A four-way joint mold for a full-composite liquid hydrogen storage tank

Abstract

The utility model discloses a four -way joint mould for full composite liquid hydrogen storage tank in the composite material forming technical field, including the connecting body, be provided with first connecting piece and second connecting piece on the connecting body, first connecting piece and connecting body are vertically arranged, second connecting piece and connecting body coaxial arrangement, one end of connecting body corresponds with liquid hydrogen storage tank arrangement, the other end of connecting body is provided with the connecting section, is used for installing and positioning first connecting piece and second connecting piece, the number of first connecting piece is two, and is symmetrically arranged. The utility model discloses the four -way joint mould is decomposed into a plurality of independent module, not only reduces the machining difficulty of single part and the strict demand to precision, makes the precision polishing and polishing of internal complex cavity possible more, ensures the high quality of mould surface to greatly prolong the service life of mould, effectively reduces manufacturing cost and production cycle.

Description

Technical Field

[0001] This utility model relates to the field of composite material molding technology, and in particular to a four-way connector mold for a fully composite liquid hydrogen storage tank. Background Technology

[0002] The endurance of long-endurance drones depends on fuel consumption rate and fuel capacity. Traditional hydrocarbon fuels such as aviation kerosene have low calorific value, which limits the aircraft's endurance.

[0003] Liquid hydrogen, with the highest energy density among general hydrogen energy storage options, is currently the preferred storage medium for hydrogen fuel cell aircraft and hydrogen-powered turbine aircraft under development. However, liquid hydrogen is a flammable and explosive fuel; therefore, the design and installation of storage tanks must ensure their safety and reliability under various aircraft operating conditions.

[0004] Currently, the inner walls of mainstream liquid hydrogen storage tanks are usually made of Al-2219 aluminum alloy, which has good low-temperature performance. However, in order to further reduce the negative weight of drones, and thanks to the low thermal conductivity and small coefficient of thermal expansion of fiber-reinforced composite materials, all-composite liquid hydrogen storage tanks are the future development trend.

[0005] During the development of all-composite liquid hydrogen storage tanks, heat leakage rate testing is required. This testing necessitates connecting equipment such as pressure relief valves and pressure gauges. However, fiber-reinforced composite materials cannot be welded like metal materials; any opening would significantly impact structural strength. Therefore, a composite four-way connector at the tank opening effectively solves this problem. Compared to metal four-way connectors, composite four-way connectors not only have a similar coefficient of thermal expansion to the liquid hydrogen storage tank body, thus preventing cracking at the connection point, but also avoid the rapid heat conduction caused by the high thermal conductivity of metal four-way connectors.

[0006] However, there is currently no production mold specifically for the four-way connector of a fully composite liquid hydrogen storage tank. Therefore, we propose a mold for the four-way connector of a fully composite liquid hydrogen storage tank. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a four-way connector mold for all-composite liquid hydrogen storage tanks. The mold achieves integrated molding of complex four-way connectors through modular design and precise mechanical positioning guidance, which significantly reduces manufacturing costs and improves production and maintenance efficiency while ensuring high product quality and structural stability.

[0008] The purpose of this utility model is achieved as follows: A four-way connector mold for a fully composite liquid hydrogen storage tank includes a connecting body, on which a first connecting member and a second connecting member are provided. The first connecting member is perpendicular to the connecting body, and the second connecting member is coaxial with the connecting body. One end of the connecting body is correspondingly positioned to the liquid hydrogen storage tank, and the other end of the connecting body is provided with a connecting section for installing and positioning the first connecting member and the second connecting member. There are two first connecting members, and the two first connecting members are symmetrically arranged.

[0009] Optionally, the connector includes an inner diameter section, one end of which is a connecting section, and the other end of which is a mating section.

[0010] Optionally, the connecting segment has first connecting holes on both sides, and the two first connecting holes are connected by a first threaded hole. The first connecting holes are frustum-shaped, and the two first connecting holes and the first threaded hole are coaxial.

[0011] Optionally, the first connector has a first mounting hole, which is a bolt hole. A bolt is inserted into the first mounting hole, and the bolt passes through the first connector and is threaded into the first connecting hole.

[0012] Optionally, the end face of the connecting segment is provided with a second connecting hole, the second connecting hole is truncated into a frustum shape, and a second threaded hole is provided inside the second connecting hole, the second connecting hole being provided in correspondence with the second connecting member.

