is consistent with the direction of the second corrugated protrusion 3. Embodiment

[0062] A sealing film unit for a low-temperature liquefied gas sealed and insulated storage tank, for a cylindrical curved surface area, comprising a membrane base 1, the membrane base 1 being a curved surface structure with the same radius of curvature as the arc surface of the cylindrical curved surface area, and a first corrugated protrusion 2 with two open ends, a second corrugated protrusion 3 with one open end, and a third corrugated protrusion 4 with two closed ends being formed on the surface of the membrane base 1, the first corrugated protrusion 2, the second corrugated protrusion 3, and the third corrugated protrusion 4 not contacting each other;

[0063] The two ends of the first corrugated protrusion 2 extend from the inner side of the membrane base 1 to the two side edges of the membrane base 1 and terminate at the edges of the membrane base 1 to form an open structure; the first corrugated protrusion 2 is arranged along the radial direction of the circular planar area or as shown in Figure 3 arranged along the radial direction of the circular planar area or as shown in Figure 4 arranged along the radial direction of the circular planar area or as shown in

[0064] The one end of the second corrugated protrusion 3 extends from the other two side edges of the membrane base 1 to the inner side of the membrane base 1, respectively, and the one end of the second corrugated protrusion 3 forms an open structure at the edge of the membrane base 1, and the other end of the second corrugated protrusion 3 forms a closed structure; when the first corrugated protrusion 2 is arranged along the radial direction of the circular planar area, the second corrugated protrusion 3 is arranged along the concentric direction of the circular planar area; when the first corrugated protrusion 2 is arranged along the concentric direction of the circular planar area, the second corrugated protrusion 3 is arranged along the radial direction of the circular planar area;

[0065] The third corrugated protrusion 4 is positioned between the second corrugated protrusions 3 on both sides of the membrane substrate, with both ends of the third corrugated protrusion 4 facing the second corrugated protrusions 3 on both sides respectively; the direction of the third corrugated protrusion 4 is consistent with the direction of the second corrugated protrusions 3. Example

[0066] A sealing membrane for a cryogenic liquefied gas sealed and insulated storage tank, such as Figure 5 As shown, it includes a circular planar region and a cylindrical curved surface region enclosing the circular planar region. The circular planar region includes several annular first sealing film units 5, which are the same as the sealing film units for the circular planar region in Embodiment 1. The cylindrical curved surface region includes several second sealing film units 6 with arc surfaces, which are the same as the sealing film units for the cylindrical curved surface region in Embodiment 2.

[0067] The first sealing membrane unit 5 and the second sealing membrane unit 6 are each provided with a first corrugated protrusion 2 open at both ends, a second corrugated protrusion 3 open at one end, and a third corrugated protrusion 4 closed at both ends; the first sealing membrane unit 5 is arranged to gradually increase in size from the center outward along the radial direction of the circular planar region.

[0068] In a circular planar region: such as Figure 1 and Figure 2 As shown, the third corrugated protrusion 4 is disposed between the two first corrugated protrusions 2. A second corrugated protrusion 3 is disposed on one side of the first corrugated protrusion 2 near both ends of the first corrugated protrusion 2, and each end of the third corrugated protrusion 4 corresponds to a second corrugated protrusion 3. The first corrugated protrusion 2 of the first sealing film unit 5 is disposed along the radial direction of the circular planar region or in a concentric circular direction; when the first corrugated protrusion 2 of the first sealing film unit 5 is disposed along the radial direction of the circular planar region, the second corrugated protrusion 3 of the first sealing film unit 5 is disposed along the concentric circular direction of the circular planar region; when the first corrugated protrusion 3 of the first sealing film unit 5 is disposed along the concentric circular direction of the circular planar region, the second corrugated protrusion 3 of the first sealing film unit 5 is disposed along the radial direction of the circular planar region; the direction of the third corrugated protrusion 4 of the first sealing film unit 5 is consistent with the direction of the second corrugated protrusion 3 of the first sealing film unit 5; preferably, the second corrugated protrusion 3 and the third corrugated protrusion 4 of the first sealing film unit 5 are collinearly disposed, including... Figure 2 Collinearity of straight lines in Figure 1 The arcs in the circle are collinear.

