Composite pressure vessel with equatorial threaded boss for high temperature gas

Abstract

The application provides a high-temperature gas composite pressure vessel with an equatorial threaded boss, which comprises a metal inner liner, an equatorial threaded boss arranged in the middle of the metal inner liner, a heat insulation coating arranged on the inner surface of the metal inner liner, a glue-filling and grinding layer arranged on the outer surface of the metal inner liner, a fiber composite layer wound on the outer surface of the glue-filling and grinding layer, a circumferential composite layer wound on the outer surface of the glue-filling and grinding layer around the root of the equatorial threaded boss, an equatorial threaded boss reinforcing layer adhered to the area around the root of the equatorial threaded boss, an inner liner composite layer wound on the outer surface of the metal inner liner, and an equatorial threaded boss S-shaped composite layer wound on the circumferential outer surface of the equatorial threaded boss. The fiber composite layer is wound to solve the weight reduction problem of the pressure vessel for high-temperature gas, solve the high-temperature resistance problem of the conventional composite pressure vessel, reduce the winding blind area of the equatorial connection lug part, and has the characteristics of light weight, high-temperature resistance, reliable equatorial boss winding and the like.

Description

Technical Field

[0001] This invention relates to the field of pressure vessel structural design technology, specifically to a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion. Background Technology

[0002] In the field of high-temperature gas combustion, the future development goal is low cost and high carrying capacity. To achieve this goal, the first challenge is structural weight reduction. Pressure vessels are key components for weight reduction in high-temperature gas combustion power systems and structural systems. Compared to all-metal pressure vessels, high-temperature composite material wound pressure vessels offer numerous advantages, including lighter weight, higher rigidity, higher structural efficiency, higher reliability, a leak-before-burst safety failure mode (LBB), greater designability, lower production costs, and shorter development cycles, making them an important development direction.

[0003] The existing Chinese patent application document with publication number CN105674040B includes a composite material shell, a mounting flange installed at the equator position of the composite material shell, an adhesive layer filling the gap between the composite material shell and the mounting flange, and a composite material layer wrapped around the outer surface of the mounting flange. The composite material shell is a thin-walled spherical structure with a thickness δ to diameter D ratio of less than 0.004.

[0004] In existing technologies, high-temperature gas systems, based on the characteristics of their functions, typically require pressure vessels to meet specific installation requirements. Conventional high-temperature gas systems use all-metal pressure vessels, usually with equatorial flange connections. Due to the requirements for linear continuity in the high-temperature composite material winding process, as well as the compatibility requirements between the high-temperature resin and the winding, equatorial threaded bosses are usually not available, and only clamps or end-fixing methods can be used.

[0005] In existing technologies, high-temperature pressure vessels with equatorial mounting bosses for high-temperature gas mainly employ all-metal pressure vessels with equatorial flanges / boobs. However, due to the significant performance degradation of metals at high temperatures, these designs are heavy. Pressure vessels with equatorial flanges and room-temperature composite material winding cannot withstand the high-temperature environment of approximately 300°C for gas, and the winding blind zone at the flange is relatively large, indicating areas for improvement. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion.

[0007] According to the present invention, a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion includes a metal liner, a heat-insulating coating, a repair and finishing layer, and a fiber composite material layer. The metal liner has an equatorial threaded boss at its center. The heat-insulating coating is applied to the inner surface of the metal liner. The repair and finishing layer is disposed on the outer surface of the metal liner. The fiber composite material layer is wound around the outer surface of the repair and finishing layer. The fiber composite material layer includes a circumferential composite material layer, an equatorial threaded boss reinforcing layer, a liner composite material layer, and an S-shaped composite material layer of the equatorial threaded boss. The circumferential composite material layer is wound around the outer surface of the repair and finishing layer around the root of the equatorial threaded boss. The equatorial threaded boss reinforcing layer is coated and bonded to the area around the root of the equatorial threaded boss. The liner composite material layer is wound around the outer surface of the metal liner. The S-shaped composite material layer of the equatorial threaded boss is wound around the circumferential outer surface of the equatorial threaded boss.

