A ring-shaped pressure vessel structure
By 3D printing a plastic inner liner and adding a shoulder to the valve seat, combined with a carbon fiber reinforcement layer, the defect problem at the joint between the valve seat and the plastic inner liner was solved, achieving better sealing and mechanical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG JUHE INVESTMENT DEV CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-05-26
AI Technical Summary
Defects are prone to occur at the joint between the valve seat and the plastic inner liner of existing annular pressure vessels, affecting sealing performance and mechanical properties.
The plastic inner liner is manufactured using 3D printing technology, and a shoulder is added to the valve seat. The shoulder is embedded in the plastic inner liner, and combined with a carbon fiber reinforcement layer, the wall thickness of the plastic inner liner is increased to support the valve seat. Metal valve seats and sealing rings are used to ensure airtightness.
It improves the mechanical stability and sealing performance of the annular pressure vessel, avoids defects caused by excessively thin walls, and ensures that gas is not easily leaked.
Smart Images
Figure CN224284229U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure vessel technology, and in particular to an annular pressure vessel structure. Background Technology
[0002] Pressure vessels are mainly used to hold high-pressure gases such as liquefied petroleum gas, nitrogen, and hydrogen. A valve seat extends from the cylinder as the gas outlet. The valve seat of a Type IV pressure vessel is made of metal, while the inner liner of the cylinder is made of plastic. Ensuring a safe and reliable seal between the metal valve seat and the plastic inner liner is the key issue for Type IV pressure vessels.
[0003] Patent CN118602270A discloses a novel annular pressure vessel in which a valve seat is embedded in the inner wall of the annular vessel. Due to the thick inner fiber and the pressure it experiences, this characteristic allows for a tighter connection between the valve seat structure and the pressure vessel body, thereby improving its mechanical strength and airtightness. However, the valve seat embedding in this annular pressure vessel is integrally molded with the plastic inner liner, making the joint prone to defects. Furthermore, because the plastic inner liner has a thin wall, it is difficult to provide strong support for the metal valve seat during the carbon fiber winding stage, easily leading to defects and affecting the mechanical and sealing performance of the annular pressure vessel. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an annular pressure vessel structure, which has better mechanical properties and better sealing effect.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] This utility model provides a ring-shaped pressure vessel structure, including a pressure vessel body, which is a ring structure. The wall of the pressure vessel body is provided with a plastic inner liner and a carbon fiber reinforcement layer from the inside to the outside. The inside of the plastic inner liner forms a hollow cavity, and the radial cross-section of the hollow cavity is circular.
[0007] A valve seat is provided on the inner wall of the pressure vessel body; the valve seat is connected to the hollow cavity through a connecting channel in the plastic inner liner.
[0008] The valve seat includes a hollow cylindrical structure and a shoulder disposed on the outer wall of the hollow cylindrical structure. The shoulder is embedded in a plastic inner liner, and the wall thickness of the plastic inner liner at the valve seat is greater than the axial length of the hollow cylindrical structure.
[0009] Preferably, the shoulder is disposed between the plastic inner liner and the carbon fiber reinforcement layer.
[0010] Preferably, the hollow cylindrical structure is provided with internal threads, which are used for installing valves.
[0011] Furthermore, the hollow cylindrical structure has a first sealing groove and a second sealing groove on the side of the internal thread near the hollow cavity, and the first sealing groove and the second sealing groove are separated by a set distance.
[0012] Furthermore, a retaining ring is installed in the first sealing groove, and a sealing ring is installed in the second sealing groove.
[0013] Preferably, the outer contour of the shoulder is flush with the inner ring surface of the pressure vessel body.
[0014] Preferably, the shoulder is provided with a protruding insert ring that is inserted into a slot in the plastic inner liner.
[0015] Furthermore, a sealing ring is placed in the slot of the plastic inner liner.
[0016] Preferably, the shoulder is located near the top of the outer wall surface of the hollow column structure on the side away from the hollow cavity.
[0017] Preferably, the thickness of the plastic inner liner at the valve seat is 2 to 4 times the axial length of the hollow cylindrical structure.
