Locking structure for filling port of low-temperature liquid storage tank

Abstract

The utility model discloses a kind of low-temperature liquid storage tank filling mouth locking structure, belong to low-temperature liquid storage and transport equipment technical field.The structure includes the sleeve ring being set on the outside of filling connector, the cover shell being covered in the outside of filling connector and the locking mechanism being cooperated with sleeve ring.Sleeve ring is made of first sleeve ring and second sleeve ring, both lower end rotationally connected, and upper end is locked by fixed connecting block and fixed screw, sleeve ring inside is provided with sleeve groove and cooperates with the retainer ring of the outside of filling connector, realizes quick installation and stable positioning.Cover shell end is provided with upper and lower cover edge, after closing, sleeve ring interface and fastening component are shielded, improve overall protectivity.Lock block is provided with lock mouth, lock tongue, lock core and spring pin, cover shell end is provided with lock plate and clamping hook, reliable locking is realized by lock tongue and clamping hook engagement, and after unlocking, cover shell end is opened by spring pin, so that cover shell opening is more smooth.Rotary cooperation of mounting block and connecting plate makes cover shell can rotate around sleeve ring and realize opening and closing.

Description

Technical Field

[0001] This utility model belongs to the field of cryogenic liquid storage tank technology, specifically relating to a locking structure for the filling port of a cryogenic liquid storage tank. Background Technology

[0002] Cryogenic liquid storage tanks are widely used in industrial gas storage, medical gas supply, and auxiliary medium replenishment for machining. Their filling joints, as the key interface connecting the external liquid supply device and the internal space of the tank, are not only the main channel for the cryogenic medium to enter and exit the tank, but also a structural part that needs to be protected during the use of the equipment.

[0003] Existing cryogenic liquid storage tanks typically have simple mechanical protective covers or temporary wrapping fasteners on the outside of the filling connector to prevent dust ingress or accidental contact. However, in actual use, due to the compact structure of the filling connector itself, its perimeter usually relies on metal clips, threaded rings, or welded retaining rings for auxiliary fixation. Therefore, traditional locking structures generally suffer from cumbersome operation procedures, unstable positioning, and low tightening efficiency during installation. For example, in some sites, multiple screws must be tightened one by one to secure the locking components, which is not only time-consuming but also involves complex disassembly and replacement processes, making it difficult to meet the needs of frequent filling operations.

[0004] Furthermore, traditional filling port locking covers are mostly single screw-on or flip-top structures. When closed, they often fail to fully conceal internal fastening screws, connecting blocks, and other components, making them vulnerable to being pried open or having fasteners loosened by unauthorized personnel using external tools. This allows the locking structure to be intentionally removed, impacting the tank's safety management. Additionally, some locking structures suffer from insufficient latch strength and weak engagement between the latch and the hook, potentially causing the cover to loosen or open unexpectedly under transport vibrations or external impacts, thus failing to effectively lock the filling connector.

[0005] In addition, in some usage environments, the filling port is in a low temperature, humid or frosty environment for a long time. Ordinary locking mechanisms may jam, fail to reset properly or fail to open smoothly, making it inconvenient for users to operate when they need to repair, replace or open in an emergency. In some cases, the lock cylinder may freeze or the elastic element may fail to release the seal in time. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a locking structure for the filling port of a cryogenic liquid storage tank. This locking structure can effectively shield key components and has stronger protective capabilities, thereby improving the safety and management reliability of the storage tank during use.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A locking structure for the filling port of a cryogenic liquid storage tank includes a filling connector connected to the cryogenic liquid storage tank. A sleeve is fixedly fitted on the outer side of the filling connector, and a cover is provided on the outer side of the filling connector. An installation block that is rotatably connected to the cover is fixed on the right side of the sleeve, and a locking block that locks the left end of the cover is fixed on the left side of the sleeve. Both the upper and lower sides of the cover port are fixed with protruding cover edges, and when the cover is closed, the cover edges on it cover the interfaces on the upper and lower sides of the sleeve.

[0008] Furthermore, the lock block has a lock opening, and the inside of the lock opening is provided with a lock tongue to lock the cover. The lock block is also equipped with a lock cylinder to move the lock tongue, and a spring pin is fixed on the lock block to elastically push open one end of the cover.

[0009] Furthermore, a locking plate and a connecting plate are fixed to the left and right sides of the port of the cover, respectively. The connecting plate is rotatably connected to the mounting block, and the locking plate is fixed with a hook that is inserted into the lock mouth and locks with the lock tongue.

[0010] Furthermore, a retaining ring is fixed on the filling connector to be fixedly installed with the sleeve, the rear end of the filling connector is connected to the cryogenic liquid storage tank through the filling pipe, and the front end of the filling connector is provided with a filling port.

