High-pressure oxygen storage and supply system for underwater fuel cell system

Abstract

According to the high-pressure oxygen storage and supply system for the underwater fuel cell system, the pipe part of a cable penetrating pipe penetrates through a composite gas cylinder and is tightly connected with the inner peripheries of a head-end bottle mouth and a tail-end bottle mouth of the composite gas cylinder in an abutting mode through a sealing piece, the cap part of the cable penetrating pipe is tightly connected with the tail-end bottle mouth through a locking piece, and a cable is arranged on the inner side of the head-end bottle mouth of the composite gas cylinder. A plurality of flow guide pipes are uniformly arranged around the cable penetrating pipe in the axial direction of the composite gas cylinder and are connected with the annular flow channel on the bottle mouth at the head end, a plurality of gas passing openings communicated with inner cavities of the flow guide pipes are formed in the peripheries of the flow guide pipes, and the two ends of the composite gas cylinder are connected with the skirt edges in a clamped and embedded mode; cabin section connecting through holes are formed in cabin section connecting ends, used for connecting the front cabin and the rear cabin, of the skirt edges; according to the system, reasonable area division of the cable penetrating pipe and the flow guide pipe and scientific space layout are achieved, the overall sealing performance is considered, in addition, through the design of the skirt edge, the system can serve as a functional component to provide a high-pressure gas source for a whole underwater device power system, and the system can also serve as a cabin section structure to be used.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure oxygen storage and supply, and in particular to a high-pressure oxygen storage and supply system for an underwater fuel cell system. Background Art

[0002] In the prior art, a high-pressure oxygen system is applied to the power system of an underwater device and used as a pure oxygen supply source. A composite gas cylinder is used as a storage container for oxygen. The composite gas cylinder is used as a structural compartment of the underwater device. Both ends of the composite gas cylinder are connected to the front and rear compartments through a sealing connection structure and sealed. A high-pressure resistant metal conduit that passes through the composite gas cylinder is provided at the axial middle position of the composite gas cylinder and used as a bottle-threading channel for cables. A flow guide pipe connected to an external air inlet and exhaust pipe is provided in the inner cavity of the composite gas cylinder and used for inflation and exhaust. Moreover, the composite gas cylinder as a whole is used as a structural compartment of the underwater device, and both ends of the composite gas cylinder are connected to the front and rear compartments through a connecting structure.

[0003] However, the hyperbaric oxygen system still has the following problems in actual use:

[0004] 1. Most of them use a single guide tube, and the nozzle of the guide tube is directly facing the axial inner bottom of the composite gas cylinder. This design makes the high-pressure oxygen rush directly to the bottom of the composite gas cylinder for a long time when the composite gas cylinder is filled with high-pressure oxygen, thereby reducing the service life of the composite gas cylinder. In addition, due to the fast flow rate, the temperature rise in the composite gas cylinder is also accelerated, which makes the entire high-pressure oxygen system have safety hazards;

[0005] 2. The integration of the entire hyperbaric oxygen system is low, and the overall structure occupies a large space;

[0006] 3. Composite gas cylinders are usually placed in the structural cabin, and composite gas cylinders embedded in the metal skirt that acts as the cabin body have not been used. Although connecting structures are directly constructed on both ends of the composite gas cylinder, although this can also achieve connection with the front and rear cabin sections, there are design problems and molding process problems with the connection strength between the metal skirt and the composite material and the overall load-bearing capacity of the composite gas cylinder. Summary of the invention

[0007] In view of this, the problem to be solved by the present invention is to provide a high-pressure oxygen storage and supply system for an underwater fuel cell system.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A high-pressure oxygen storage and supply system for an underwater fuel cell system, wherein the tube portion of the cable threading tube penetrates through a composite gas cylinder and is tightly connected to the inner circumference of the first end bottle mouth and the tail end bottle mouth of the composite gas cylinder through a seal, and the cap portion of the cable threading tube is tightly connected to the tail end bottle mouth through a locking member, and on the inner side of the first end bottle mouth of the composite gas cylinder, a plurality of guide tubes are evenly arranged around the cable threading tube along the axial direction of the composite gas cylinder and are connected to the annular flow channel on the first end bottle mouth, a plurality of air ports connected to the inner cavity of the guide tube are provided on the outer circumference of the guide tube, and both ends of the composite gas cylinder are snap-connected to the skirt, and a cabin section connection through-hole is provided on the cabin section connecting end of the skirt for connecting the front and rear cabins.