[0018] The beneficial effects of this utility model are as follows:
[0019] In the annular pressure vessel structure provided by this utility model, the wall thickness of the plastic inner liner at the valve seat is greater than the axial length of the hollow cylindrical structure, and the shoulder of the valve seat is embedded in the plastic inner liner. With the support of the thicker plastic inner liner, the mechanical stability of the annular pressure vessel structure is improved, avoiding defects caused by the excessively thin wall thickness when winding the carbon fiber reinforcement layer, and the sealing performance is better. Attached Figure Description
[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0021] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.
[0022] Figure 1 This is a schematic diagram of the annular pressure vessel structure in an embodiment of this utility model.
[0023] Figure 2 This utility model Figure 1 Cross-sectional view at point BB.
[0024] Figure 3 This utility model Figure 1Enlarged view of point A in the middle.
[0025] Figure 4 This is a schematic diagram of the valve seat of this utility model.
[0026] Among them, 1. Pressure vessel body; 2. Plastic inner liner; 201. Slot; 3. Carbon fiber reinforcement layer; 4. Valve seat; 401. Hollow cylindrical structure; 402. Shoulder; 403. Internal thread; 404. Protruding insert ring; 405. First sealing groove; 406. Second sealing groove; 5. Hollow cavity; 6. Connecting channel. Detailed Implementation
[0027] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] Example
[0030] Reference Figures 1 to 4 This embodiment provides an annular pressure vessel structure, including a pressure vessel body 1, which is an annular structure. The wall of the pressure vessel body 1 is provided with a plastic inner liner 2 and a carbon fiber reinforcement layer 3 from the inside to the outside. A valve seat 4 is provided on the inner wall of the pressure vessel body 1.
[0031] The plastic inner liner 2 has a hollow cavity 5 inside, and the radial cross-section of the hollow cavity 5 is circular. The valve seat 4 is connected to the hollow cavity 5 through the connecting channel 6 in the plastic inner liner 2. In this embodiment, the overall structure of the plastic inner liner 2 is obtained by 3D printing. The traditional manufacturing of annular pressure vessels usually involves pre-embedding the valve seat 4 and then using blow molding, injection molding, or rotational molding processes to integrally form it with the plastic inner liner 2. This method not only requires large molds, which is costly, but also easily leads to defects at the joint between the valve seat 4 and the plastic inner liner 2. In addition, the annular structure can only be injection molded separately, and then a welding process is used to weld the two halves of the ring together, resulting in defects at the weld joint of the formed annular inner liner. However, the 3D printing method does not require pre-embedding the valve seat 4. The valve seat 4 and the plastic inner liner 2 are designed separately, which is beneficial to improving the stability of the structure.
[0032] The plastic inner liner 2 is preferably made of ABS resin, which has good mechanical stability, excellent air and moisture barrier properties, and is not prone to chemical reactions, making it suitable as the main material for pressure vessels. The valve seat 4 is made of metal, which has high strength and good sealing performance, can withstand the pressure of high-pressure gas, effectively prevents gas leakage, and ensures the sealing and safety of the pressure vessel.
[0033] like Figure 4 As shown, the valve seat 4 includes a hollow cylindrical structure 401 and a shoulder 402 disposed on the outer wall of the hollow cylindrical structure. The outer contour of the shoulder 402 is flush with the inner ring surface of the pressure vessel body 1, achieving a smooth transition. The shoulder 402 presents a "saddle-shaped" structure, which is designed to facilitate fiber winding, making the carbon fiber reinforcement layer dense and possessing superior mechanical properties. The shoulder 402 is provided with a protruding insert ring 404 that is inserted into the slot 201 of the plastic inner liner 2, and at least one protruding insert ring 404 is provided. A sealing ring is placed in the slot 201 of the plastic inner liner 2 for sealing, further improving airtightness. The top of the outer wall of the shoulder 402, near the side of the hollow cylindrical structure 401 away from the hollow cavity 5, is designed to ensure that the plastic inner liner 2 provides effective support for the valve seat 4 and facilitates the winding of carbon fiber.
[0034] like Figure 3 As shown, the shoulder 402 is disposed between the plastic inner liner 2 and the carbon fiber reinforcement layer 3. Since the valve seat 4 is arranged on the inner wall of the pressure vessel body 1, the inner ring of the pressure vessel body 1 is subjected to compressive stress. Under the mechanical protection and compressive stress of the carbon fiber reinforcement layer 3, the shoulder 402 is tightly embedded in the plastic inner liner 2, achieving an effective sealing effect.
