Hydrogen filling port for vehicle-mounted hydrogen storage tank

Abstract

The application discloses a hydrogen filling port for a vehicle-mounted hydrogen storage tank and relates to the technical field of vehicle-mounted hydrogen storage tank components of new energy vehicles.The hydrogen filling port comprises a hydrogen filling port connecting bolt used for being connected with the vehicle-mounted hydrogen storage tank, and a valve sleeve used for being connected with a hydrogen filling gun pipe is detachably installed on the hydrogen filling port connecting bolt in a threaded manner.The application realizes normal sealing through an early interception of impurities by an air inlet filtering assembly and a normally closed one-way plugging assembly, and is matched with a mechanical interlocking structure composed of a transmission, linkage, pushing and blocking assembly, so that the complete reset stroke of a conical valve head is used as a prerequisite for gun pulling unlocking, the hydrogen filling gun pipe is locked when the valve core is not completely sealed due to ice blockage and impurity jamming, hydrogen leakage risks caused by gun pulling under pressure are eliminated from the structure, the convenience of conventional hydrogen filling operation and intrinsic safety under high and low temperature complex working conditions are considered, and valve core wear and jamming faults are reduced, thereby prolonging the service life of the hydrogen filling port.

Description

Technical Field

[0001] This invention relates to the technical field of on-board hydrogen storage tank components for new energy vehicles, specifically a hydrogen refueling port for an on-board hydrogen storage tank. Background Technology

[0002] Hydrogen fuel cell vehicles, as an important development direction of new energy vehicles, have advantages such as zero emissions, long driving range, and fast refueling speed. They have been widely used in transportation fields such as commercial vehicles and passenger vehicles. The on-board high-pressure hydrogen storage tank is the core energy storage component of hydrogen fuel cell vehicles. The hydrogen refueling port, as the only docking assembly structure between the on-board hydrogen storage system and the hydrogen refueling gun at the hydrogen refueling station, undertakes the core functions of high-pressure hydrogen refueling and one-way sealing after refueling. Its sealing reliability and operational stability directly determine the safety of hydrogen use in the whole vehicle.

[0003] Currently, the existing vehicle hydrogen refueling port uses a spring-driven conical one-way valve sealing structure, which relies on the spring force to reset and seal the valve core, meeting the conventional hydrogen refueling sealing requirements. However, in actual vehicle operation and hydrogen refueling operations, the existing hydrogen refueling port structure has many inherent defects and is difficult to adapt to the complex working conditions of high pressure, low temperature and frequent plugging and unplugging. First, the existing hydrogen refueling port lacks a valve core reset state linkage protection structure. During hydrogen refueling operations, there are non-standard operating conditions such as operators quickly pulling out the nozzle or pulling out the nozzle under pressure. At the moment of pulling out the nozzle, there is residual high-pressure hydrogen inside the hydrogen refueling port. The high-pressure airflow will generate a reverse pushing force on the one-way valve cone head. Combined with the mechanical reset inertia of the valve core, it is very easy to cause the cone head to reset lag and not close properly, resulting in an abnormal state of half-open valve core. At this time, the high-pressure hydrogen inside the hydrogen storage tank will continue to leak out through the valve core sealing gap, causing hydrogen leakage risk and greatly reducing the safety of hydrogen refueling operations. Secondly, during high-pressure hydrogen refueling, the hydrogen output from the hydrogen refueling station needs to undergo low-temperature pre-cooling treatment. The pre-cooled hydrogen will carry trace amounts of water vapor. When the water vapor enters the narrow throttling channel inside the hydrogen refueling port along with the high-pressure hydrogen, it will quickly condense and freeze due to the throttling and cooling. The ice layer is very likely to stick to the conical valve head, further aggravating the problem that the valve core cannot be completely reset and closed. To address this, we propose a hydrogen refueling port for vehicle-mounted hydrogen storage tanks. Summary of the Invention

[0004] The purpose of this invention is to provide a hydrogen refueling port for an on-board hydrogen storage tank to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydrogen refueling port for a vehicle-mounted hydrogen storage tank, comprising a hydrogen refueling port connecting bolt for installation and connection with the vehicle-mounted hydrogen storage tank, a valve sleeve for connection to a hydrogen refueling nozzle is detachably installed on the hydrogen refueling port connecting bolt by means of threads, a protective cover is snapped onto the front side of the valve sleeve, the hydrogen refueling nozzle includes a delivery pipe, a positioning pipe is fixed to one end of the delivery pipe, a locking sleeve is sleeved on the outer side of the positioning pipe, and a locking component is provided on the locking sleeve for locking and fixing with the valve sleeve, and further comprising: A one-way sealing assembly is disposed between the valve sleeve and the hydrogen filling port connecting bolt, and is used for one-way sealing after hydrogenation. The one-way sealing assembly is provided with a conical valve head and an elastic component for assisting in squeezing and pushing the conical valve head. The intake filter assembly, located inside the valve sleeve, is used for filtration during the hydrogen delivery process. Additionally, a blocking component is provided between the air intake filter assembly and the positioning tube to block the positioning tube. A pushing component is provided between the filter assembly and the blocking component to assist in pushing the blocking component. A transmission component is provided between the air intake filter assembly and the conical valve head for transmission. Under the interaction of the transmission component, the pushing component and the blocking component, the conical valve head is kept in a limiting position to block the positioning tube when it fails to reset properly, thus preventing hydrogen leakage.