[0010] The sealing member is a sealing ring, and the inner circumferences of the first end bottle mouth and the tail end bottle mouth are both constructed with embedding grooves corresponding to the sealing rings; the locking member is a threaded pressure ring, and the inner circumference of the tail end bottle mouth is constructed with a reverse thread that matches the threaded pressure ring.

[0011] An annular groove is constructed on the bottle mouth at the head end and is sunken along the axial direction of the composite gas cylinder. An axial sealing ring plate is fixed at the top opening of the annular groove and then encloses the annular flow channel with the annular groove.

[0012] A first air hole is constructed on the side wall of the annular groove, and a second air hole is constructed on the bottom of the annular groove; the annular groove is connected to the intake and exhaust pipes through the first air hole, and is fixedly connected to the guide pipe through the second air hole.

[0013] The guide pipe is designed as a cylindrical structure, and a filter cover is sleeved on the closed end of the guide pipe, and the filter cover covers the air outlet.

[0014] The gas cylinder connecting end on the skirt for sleeve connection with the composite gas cylinder is a comb-shaped structure with uniformly distributed deformation gaps, and the transverse cross-sectional area of ​​the gas cylinder connecting end decreases along the direction approaching the composite gas cylinder.

[0015] An inner liner positioning column is constructed on the outer circumference of the composite gas cylinder, and an annular inner concave embedding groove corresponding to the inner liner positioning column is constructed on the inner circumference of the skirt.

[0016] The advantages and positive effects of the present invention are:

[0017] (1) The uniform arrangement of a plurality of flow guide pipes in the composite gas cylinder makes the composite gas cylinder uniformly pressurized during inflation, and the radial gas inlet arrangement makes it possible for the high-pressure oxygen to diffuse uniformly from the radial direction of the composite gas cylinder to the interior of the composite gas cylinder during inflation, thereby controlling the direction and velocity of the airflow during the inflation and deflation process, thereby controlling the temperature rise of the composite gas cylinder and improving the overall safety.

[0018] (2) The tube portion penetrates the composite gas cylinder and is tightly connected to the inner circumference of the first end bottle mouth and the rear end bottle mouth of the composite gas cylinder through the sealing member. The two ends of the cap portion are tightly connected to the step platform and the locking member respectively. Then, the step platform and the locking member clamp the cap portion to play an axial limiting role for the cable passing through the tube. On the premise of ensuring the sealing, the cable passing through the tube can be prevented from being separated from the composite gas cylinder.

[0019] (3) The front and rear compartments are connected by adding a skirt, and the skirt and the composite gas cylinder are connected by a snap-in connection method, which not only meets the connection requirements between the front and rear compartments and the composite gas cylinder, but also does not destroy the integrity of the composite gas cylinder, thereby ensuring the overall strength of the composite gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached picture:

[0022] Figure 1 is a cross-sectional view of a high-pressure oxygen storage and supply system for an underwater fuel cell system;

[0023] Figure 2 yes Figure 1 A magnified view of the bottle mouth at the first end;

[0024] Figure 3 yes Figure 1 A magnified view of the bottle mouth at the end;

[0025] Figure 4 This is an enlarged view of the axial sealing ring plate and the cable tube hidden at the bottle mouth at the first end;

[0026] Figure 5 It is the overall structural diagram of the hidden skirt of the high-pressure oxygen storage and supply system for the underwater fuel cell system;

[0027] Figure 6 It is the overall structural diagram of the high-pressure oxygen storage and supply system for the underwater fuel cell system;

[0028] Figure 7 It is a structural diagram of the skirts connected at both ends of the composite gas cylinder;

[0029] Figure 8 This is an enlarged view of the compartment connection perforation on the compartment connection end;

[0030] Fig. 9 It is a structural diagram of the skirt;