[0069] In cylindrical curved surface regions: such as Figure 3 and Figure 4 As shown, the first corrugated protrusion 2 of the second sealing membrane unit 6 is arranged along the circumferential direction of the arc surface of the cylindrical curved surface region or along the axial direction of the arc surface of the cylindrical curved surface region; when the first corrugated protrusion 2 of the second sealing membrane unit 6 is arranged along the circumferential direction of the arc surface of the cylindrical curved surface region, such asFigure 3 As shown, the second corrugated protrusion 3 of the second sealing membrane unit 6 is arranged along the axial direction of the arc surface of the cylindrical curved surface region; when the first corrugated protrusion 2 of the second sealing membrane unit 6 is arranged along the axial direction of the arc surface of the cylindrical curved surface region, as... Figure 4 As shown, the second corrugated protrusion 3 of the second sealing membrane unit 6 is arranged along the circumference of the arc surface of the cylindrical curved surface region; the direction 4 of the third corrugated protrusion of the second sealing membrane unit 6 is consistent with the direction of the second corrugated protrusion of the second sealing membrane unit 3, including... Figure 3 Collinearity of straight lines in Figure 4 The arcs in the diagram are collinear.

[0070] In a circular planar region, such as Figure 6 and Figure 5 As shown, the first corrugated protrusion 2 and the second corrugated protrusion 3 are spliced ​​between two adjacent first sealing membrane units 5. Adjacent includes circumferential adjacency and radial adjacency. Figure 6 This is a schematic diagram of the first sealing membrane units 5 being adjacent in the circumferential direction. The directions of the first corrugated protrusions 2 of the two adjacent first sealing membrane units 5 are respectively set along the radial direction of the circular planar region and along the concentric circle direction of the circular planar region. As a complete circular planar region, an additional circular sealing membrane, such as a circular stainless steel plate, is needed to seal the center position. This will not be described in detail here.

[0071] In cylindrical curved surface regions, such as Figure 7 and Figure 5 As shown, the first corrugated protrusion 2 and the second corrugated protrusion 3 are spliced ​​between two adjacent second sealing membrane units 6, and the directions of the first corrugated protrusion 2 of the two adjacent second sealing membrane units 6 are respectively set along the circumference of the arc surface of the cylindrical curved surface region and along the axial direction of the arc surface of the cylindrical curved surface region.

[0072] The unclosed areas of the second and third corrugated protrusions have the same cross-section as the first corrugated protrusion.

[0073] like Figure 8 As shown, the cross-section of the first corrugated protrusion 2 has a top arc 201, connecting arc regions 202 symmetrically connected to both sides of the top arc 201, and a transition arc region 203 receiving the connecting arc regions 202. The connecting arc regions 202 are internally tangent to the top arc 201, and the transition arc region 203 is externally tangent to the connecting arc regions 202. The transition arc region 203 is externally tangent to the surface of the membrane substrate 1. The distance from the middle of the top arc to the surface of the membrane substrate is H, the radius of the top arc is R1, the radius of the connecting arc region is R2, and the radius of the transition arc region is R3; where R1 < R2 and 18mm ≤ H ≤ 65mm, and H, R1, R2, and R3 satisfy the following relationship:

[0074] 1≤R1:R3≤3;

[0075] 6≤R2:R3≤14;

[0076] R2:H≤3.

[0077] In the embodiment, as an example, the H of the top circular arc 101 is set to 35 mm, R1=9 mm, R2=66 mm, and R3=6 mm. Embodiment

[0078] Different from the embodiment 3, the cross-sectional line type of the first corrugation can also be a parabolic line type 204, as shown in Figure 9 The parabolic line type 204 satisfies: Y= hX2, where h is the distance from the vertex of the parabolic line type 204 to the upper surface of the film substrate 1; a transition area circular arc 203 is further provided between the parabolic line type 204 and the upper surface of the film substrate 1, and the parabolic line type is smoothly connected to the upper surface of the film substrate 1 through the transition area circular arc 203.