[0006] Preferably, the one-way sealing assembly includes a tapered opening at the end of the valve sleeve facing the hydrogen filling port connecting bolt. The tapered valve head is matched with the tapered opening. The hydrogen filling port connecting bolt has a communicating installation cavity. After the valve sleeve and the hydrogen filling port connecting bolt are installed, the tapered opening and the installation cavity allow communication between the hydrogen filling port connecting bolt and the valve sleeve. The installation cavity has an installation plate inside, and the tapered valve head is fixed on the installation plate.

[0007] Preferably, the elastic component includes multiple sets of sleeves fixed inside the mounting cavity, and the multiple sets of sleeves are evenly distributed inside the mounting cavity. A sliding rod is slidably connected to each sleeve, one end of the sliding rod is fixed to the mounting plate, and a first spring is sleeved on the outside of the sleeve. The two ends of the first spring abut against the inner wall of the mounting cavity and the mounting plate, respectively. After the valve sleeve is installed with the hydrogen inlet connecting bolt, the elastic force of the first spring on the mounting plate and the conical valve head causes the conical valve head to abut against the conical opening, thus sealing the connection between the valve sleeve and the hydrogen inlet connecting bolt.

[0008] Preferably, the air intake filter assembly includes a filter cylinder, one end of which is integrally formed with an installation sleeve. The installation sleeve is detachably installed to the inside of the valve sleeve via threads. After installation, the inside of the filter cylinder communicates with a conical opening. Multiple filter grooves are provided on the filter cylinder for filtering the gas entering the valve sleeve.

[0009] Preferably, the blocking assembly includes an annular groove formed inside the positioning tube, and one side of the filter cylinder is connected to multiple sets of blocking plates for engaging with the annular groove via a telescopic assembly along the radial direction of the filter cylinder, and the sets of blocking plates are arranged in a circular array.

[0010] Preferably, the telescopic assembly includes a mounting bracket fixed to one end of the filter cylinder, a plurality of mounting cylinders are fixed on the mounting bracket, and a telescopic rod is slidably connected to the mounting cylinder, with one end of the telescopic rod fixed to the baffle plate.

[0011] Preferably, the pushing assembly includes a pushing ring disposed between the filter cartridge and the baffle plate, and the pushing ring and the filter cartridge are concentrically arranged. A transmission plate is fixed on the baffle plate, and an inclined groove is formed on the transmission plate. A transmission pin is slidably connected to the inclined groove, and the transmission pin and the pushing ring are connected and fixed by a fixing bracket.

[0012] Preferably, the transmission assembly includes a transmission disc disposed inside the filter cylinder, a transmission rod fixed on the transmission disc for abutting and driving against the end of the conical valve head, and a linkage assembly for auxiliary linkage is disposed between the transmission disc and the push ring.

[0013] Preferably, the linkage assembly includes a connecting rod slidably connected to the filter cylinder. The connecting rods are arranged in a circular array on the filter cylinder. The two ends of the connecting rod are fixed to the transmission disc and the push ring, respectively. A second spring is sleeved on the outside of the connecting rod. The two ends of the second spring abut against the outside of the filter cylinder and the push ring, respectively. When the conical valve head is fully reset, the conical valve head abuts against one end of the transmission rod. In conjunction with the linkage assembly, the push assembly, and the telescopic assembly, the blocking plates slide out of the annular groove. When the conical valve head is not fully reset, the blocking plates do not slide out of the annular groove completely through transmission, thus blocking the positioning tube and preventing the hydrogenation gun tube from separating.