[0031] Fig.10 It is an enlarged view of the skirt edge in the annular recessed groove;

[0032] Fig.11 yes Figure 1 Structural diagram of hiding the skirt at one end;

[0033] Fig.12 This is an enlarged view of the liner positioning column;

[0034] In the figure: cable conduit 1, pipe part 11, cap part 12, gas cylinder connection end 14, compartment connection end 15, compartment connection through hole 16, groove 17, skirt 18, deformation gap 19, composite gas cylinder 2, embedded groove 21, step platform 22, annular groove 23, second air hole 24, axial sealing ring plate 25, guide pipe 26, air port 261, liner positioning column 27, filter cover 29, sealing gasket 31, threaded pressure ring 32, sealing ring 33, air inlet and exhaust pipe 41, annular inner concave embedded groove 28, second-order composite layer 52. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] like Figures 1 to 5As shown, the present invention provides a high-pressure oxygen storage and supply system for an underwater fuel cell system. The transverse cross-section of the cable tube 1 is a T-shaped structure, including a tube portion 11 and a cap portion 12 constructed on the end side of the tube portion 11. The tube portion 11 passes through the composite gas cylinder 2 and is tightly connected to the inner periphery of the first end bottle mouth and the tail end bottle mouth of the composite gas cylinder 2 through a sealing member, thereby achieving sealing between the tube portion 11 and the first end bottle mouth and the tail end bottle mouth. A step platform 22 is constructed in the tail end bottle mouth of the composite gas cylinder 2. The two ends of the cap portion 12 are tightly connected to the step platform 22 and the locking member respectively. The locking member is detachably connected to the inner periphery of the tail end bottle mouth of the composite gas cylinder 2, and then the cable tube 1 is axially limited by clamping the step platform 22 and the locking member against the cap portion 12. On the premise of ensuring the sealing performance, the cable tube 1 can also be prevented from being separated from the composite gas cylinder 2.

[0039] On the inner side of the first end of the composite gas cylinder 2, a plurality of flow guide tubes 26 are evenly arranged around the cable threading tube 1 along the axial direction of the composite gas cylinder 2 and connected to the annular flow channel on the first end of the bottle mouth, and the annular flow channel is also connected to the inlet and outlet pipes 41 located outside the composite gas cylinder 2. The flow guide tube 26 is a cylindrical structure, and a plurality of gas ports 261 connected to the inner cavity of the flow guide tube 26 are opened on the outer periphery of the flow guide tube 26, thereby realizing high-pressure oxygen entering and exiting the composite gas cylinder 2 through the inlet and outlet pipes 41, the annular flow channel, and the plurality of flow guide tubes 26;

[0040] The cable conduit 1 is arranged at the axial center of the composite gas cylinder 2, and a plurality of flow guide tubes 26 are evenly arranged around the cable conduit 1, so that the plurality of flow guide tubes 26 can be evenly arranged in the composite gas cylinder 2, so that the inside of the composite gas cylinder 2 is evenly pressurized during inflation. Compared with the existing design of a single flow guide tube, the design of multiple groups of flow guide tubes 26 can evenly deliver gas to the composite gas cylinder 2 and reduce the flow rate of high-pressure oxygen, thereby avoiding excessive temperature rise inside the composite gas cylinder 2. The setting of the gas port 261 can make the high-pressure oxygen diffuse evenly from the radial direction of the composite gas cylinder 2 to the inside of the composite gas cylinder 2 during inflation, thereby controlling the direction and flow rate of the airflow during the inflation and deflation process, so as to control the temperature rise change of the composite gas cylinder 2 and improve the overall safety.