[0008] Preferably, the shape of the metal liner includes a sphere, a spherical cylinder, or an ellipsoid; the metal liner includes an upper shell, a connecting ring, and a lower shell that are welded together in sequence, and the equatorial threaded boss is provided at intervals along the circumference of the connecting ring.

[0009] Preferably, the number of equatorial threaded bosses spaced circumferentially on the connecting ring is an even number between 6 and 24.

[0010] Preferably, the distance between any two adjacent equatorial threaded bosses is 120mm to 150mm.

[0011] Preferably, the metal liner is made of aluminum alloy or titanium alloy; the wall thickness of the metal inner wall is 0.5 mm to 1.5 mm.

[0012] Preferably, the root of the equatorial threaded boss is chamfered around its perimeter, and the chamfer is not less than R2; the height of the equatorial threaded boss is not greater than 0.2mm.

[0013] Preferably, the heat insulation coating is a homogeneous thin-layer non-metallic material, which is bonded to the inner side of the metal lining through a spraying and curing process, with a thickness of 0.2mm to 1.5mm, and can withstand high temperatures above 300℃.

[0014] Preferably, the repair and polishing layer includes a white carbon / polyetheramine curing agent layer; the thickness of the repair and polishing layer is 0.1 mm to 0.3 mm.

[0015] Preferably, the fiber composite material layer is prepared from one or more of carbon fiber, glass fiber, and organic fiber.

[0016] Preferably, the circumferential composite material layer, the inner lining composite material layer, and the equatorial threaded boss S-shaped composite material layer are fiber / phthalic anhydride resin layers;

[0017] The equatorial threaded boss reinforcement layer is a cross-fiber cloth / phthalic nitrile resin layer;

[0018] The number of layers of the equatorial threaded boss reinforcement layer is set to be 0.6 to 1 times the number of layers of the inner lining composite material layer;

[0019] The width of the circumferential composite material layer is set to 1.1 to 1.3 times the height of the fiber winding blind zone;

[0020] The length of the equatorial threaded boss reinforcement layer is set to 1.3 to 1.5 times the height of the equatorial boss triangle area, and the width is set to 1.2 to 1.5 times the width of the equatorial threaded boss.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention solves the weight reduction problem of pressure vessels used for high-temperature gas by winding fiber composite material layers, solves the high temperature resistance problem of conventional composite material pressure vessels, reduces the winding blind area at the equatorial connecting lug, and has the characteristics of light weight, high temperature resistance, and high reliability of equatorial boss winding. Attached Figure Description

[0023] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a cross-sectional view illustrating the overall structure of the pressure vessel in Embodiment 1 of the present invention;

[0025] Figure 2 This is a top view illustrating the overall structure of the connecting ring, which is the main feature of this invention.

[0026] Figure 3 This is a cross-sectional schematic diagram illustrating the overall structure of the connecting ring, which is the main feature of this invention.

[0027] Figure 4 This is a schematic diagram illustrating the overall structure of the fiber composite material layer, which is the main feature of this invention.

[0028] Figure 5 This is a cross-sectional view of the overall structure of the pressure vessel in Variation Example 1, which is the main embodiment of the present invention.

[0029] Figure 6 This is a cross-sectional view of the overall structure of the pressure vessel in Variation Example 2, which is the main embodiment of the present invention.

[0030] The figure shows: 1. Metal liner; 2. Upper shell; 12. Connecting ring; 13. Lower shell; 2. Heat insulation coating; 3. Repair and grinding layer; 4. Fiber composite material layer; 41. Circumferential composite material layer; 42. Equatorial threaded boss reinforcement layer; 43. Liner composite material layer; 44. Equatorial threaded boss S-shaped composite material layer. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0032] Example 1

[0033] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion according to the present invention includes a metal liner 1, a heat-insulating coating 2, a repair and finishing layer 3, and a fiber composite material layer 4. An equatorial threaded boss is provided in the center of the metal liner 1. The heat-insulating coating 2 is applied to the inner surface of the metal liner 1, the repair and finishing layer 3 is disposed on the outer surface of the metal liner 1, and the fiber composite material layer 4 is wound around the outer surface of the repair and finishing layer 3.