[0014] Preferably, the inner side of the valve sleeve is provided with a positioning groove for positioning the positioning tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention innovatively sets up a mechanical linkage self-locking mechanism composed of a transmission component, a linkage component, a pushing component, and a blocking component. The unlocking and unlocking authority of the hydrogen refueling nozzle is completely controlled by the actual reset and sealing state of the conical valve head. When the conical valve head is stuck or iced, resulting in incomplete reset or inadequate sealing, the blocking plate remains in a locked state to forcibly lock the hydrogen refueling nozzle, preventing the equipment from being pulled out. This structurally eliminates the problem of high-pressure hydrogen leakage caused by human error or valve core failure, greatly improving the inherent safety of hydrogen refueling operations. 2. This invention integrates an inlet filter component inside the valve sleeve, which can effectively intercept solid impurities such as metal debris and dust in the hydrogen medium before hydrogen enters the one-way sealing structure, preventing impurities from accumulating between the conical valve head and the conical orifice sealing pair. This reduces valve core jamming, sealing surface scratches, and incomplete closure from the source, improves the sealing stability and service life of the one-way sealing component, and is suitable for long-term high-frequency and high-pressure hydrogenation conditions. 3. Addressing the industry pain point of easy icing and blockage of valve cores in existing low-temperature precooling hydrogenation, this invention utilizes mechanical linkage self-locking logic to continuously lock the gun pulling action when the valve core is stuck due to icing or insufficient reset stroke, forcing the equipment to remain in the docking state, reminding staff to check and de-ice, and avoiding half-open leakage of the valve core caused by ice blockage. This effectively solves the problems of unreliable sealing and prominent safety hazards in low-temperature hydrogenation scenarios, and has stronger adaptability to working conditions. 4. The present invention is equipped with multiple sets of evenly arranged elastic components. The first spring continuously pushes the conical valve head to fit the conical opening, so that the hydrogen filling port always maintains a reliable normally closed seal when no hydrogen is added. This can effectively prevent external moisture and dust from entering the valve body cavity and hydrogen storage pipeline, avoid internal corrosion, dirt accumulation and jamming, greatly reduce the failure rate and improve the long-term static stability of the vehicle hydrogen storage system. 5. This invention achieves precise coaxial insertion of the hydrogen refueling nozzle through the positioning groove on the inner side of the valve sleeve, and the locking structure ensures a firm and secure connection for high-pressure hydrogen refueling without loosening. At the same time, the overall mechanical linkage structure is purely mechanically driven and requires no electrical control. The entire process of hydrogen refueling, nozzle locking, and reset unlocking is a closed-loop logic. Under normal working conditions, it does not affect the conventional insertion and removal operation process. It provides automatic self-locking protection in case of failure. The structure is simple and reliable, adaptable to complex vibration conditions on the vehicle, and combines practicality and safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram showing the state after the hydrogen filling port and the hydrogen filling gun tube of the present invention are connected; Figure 3 This is a schematic diagram showing the state of the hydrogenation port connecting bolt and valve sleeve after installation according to the present invention; Figure 4 This is a schematic diagram of the internal structure of the hydrogenation port connecting bolt and valve sleeve after installation according to the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the one-way sealing component, the elastic component, and the air intake filter component of the present invention; Figure 6 This is a schematic diagram of the air intake filter assembly, the blocking assembly, the transmission assembly, and the linkage assembly of the present invention. Figure 7 This is a schematic diagram of the telescopic component and the pushing component of the present invention; Figure 8This is a schematic diagram of the internal structure of the hydrogenation gun barrel of the present invention; Figure 9 This is a schematic diagram of the blocking component state when the conical valve head of the present invention is reset normally; Figure 10 This is a schematic diagram of the blocking component state when the conical valve head of the present invention is not fully reset.

[0017] In the diagram: 101, hydrogenation port connecting bolt; 102, valve sleeve; 103, protective cover; 201, delivery pipe; 202, positioning pipe; 203, locking sleeve; 301, conical opening; 302, mounting cavity; 303, mounting plate; 304, conical valve head; 401, sleeve; 402, slide rod; 403, first spring; 501, filter cartridge; 502, mounting sleeve; 503, filter groove; 601, annular groove; 602, baffle plate; 701, mounting bracket; 702, mounting cylinder; 703, telescopic rod; 801, push ring; 802, transmission plate; 803, inclined groove; 804, transmission pin; 805, fixed bracket; 901, transmission disc; 902, transmission rod; 1001, connecting rod; 1002, second spring; 11, positioning groove. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1