[0041] like Figures 6 to 12As shown, the skirt 18 is tubular and is provided with two groups. The gas cylinder connecting end 14 of the skirt 18 used to be put through the composite gas cylinder 2 is an elastically deformable structure, so that the skirt 18 can be put through the position of being embedded with the composite gas cylinder 2 to achieve the embedding connection between the front and rear ends of the composite gas cylinder 2 and the two groups of skirts 18. The cabin section connecting end 15 of the skirt 18 used to connect the front and rear cabins is provided with a cabin section connecting through hole 16. Bolts penetrate the through holes provided on the front and rear cabins and the cabin section connecting through hole 16 and then threadedly connect nuts to achieve the connection between the skirt 18 and the front and rear cabins; the front and rear cabins are connected by adding the skirt 18, and the skirt 18 and the composite gas cylinder 2 are connected by an embedding connection method, which not only meets the connection requirements between the front and rear cabins and the composite gas cylinder 2, but also does not destroy the integrity of the composite gas cylinder 2, thereby ensuring the overall strength of the composite gas cylinder 2;

[0042] This system realizes the reasonable area division and scientific spatial layout of the cable conduit 1 and the plurality of flow guide tubes 26 and takes into account the overall sealing. In addition, through the design of the skirt 18, this system can be used as a functional component to store and supply high-pressure gas source for the entire underwater device power system, and can also be used as a compartment structure.

[0043] Specifically, the sealing member is a sealing ring 33. During the process of injecting high-pressure oxygen into the composite gas cylinder 2, the composite gas cylinder 2 may be slightly deformed, and the design of the sealing ring 33 can adapt to the deformation of the composite gas cylinder 2 during the pressurization process, thereby ensuring sealing. The inner circumferences of the head end bottle mouth and the tail end bottle mouth are both constructed with embedding grooves 21 corresponding to the sealing ring 33. In this embodiment, two groups of embedding grooves 21 are formed on the head end bottle mouth, which are arranged in sequence along the axial direction of the cable through-tube 1, thereby playing a double sealing role. A group of embedding grooves 21 are arranged on the tail end bottle mouth on the inner cavity side of the step platform 22 close to the composite gas cylinder 2, and after the step platform 22 is tightly abutted against the cap 12, it also plays a double sealing role.

[0044] Specifically, the locking member is a threaded pressure ring 32, and a reverse thread that is compatible with the threaded pressure ring 32 is constructed on the inner circumference of the tail end bottle mouth, thereby achieving fastening and separation through threaded connection. A sealing gasket 31 is also installed between the cap portion 12 and the step platform 22, thereby ensuring the sealing of the connection between the cap portion 12 and the step platform 22.

[0045] Specifically, a filter cover 29 is mounted on the closed end of the guide tube 26, and the filter cover 29 covers the gas outlet 261. The filter cover 29 is used to filter impurity particles contained in the high-pressure oxygen to prevent them from entering the composite gas cylinder 2 with the high-pressure oxygen and causing damage to the composite gas cylinder 2.

[0046] Specifically, a plurality of slots adapted to the flow guide tube 26 are constructed on the inner side of the first end of the bottle mouth of the composite gas cylinder 2, and the flow guide tube 26 is fixed in the slots.

[0047] Specifically, an annular groove 23 is constructed on the outer side of the first end of the composite gas cylinder 2 and is sunken along the axial direction of the composite gas cylinder 2. An axial sealing ring plate 25 is welded at the top opening of the annular groove 23 and then encloses the annular flow channel with the annular groove 23. The annular flow channel is connected to the guide pipe 26, and then the high-pressure oxygen is uniformly transported to the guide pipe 26 connected thereto through the annular flow channel. A first air hole is constructed on the side wall of the annular groove 23, and a second air hole 24 is constructed on the bottom of the annular groove 23. The annular groove 23 is connected to the inlet and exhaust pipe 41 through the first air hole, and is fixedly connected to the guide pipe 26 through the second air hole 24. The inlet and exhaust pipe 41 is connected to an inlet valve and an exhaust valve.

[0048] When inflating, the air inlet valve is opened, and the high-pressure oxygen enters the annular flow channel through the air inlet and outlet pipes 41 via the first air hole, and then enters the guide pipe 26 via the second air hole 24, and is discharged into the inner cavity of the composite gas cylinder 2 via the guide pipe 26;

[0049] When supplying gas, the exhaust valve is opened, and high-pressure oxygen enters the cylindrical guide tube 26 through the air port 261. The high-pressure oxygen in each guide tube 26 is gathered in the annular flow channel through the second air hole 24 and discharged through the first air hole through the inlet and outlet pipe 41.

