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CN-122014993-A - Hydrogen filling nozzle

CN122014993ACN 122014993 ACN122014993 ACN 122014993ACN-122014993-A

Abstract

The invention relates to the technical field of high-pressure hydrogen storage bottles, in particular to a hydrogen filling nozzle, which comprises a jet pipe communicated with a channel in a valve and used for high-pressure hydrogen to flow, and an air nozzle communicated with the jet pipe and formed at the front end of the jet pipe and bent towards the inner container of the bottle body, wherein a connecting line of the circle centers of the end surfaces of the two ends of the bottle body is a central longitudinal axis, a preset included angle of 5-15 degrees is formed between the central line and the central longitudinal axis of the air nozzle, the high-pressure hydrogen is guided to diffuse along the inner wall of the inner container of the bottle body, the flowing vortex and the turbulent intensity are weakened, the flowing vortex and the turbulent intensity are guided to uniformly diffuse along the inner wall of the bottle body, the local gas compression heating is avoided, and the local temperature hot spot on the surface of the inner container is further restrained, the problems that in the prior art, the turbulent flow is easy to form and the temperature hot spot is formed when the hydrogen is filled are solved, and the safety and the durability of the high-pressure hydrogen storage system are improved.

Inventors

  • Karl Heinz Toller
  • Mohammed Nurbaksh

Assignees

  • 福士汽车零部件（济南）有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (7)

  1. 1. The utility model provides a hydrogen filling nozzle, is used for hydrogen fuel vehicle high pressure hydrogen storage bottle's bottleneck valve, hydrogen fuel vehicle high pressure hydrogen storage bottle is including the bottle that has inner bag and shell, sealed install in the bottleneck valve of bottle bottleneck department, the bottleneck valve includes the valve body, locates the check valve in the valve body and supplies the interior passageway of valve that hydrogen circulated, its characterized in that, hydrogen filling nozzle includes the injection pipe that communicates and high pressure hydrogen circulated with the interior passageway of valve to and with the injection pipe intercommunication forms at the injection pipe front end and the air nozzle of buckling towards the bottle inner bag, the line of bottle both ends terminal surface centre of a circle is central vertical axis, form 5 ~15 predetermine contained angle between the central line of air nozzle and the central vertical axis, through guiding high pressure hydrogen along the inner wall diffusion of bottle inner bag, weaken flow vortex and turbulent flow intensity.
  2. 2. The hydrogen filling nozzle according to claim 1, wherein the centerline of the injection tube is offset in a radial direction perpendicular to the central longitudinal axis.
  3. 3. A hydrogen filling nozzle according to claim 2, wherein the distance between the centre line of the injection tube and the central longitudinal axis is an eccentric distance, and the eccentric distance is in the range of 1mm to 10mm.
  4. 4. The hydrogen filling nozzle according to claim 1, wherein one end of the injection pipe is provided with an external thread structure, the tail end of the valve inner channel of the bottleneck valve is provided with a matched internal thread structure, the injection pipe is detachably and fixedly assembled with the bottleneck valve through threaded connection, the hydrogen filling nozzle is of a replaceable structure, and the hydrogen filling nozzle corresponding to a preset included angle and an eccentric distance is replaced according to the length and the inner diameter size of the bottle body.
  5. 5. The hydrogen filling nozzle according to claim 1, wherein a communicating pipe is provided in the injection pipe, the communicating pipe being disposed opposite to a gas flow passage in the check valve, a gas flow gap being formed between the communicating pipe and the gas flow passage, the gas flow gap having a longitudinal dimension.
  6. 6. A hydrogen filling nozzle according to claim 5, wherein the longitudinal dimension is 2mm and the longitudinal dimension remains constant throughout the reciprocal movement of the one-way valve in the direction of the central longitudinal axis.
  7. 7. The hydrogen filling nozzle according to claim 1, wherein the cross-sectional shape of the gas nozzle is circular, and the inner diameter of the gas nozzle is 2mm to 8mm.