[0020] Please see Figures 1-10 The figure shows a hydrogen refueling port for a vehicle-mounted hydrogen storage tank, including a hydrogen refueling port connecting bolt 101 for installation and connection with the vehicle-mounted hydrogen storage tank. A valve sleeve 102 for connection with the hydrogen refueling gun tube is detachably installed on the hydrogen refueling port connecting bolt 101 by means of threads. A protective cover 103 is snapped on the front side of the valve sleeve 102. The hydrogen refueling gun tube includes a delivery pipe 201. A positioning pipe 202 is fixed at one end of the delivery pipe 201. A locking sleeve 203 is sleeved on the outside of the positioning pipe 202. A locking component is provided on the locking sleeve 203 for locking and fixing with the valve sleeve 102. It should be noted here that: before using the hydrogen refueling port of the vehicle-mounted hydrogen storage tank, the valve sleeve 102 is installed on the hydrogen refueling port connecting bolt 101 by means of threads. During the installation process, the sealing between the valve sleeve 102 and the hydrogen refueling port connecting bolt 101 and the hydrogen refueling port connecting bolt 101 and the vehicle-mounted hydrogen storage tank after installation is a conventional technical means. Its structural composition and working principle are well-known technologies and will not be described in detail here. During the use of the hydrogenation gun barrel, the internal hydrogen delivery and subsequent pressure reduction are conventional technical means in this application, and their working principle and control method will not be described in detail here. By cooperating with the locking sleeve 203, the mechanical locking and fixing between the hydrogenation gun tube and the valve sleeve 102 is achieved, completing the sealing and docking assembly before hydrogenation, ensuring that the docking position is not loose or leaking during high-pressure hydrogenation. In addition, the driving and structural composition of the locking component are conventional technical means in this application, and its working principle and steps are known technologies, so they will not be described in detail here.

[0021] Also includes: A one-way sealing assembly is disposed between the valve sleeve 102 and the hydrogen filling port connecting bolt 101 for one-way sealing after hydrogenation. The one-way sealing assembly is provided with a conical valve head 304 and an elastic component for assisting in squeezing and pushing the conical valve head 304. An intake filter assembly, located inside the valve sleeve 102, is used for filtration during the hydrogen delivery process. In addition, a blocking component is provided between the air intake filter assembly and the positioning tube 202 to block the positioning tube 202. A pushing component is provided between the filter assembly and the blocking component to assist in pushing the blocking component. A transmission component is provided between the air intake filter assembly and the conical valve head 304 for transmission. Under the interaction of the transmission component, the pushing component and the blocking component, the conical valve head 304 maintains the limiting and blocking of the positioning tube 202 when it fails to reset properly, so as to prevent hydrogen leakage. It should be noted that the intake filter component intercepts impurities in advance, and the normally closed one-way sealing component achieves a normal seal. It is equipped with a mechanical interlocking structure consisting of transmission, linkage, push, and blocking components. The complete reset stroke of the conical valve head 304 is a prerequisite for unblocking the nozzle. When the valve core is not completely sealed due to ice blockage or impurities, the hydrogen refueling nozzle is self-locked. This structure eliminates the risk of hydrogen leakage caused by pulling the nozzle under pressure. It takes into account the convenience of conventional hydrogen refueling operation and the inherent safety under complex high and low temperature conditions. At the same time, it reduces valve core wear and jamming failures and extends the service life of the hydrogen refueling port.

[0022] Preferably, the one-way sealing assembly includes a conical opening 301 at one end of the valve sleeve 102 facing the hydrogen filling port connecting bolt 101, a conical valve head 304 matching the conical opening 301, an installation cavity 302 communicating with the hydrogen filling port connecting bolt 101, and after the valve sleeve 102 and the hydrogen filling port connecting bolt 101 are installed, the conical opening 301 and the installation cavity 302 make the hydrogen filling port connecting bolt 101 and the valve sleeve 102 communicate with each other, an installation plate 303 is provided inside the installation cavity 302, and the conical valve head 304 is fixed on the installation plate 303; It should be noted that before using the hydrogen refueling port of the vehicle-mounted hydrogen storage tank, the valve sleeve 102 is installed on the hydrogen refueling port connecting bolt 101 by means of threads. During the installation process, the first spring 403 in the elastic component is in a compressed state, continuously applying a pushing force to the mounting plate 303, so that the conical valve head 304 fixed on the mounting plate 303 fits tightly against the conical opening 301 of the valve sleeve 102, so that the one-way sealing component always maintains a sealed state when hydrogen is not added, effectively preventing external dust and moisture from entering the pipeline.

[0023] Preferably, the elastic component includes multiple sets of sleeves 401 fixed inside the mounting cavity 302, and the multiple sets of sleeves 401 are evenly distributed inside the mounting cavity 302. A slide rod 402 is slidably connected to the sleeve 401. One end of the slide rod 402 is fixed to the mounting plate 303. A first spring 403 is sleeved on the outside of the sleeve 401. The two ends of the first spring 403 are respectively abutted against the inner wall of the mounting cavity 302 and the mounting plate 303. After the valve sleeve 102 is installed with the hydrogen filling port connecting bolt 101, the elastic force of the first spring 403 on the mounting plate 303 and the conical valve head 304 causes the conical valve head 304 to abut against the conical port 301, thus sealing the gap between the valve sleeve 102 and the hydrogen filling port connecting bolt 101. It should be noted that: multiple sets of sleeves 401 and slide rods 402 assist in guiding the extension and retraction of the mounting plate 303, and the first spring 403 facilitates the elastic pushing of the mounting plate 303.