[0011] Furthermore, the sleeve includes a first sleeve ring and a second sleeve ring, the lower ends of the first sleeve ring and the second sleeve ring are rotatably connected, and the upper ends of the first sleeve ring and the second sleeve ring are both fixed with a fixing connecting block. The left and right fixing connecting blocks are fixedly connected by fixing screws. The inner sides of the first sleeve ring and the second sleeve ring are both provided with a sleeve groove that fits on the outside of the retaining ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This locking structure overcomes the problems of cumbersome installation steps and unstable positioning of traditional locking structures by setting a split sleeve on the outside of the filling connector, including the rotatable connection between the first and second sleeves, and achieving a firm lock through a fixed connecting block and screws. The sleeve design has a groove on the outside of the retaining ring, which can cooperate with the retaining ring on the filling connector for positioning, ensuring accurate and reliable installation of the sleeve, thereby improving installation efficiency and structural stability.

[0013] This locking structure features raised upper and lower edges at the housing port to shield the clamp connection and fasteners, solving the problem of exposed critical fixing areas of existing locking components being easily pried by external tools. By covering the clamp interface and fixing screw area with the edges when the housing is closed, the anti-pry capability of the locking structure and the level of on-site safety management can be effectively improved.

[0014] This locking structure features a lock mouth with a latch, a lock cylinder that moves the latch, and a spring pin that springs open the lock plate. It addresses the problem of traditional locking mechanisms getting stuck and difficult to open in low-temperature environments by controlling the latch to reliably engage with the hook through the lock cylinder and pushing the lock plate to open the end of the cover through the spring pin. This makes the opening mechanism smooth and easy to disassemble and maintain, thereby improving the overall ease of use and reliability.

[0015] This locking structure features a connecting plate and a locking plate on the left and right sides of the cover port, respectively. The connecting plate is rotatably connected to the mounting block, and the locking plate has a fixed hook that engages with the locking tongue. This solves the problems of low matching accuracy of the existing cover closure and locking mechanism and easy loosening under vibration. This structure achieves precise connection and deep engagement between the cover and the locking components, thereby ensuring that the cover can still close stably under vibration, transportation, and low-temperature frost conditions, enhancing its protective performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the locking block of this utility model; Figure 3 This is a schematic diagram of the casing of this utility model; Figure 4 This is a schematic diagram of the filling connector of this utility model; Figure 5 This is a schematic diagram of the clamp of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 1. Lock block; 11. Lock cylinder; 12. Spring pin; 13. Lock opening; 2. Sleeve; 21. First sleeve ring; 22. Sleeve groove; 23. Fixed connecting block; 24. Fixed screw; 25. Second sleeve ring; 3. Mounting block; 4. Cover; 41. Connecting plate; 42. Cover edge; 43. Lock plate; 44. Hook; 5. Filling connector; 51. Filling tube; 52. Retaining ring; 53. Filling port. Detailed Implementation

[0018] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0019] like Figure 1 and Figure 3As shown, a locking structure for the filling port of a cryogenic liquid storage tank includes a filling connector 5 connected to the cryogenic liquid storage tank. A sleeve 2 is fixedly fitted on the outer side of the filling connector 5, and a cover 4 is provided on the outer side of the filling connector 5. An mounting block 3 that is rotatably connected to the cover 4 is fixed on the right side of the sleeve 2, and a locking block 1 that locks and fixes the left end of the cover 4 is fixed on the left side of the sleeve 2. Existing methods for locking and protecting filling joints in cryogenic liquid storage tanks typically rely on external metal clamps or screw assemblies. Traditional locking structures involve numerous installation steps and unstable positioning, especially under low-temperature, frosty, or humid conditions, where insecure fastening is more likely. This increases the risk of misoperation or external prying of the filling joint, and disassembly and replacement are time-consuming. To address these issues of complex installation, poor stability, and insufficient protection, this structure incorporates a clamp 2 on the outside of the filling joint 5 and an mounting block 3 on its right side. This creates a reliable rotatable connection between the mounting block 3 and the casing 4. Simultaneously, a locking block 1 on the left side of the clamp 2 locks the left end of the casing 4, allowing the filling joint 5 to be installed, closed, and locked in a shorter time, while also improving overall pry resistance. The clamp 2 and casing 4 work together to provide full coverage protection for the filling joint 5, ensuring the locking structure maintains more reliable sealing and mechanical strength in the operating environment of cryogenic liquid storage tanks.

[0020] The upper and lower sides of the cover 4 are fixed with protruding cover edges 42, and when the cover 4 is closed, the cover edges 42 cover the interfaces on the upper and lower sides of the sleeve 2.

