Piston type gel oxidizing agent storage tank for fuel gas pressurization and assembly method of piston type gel oxidizing agent storage tank

Abstract

The invention provides a piston type gel oxidizing agent storage tank for gas pressurization and an assembling method of the piston type gel oxidizing agent storage tank, and relates to the technical field of aerospace craft propulsion. The piston type gel oxidizing agent storage tank comprises a metal lining, a composite material winding layer, a gas path pipe nozzle, a liquid path pipe nozzle, a piston, a guide ring and a sealing ring; a composite material winding layer is laid on the outer side of the metal lining, a piston is placed in an inner cavity of the metal lining, and oxidant injection and supply are achieved through sliding of the piston. The piston is sleeved with a guide ring and a sealing ring, and the piston divides an inner cavity of the metal lining into a fuel gas pressurization cavity and an oxidizing agent storage cavity. The storage tank provided by the invention solves the problem that the existing storage tank scheme cannot simultaneously meet the requirements of a slender structure, gas pressurization, storage and supply of a gel oxidant and light weight in a solid-liquid mixing propulsion system.

Description

Technical Field

[0001] The present invention relates to the field of aerospace vehicle propulsion technology, in particular to a piston-type gel oxidizer tank for fuel gas pressurization and an assembly method thereof. Background Art

[0002] Solid-liquid hybrid propulsion systems are widely used in the missile field because they have the advantages of adjustable thrust and repeatable start-up of liquid propulsion systems and simple structure, high reliability and stability, and easy long-term storage and maintenance of solid propellant systems.

[0003] With the increasingly stringent performance and safety requirements of missile equipment, the development directions of solid-liquid hybrid propulsion systems include:

[0004] (1) In order to meet the requirements of longer flight distance, longer flight time and more complex service conditions of missiles, the propulsion system needs to carry more propellant. Considering the working characteristics of missiles, their radial dimensions cannot be greatly increased, and thus can only be achieved by increasing their length.

[0005] (2) In order to meet the safety requirements of missile pre-packaging and long-term storage, gas pressurization is used in the propulsion system to replace traditional high-pressure cold gas pressurization to reduce the storage pressure; at the same time, gel oxidizer is used instead of liquid oxidizer to improve its storage safety.

[0006] (3) In order to meet the higher payload requirements of the missile, the propulsion system needs to be further reduced in weight.

[0007] In order to realize the development direction of the above-mentioned solid-liquid hybrid propulsion system, the traditional oxidizer tank solutions cannot meet all the above requirements. For example: metal diaphragm tanks cannot be applied to columns, especially slender columns, due to the working characteristics of the metal diaphragm; surface tension tanks cannot be used for the management of gel media due to the screen structure; non-metallic bladder tanks cannot meet the requirements due to oxidant compatibility and permeability issues. At present, only piston tanks have certain feasibility. However, in order to ensure the reliable operation of the piston, the current piston tanks generally have a short stroke and a large tank weight. Therefore, it is necessary to propose a gas-fired slender gel oxidizer tank suitable for gas boosting. Summary of the invention

[0008] In view of the defects in the prior art, the object of the present invention is to provide a piston type gel oxidant tank for fuel gas pressurization and an assembly method thereof.

[0009] According to the present invention, a piston-type gel oxidizer storage tank for gas boosting includes: a metal liner, a composite material winding layer, a gas line nozzle, a liquid line nozzle, a piston, a guide ring and a sealing ring, wherein the two ends of the metal liner are respectively connected to the gas line nozzle and the liquid line nozzle, the outer side of the metal liner is paved with a composite material winding layer, a piston is placed in the inner cavity of the metal liner, a guide ring and a sealing ring are sleeved on the piston, and the piston divides the inner cavity of the metal liner into a gas boosting chamber and an oxidizer storage chamber;

[0010] The piston slides back and forth on the inner wall of the metal liner through a guide ring, and the metal liner achieves isolation of the gas and liquid chambers under high pressure through the cooperation of the piston and the sealing ring; the inner chamber of the metal liner switches between the oxidant filling state and the oxidant supply state through the sliding of the piston; when in the oxidant filling state, the liquid line nozzle fills the gel oxidant into the oxidant storage chamber, and the gel oxidant pushes the piston to slide from the liquid end to the gas end to achieve oxidant filling; when in the oxidant supply state, the gas line nozzle fills the high-pressure gas into the gas boosting chamber, and the high-pressure gas pushes the piston to slide from the gas end to the liquid end to achieve oxidant supply.

[0011] Preferably, the metal liner comprises a cylindrical section, a gas end seal, a liquid end seal and a support ring, one end of the cylindrical section is connected to the gas end seal, the other end of the cylindrical section is connected to the liquid end seal, and the support ring is located on the inner wall of the cylindrical section and is an interference fit;

[0012] The ratio of the length to the inner diameter of the cylindrical section is 3-10, the gas end head and the liquid end head are hemispherical or ellipsoidal, and the wall thickness of the support ring is 2-3 times the wall thickness of the cylindrical section.