[0024] Preferably, the air intake filter assembly includes a filter cartridge 501, one end of which is integrally formed with an mounting sleeve 502. The mounting sleeve 502 is detachably installed from the inside of the valve sleeve 102 by means of threads. After installation, the inside of the filter cartridge 501 communicates with the conical opening 301. Multiple sets of filter grooves 503 are provided on the filter cartridge 501 for filtering the gas entering the inside of the valve sleeve 102. It should be noted here that during the hydrogen refueling process, the high-pressure pre-cooled hydrogen gas from the hydrogen refueling station enters the valve sleeve 102 through the delivery pipe 201 and positioning pipe 202 of the hydrogen refueling gun. The hydrogen gas first flows through the air intake filter assembly inside the valve sleeve 102, and through the multiple sets of filter grooves 503 on the surface of the filter cylinder 501, the metal debris, dust and solid impurities in the hydrogen medium are precisely filtered to prevent impurities from entering the rear sealing structure and causing wear and jamming of the valve core. As the high-pressure hydrogen gas continues to flow in.

[0025] Preferably, the blocking assembly includes an annular groove 601 formed inside the positioning tube 202. A plurality of blocking plates 602 for engaging with the annular groove 601 are telescopically connected to one side of the filter cylinder 501 via a telescopic assembly along the radial direction of the filter cylinder 501, and the blocking plates 602 are arranged in a ring array. It should be noted that during the process of the conical valve head 304 moving away from the conical port 301, the transmission assembly, linkage assembly, pushing assembly and telescopic assembly work together to drive multiple sets of baffles 602 to move radially to the inner side of the annular groove 601. The baffles 602 and the annular groove 601 block the hydrogenation gun tube from being pulled out.

[0026] Preferably, the telescopic assembly includes a mounting bracket 701 fixed to one end of the filter cartridge 501, a plurality of mounting cartridges 702 fixed on the mounting bracket 701, a telescopic rod 703 slidably connected to the mounting cartridge 702, and one end of the telescopic rod 703 fixed to the baffle plate 602. It should be noted here that: through the cooperation of multiple sets of telescopic rods 703 and mounting cylinder 702 between the mounting bracket 701 and the baffle plate 602, the movement of the baffle plate 602 after being subjected to force is guided by telescopic movement.

[0027] Preferably, the pushing component includes a pushing ring 801 disposed between the filter cartridge 501 and the baffle plate 602, and the pushing ring 801 and the filter cartridge 501 are concentrically arranged. A transmission plate 802 is fixed on the baffle plate 602, and a groove 803 is provided on the transmission plate 802. A transmission pin 804 is slidably connected to the groove 803, and the transmission pin 804 and the pushing ring 801 are connected and fixed by a fixing bracket 805. It should be noted here that: through transmission, the push ring 801 drives the transmission pin 804 to slide along the inclined groove 803 of the transmission plate 802 through the fixed frame 805. Utilizing the guiding effect of the inclined surface of the inclined groove 803 and the guiding effect of the telescopic component, multiple sets of blocking plates 602 are driven to retract radially inward. Through the retraction of each set of blocking plates 602, interference with the insertion of the positioning tube 202 is avoided.

[0028] Preferably, the transmission assembly includes a transmission disc 901 disposed inside the filter cylinder 501, a transmission rod 902 fixed on the transmission disc 901 for abutting against the end of the conical valve head 304, and a linkage assembly for auxiliary linkage between the transmission disc 901 and the push ring 801; the linkage assembly includes a connecting rod 1001 slidably connected to the filter cylinder 501, with each set of connecting rods 1001 arranged in a circular array on the filter cylinder 501, and both ends of the connecting rod 1001 fixed to the transmission disc 901 and the push ring 801 respectively. A second spring 1002 is sleeved on the outside. The two ends of the second spring 1002 are respectively abutted against the outside of the filter cylinder 501 and the push ring 801. When the conical valve head 304 is fully reset, the conical valve head 304 abuts against one end of the transmission rod 902. In conjunction with the linkage assembly, the push assembly and the telescopic assembly, each set of blocking plates 602 slides out of the annular groove 601. When the conical valve head 304 is not fully reset, through transmission, each set of blocking plates 602 does not slide out of the annular groove 601 completely, maintaining the obstruction of the positioning tube 202, so that the hydrogenation gun tube cannot be separated. It should be noted that during the process of the conical valve head 304 being pushed by the elastic force towards the conical opening 301 and sealing against it, the conical valve head 304 fully pushes the transmission rod 902 and the transmission disc 901 forward. The transmission disc 901 drives the push ring 801 to move axially synchronously through the connecting rods 1001 arranged in a ring array. The push ring 801 drives the transmission pin 804 to slide along the inclined groove 803 of the transmission plate 802 through the fixed frame 805.