[0050] Furthermore, in order to solve the pressure bearing problem of the entire oxygen storage and supply system in deep water after adding the skirt 18, the present solution also creatively proposes a double-order fiber full winding structure, that is, a first-order composite layer is coated on the outer periphery of the composite gas cylinder 2, and after the two ends of the composite gas cylinder 2 are connected to the skirt 18, a second-order composite layer 52 is coated on the outer periphery of the first-order composite layer and the gas cylinder connection end 14 of the skirt 18;

[0051] Specifically, during winding, the cylindrical body of the composite gas cylinder 2 is firstly wound circumferentially, and then the arc-shaped bottle end and the cylindrical body of the composite gas cylinder 2 are spirally wound, and then the composite gas cylinder 2 is pressure-reinforced in radial and axial directions by combining circumferential and spiral directions. Then, the second-order composite layer 52 is circumferentially wound on the first-order composite layer and the gas cylinder connecting end 14 of the skirt 18 to enhance the pressure-reinforced skirt 18 and the composite gas cylinder 2, so as to meet the pressure-reinforced capacity of the entire oxygen storage and supply system in deep water.

[0052] Specifically, an inner liner positioning column 27 is constructed on the outer circumference of the composite gas cylinder 2, and an annular inner concave groove 28 corresponding to the inner liner positioning column 27 is constructed on the inner circumference of the skirt 18;

[0053] When putting on the sleeve, the elastic property of the gas cylinder connection end 14 is utilized to make the bottom surface of the skirt 18 slide along the inner liner positioning column 27 until the positioning column 27 falls into the annular inner concave groove 28, and the gas cylinder connection end 14 returns to the state before deformation, and the annular inner concave groove 28 is tightly embedded in the positioning column 27, thereby realizing the connection between the composite gas cylinder 2 and the skirt 18.

[0054] Specifically, the gas cylinder connecting end 14 is a comb-shaped structure with uniformly distributed deformation gaps 19. The transverse cross-sectional area of ​​the gas cylinder connecting end 14 decreases in the direction approaching the composite gas cylinder 2. The inner diameter of the entire skirt 18 is smaller than the outer diameter. When the composite gas cylinder 2 is connected through the sleeve, the deformation gap 19 changes, thereby realizing the deformation of the gas cylinder connecting end 14.

[0055] Specifically, a groove 17 is constructed on the outer periphery of the skirt 18, and the groove 17 provides space for the connection and installation of bolts and nuts. The cabin section connecting through hole 16 is constructed in the axial direction of the skirt 18 and passes through the side wall of the groove 17 and is connected with the inner cavity of the groove 17. After the bolt passes through the through holes opened on the front and rear cabins and the cabin section connecting through hole 16 on the skirt 18, the nut is threadedly connected in the groove 17, thereby realizing the fixation of the front and rear cabins and the skirt 18.

[0056] The working principle and working process of the present invention are as follows:

[0057] When installing the cable tube 1, firstly, the tube portion 11 of the cable tube 1 is passed through the composite gas cylinder 2 until the cap portion 12 abuts against the step platform 22, and the sealing ring 33 on the tube portion 11 is engaged with the embedded grooves 21 in the first end bottle mouth and the tail end bottle mouth, and then the threaded pressing ring 32 is connected with the inner circumference of the tail end bottle mouth through the threaded pressing ring 32, thereby realizing the tight connection between the threaded pressing ring 32, the cap portion 12, and the step platform 22, and fixing the cable tube 1 in the composite gas cylinder 2;