[0079] Specifically, the radius of the transition area circular arc is R4, R4, h, and X satisfy 0.1h≤R4≤0.3h, h satisfies 18 mm≤h≤80 mm, and X satisfies 4≤|X|≤42.

[0080] In the embodiment, as an example, h=35 mm, R4=5 mm, and |X|=12 mm. Embodiment

[0081] A sealing film for a low-temperature liquefied gas sealed and insulated storage tank, based on the embodiment 4 or the embodiment 5, characterized in that a two-corner area region is further transitionally connected between the circular planar region and the cylindrical curved surface region, the two-corner area region comprises a plurality of first corner area sealing films 7 and a plurality of second corner area sealing films 8, and the first corner area sealing films 7 and the second corner area sealing films 8 are alternately connected to form an annular two-corner area region.

[0082] The first corner area sealing film 7, as shown in Figure 10 includes a middle inclined surface 9, a first corner area surface 10 provided on one side of the middle inclined surface, and a second corner area surface 11 provided on the other side of the middle inclined surface, and the first corner area sealing film 7 is curvedly arranged with the center of the circular planar region as the center, and the first corner area sealing film 7 is provided with a fourth corrugated protrusion 12 with two open ends in the middle of the middle inclined surface 9 along the bending direction of the two-corner area region, and the first corner area surface 10 and the second corner area surface 11 close to the two ends of the fourth corrugated protrusion 12 are respectively provided with a fifth corrugated protrusion 13 with one open end.

[0083] The second corner area sealing film 8, as shown in Figure 11As shown, the first corner sealing film 7 is arranged in a circular center of the circular planar area, and the second corner sealing film 8 is provided with a sixth corrugated protrusion 14 with one end open at each end of the middle inclined surface 9; two seventh corrugated protrusions 15 are further provided between the sixth corrugated protrusions 14, and the seventh corrugated protrusions 15 are open at both ends, one end of the seventh corrugated protrusion 15 starts along the edge of the first corner surface 10 on one side, and the other end of the seventh corrugated protrusion 15 extends through the middle inclined surface 9 and extends to the edge of the second corner surface 11 on the other side. As a preferred embodiment, the seventh corrugated protrusion 15 forms a corrugated fold corner area 16 at the transition position of the middle inclined surface 9 and the first corner surface 10 and at the transition position of the middle inclined surface 9 and the second corner surface 11, respectively, and the corrugated fold corner area 16 is smoothly transitioned, concave or convex relative to the seventh corrugated protrusion 15.

[0084] As shown in Figure 12 , the fourth corrugated protrusion 12 and the sixth corrugated protrusion 14 are spliced between the adjacent first corner sealing film 7 and the second corner sealing film 8; the first corner surface 10 is spliced and connected with the circular planar area, and the second corner surface 11 is spliced and connected with the cylindrical curved surface area, as shown in Figure 5 .

[0085] The unsealed areas of the fourth corrugated protrusion 12, the fifth corrugated protrusion 13, the sixth corrugated protrusion 14 and the seventh corrugated protrusion 15 have the same cross section as the first corrugated protrusion 2; the fifth corrugated protrusion 13 is spliced and connected with the first corrugated protrusion 2 or the second corrugated protrusion 3; the seventh corrugated protrusion 15 is spliced and connected with the first corrugated protrusion 2 or the second corrugated protrusion 3.

[0086] As a preferred embodiment, as shown in Figure 5 , the fifth corrugated protrusion 13 on the first corner surface 10 of the first corner sealing film 7 is spliced and connected with the second corrugated protrusion 3 of the circular planar area, and the fifth corrugated protrusion 13 on the second corner surface 11 of the first corner sealing film 7 is spliced and connected with the second corrugated protrusion 3 of the cylindrical curved surface area; the seventh corrugated protrusion 15 on the first corner surface 10 of the second corner sealing film 8 is spliced and connected with the first corrugated protrusion 2 of the circular planar area, and the seventh corrugated protrusion 15 on the second corner surface 11 of the second corner sealing film 8 is spliced and connected with the first corrugated protrusion 2 of the cylindrical curved surface area.