[0029] Preferably, the inner side of the valve sleeve 102 is provided with a positioning groove 11 for the positioning tube 202 to be pushed in and positioned; It should be noted here that the positioning tube 202 at the end of the hydrogenation gun tube is aligned with the inside of the valve sleeve 102 and inserted. The positioning tube 202 is precisely inserted through the positioning groove 11 on the inner side of the valve sleeve 102 to ensure the coaxiality of the assembly.

[0030] In this solution: a hydrogen refueling port for an on-board hydrogen storage tank includes the following steps: Before using the hydrogen refueling port of the vehicle-mounted hydrogen storage tank, the valve sleeve 102 is threaded onto the hydrogen refueling port connecting bolt 101. During installation, the first spring 403 in the elastic assembly is compressed, continuously applying a pushing force to the mounting plate 303, causing the conical valve head 304 fixed on the mounting plate 303 to fit tightly against the conical opening 301 of the valve sleeve 102. This ensures that the one-way sealing assembly remains sealed even when no hydrogen is being added, effectively preventing external dust and moisture from entering the pipeline. After the valve sleeve 102 is threaded onto the hydrogen refueling port connecting bolt 101, the pipeline connection channel is normally closed. Before hydrogen refueling, the protective cover 103 on the front side of the valve sleeve 102 is removed, and the positioning tube 202 at the end of the hydrogen refueling gun is aligned with and inserted into the valve sleeve 102. The positioning tube 202 is precisely inserted through the positioning groove 11 on the inner side of the valve sleeve 102, ensuring assembly coaxiality. After 202 is inserted into place, the locking sleeve 203 cooperates with the locking component to achieve mechanical locking and fixation between the hydrogenation gun tube and the valve sleeve 102, completing the pre-hydrogenation sealing assembly and ensuring that the docking position is not loose or leaking during high-pressure hydrogenation. During the process of the conical valve head 304 being pushed by the elastic force towards the conical opening 301 and sealing against it, the conical valve head 304 fully pushes the transmission rod 902 and the transmission disc 901 forward. The transmission disc 901 drives the push ring 801 to move axially synchronously through the connecting rod 1001 arranged in a ring array. The push ring 801 drives the transmission pin 804 to slide along the inclined groove 803 of the transmission plate 802 through the fixed frame 805. Utilizing the inclined surface guiding effect of the inclined groove 803 and the guiding effect of the telescopic component, multiple sets of blocking plates 602 are driven to retract radially inward. Through the retraction of each set of blocking plates 602, interference with the insertion of the positioning tube 202 is avoided. During the hydrogen refueling process, high-pressure pre-cooled hydrogen gas from the hydrogen refueling station enters the valve sleeve 102 through the delivery pipe 201 and positioning pipe 202 of the hydrogen refueling nozzle. The hydrogen gas first flows through the air intake filter assembly inside the valve sleeve 102, where multiple sets of filter grooves 503 on the surface of the filter cylinder 501 precisely filter metal debris, dust, and solid impurities in the hydrogen medium, preventing impurities from entering the rear sealing structure and causing valve core wear or jamming. As high-pressure hydrogen gas continues to flow in, the hydrogen pressure acts on the conical valve head 304 of the one-way sealing assembly, overcoming the pre-tightening force of the first spring 403 in the elastic assembly, and pushing the mounting plate 303 along the sleeve 401. The slide bar 402 moves backward in the guiding direction, causing the conical valve head 304 to disengage from the conical port 301. The conical port 301 is fully open, and the filtered high-pressure hydrogen gas is introduced into the vehicle hydrogen storage tank through the conical port 301 and the mounting cavity 302 of the hydrogen filling port connecting bolt 101, completing the vehicle hydrogen storage and refueling operation. During the movement of the conical valve head 304 disengaging from the conical port 301, the transmission component, linkage component, push component and telescopic component work together to drive multiple sets of baffles 602 to move radially to the inner side of the annular groove 601. The baffles 602 and the annular groove 601 block the hydrogen refueling gun tube from being pulled out. When the pressure of the on-board hydrogen storage tank reaches the rated refueling pressure, the hydrogen refueling station stops supplying gas and depressurizes the internal flow channel of the hydrogen refueling nozzle. The hydrogen pressure inside the valve sleeve 102 gradually decreases, and the air intake thrust acting on the conical valve head 304 gradually disappears. At this time, the multiple sets of first springs 403 of the elastic component release elastic potential energy, pushing the mounting plate 303 and the conical valve head 304 to reset forward, so that the conical valve head 304 gradually fits into the conical opening 301, achieving the sealing of the hydrogen refueling port channel. During this process, the end of the conical valve head 304 simultaneously contacts