[0035] like Figure 3 As shown, the wall thickness of the plastic inner liner 2 at valve seat 4 is greater than the axial length of the hollow cylindrical structure 401. This design is to give the plastic inner liner 2 at valve seat 4 a larger thickness, thereby enabling the plastic inner liner 2 to effectively support valve seat 4, preventing damage during carbon fiber winding, and improving mechanical stability. More preferably, the wall thickness of the plastic inner liner 2 at valve seat 4 is 2 to 4 times the axial length of the hollow cylindrical structure 401. Since the radial cross-section of the hollow cavity 5 is circular, the radial cross-sectional diameter of the hollow cavity 5 at valve seat 4 is smaller than that at other locations.
[0036] The hollow cylindrical structure 401 is provided with an internal thread 403, which is used to install a valve (not shown in the figure). The valve is provided with an external thread. A first sealing groove 405 and a second sealing groove 406 are provided on the side of the internal thread 403 of the hollow cylindrical structure 401 near the hollow cavity 5, and the first sealing groove 405 and the second sealing groove 406 are separated by a predetermined distance. A retaining ring is installed in the first sealing groove 405, and a sealing ring is installed in the second sealing groove 406. The retaining ring and the sealing ring together provide a sealing effect, making it difficult for gas to leak out.
[0037] The annular pressure vessel structure of this embodiment is formed by the following method: A ring-shaped plastic inner liner 2 is printed using 3D printing technology (DLP photopolymerization 3D printing is preferred in this embodiment). Then, a sealing ring is placed into the slot 201 of the plastic inner liner 2, followed by the valve seat 4. Adhesive is applied to the connection between the valve seat 4 and the plastic inner liner 2 to ensure a tighter and more secure connection. The plastic inner liner 2 is then placed on a winding machine for carbon fiber winding. Finally, the annular pressure vessel with the carbon fiber reinforcement layer 3 is placed in a curing oven for curing, thus obtaining the annular pressure vessel structure.
[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A ring-shaped pressure vessel structure, characterized in that, The pressure vessel includes a pressure vessel body, which has an annular structure. The wall of the pressure vessel body is provided with a plastic inner liner and a carbon fiber reinforcement layer from the inside to the outside. The inside of the plastic inner liner forms a hollow cavity, and the radial cross-section of the hollow cavity is circular. A valve seat is provided on the inner wall of the pressure vessel body; the valve seat is connected to the hollow cavity through a connecting channel in the plastic inner liner. The valve seat includes a hollow cylindrical structure and a shoulder disposed on the outer wall of the hollow cylindrical structure. The shoulder is embedded in a plastic inner liner, and the wall thickness of the plastic inner liner at the valve seat is greater than the axial length of the hollow cylindrical structure.
2. The annular pressure vessel structure according to claim 1, characterized in that, The shoulder is positioned between the plastic inner liner and the carbon fiber reinforcement layer.
3. The annular pressure vessel structure according to claim 1, characterized in that, The hollow cylindrical structure is provided with internal threads, which are used to install valves.
4. The annular pressure vessel structure according to claim 3, characterized in that, The hollow cylindrical structure has a first sealing groove and a second sealing groove on the side of the internal thread near the hollow cavity, and the first sealing groove and the second sealing groove are separated by a set distance.
5. The annular pressure vessel structure according to claim 4, characterized in that, A retaining ring is installed in the first sealing groove, and a sealing ring is installed in the second sealing groove.
6. The annular pressure vessel structure according to claim 1, characterized in that, The outer contour of the shoulder is flush with the inner ring surface of the pressure vessel body.
7. The annular pressure vessel structure according to claim 1, characterized in that, The shoulder is provided with a protruding insert ring that is inserted into a slot in the plastic inner liner.
8. The annular pressure vessel structure according to claim 7, characterized in that, A sealing ring is placed in the slot of the plastic inner liner.
9. The annular pressure vessel structure according to claim 1, characterized in that, The shoulder is located near the top of the outer wall of the hollow cylindrical structure on the side away from the hollow cavity.
10. The annular pressure vessel structure according to claim 1, characterized in that, The thickness of the plastic inner liner at the valve seat is 2 to 4 times the axial length of the hollow cylindrical structure.