[0087] In order to better prove the characteristics of the sealing film of the present embodiment, the plastic strain performance simulation of the sealing film in the present embodiment under temperature shock and pressure impact is carried out, as shown in Figure 13 and Figure 14 , and the specific process is as follows:

[0088] Figure 13The plastic strain simulation diagram of the sealing film in the embodiment from 20 DEG C to -183 DEG C is shown in the figure, and it can be seen from the figure that the maximum plastic strain of the sealing film is 1.39%, which is less than the design requirement of 5%, and only appears in a local position, and the plastic strain of most areas tends to be zero, which shows that the sealing film in the embodiment can effectively avoid the problem of loss of sealing performance of the sealing film caused by low temperature.

[0089] Figure 14 The plastic strain simulation diagram of the sealing film in the embodiment under vertical pressure load is shown in the figure, and it can be seen from the figure that the maximum plastic strain value is 0.0122%, which is far below the design requirement of 5%, and therefore, the sealing film in the embodiment has good ability to resist sloshing impact load. Embodiment

[0090] A land cylindrical low-temperature liquefied natural gas sealed and insulated storage tank, the storage tank is in a cylindrical shape, and a low-temperature liquefied gas sealed and insulated storage tank sealing film as in Embodiment 5 is arranged in the storage tank, and the material of the circular planar area, the cylindrical curved surface area and the two-face angle area of the sealing film is stainless steel, aluminum alloy or high manganese steel with a yield strength of 200 MPa to 600 MPa.

[0091] The embodiment is only a further explanation of the present application, and is not a limitation of the present application, and those skilled in the art can make non-creative modifications to the embodiment according to the needs after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A sealing film unit for a low-temperature liquefied gas sealed and insulated storage tank, characterized by, For a circular planar area, comprising a film base, the film base is a fan ring planar structure, the fan ring planar structure is centered on the center of the circular planar area, and a first corrugated protrusion with both ends open, a second corrugated protrusion with one end open, and a third corrugated protrusion with both ends closed are formed on the surface of the film base, and the first corrugated protrusion, the second corrugated protrusion and the third corrugated protrusion do not contact each other; the two ends of the first corrugated protrusion extend from the inside of the film base to the two side edges of the film base and stop at the edges of the film base to form an open structure; The first corrugated protrusion is arranged in the radial direction of the circular planar area or in the concentric circle direction; one end of the second corrugated protrusion extends along the other two side edges of the film base to the inside of the film base respectively, and the one end of the second corrugated protrusion forms an open structure at the edge of the film base, and the other end of the second corrugated protrusion forms a closed structure; when the first corrugated protrusion is arranged in the radial direction of the circular planar area, the second corrugated protrusion is arranged in the concentric circle direction of the circular planar area; when the first corrugated protrusion is arranged in the concentric circle direction of the circular planar area, the second corrugated protrusion is arranged in the radial direction of the circular planar area; the third corrugated protrusion is arranged between the second corrugated protrusions on both sides of the film base, and the two ends of the third corrugated protrusion are respectively towards the second corrugated protrusions on both sides; the direction of the third corrugated protrusion is consistent with the direction of the second corrugated protrusion.

2. A sealing film unit for a low-temperature liquefied gas sealed and insulated storage tank, characterized by For a cylindrical curved surface area, comprising a film base, the film base is a curved surface structure with the same radius as the arc surface of the cylindrical curved surface area, and a first corrugated protrusion with both ends open, a second corrugated protrusion with one end open, and a third corrugated protrusion with both ends closed are formed on the surface of the film base, and the first corrugated protrusion, the second corrugated protrusion and the third corrugated protrusion do not contact each other; the two ends of the first corrugated protrusion extend from the inside of the film base to the two side edges of the film base and stop at the edges of the film base to form an open structure; the first corrugated protrusion is arranged in the arc surface circumference direction of the cylindrical curved surface area or in the arc surface axial direction of the cylindrical curved surface area; one end of the second corrugated protrusion extends along the other two side edges of the film base to the inside of the film base respectively, and the one end of the second corrugated protrusion forms an open structure at the edge of the film base, and the other end of the second corrugated protrusion forms a closed structure; when the first corrugated protrusion is arranged in the arc surface circumference direction of the cylindrical curved surface area, the second corrugated protrusion is arranged in the arc surface axial direction of the cylindrical curved surface area; when the first corrugated protrusion is arranged in the arc surface axial direction of the cylindrical curved surface area, the second corrugated protrusion is arranged in the arc surface circumference direction of the cylindrical curved surface area; the third corrugated protrusion is arranged between the second corrugated protrusions on both sides of the film base, and the two ends of the third corrugated protrusion are respectively towards the second corrugated protrusions on both sides; the direction of the third corrugated protrusion is consistent with the direction of the second corrugated protrusion.