[0021] Traditional locking components often fail to completely conceal critical internal fasteners after locking, leaving exposed connection areas vulnerable to prying or loosening by external tools. This is especially true for the fastening screws, connecting blocks, and clamp interfaces, which are weak points susceptible to external interference, affecting the protective stability of the locking structure. In this structure, the upper and lower raised edges 42 at the port of the cover 4 cover the upper and lower interfaces of the clamp 2 after the cover 4 is closed. This ensures that the joint between the first and second collars 21 and 25, the area where the connecting block 23 is located, and the exposed portion of the fastening screw 24 are all within the internal shielding range of the cover 4, effectively preventing disassembly tools from entering and improving the overall anti-pry capability of the locking structure. Furthermore, it prevents frost from adhering to the interface areas and affecting disassembly in low-temperature environments.

[0022] like Figure 2 As shown, the lock block 1 has a lock opening 13, and a lock tongue is provided on the inner side of the lock opening 13 to lock the cover 4. The lock block 1 is also equipped with a lock cylinder 11 to move the lock tongue, and a spring pin 12 is fixed on the lock block 1 to elastically push open one end of the cover 4.

[0023] Existing locking mechanisms are prone to problems such as bolt jamming, lock cylinder freezing, and insensitive opening in low-temperature environments, leading to operational difficulties when refilling or maintenance is required, and even the inability to release the lock in time in emergencies. To improve the above-mentioned problems of insufficient locking reliability, this structure has a lock opening 13 on the lock block 1 and a lock bolt inside the lock opening 13, so that the lock bolt can reliably engage with the hook 44 on the cover 4 for locking. At the same time, a lock cylinder 11 is provided on the lock block 1 to actuate the lock bolt, so that the lock bolt can be smoothly opened under the action of the lock cylinder 11. In addition, the spring pin 12 fixed on the lock block 1 can push the lock plate 43 outward and push the end of the cover 4 after the lock bolt is unlocked, so that the cover 4 can be opened smoothly for the disassembly, replacement, or maintenance of the sleeve 2, ensuring stable opening performance under low-temperature conditions.

[0024] like Figure 3 As shown, a locking plate 43 and a connecting plate 41 are fixed on the left and right sides of the port of the cover 4, respectively. The connecting plate 41 is rotatably connected to the mounting block 3. A hook is fixed on the locking plate 43, which is inserted into the lock opening 13 and locks with the lock tongue.

[0025] Traditional filling port protective covers generally suffer from low buckle matching accuracy, insufficient engagement depth, or loosening under external vibration when closing and locking, leading to accidental opening of the cover during transportation or use, thereby reducing the sealing and safety of the filling connector. To solve these problems, this structure is equipped with a locking plate 43 and a connecting plate 41 at the port of the cover 4, so that the connecting plate 41 can smoothly open and close the cover 4 through rotational cooperation with the mounting block 3. The hook 44 fixed on the locking plate 43 can be inserted into the lock opening 13 after the cover 4 is closed and firmly engaged with the lock tongue, so that the locking device forms a deep engagement, improving the vibration resistance of the cover locking. At the same time, the structure of the hook 44 allows the locking mechanism to maintain a stable engagement effect in low temperature and frost environment, ensuring that the cover 4 is not easily pried open by external force in various usage scenarios.

[0026] like Figure 4 As shown, a retaining ring 52 is fixed on the filling connector 5 to be fixedly installed with the sleeve 2. The rear end of the filling connector 5 is connected to the cryogenic liquid storage tank through the filling pipe 51, and the front end of the filling connector 5 is provided with a filling port 53.

[0027] Some cryogenic liquid storage tanks lack effective positioning references on the outer side of their filling joints, making it easy for clamp-type locking structures to rotate or shift during installation. This results in inaccurate alignment between the locking structure and the casing, affecting the locking effect. To solve the problem of inaccurate positioning, this structure fixes a retaining ring 52 on the filling joint 5, allowing the retaining ring 52 to form a stable circumferential fit with the groove 22 on the sleeve 2, further improving the installation accuracy of the sleeve 2. The rear end of the filling joint 5 is connected to the cryogenic liquid storage tank through a filling pipe 51, enabling the filling joint 5 to withstand temperature and pressure changes of the liquid medium during operation. The filling port 53 at the front end of the filling joint 5 serves as a key connection port between the external gas source and the internal storage tank, requiring reliable locking protection. The fit between the retaining ring 52 and the sleeve 2 provides a reliable basic fixing interface for the locking structure.

[0028] like Figure 5 As shown, the sleeve 2 includes a first sleeve 21 and a second sleeve 25. The lower ends of the first sleeve 21 and the second sleeve 25 are rotatably connected, and the upper ends of the first sleeve 21 and the second sleeve 25 are both fixed with a fixing connecting block 23. The left and right fixing connecting blocks 23 are fixedly connected by fixing screws 24. The inner sides of the first sleeve 21 and the second sleeve 25 are both provided with a sleeve groove 22 that fits on the outside of the retaining ring 52.