[0058] When installing the skirt 18, firstly, a first-order composite layer is coated on the outer circumference of the composite gas cylinder 2, and then the gas cylinder connection end 14 of the skirt 18 is aligned with the two ends of the composite gas cylinder 2 and sleeved. When the composite gas cylinder 2 is sleeved and connected, the deformation gap 19 changes, thereby realizing the deformation of the gas cylinder connection end 14, so that the bottom surface of the skirt 18 slides along the inner liner positioning column 27 until the positioning column 27 falls into the annular inner concave embedding groove 28 on the inner circumference of the skirt 18, and the gas cylinder connection end 14 restores the state before deformation, and the annular inner concave embedding groove 28 is tightly embedded in the positioning column 27, thereby realizing the fixation of the composite gas cylinder 2 and the skirt 18, and then the second-order composite layer 52 is coated on the outer circumference of the first-order composite layer and the gas cylinder connection end 14 of the skirt 18, and finally, bolts are used to penetrate the through holes opened on the front and rear cabins and the cabin section connection through holes 16 on the skirt 18, and nuts are threadedly connected in the groove 17, thereby realizing the fixation of the front and rear cabins and the skirt 18;

[0059] When high-pressure oxygen needs to be charged, the air inlet valve connected to the air inlet and outlet pipe 41 is opened, and the high-pressure oxygen enters the annular flow channel through the air inlet and outlet pipe 41 via the first air hole, and then enters the guide pipe 26 through the second air hole 24, and is discharged into the inner cavity of the composite gas cylinder 2 through the guide pipe 26;

[0060] When high-pressure oxygen needs to be charged, the outlet valve connected to the inlet and exhaust pipes 41 is opened. Under the action of high pressure, the high-pressure oxygen is discharged through the guide pipe 26, the annular flow channel, and the inlet and exhaust pipes 41 in sequence.

[0061] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A high-pressure oxygen storage and supply system for an underwater fuel cell system, characterized in that: The tube portion (11) of the cable tube (1) passes through the composite gas cylinder (2) and is tightly connected to the inner circumference of the first end bottle mouth and the rear end bottle mouth of the composite gas cylinder (2) through a sealing member. The cap portion (12) of the cable tube (1) is tightly connected to the rear end bottle mouth through a locking member. On the inner side of the first end bottle mouth of the composite gas cylinder (2), a plurality of flow guide tubes (26) are evenly arranged around the cable tube (1) along the axial direction of the composite gas cylinder (2) and are connected to the annular flow channel on the first end bottle mouth. A plurality of gas passages (261) communicating with the inner cavity of the flow guide tube (26) are provided on the outer circumference of the flow guide tube (26). The two ends of the composite gas cylinder (2) are connected to the skirt (18) by snapping. The cabin section connection through-hole (16) is provided on the cabin section connection end (15) of the skirt (18) for connecting the front and rear cabins.

2. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 1, characterized in that: The sealing member is a sealing ring (33), and the inner circumferences of the first end bottle mouth and the tail end bottle mouth are both configured with embedding grooves (21) corresponding to the sealing ring (33); the locking member is a threaded pressure ring (32), and the inner circumference of the tail end bottle mouth is configured with a reverse thread matched with the threaded pressure ring (32).

3. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 1, characterized in that: An annular groove (23) is constructed on the head end bottle mouth and is sunken along the axial direction of the composite gas bottle (2). An axial sealing ring plate (25) is fixed at the top opening of the annular groove (23) and encloses the annular flow channel with the annular groove (23).

4. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 3, characterized in that: A first air hole is constructed on the side wall of the annular groove (23), and a second air hole is constructed on the bottom of the annular groove (23); the annular groove (23) is connected to the intake and exhaust pipes (41) through the first air hole, and is fixedly connected to the guide pipe (26) through the second air hole (24).

5. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 1, characterized in that: The flow guide tube (26) is of cylindrical structure design, and a filter cover (29) is sleeved on the closed end of the flow guide tube (26), and the filter cover (29) covers the air outlet (261).

6. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 1, characterized in that: The gas cylinder connection end (14) on the skirt (18) for sleeve connection with the composite gas cylinder (2) is a comb-shaped structure evenly distributed with deformation gaps (19), and the transverse cross-sectional area of ​​the gas cylinder connection end (14) decreases in a direction approaching the composite gas cylinder (2).

7. The high-pressure oxygen storage and supply system for an underwater fuel cell system according to claim 6, characterized in that: An inner liner positioning column (27) is constructed on the outer periphery of the composite gas cylinder (2), and an annular inner concave groove (28) corresponding to the inner liner positioning column (27) is constructed on the inner periphery of the skirt (18).

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