[0013] Preferably, the inner surface of the gas end cover is coated with a heat insulation layer, and the inner wall of the gas end cover is provided with metal fins with high thermal conductivity.

[0014] Preferably, the piston comprises a cylinder body, a support plate, a limiting ring and a flexible inner core, the support plate, the limiting ring and the flexible inner core are sequentially connected to the inner wall of the cylinder body, and the limiting ring is limitedly connected to the support plate;

[0015] The cylinder body includes a head and a straight body. The head is connected to the top of the straight body. The outer surface of the head is consistent with the inner surface of the liquid end head. The head is provided with multiple guide grooves, and the outer wall of the straight body is provided with multiple grooves, which match the guide ring and the sealing ring respectively.

[0016] Preferably, the support plate is connected to the inner wall of the head, and the support plate is a multi-spoke insert structure, and the shape of the support plate is consistent with the inner surface of the head.

[0017] Preferably, the limiting ring is fixedly connected to the inner wall of the cylinder body through a full circle of threads or screws, and the limiting ring is located between the head and the straight cylinder body.

[0018] Preferably, the flexible inner core is made of a foam or rubber material with resilience, and the flexible inner core is nested in the inner cavity of the straight barrel.

[0019] Preferably, the composite material winding layer includes a spiral winding layer and a hoop-wound reinforcement ring, the hoop-wound reinforcement ring is uniformly wrapped around the outer wall of the spiral winding layer, and the inner wall of the spiral winding layer is connected to the metal liner.

[0020] Preferably, the guide rings and the sealing rings are evenly spaced along the straight body, the guide rings are made of tetrafluoroethylene with a "T"-shaped cross section, and the sealing rings are made of perfluoroether rubber with an "O"-shaped or "U"-shaped cross section.

[0021] The present invention also provides a method for assembling a piston-type gel oxidant tank for fuel gas pressurization, comprising the following steps:

[0022] S1: Assemble the cylindrical section, the gas end cap and the support ring and perform high-energy beam welding to form an assembly 1;

[0023] S2: Assemble the assembly 1 and the gas line nozzle and perform high-energy beam welding to form the assembly 2;

[0024] S3: Install the support plate into the inner cavity of the head and ensure that the two are completely fitted, then fix the limit ring to the cylinder body through threads or screws, and finally embed the flexible inner core into the inner cavity of the straight body to form a piston;

[0025] S4: Assemble the guide ring into the corresponding groove of the piston by thermal expansion, and then assemble the sealing ring into the corresponding groove of the piston to form assembly three;

[0026] S5: Assemble the liquid end cover and the liquid line nozzle and perform high energy beam welding to form assembly 4;

[0027] S6: inserting the assembly three into the inner cavity of the assembly two, and then assembling the assembly two, the assembly four and the support ring and performing high-energy beam welding to form the assembly five;

[0028] S7: The spiral winding layer and the circumferential winding reinforcement ring are laid on the five outer surfaces of the assembly in sequence, and then cured and self-tightened to finally form a storage tank.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention achieves a significant reduction in tank weight by adopting a metal liner + composite material winding layer structure to replace the existing similar tank metal shell structure;

[0031] (2) The present invention effectively reduces the temperature of high-pressure gas near the gas line nozzle of the tank by coating a heat-insulating layer inside the gas end cover of the tank and arranging a metal fin with high thermal conductivity, and then combines the application of high-temperature resin in the composite material winding layer, thereby avoiding the failure of the tank shell under high-temperature gas;

[0032] (3) The present invention effectively controls the radial deformation of the tank during internal pressure and welding by providing a circumferentially wound reinforcement ring and a support ring, and then realizes adaptive adjustment of the radial size of the piston by nesting the flexible inner core, thereby finally realizing effective sealing of the piston during working process;

[0033] (4) The present invention provides a partition plate in the inner cavity of the piston cylinder body and a guide groove on the outer surface, thereby achieving a significant weight reduction of the piston base wall thickness while meeting the instability requirement; and provides a guide ring to effectively avoid the risk of the piston getting stuck in an ultra-long stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 for Figure 1 A-direction top view;

[0037] Figure 3 for Figure 1 Middle I is a partial enlarged view;

[0038] Figure 4 for Figure 1 Partial enlargement of II.