[0013] Optionally, the second connector is provided with a boss, which is correspondingly provided with a second connecting hole and is inserted into the second connecting hole. The second connector is provided with a second mounting hole, and the second connector and the second connecting hole are fixedly connected by bolts.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This application adopts a modular mold design, decomposing the complex four-way connector mold into independent modules such as the connector body, the first connector, and the second connector. This not only reduces the processing difficulty of individual parts and the stringent requirements for precision, but also makes it possible to perform precision grinding and polishing on the complex internal cavities, ensuring high quality of the mold surface. When a module is worn or damaged, it can be directly disassembled and replaced without scrapping the entire expensive and complex mold, thereby greatly extending the service life of the mold and effectively reducing manufacturing costs and production cycle.

[0015] 2. The first and second connectors and the connector body adopt a dual mating mechanism of conical guide and bolt locking. Whether it is the conical boss mating with the conical hole of the connector body or the bolt connection, it provides reliable positioning and guidance for subsequent installation, which greatly ensures the coaxiality and installation accuracy of the assembly. It can not only effectively avoid the risk of mold misalignment, mold flying and product flash caused by eccentric load, but also maintain extremely high structural stability under harsh working conditions of high temperature and high pressure through strong radial locking and axial pre-tightening force, thereby ensuring the consistency of the final four-way connector product dimensions and excellent structural integrity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0018] Figure 2 This is an exploded view of the overall structure provided by this utility model.

[0019] Figure 3 This is a cross-sectional schematic diagram of the connector structure provided by this utility model.

[0020] Figure 4 This is a cross-sectional schematic diagram of the first connector provided by this utility model.

[0021] Figure 5 This is a cross-sectional schematic diagram of the second connector provided by this utility model.

[0022] In the figure: 1. Connector; 11. Connecting section; 12. Inner diameter section; 13. Mating section; 14. First connecting hole; 15. First threaded hole; 16. Second connecting hole; 17. Second threaded hole; 2. First connector; 21. First mounting hole; 3. Second connector; 31. Boss; 32. Second mounting hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 5 The four-way connector mold shown is for a fully composite liquid hydrogen storage tank. It includes a connecting body 1, on which a first connecting member 2 and a second connecting member 3 are provided. The first connecting member 2 is perpendicular to the connecting body 1, and the second connecting member 3 is coaxial with the connecting body 1. One end of the connecting body 1 is corresponding to the liquid hydrogen storage tank, and the other end of the connecting body 1 is provided with a connecting section 11 for installing and positioning the first connecting member 2 and the second connecting member 3. There are two first connecting members 2, which are symmetrically arranged.

[0025] Furthermore, this application solves the problem that the inability to weld composite materials and the impact of openings on structural strength by setting up a connector 1 and modular first connector 2 and second connector 3, thus achieving one-time molding of the four-way connector. This structure not only has a high degree of matching with the thermal expansion coefficient of the storage tank, eliminating the risk of low-temperature cracking caused by thermal stress, but also effectively blocks external heat conduction by virtue of the inherent low thermal conductivity of composite materials, significantly reducing liquid hydrogen evaporation loss, and achieving excellent lightweight benefits while ensuring structural integrity.

[0026] Specifically, the connector 1 includes an inner diameter section 12, one end of which is a connecting section 11, and the other end of which is a mating section 13. The connecting section 11 has first connecting holes 14 on both sides, and the two first connecting holes 14 are connected by a first threaded hole 15. The first connecting holes 14 are frustum-shaped, and the two first connecting holes 14 and the first threaded hole 15 are coaxial.

[0027] Furthermore, in the multi-segment structure of the inner diameter section 12, the mating section 13, and the connecting section 11 on the connecting body 1, the inner diameter section 12 is consistent with the inner diameter of the tank opening, the mating section 13 is used to insert and mate with the tank opening, and the connecting section 11 is used to connect the first connecting piece 2 and the second connecting piece 3. The first connecting hole 14 of the frustum on the connecting body 1 provides reliable positioning and guidance for the subsequent installation of the vertical connecting piece, ensuring installation accuracy and coaxiality, and effectively avoiding eccentric loads.

[0028] Specifically, the first connector 2 has a first mounting hole 21, which is a bolt hole. A bolt is inserted into the first mounting hole 21, and the bolt passes through the first connector 2 and is threadedly connected to the first connecting hole 14.

[0029] Furthermore, the bolts directly connect the first connector 2 and the connector 1 to form a stable mechanical locking structure, which allows the complex four-way mold to be decomposed into multiple independent modules, making it easy to demold, manufacture and process separately. This not only greatly reduces the processing difficulty and precision requirements of individual parts, but also facilitates the precision grinding and polishing of complex internal cavities, ensuring the high quality of the mold surface. At the same time, this detachable structure greatly simplifies the assembly and maintenance of the mold. When a module is worn or damaged, it can be directly disassembled and replaced without scrapping the entire expensive mold, effectively extending the service life of the mold and reducing manufacturing costs and cycle time.