[0034] The fiber composite material layer 4 includes a circumferential composite material layer 41, an equatorial threaded boss reinforcing layer 42, an inner lining composite material layer 43, and an equatorial threaded boss S-shaped composite material layer 44. The circumferential composite material layer 41 is wrapped around the outer surface of the glue-repairing layer 3 around the root of the equatorial threaded boss. The equatorial threaded boss reinforcing layer 42 is coated and bonded to the area around the root of the equatorial threaded boss. The inner lining composite material layer 43 is wrapped around the outer surface of the metal inner lining 1. The equatorial threaded boss S-shaped composite material layer 44 is wrapped around the circumferential outer surface of the equatorial threaded boss.

[0035] Specifically, the metal liner 1 is spherical in shape and includes an upper shell 11, a connecting ring 12, and a lower shell 13, which are sequentially welded together. The metal liner 1 is made of aluminum alloy or titanium alloy, and the wall thickness of the metal inner wall is 0.5 mm to 1.5 mm. The connecting ring 12 has an annular structure and includes a number of circumferentially distributed equatorial threaded bosses. The diameter of the equatorial threaded bosses is determined by the load they bear. The equatorial threaded bosses are spaced apart on the connecting ring 12 along its circumference. The number of equatorial threaded bosses spaced apart on the connecting ring 12 along its circumference is an even number between 6 and 24, inclusive.

[0036] It is important to note that the spacing between any two adjacent equatorial thread bosses should be 120mm to 150mm. The spacing between adjacent equatorial thread bosses should not be too small to avoid severe fiber accumulation at the root of the equatorial thread boss during fiber entanglement, and to prevent large blind areas without fiber entanglement on both sides of the equatorial thread boss. A chamfer, not less than R2, should be provided around the root of the equatorial thread boss to prevent damage to the fibers during entanglement. The height H1 of the equatorial thread boss should not exceed 0.2mm, and the height of the bosses between the equatorial thread bosses of the connecting ring 12 should be as low as possible to avoid fiber bridging in the areas above and below the bosses during fiber entanglement.

[0037] Furthermore, the heat insulation coating 2 is a homogeneous, thin-film non-metallic material, which is bonded to the inner side of the metal liner 1 through a spraying and curing process, with a thickness of 0.2 mm to 1.5 mm, and can withstand temperatures above 300°C. The repair and polishing layer 3 includes a white carbon / polyetheramine curing agent layer; the thickness of the repair and polishing layer 3 is 0.1 mm to 0.3 mm.

[0038] The fiber composite layer 4 is made of one or more of the following materials: carbon fiber, glass fiber, and organic fiber. Furthermore, the circumferential composite layer 41, the inner lining composite layer 43, and the equatorial threaded boss S-shaped composite layer 44 are fiber / phthalic acid resin layers. The equatorial threaded boss reinforcing layer 42 is a cross-fiber cloth / phthalic acid resin layer.

[0039] The number of layers of the inner lining composite material layer 43 is determined by the bearing pressure of the pressure vessel, and the number of layers of the equatorial threaded boss reinforcement layer 42 is set to be 0.6 to 1 times the number of layers of the inner lining composite material layer 43.

[0040] The width of the circumferential composite layer 41 is determined by the height of the fiber winding blind zone in the upper and lower regions of the equatorial convexity. The width of the circumferential composite layer 41 is set to 1.1 to 1.3 times the height of the fiber winding blind zone.

[0041] The cross-fiber cloth of the equatorial threaded boss reinforcement layer 42 should be able to cover the fiber entanglement blind area of ​​the equatorial boss. The length of the equatorial threaded boss reinforcement layer 42 is set to 1.3 to 1.5 times the height of the triangular area of ​​the equatorial boss, and the width is set to 1.2 to 1.5 times the width of the equatorial threaded boss.

[0042] The technical solution of this application solves the problem of weight reduction for pressure vessels used for high-temperature gas, solves the problem of high temperature resistance of conventional composite material pressure vessels, reduces the winding blind area at the equatorial connecting lug, and has the characteristics of light weight, high temperature resistance, and high reliability of equatorial boss winding.