3. A sealing film for a low-temperature liquefied gas sealed and insulated storage tank, characterized by, The application relates to a sealing film unit, which comprises a circular plane area, a cylindrical curved surface area arranged around the circular plane area, the circular plane area comprises a plurality of fan-shaped annular first sealing film units, the cylindrical curved surface area comprises a plurality of second sealing film units with arc surfaces, the first sealing film units and the second sealing film units are provided with first corrugated protrusions with two open ends, second corrugated protrusions with one open end and third corrugated protrusions with two closed ends; the first sealing film units are arranged in a gradually increasing manner from the center to the outside along the radial direction of the circular plane area. In the circular plane area, the first corrugated protrusions of the first sealing film units are arranged along the radial direction of the circular plane area or arranged along the concentric circle direction; when the first corrugated protrusions of the first sealing film units are arranged along the radial direction of the circular plane area, the second corrugated protrusions of the first sealing film units are arranged along the concentric circle direction of the circular plane area; when the first corrugated protrusions of the first sealing film units are arranged along the concentric circle direction of the circular plane area, the second corrugated protrusions of the first sealing film units are arranged along the radial direction of the circular plane area; the direction of the third corrugated protrusions of the first sealing film units is consistent with the direction of the second corrugated protrusions of the first sealing film units.

4. The sealed film for a low-temperature liquefied gas sealed and insulated storage tank according to claim 3, characterized by In the cylindrical curved surface area, the first corrugated protrusions of the second sealing film units are arranged along the arc length direction of the cylindrical curved surface area or arranged along the arc axial direction of the cylindrical curved surface area; when the first corrugated protrusions of the second sealing film units are arranged along the arc length direction of the cylindrical curved surface area, the second corrugated protrusions of the second sealing film units are arranged along the arc axial direction of the cylindrical curved surface area; when the first corrugated protrusions of the second sealing film units are arranged along the arc axial direction of the cylindrical curved surface area, the second corrugated protrusions of the second sealing film units are arranged along the arc length direction of the cylindrical curved surface area; the direction of the third corrugated protrusions of the second sealing film units is consistent with the direction of the second corrugated protrusions of the second sealing film units.

5. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 4, characterized by In the circular plane area, the first corrugated protrusions and the second corrugated protrusions of two adjacent first sealing film units are spliced, and the directions of the first corrugated protrusions of the two adjacent first sealing film units are arranged along the radial direction of the circular plane area and arranged along the concentric circle direction of the circular plane area respectively; in the cylindrical curved surface area, the first corrugated protrusions and the second corrugated protrusions of two adjacent second sealing film units are spliced, and the directions of the first corrugated protrusions of the two adjacent second sealing film units are arranged along the arc length direction of the cylindrical curved surface area and arranged along the arc axial direction of the cylindrical curved surface area respectively.

6. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 3, characterized by The unsealed areas of the second corrugated protrusions and the third corrugated protrusions have the same cross section as the first corrugated protrusions.

7. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 6, characterized by The cross section of the first corrugated protrusions has a top arc, a connecting area arc symmetrically connected to the two sides of the top arc, and a transition area arc connected to the two sides of the connecting area arc, the connecting area arc is inscribed in the top arc, the transition area arc is circumscribed to the connecting area arc, and the transition area arc is circumscribed to the surface of the film base.

8. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 7, characterized by The top arc of the first corrugated protrusions is a circular arc, the connecting area arc is a circular arc, and the transition area arc is a circular arc. The distance between the middle part of the arc and the film base surface is H, the radius of the top arc is R1, the radius of the connecting area arc is R2, and the radius of the transition arc area is R3; wherein R1 1≤R1:R3≤3; 6≤R2:R3≤14; R2:H≤3.

9. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 6, characterized by The cross-section of the first corrugated protrusion has a parabolic line type which satisfies: where h is the parabolic The distance between the vertex of the linear line and the film base surface is h; a transition area arc is further provided between the parabolic line and the film base surface, and the parabolic line is smoothly connected to the film base surface through the transition area arc.

10. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 9, characterized by The radius of the transition area arc is R4, and the R4, h and X satisfy 0.1h≤R4≤0.3h, and the h satisfies 18mm≤h≤80mm, and the X satisfies 4≤|X|≤42.

11. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 3, characterized by The third wave-shaped convex is arranged between two first wave-shaped convexes, and one second wave-shaped convex is arranged on one side of the first wave-shaped convex and close to the two ends of the first wave-shaped convex respectively; the two ends of the third wave-shaped convex correspond to one second wave-shaped convex respectively.

12. The sealing film for a low-temperature liquefied gas sealing and insulating storage tank according to any one of claims 3 to 11, characterized by It also includes a two-face angle area region which is transitionally connected between the circular planar area and the cylindrical curved surface area.

13. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 12, characterized by The two-face angle area region includes a middle inclined surface, a first angle area surface arranged on one side of the middle inclined surface, and a second angle area surface arranged on the other side of the middle inclined surface, and the two-face angle area region is curved with the center of the circular planar area as the center, the first angle area surface is spliced and connected to the circular planar area, and the second angle area surface is spliced and connected to the cylindrical curved surface area.

14. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 13, characterized by The two-face angle area region includes a plurality of first angle area sealing films and a plurality of second angle area sealing films, and the first angle area sealing films and the second angle area sealing films are alternately connected to form an annular two-face angle area region.

15. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 14, characterized by The first angle area sealing film is provided with a fourth wave-shaped convex with open ends in the middle of the middle inclined surface and in the bending direction of the two-face angle area region, and the first angle area surface and the second angle area surface close to the two ends of the fourth wave-shaped convex are respectively provided with a fifth wave-shaped convex with one open end; the second angle area sealing film is provided with a sixth wave-shaped convex with one open end at each end in the middle of the middle inclined surface; two seventh wave-shaped convexes are further arranged between the two sixth wave-shaped convexes, and the two ends of the seventh wave-shaped convex are open, one end of the seventh wave-shaped convex starts along the edge of the first angle area surface on one side, and the other end of the seventh wave-shaped convex extends through the middle inclined surface and then extends to the edge of the second angle area surface on the other side.

16. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 15, characterized by The fourth wave-shaped convex and the sixth wave-shaped convex are spliced between adjacent first angle area sealing films and second angle area sealing films.

17. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 16, characterized by The non-closed regions of the fourth wave-shaped convex, the fifth wave-shaped convex, the sixth wave-shaped convex and the seventh wave-shaped convex have the same cross section as the first wave-shaped convex; the fifth wave-shaped convex is spliced and connected to the first wave-shaped convex or the second wave-shaped convex; and the seventh wave-shaped convex is spliced and connected to the first wave-shaped convex or the second wave-shaped convex.

18. The sealed film for a cryogenic liquefied gas sealed and insulated storage tank according to claim 17, characterized by The seventh wave-shaped convex forms a wave-shaped fold corner area at the position where the middle inclined surface transitions to the first angle area surface and at the position where the middle inclined surface transitions to the second angle area surface; and the wave-shaped fold corner area is smoothly transitioned, concave or convex relative to the seventh wave-shaped convex.

19. The cryogenic LNG sealed and insulated storage tank sealing membrane according to claim 12, wherein, The material of the circular planar region, the cylindrical curved surface region and the two-face-angle region is stainless steel, aluminum alloy or high manganese steel with a yield strength of 200-600 MPa.

20. A cylindrical, cryogenic, liquefied natural gas storage tank for land use, characterized by, The storage tank is cylindrical, and a sealing film for low-temperature liquefied gas sealed and insulated storage tanks as claimed in any one of claims 14-18 is arranged in the storage tank.

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