Description

Hydrogen filling nozzle Technical Field The invention relates to the technical field of high-pressure hydrogen storage bottles, in particular to a hydrogen filling nozzle. Background With the rapid development of the hydrogen fuel cell automobile industry, the safety and the filling performance of a high-pressure hydrogen storage system as a core component directly affect the running reliability of a vehicle. The high-pressure hydrogen storage bottle of the hydrogen fuel vehicle generally comprises a bottle body with an inner container and a shell, and a bottle mouth valve arranged at the bottle mouth of the bottle body in a sealing way, wherein a one-way valve and an intra-valve channel for hydrogen circulation are arranged in the bottle mouth valve, and a hydrogen filling nozzle is used as a key component part of the bottle mouth valve, so that the basic function of hydrogen filling is carried out, and the flow stability and the temperature uniformity of hydrogen in the bottle body are ensured. In the high-pressure hydrogen filling process, hydrogen enters the bottle body through the nozzle at the super Mach speed, the hydrogen filling nozzle in the prior art is realized by only realizing the side filling function, and the fluid dynamics optimization design is not carried out on key parameters such as the injection angle, the installation position and the like. The high-speed hydrogen is easy to form strong turbulence and flow vortex after entering the bottle body, so that on one hand, the hydrogen is unevenly distributed in the bottle body, and on the other hand, residual gas at the rear part of the bottle body can be compressed to cause local heating, and obvious temperature hot spots are formed. The temperature hot spot can generate obvious thermal stress, directly damages the structural integrity of the liner of the hydrogen storage cylinder, possibly causes the liner to melt, causes the premature fatigue failure of the hydrogen storage cylinder, greatly shortens the service life of the hydrogen storage cylinder, becomes a technical pain point for restricting the safety and durability of the high-pressure hydrogen storage system, and meanwhile, the gap between the check valve and the nozzle is unreasonable in design, is easy to aggravate fluid disturbance, and further aggravates the problems of turbulence and uneven temperature distribution. Therefore, there is a need to develop a hydrogen filling nozzle capable of suppressing turbulence generation and formation of temperature hot spots, so as to solve the potential safety hazard problem existing in the prior art. Disclosure of Invention The embodiment of the application solves the problems that in the prior art, turbulence is easy to form and temperature hot spots are formed when hydrogen is filled by providing the hydrogen filling nozzle, thereby improving the safety and durability of a high-pressure hydrogen storage system. The embodiment of the application provides a hydrogen filling nozzle, which is used for a bottleneck valve of a high-pressure hydrogen storage cylinder of a hydrogen fuel vehicle, the high-pressure hydrogen storage cylinder of the hydrogen fuel vehicle comprises a cylinder body with an inner container and a shell, the bottleneck valve is arranged at the bottleneck of the cylinder body in a sealing way, the bottleneck valve comprises a valve body, a one-way valve arranged in the valve body and an intra-valve channel for hydrogen to circulate, the hydrogen filling nozzle comprises an injection pipe communicated with the intra-valve channel and used for high-pressure hydrogen to circulate, and an air nozzle communicated with the injection pipe and formed at the front end of the injection pipe and bent towards the inner container of the cylinder body, the connecting line of the circle centers of the end surfaces of the two ends of the cylinder body is a central longitudinal axis, a preset included angle of 5-15 degrees is formed between the central line of the air nozzle and the central longitudinal axis, and the flowing vortex and turbulent flow strength are weakened by guiding the high-pressure hydrogen to diffuse along the inner wall of the inner container of the cylinder body. Further, the centerline of the ejector tube is offset in a radial direction perpendicular to the central longitudinal axis. Further, the distance between the central line of the jet pipe and the central longitudinal axis is an eccentric distance, and the value of the eccentric distance is 1mm to 10mm. Further, one end of the injection pipe is provided with an external thread structure, the tail end of the valve inner channel of the bottleneck valve is provided with a matched internal thread structure, the injection pipe is detachably and fixedly assembled with the bottleneck valve through threaded connection, the hydrogen filling nozzle is of a replaceable structure, and the hydrogen filling nozzle corresponding to a preset included angle and an eccentric