[0043] Variant Example 1

[0044] like Figure 5As shown in Embodiment 1, according to the present invention, a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion is provided, wherein the metal liner 1 is spherical in shape.

[0045] Variant Example 2

[0046] like Figure 6 As shown in Embodiment 1, according to the present invention, a composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion is provided, wherein the metal liner 1 is spherical in shape.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion, characterized in that, It includes a metal liner (1), a heat insulation coating (2), a repair and polishing layer (3), and a fiber composite material layer (4). The metal liner (1) is provided with an equatorial threaded boss in the middle. The heat insulation coating (2) is applied to the inner surface of the metal liner (1), the adhesive repair layer (3) is applied to the outer surface of the metal liner (1), and the fiber composite material layer (4) is wrapped around the outer surface of the adhesive repair layer (3). The fiber composite material layer (4) includes a circumferential composite material layer (41), an equatorial threaded boss reinforcing layer (42), an inner lining composite material layer (43), and an equatorial threaded boss S-shaped composite material layer (44). The circumferential composite material layer (41) is wrapped around the outer surface of the glue-repairing and grinding layer (3) around the root of the equatorial threaded boss. The equatorial threaded boss reinforcing layer (42) is coated and bonded to the area around the root of the equatorial threaded boss. The inner lining composite material layer (43) is wrapped around the outer surface of the metal inner lining (1). The equatorial threaded boss S-shaped composite material layer (44) is wrapped around the circumferential outer surface of the equatorial threaded boss. The circumferential composite material layer (41), the inner lining composite material layer (43), and the equatorial threaded boss S-type composite material layer (44) are fiber / phthalic acrylonitrile resin layers; The equatorial threaded boss reinforcement layer (42) is a cross-fiber cloth / phthalic anhydride resin layer; The number of layers of the equatorial threaded boss reinforcement layer (42) is set to be 0.6 to 1 times the number of layers of the inner lining composite material layer (43); The width of the circumferential composite material layer (41) is set to 1.1 to 1.3 times the height of the fiber winding blind zone; The length of the equatorial threaded boss reinforcement layer (42) is set to 1.3 to 1.5 times the height of the equatorial boss triangle area, and the width is set to 1.2 to 1.5 times the width of the equatorial threaded boss.

2. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 1, characterized in that, The shape of the metal liner (1) includes a sphere, a spherical cylinder, or an ellipsoid; The metal liner (1) includes an upper shell (11), a connecting ring (12) and a lower shell (13) that are welded together in sequence. The equatorial threaded boss is arranged on the connecting ring (12) at intervals along the circumference of the connecting ring (12).

3. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 2, characterized in that, The number of equatorial threaded bosses spaced circumferentially along the connecting ring (12) on the connecting ring (12) is an even number between 6 and 24.

4. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 2, characterized in that, The spacing between any two adjacent equatorial threaded bosses is 120 mm to 150 mm.

5. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 1, characterized in that, The metal liner (1) is made of aluminum alloy or titanium alloy; The wall thickness of the metal liner is 0.5 mm to 1.5 mm.

6. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 1, characterized in that, The root of the equatorial threaded boss is chamfered around its perimeter, and the chamfer is not less than R2. The height of the equatorial threaded boss is no greater than 0.2 mm.

7. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 1, characterized in that, The heat insulation coating (2) is a homogeneous thin-layer non-metallic material that is bonded to the inside of the metal lining (1) through a spraying and curing process. The thickness is 0.2 mm to 1.5 mm and it can withstand temperatures above 300°C.

8. The high-temperature gas-fired composite material pressure vessel with an equatorial threaded boss as described in claim 1, characterized in that, The repair and polishing layer (3) includes a white carbon / polyetheramine curing agent layer; The thickness of the repair and polishing layer (3) is 0.1 mm to 0.3 mm.

9. The composite material pressure vessel with an equatorial threaded boss for high-temperature gas combustion as described in claim 1, characterized in that, The fiber composite material layer (4) is prepared from one or more of carbon fiber, glass fiber, and organic fiber.

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