[0030] Specifically, the end face of the connecting section 11 is provided with a second connecting hole 16, which is truncated cone-shaped. A second threaded hole 17 is provided inside the second connecting hole 16. The second connecting hole 16 is correspondingly provided with the second connecting member 3. A boss 31 is provided on the second connecting member 3, which is correspondingly provided with the second connecting hole 16. The boss 31 is inserted into the second connecting hole 16. A second mounting hole 32 is provided on the second connecting member 3. The second connecting member 3 and the second connecting hole 16 are fixedly connected by bolts.

[0031] Furthermore, the second connecting hole 16 adopts a frustum-shaped conical surface structure, which forms a precise positioning and guiding fit with the boss 31 on the second connecting part 3. During assembly, the conical surface guide ensures that the boss 31 can be quickly and accurately aligned, which not only greatly improves assembly efficiency, but more importantly, this surface contact method transmits huge radial force for locking. The positioning rigidity and coaxiality far exceed those of ordinary cylindrical fit, effectively preventing the risk of mold flying and the problem of flash on the parts caused by misalignment under high pressure of mold closing. Subsequent bolt connections apply axial preload to firmly lock the two parts together, forming a robust whole. This not only ensures precise mold closure but also guarantees high structural stability and reliability of the components under high temperature and pressure molding conditions, thus ensuring the consistency and high quality of the final product dimensions.

[0032] Working principle: This application adopts a modular mold design, decomposing the complex four-way connector mold into independent modules such as connector 1, first connector 2, and second connector 3. This not only reduces the processing difficulty of individual parts and the stringent requirements for precision, but also makes it possible to precisely grind and polish the complex internal cavities, ensuring high quality of the mold surface. When a module is worn or damaged, it can be directly disassembled and replaced without scrapping the entire expensive and complex mold, thereby greatly extending the service life of the mold and effectively reducing manufacturing costs and production cycle.

[0033] Secondly, the first connector 2, the second connector 3, and the connector 1 adopt a dual-fitting mechanism of conical guide and bolt locking. Whether the conical boss 31 fits with the conical hole of the connector 1 or is bolted, it provides reliable positioning and guidance for subsequent installation, greatly ensuring the coaxiality and installation accuracy of the assembly. This not only effectively avoids the risk of mold misalignment, mold flying, and product flash caused by eccentric loads, but also maintains extremely high structural stability under harsh working conditions of high temperature and high pressure through strong radial locking and axial pre-tightening force, thereby ensuring the consistency of the final four-way connector product dimensions and excellent structural integrity.

[0034] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A four-way connector mold for a fully composite liquid hydrogen storage tank, comprising a connector (1), characterized in that: The connector (1) is provided with a first connector (2) and a second connector (3). The first connector (2) is perpendicular to the connector (1), and the second connector (3) is coaxial with the connector (1). One end of the connector (1) is correspondingly provided with the liquid hydrogen storage tank. The other end of the connector (1) is provided with a connecting section (11) for installing and positioning the first connector (2) and the second connector (3). There are two first connectors (2), and the two first connectors (2) are symmetrically arranged.

2. The four-way connector mold for a fully composite liquid hydrogen storage tank according to claim 1, characterized in that: The connector (1) includes an inner diameter section (12), one end of which is a connecting section (11), and the other end of which is a mating section (13).

3. A four-way connector mold for a fully composite liquid hydrogen storage tank according to claim 2, characterized in that: The connecting section (11) has first connecting holes (14) on both sides. The two first connecting holes (14) are connected by a first threaded hole (15). The first connecting holes (14) are frustum-shaped and the two first connecting holes (14) and the first threaded hole (15) are coaxial.

4. A four-way connector mold for a fully composite liquid hydrogen storage tank according to claim 3, characterized in that: The first connector (2) has a first mounting hole (21), which is a bolt hole. A bolt is inserted into the first mounting hole (21), and the bolt passes through the first connector (2) and is threadedly connected to the first connecting hole (14).

5. A four-way connector mold for a fully composite liquid hydrogen storage tank according to claim 2, characterized in that: The end face of the connecting segment (11) is provided with a second connecting hole (16), which is frustum shaped. A second threaded hole (17) is provided inside the second connecting hole (16), and the second connecting hole (16) is correspondingly provided with the second connecting member (3).

6. A four-way connector mold for a fully composite liquid hydrogen storage tank according to claim 5, characterized in that: The second connector (3) is provided with a boss (31), the boss (31) is correspondingly provided with the second connecting hole (16), the boss (31) is inserted into the second connecting hole (16), the second connector (3) is provided with a second mounting hole (32), and the second connector (3) and the second connecting hole (16) are fixedly connected by bolts.

Images