Composite material phase change pipe body structure

Abstract

The utility model provides a composite material phase change pipe body structure. The composite material phase change pipe body structure comprises a phase change pipe body, the phase change pipe body comprises a low alloy steel pipe body lining, and the inner wall and the outer wall of the low alloy steel pipe body lining are each provided with a non-polar anti-corrosion protective coating. A reinforced winding layer is arranged on the non-polar anti-corrosion protective coating on the outer wall of the low-alloy steel pipe body lining; and a paint coating layer is arranged on the reinforced winding layer. The low-alloy steel pipe body lining is combined with the non-polar anti-corrosion protective coating to replace a traditional titanium alloy material lining, so that the anti-corrosion effect is guaranteed, and meanwhile the effect of reducing the cost is achieved.

Description

Technical Field

[0001] The utility model relates to the field of phase change tubes, in particular to a composite material phase change tube structure. Background Art

[0002] The phase-change tube is a high-pressure pressure vessel used in the ejection power unit during cold launch, storing supercritical carbon dioxide and withstanding the high pressures of launch. During launch, an excitation device rapidly vaporizes the supercritical carbon dioxide, instantly raising the pressure from 1-25 MPa to over 80 MPa. This high pressure pushes open the rupture disc at the release end, providing the power unit for ejection from the launch tube. During storage and other operating conditions, the tube's inner wall must meet corrosion protection requirements for the supercritical carbon dioxide.

[0003] The phase change tubes of the current mainstream domestic catapult power units are all lined with titanium alloys such as TC4 and TA2, and the exterior is reinforced with carbon fiber wet winding to form a high-pressure pressure vessel structure. This meets the corrosion issues during supercritical carbon dioxide storage and environmental adaptability issues such as salt spray and humidity. However, the catapult power unit is generally a key component of a disposable subsystem in the launch system, and titanium alloy is an important strategic material with low production. Using titanium alloy for the phase change tube significantly increases its cost and causes waste. Utility Model Content

[0004] In order to solve the technical problem of excessively high costs, the utility model provides a composite material phase change tube structure.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a composite material phase change tube structure, including a phase change tube body; the phase change tube body includes a low-alloy steel tube body lining, and the inner and outer walls of the low-alloy steel tube body lining are both provided with a non-polar anti-corrosion protective coating; the non-polar anti-corrosion protective coating located on the outer wall of the low-alloy steel tube body lining is provided with a reinforcing winding layer; and the reinforcing winding layer is provided with a paint coating layer.

[0007] In this technical solution, a low-alloy steel pipe inner lining combined with a non-polar anti-corrosion protective coating is used to replace the traditional titanium alloy inner lining, thereby ensuring the anti-corrosion effect while reducing costs.

[0008] Preferably, the non-polar anti-corrosion protective coating is formed by spraying a non-polar organic material onto the inner and outer walls of the inner lining of the low alloy steel pipe and solidifying the coating.

[0009] Preferably, the thickness of the non-polar anti-corrosion protective coating is 30-50 μm.

[0010] In this technical solution, the non-polar anti-corrosion protective coating is used to isolate supercritical carbon dioxide and avoid direct contact with the inner lining of the low-alloy steel pipe. The non-polar organic material used has a chemical bond that is not easily reactive with carbon dioxide, thereby achieving the purpose of corrosion protection.

[0011] Preferably, the material of the reinforcing winding layer is T700 grade carbon fiber.

[0012] Preferably, the material of the paint coating layer is acrylic polyurethane topcoat.

[0013] In this technical solution, the reinforcing wrapping layer is used to enhance the ability to resist compression.

[0014] Preferably, the paint coating layer has a thickness of 20 to 50 μm.

[0015] In this technical solution, the paint coating layer plays a protective role and can meet the environmental adaptability requirements such as mold, salt spray, etc.

[0016] Preferably, it also includes a suspension mechanism; the suspension mechanism includes a straight rod, a hanging ring and a blocking ball; the top end of the straight rod is fixed to the hanging ring, the bottom end of the straight rod is detachably connected to the blocking ball, and the straight rod passes through the phase change tube body along the axial direction.

[0017] Preferably, the diameter of the blocking ball is larger than the caliber of the phase change tube body.

[0018] Preferably, the top of the blocking ball is provided with a flat surface for contacting the bottom end of the phase change tube body.

[0019] Preferably, a threaded hole is provided on the top of the blocking ball, a stud is fixed to the bottom end of the straight rod, and the stud is threadedly connected to the threaded hole.

[0020] In this technical solution, the hanging mechanism is used to facilitate the hanging of the enhanced wrapping layer in the electric drying oven during the curing and drying process.