and presses against the transmission rod 902 inside the filter cartridge 501, driving the transmission plate 901 to generate axial displacement. When the conical valve head 304 is free from ice and impurities and fully reset to fit the conical opening 301, the conical valve head 304 is fully reset. During the reset process, through the cooperation of the transmission component, linkage component, push component and telescopic component, multiple sets of baffle plates 602 are driven to retract radially inward, so that the baffle plates 602 are completely disengaged from the annular groove 601 inside the positioning tube 202, and the blocking of the hydrogen charging gun tube is released. At this time, the operator can normally operate the locking component to unlock and pull the hydrogen charging gun tube out from the inside of the valve sleeve 102. The whole process is sealed reliably and there is no hydrogen leakage. Under low-temperature hydrogenation conditions, the pre-cooled hydrogen carrying trace amounts of water vapor is prone to condensation and freezing at the throttling position inside the valve sleeve 102, or hydrogenation impurities may remain between the sealing surfaces, causing the conical valve head 304 to be stuck by ice slag and impurities. This results in incomplete reset faults such as delayed reset and incomplete closure. At this time, the conical valve head 304 cannot fully push the transmission rod 902, and the linkage stroke of the transmission disc 901, connecting rod 1001, and push ring 801 is insufficient. The push assembly cannot drive the baffle plate 602 to fully retract radially, and multiple sets of baffle plates 602 remain stuck in the annular groove 601 of the positioning tube 202. The unit continuously maintains axial limiting and blocking of the hydrogen refueling nozzle. In this self-locking state, even if the operator performs an unlocking operation, the hydrogen refueling nozzle cannot be separated from the valve sleeve 102, forcibly locking the nozzle pulling action. Through the structural linkage self-locking mechanism, the problem of high-pressure hydrogen leakage caused by the valve core not being properly sealed and the nozzle being pulled under pressure is fundamentally avoided. This completely solves the safety hazards of leakage caused by rapid nozzle pulling, ice blockage, and impurities blocking the valve. After the staff has checked the fault, removed the ice and impurities, and completely reset and sealed the conical valve head 304, the blocking component can be linked to unlock and restore the normal nozzle pulling function.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrogen refueling port for an on-board hydrogen storage tank, comprising: A hydrogen refueling port connecting bolt (101) is used for installation and connection with the vehicle-mounted hydrogen storage tank. A valve sleeve (102) for connection with the hydrogen refueling gun tube is detachably installed on the hydrogen refueling port connecting bolt (101) by means of threads. A protective cover (103) is installed on the front side of the valve sleeve (102). The hydrogen refueling gun tube includes a delivery pipe (201). A positioning pipe (202) is fixed at one end of the delivery pipe (201). A locking sleeve (203) is sleeved on the outside of the positioning pipe (202). A locking component is provided on the locking sleeve (203) for locking and fixing with the valve sleeve (102). Its characteristic is that it further includes: A one-way plugging assembly is disposed between the valve sleeve (102) and the hydrogen filling port connecting bolt (101) for one-way plugging after hydrogenation. The one-way plugging assembly is provided with a conical valve head (304) and an elastic component for assisting in squeezing and pushing the conical valve head (304). An intake filter assembly is located inside the valve sleeve (102) and is used for filtration during the hydrogen delivery process; In addition, a blocking component is provided between the air intake filter assembly and the positioning tube (202) to block the positioning tube (202). A pushing component is provided between the filter assembly and the blocking component to assist in pushing the blocking component. A transmission component is provided between the air intake filter assembly and the conical valve head (304) for transmission. Under the interaction of the transmission component, the pushing component and the blocking component, the conical valve head (304) is kept in a limiting position to block the positioning tube (202) when it is not properly reset, so as to avoid hydrogen leakage.

2. The hydrogen refueling port for a vehicle-mounted hydrogen storage tank according to claim 1, characterized in that: The one-way sealing assembly includes a conical opening (301) on the end of the valve sleeve (102) facing the hydrogen filling port connecting bolt (101). The conical valve head (304) is matched with the conical opening (301). The hydrogen filling port connecting bolt (101) has a through-hole (302). After the valve sleeve (102) and the hydrogen filling port connecting bolt (101) are installed, the conical opening (301) and the installation cavity (302) make the hydrogen filling port connecting bolt (101) and the valve sleeve (102) communicate with each other. The installation cavity (302) is provided with an installation plate (303). The conical valve head (304) is fixed on the installation plate (303).