[0029] Existing locking clamps mostly adopt an integral structure, which requires insertion from the end of the filling connector during installation. This makes installation difficult when encountering existing pipelines or limited space. Furthermore, the integral clamp restricts the operating space during disassembly, affecting the efficiency of assembly and disassembly. To solve the above inconveniences, this structure adopts a split clamp 2 formed by the combination of a first collar 21 and a second collar 25. The lower ends of the first collar 21 and the second collar 25 are hinged to achieve opening and closing operations, allowing the clamp structure to be directly assembled from the outside of the filling connector 5. A fixed connecting block 23 is set at the upper end of the two collars, and the fixed connecting block 23 is fixedly connected by a fixing screw 24, so that the clamp 2 forms a stable circumferential clamping force after locking. The inner side of the first collar 21 and the second collar 25 is provided with a groove 22, which can be accurately fitted onto the outside of the retaining ring 52, ensuring that the clamp 2 does not slip or rotate after installation, effectively ensuring that the positions of each component are accurately aligned when the cover 4 is closed, and enhancing the overall anti-pry capability.

[0030] The working principle of this utility model is as follows: When locking the filling joint 5 of the cryogenic liquid storage tank, the first sleeve ring 21 and the second sleeve ring 25 are fitted onto the retaining ring 52 using the sleeve groove 22, and then the two fixed connecting blocks 23 are fixedly connected and locked using the fixing screw 24, thereby completing the quick installation and fixing of the sleeve 2 on the filling joint 5, making the installation of the locking structure of the filling joint 5 more convenient and quick, and also convenient for subsequent disassembly and replacement. After the locking structure of the filling connector 5 is installed, the cover 4 is rotated to cover the filling connector 5 and the filling port 53, and the hook 44 is inserted into the lock mouth 13 and locked with the lock tongue, thereby completing the closure and locking of the cover 4. At this time, the cover edge 42 on the upper side of the cover 4 covers the fixing screw 24 and the two fixing connecting blocks 23, while the cover edge 42 on the lower side of the cover 4 covers the junction of the first ring 21 and the second ring 25, thereby effectively preventing unauthorized personnel from disassembling the locking structure with tools, and providing good protection. When it is necessary to open the cover 4, the key is inserted into the lock cylinder 11 to move the lock tongue out of the latch 44. At this time, the spring pin 12 pushes the lock plate 43 open, thereby completing the opening of the cover 4. After the cover 4 is opened, it is also convenient to disassemble, replace or repair the locking structure.

[0031] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A locking structure for the filling port of a cryogenic liquid storage tank, comprising a filling connector (5) connected to the cryogenic liquid storage tank, characterized in that: The outer side of the filling connector (5) is fixedly fitted with a sleeve (2), and the outer side of the filling connector (5) is covered with a cover (4). The right side of the sleeve (2) is fixed with an installation block (3) that is rotatably connected to the cover (4), and the left side of the sleeve (2) is fixed with a locking block (1) that locks the left end of the cover (4). The upper and lower sides of the port of the cover (4) are fixed with protruding cover edges (42), and when the cover (4) is closed, the cover edges (42) on it cover the interface on the upper and lower sides of the sleeve (2).

2. The locking structure for the filling port of a cryogenic liquid storage tank according to claim 1, characterized in that: The lock block (1) has a lock opening (13), and the inner side of the lock opening (13) is provided with a lock tongue to lock the cover (4). The lock block (1) is also equipped with a lock cylinder (11) to move the lock tongue, and a spring pin (12) is fixed on the lock block (1) to elastically push open one end of the cover (4).

3. The locking structure for the filling port of a cryogenic liquid storage tank according to claim 2, characterized in that: A locking plate (43) and a connecting plate (41) are fixed on the left and right sides of the port of the cover (4), respectively. The connecting plate (41) is rotatably connected to the mounting block (3). A hook is fixed on the locking plate (43) and inserted into the lock opening (13) to lock the lock tongue.

4. The locking structure for the filling port of a cryogenic liquid storage tank according to claim 3, characterized in that: The filling connector (5) is fixed with a retaining ring (52) that is fixedly installed with the sleeve (2). The rear end of the filling connector (5) is connected to the cryogenic liquid storage tank through the filling pipe (51), and the front end of the filling connector (5) is provided with a filling port (53).

5. The locking structure for the filling port of a cryogenic liquid storage tank according to claim 4, characterized in that: The sleeve (2) includes a first sleeve (21) and a second sleeve (25). The lower ends of the first sleeve (21) and the second sleeve (25) are rotatably connected, and the upper ends of the first sleeve (21) and the second sleeve (25) are both fixed with a fixing connecting block (23). The two fixing connecting blocks (23) on the left and right are fixedly connected by fixing screws (24). The inner sides of the first sleeve (21) and the second sleeve (25) are both provided with a sleeve groove (22) that fits on the outside of the retaining ring (52).

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