[0021] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0022] The positive progress effect of this utility model is:

[0023] The composite phase change tube structure proposed above forms an inner lining by processing low-cost low-alloy materials, and arranges a non-polar anti-corrosion protective coating on the inner and outer surfaces of the inner lining. Since the non-polar anti-corrosion protective coating is a non-polar organic material, its chemical bonds are not easily reacted with carbon dioxide, thereby achieving the purpose of isolating supercritical carbon dioxide from direct contact with the metal lining and playing an anti-corrosion role. Compared with the use of titanium alloy materials as the inner lining, the above scheme achieves anti-corrosion effect under supercritical carbon dioxide while reducing costs and saving strategic resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the utility model as a whole.

[0025] Figure 2 This is a structural diagram of the phase change tube body of the utility model.

[0026] Figure 3 It is a cross-sectional schematic diagram of the inner lining of the low alloy steel pipe of the utility model.

[0027] Figure 4 It is a structural diagram of the suspension mechanism of the utility model.

[0028] Description of Reference Numerals

[0029] 1. Phase change tube body; 101. Low alloy steel tube inner lining; 102. Non-polar anti-corrosion protective coating; 103. Reinforced winding layer; 104. Paint coating layer;

[0030] 2. Suspension mechanism; 201. Straight rod; 202. Lifting ring; 203. Ball stop; 2031. Threaded hole; 204. Stud. DETAILED DESCRIPTION

[0031] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0032] like Figure 1-4 As shown, a composite material phase change tube structure includes a phase change tube body 1; the phase change tube body 1 includes a low alloy steel tube body lining 101, and the inner and outer walls of the low alloy steel tube body lining 101 are both provided with a non-polar anti-corrosion protective coating 102; the non-polar anti-corrosion protective coating 102 located on the outer wall of the low alloy steel tube body lining 101 is provided with a reinforcing winding layer 103; the reinforcing winding layer 103 is provided with a paint coating layer 104.

[0033] The low alloy steel pipe body lining 101 is formed by selecting low alloy steel or high strength steel seamless pipes and forgings (bars) with low temperature impact toughness ≥30J, and the material is Q355E, 30CrMo, 09MnNiD, 16MnD, Q345F, etc., and then laser welding or argon arc welding is used after machining. After processing, the low alloy steel pipe body lining 101 is as follows Figure 3 shown.

[0034] The non-polar anti-corrosion protective coating 102 is formed by spraying a non-polar organic material onto the inner and outer walls of the low alloy steel pipe lining 101 and then solidifying the material.

[0035] The thickness of the non-polar anti-corrosion protective coating 102 is 30-50 μm.

[0036] In the prior art, the phase change tube 1 used in the ejection power unit is generally made of TC4 titanium alloy to prevent supercritical carbon dioxide from corroding the lining and causing problems such as tube failure.

[0037] Supercritical carbon dioxide, under the combined effects of temperature and pressure, causes extremely complex corrosion phenomena on pipes and containers. This is mainly because supercritical carbon dioxide, in the presence of impurities such as H2O and S, causes severe corrosion on the metal surface. Supercritical carbon dioxide is a strong extractant. Under the action of supercritical carbon dioxide, the solvent of general coatings is easily extracted, causing the coating to delaminate and peel off. Therefore, under the premise of low cost, it is necessary to protect the metal parts of the inner wall and outer surface of the pipe body by selecting appropriate anti-corrosion measures to achieve the service life requirements specified in the design.

[0038] Among them, supercritical carbon dioxide has good compatibility with non-polar polymer materials during storage. The utility model specifically achieves the purpose of corrosion prevention by spraying ultra-high molecular weight polyethylene, polytetrafluoroethylene, Teflon and other coatings.

[0039] After the low-alloy steel pipe lining 101 is welded and formed, the inner and outer surfaces are degreased, derusted, and cleaned. Then, electrostatic spraying of Teflon, polytetrafluoroethylene, or ultra-high molecular weight polyethylene powder or paint is applied. After curing at 200-300°C, a dense, continuous, 30-50μm non-polar corrosion protection coating 102 is formed on the interior and surface. This prevents direct contact between supercritical carbon dioxide and the metal lining. The sprayed non-polar corrosion protection coating 102 is a non-polar organic material whose chemical bonds are less likely to react with carbon dioxide, achieving the desired corrosion protection. This coating is wear-resistant, scratch-resistant, and corrosion-resistant.

[0040] Through the above technical solution, compared with titanium alloy precious metal lining, the requirements of corrosion resistance, safety and reliability can be achieved at a low cost.

[0041] Furthermore, the material of the reinforcing winding layer 103 is T700 grade carbon fiber.

[0042] The reinforced winding layer 103 is formed by continuously wet-winding T700 grade carbon fiber to the non-polar corrosion protection coating 102 on the outer wall of the low alloy steel pipe body liner 101 .

[0043] After winding, the semi-finished product is rotated and cured in an electric drying oven with controllable temperature. After curing, it is subjected to a water pressure test at 130MPa to 200MPa. Semi-finished products that pass the water pressure test are placed in an oven and baked at 60-75℃ for 2-3 hours to remove any residual moisture from the water pressure test.