3. The hydrogen refueling port for a vehicle-mounted hydrogen storage tank according to claim 2, characterized in that: The elastic component includes multiple sets of sleeves (401) fixed inside the mounting cavity (302), and the multiple sets of sleeves (401) are evenly distributed inside the mounting cavity (302). A sliding rod (402) is slidably connected to the sleeve (401). One end of the sliding rod (402) is fixed to the mounting plate (303). A first spring (403) is sleeved on the outside of the sleeve (401). The two ends of the first spring (403) are respectively abutted against the inner wall of the mounting cavity (302) and the mounting plate (303). After the valve sleeve (102) is installed with the hydrogen filling port connecting bolt (101), the elastic force of the first spring (403) on the mounting plate (303) and the conical valve head (304) causes the conical valve head (304) to abut against the conical port (301), thus sealing the gap between the valve sleeve (102) and the hydrogen filling port connecting bolt (101).

4. The hydrogen refueling port for an on-board hydrogen storage tank according to claim 2, characterized in that: The air intake filter assembly includes a filter cylinder (501), one end of which is integrally formed with an installation sleeve (502). The installation sleeve (502) is detachably installed to the inside of the valve sleeve (102) by means of threads. After installation, the inside of the filter cylinder (501) communicates with the conical opening (301). Multiple sets of filter grooves (503) are opened on the filter cylinder (501) for filtering the gas entering the inside of the valve sleeve (102).

5. The hydrogen refueling port for an on-board hydrogen storage tank according to claim 4, characterized in that: The blocking assembly includes an annular groove (601) opened inside the positioning tube (202). One side of the filter cylinder (501) is connected to multiple sets of blocking plates (602) for blocking the annular groove (601) by means of a telescopic assembly along the radial direction of the filter cylinder (501), and the blocking plates (602) are arranged in a ring array.

6. The hydrogen refueling port for an on-board hydrogen storage tank according to claim 5, characterized in that: The telescopic assembly includes a mounting bracket (701) fixed to one end of the filter cartridge (501), a plurality of mounting cylinders (702) are fixed on the mounting bracket (701), and a telescopic rod (703) is slidably connected to the mounting cylinder (702), one end of the telescopic rod (703) is fixed to the baffle plate (602).

7. The hydrogen refueling port for an on-board hydrogen storage tank according to claim 6, characterized in that: The pushing assembly includes a pushing ring (801) disposed between the filter cylinder (501) and the baffle plate (602), and the pushing ring (801) and the filter cylinder (501) are concentrically arranged. A transmission plate (802) is fixed on the baffle plate (602), and a groove (803) is provided on the transmission plate (802). A transmission pin (804) is slidably connected on the groove (803), and the transmission pin (804) and the pushing ring (801) are connected and fixed by a fixing bracket (805).

8. The hydrogen refueling port for a vehicle-mounted hydrogen storage tank according to claim 7, characterized in that: The transmission assembly includes a transmission disc (901) disposed inside the filter cylinder (501), and a transmission rod (902) fixed on the transmission disc (901) for abutting and driving against the end of the conical valve head (304). A linkage assembly for auxiliary linkage is disposed between the transmission disc (901) and the push ring (801).

9. A hydrogen refueling port for a vehicle-mounted hydrogen storage tank according to claim 8, characterized in that: The linkage assembly includes a connecting rod (1001) slidably connected to the filter cylinder (501). Each set of connecting rods (1001) is arranged in a circular array on the filter cylinder (501). The two ends of each connecting rod (1001) are fixed to the transmission disc (901) and the push ring (801), respectively. A second spring (1002) is sleeved on the outer side of each connecting rod (1001). The two ends of the second spring (1002) are respectively connected to the outer side of the filter cylinder (501) and the push ring. (801) The cone valve head (304) is set to abut against one end of the transmission rod (902) when the cone valve head (304) is fully reset. This abuts against the transmission rod (902) and works with the linkage assembly, the push assembly and the telescopic assembly to make each set of blocking plates (602) slide out of the annular groove (601). However, when the cone valve head (304) is not fully reset, the blocking plates (602) do not slide out of the annular groove (601) through the transmission, thus blocking the positioning tube (202) and preventing the hydrogenation gun tube from separating.

10. A hydrogen refueling port for an on-board hydrogen storage tank according to claim 1, characterized in that: The valve sleeve (102) has a positioning groove (11) on its inner side for positioning the positioning tube (202) to be pushed in and positioned.

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