[0044] As a specific technical solution, the paint coating layer 104 is made of acrylic polyurethane topcoat and has a thickness of 20 to 50 μm.

[0045] After the reinforcing winding layer 103 is formed, the surface is polished. After being polished and smoothed, acrylic polyurethane topcoat is sprayed with a paint film thickness of 20 to 50 μm to form a paint coating layer 104 .

[0046] The paint coating layer 104 plays a protective role and can meet the requirements of environmental adaptability such as mold, salt spray, etc.

[0047] like Figure 1 and Figure 4 As shown, it also includes a suspension mechanism 2; the suspension mechanism 2 includes a straight rod 201, a hanging ring 202 and a blocking ball 203; the top end of the straight rod 201 is fixedly connected to the hanging ring 202, and the bottom end of the straight rod 201 is detachably connected to the blocking ball 203, and the straight rod 201 passes through the phase change tube body 1 along the axial direction.

[0048] The diameter of the blocking ball 203 is larger than the diameter of the phase change tube 1 .

[0049] The top of the blocking ball 203 is provided with a flat surface for contacting the bottom end of the phase change tube 1 .

[0050] A threaded hole 2031 is formed on the top of the blocking ball 203 , and a stud 204 is fixed to the bottom end of the straight rod 201 . The stud 204 is threadedly connected to the threaded hole 2031 .

[0051] After the formation of the reinforced winding layer 103, the phase change tube body 1 is suspended by the suspension mechanism 2 when it is dried in an electric drying oven. When the suspension mechanism 2 and the phase change tube body 1 are installed, the straight rod 201 is passed through the phase change tube body 1, and the blocking ball 203 is threadedly connected to the stud 204 through the threaded hole 2031. The bottom end of the phase change tube body 1 contacts the top side plane of the blocking ball 203 to bear the weight of the phase change tube body 1, and then is suspended in the electric drying oven through the hanging ring 202 for drying; after drying, the suspension mechanism 2 and the phase change tube body 1 are removed from the electric drying oven, the blocking ball 203 is rotated to separate the threaded column and the threaded hole 2031, and the blocking ball 203 is removed. After removal, the phase change tube body 1 can be removed.

[0052] In a specific implementation, a hook is provided in the electric drying oven, and the suspension mechanism 2 is hung on the hook through a hanging ring 202 so as to be placed in the electric drying oven. Furthermore, the hook is rotatably installed and connected to a motor, which drives the hook to rotate, so that the suspension mechanism 2 and the phase change tube body 1 rotate together, and drying is performed in a rotating state.

[0053] The present invention is not limited to the above-described embodiments. Any changes in shape or structure fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A composite material phase change tube structure, characterized in that: It includes a phase change tube body (1); The phase change tube body (1) comprises a low alloy steel tube body lining (101), and both inner and outer walls of the low alloy steel tube body lining (101) are provided with a non-polar anti-corrosion protective coating (102); A reinforcing winding layer (103) is provided on the non-polar anti-corrosion protective coating (102) located on the outer wall of the low-alloy steel pipe inner lining (101); and a paint coating layer (104) is provided on the reinforcing winding layer (103).

2. A composite material phase change tube structure according to claim 1, characterized in that: The non-polar anti-corrosion protective coating (102) is formed by spraying a non-polar organic material onto the inner and outer walls of the low alloy steel pipe lining (101) and then solidifying the coating.

3. The composite material phase change tube structure according to claim 1, characterized in that: The thickness of the non-polar anti-corrosion protective coating (102) is 30-50 μm.

4. The composite phase change tube structure according to claim 1, characterized in that: The material of the reinforcing winding layer (103) is T700 grade carbon fiber.

5. The composite material phase change tube structure according to claim 1, characterized in that: The material of the paint coating layer (104) is acrylic polyurethane topcoat.

6. The composite material phase change tube structure according to claim 1, characterized in that: The thickness of the paint coating layer (104) is 20 to 50 μm.

7. The composite material phase change tube structure according to claim 1, characterized in that: It also includes a suspension mechanism (2); the suspension mechanism (2) includes a straight rod (201), a hanging ring (202), and a blocking ball (203); the top end of the straight rod (201) is fixedly connected to the hanging ring (202), the bottom end of the straight rod (201) is detachably connected to the blocking ball (203), and the straight rod (201) passes through the phase change tube (1) along the axial direction.

8. The composite material phase change tube structure according to claim 7, characterized in that: The diameter of the blocking ball (203) is larger than the caliber of the phase change tube (1).

9. The composite material phase change tube structure according to claim 7, characterized in that: The top of the blocking ball (203) is provided with a plane for contacting the bottom end of the phase change tube (1).

10. The composite material phase change tube structure according to claim 7, characterized in that: A threaded hole (2031) is provided on the top of the blocking ball (203), a stud (204) is fixed to the bottom end of the straight rod (201), and the stud (204) is threadedly connected to the threaded hole (2031).

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