[0039] The figure shows:

[0040] Metal lining 1 Spiral winding layer 21 Support plate 52

[0041] Cylindrical segment 11 Circumferentially wound reinforcement ring 22 Limiting ring 53

[0042] Gas end cap 12 Gas line nozzle 3 Flexible inner core 54

[0043] Insulation layer 121 Liquid line nozzle 4 Guide ring 6

[0044] Metal fin 122 Piston 5 Sealing ring 7

[0045] Liquid end head 13 Cylinder body 51 Gas boost chamber 8

[0046] Support ring 14 Head 511 Oxidant storage chamber 9

[0047] Composite material winding layer 2 straight body 512 DETAILED DESCRIPTION

[0048] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0049] Example 1

[0050] According to the present invention, a piston-type gel oxidant storage tank for fuel gas pressurization is provided, such as Figure 1-3 As shown, it includes: a metal liner 1, a composite material winding layer 2, a gas line nozzle 3, a liquid line nozzle 4, a piston 5, a guide ring 6 and a sealing ring 7. The two ends of the metal liner 1 are connected to the gas line nozzle 3 and the liquid line nozzle 4 respectively. The composite material winding layer 2 is laid on the outside of the metal liner 1. The piston 5 is placed in the inner cavity of the metal liner 1. The guide ring 6 and the sealing ring 7 are sleeved on the piston 5. The piston 5 slides back and forth on the inner wall of the metal liner 1 through the guide ring 6. The flexible inner core 54 of the piston 5 and the sealing ring 7 cooperate to achieve isolation of the gas and liquid cavities under high pressure. The piston 5 divides the inner cavity of the metal liner 1 into a gas booster cavity 8 and an oxidant storage cavity 9.

[0051] The metal liner 1 is composed of a cylindrical section 11, a gas end seal 12, a liquid end seal 13 and a support ring 14 connected by high-energy beam welding. One end of the cylindrical section 11 is connected to the gas end seal 12, and the other end of the cylindrical section 11 is connected to the liquid end seal 13. The support ring 14 is located on the inner wall of the cylindrical section 11, and the support ring 14 is connected to the inner wall of the gas end seal 12. Among them, the cylindrical section 11 is a slender column with a relatively large length / inner diameter (usually 3-10), and the gas end seal 12 and the liquid end seal 13 adopt a hemispherical or ellipsoidal structure. In order to achieve weight reduction, the wall thickness of the above three is determined by the manufacturing process and is usually as thin as possible (0.5-2mm); considering that the piston 5 needs to be assembled to the inner cavity of the metal liner 1, the metal liner 1 can only adopt a welded structure. Since the metal liner 1 has a relatively thin wall, in order to avoid large radial deformation caused by welding, which may lead to piston sticking or seal failure, a support ring 14 with a wall thickness 2 to 3 times the thickness of the cylindrical section is provided to have an interference fit with the cylindrical section 11 to provide sufficient rigidity to resist welding deformation.

[0052] Since the pressurized gas is a high-temperature fuel gas, the temperature of the position near the gas line nozzle 3 of the tank is relatively high, and the tank shell may fail at this temperature. Therefore, a heat insulation layer 121 is coated on the inner surface of the gas end head 12, and a metal fin 122 with high thermal conductivity is provided on the inner wall of the gas end head 12 to quickly assist in heat dissipation. Since the fuel gas boosting chamber 8 is relatively large, when the high-pressure fuel gas is dispersed in the chamber, the temperature will quickly decrease, so the temperature of the piston 5 and the cylindrical section 11 area is relatively low, and there is no need to coat the heat insulation layer 121 and set the metal fin 122.

[0053] The composite winding layer 2 is composed of a spiral winding layer 21 and a hoop winding reinforcement ring 22. The hoop winding reinforcement ring 22 is evenly wrapped around the outer wall of the spiral winding layer 21, and the inner wall of the spiral winding layer 21 is connected to the metal liner 1. Considering that the temperature near the gas line nozzle 3 of the tank is relatively high, carbon fiber and high-temperature resin are selected as the materials of the composite winding layer 2; the spiral winding layer 21 should meet the bursting pressure requirements of the tank, and the thickness and width of the hoop winding reinforcement ring 22 should meet the requirements that the pressure deformation of the tank is not more than 2% and the residual deformation is not more than 0.5%.

[0054] The piston 5 includes a cylinder body 51, a support plate 52, a limiting ring 53 and a flexible inner core 54. The support plate 52, the limiting ring 53 and the flexible inner core 54 are connected to the inner wall of the cylinder body 51 in sequence, and the limiting ring 53 is connected to the support plate 52 in a limiting manner. The support plate 52 is a multi-spoke insert structure, which provides rigid support for the head 511 of the cylinder body 51 under the tank filling pressure and the saturated vapor pressure of the oxidant. The shape of the insert is consistent with the inner profile of the head 511, and its thickness and number are determined by rigidity calculation. The limiting ring 53 is connected and fixed to the cylinder body 51 through a full circle of threads or screws to limit the support plate 52. The flexible inner core 54 is made of a foam material or rubber material with a certain resilience. It is nested in the inner cavity of the straight body 512 of the cylinder body 51 and can compensate for the radial deformation of the metal liner 1 during operation.

[0055] The cylinder body 51 includes a head 511 and a straight body 512. The top of the straight body 512 is connected to the head 511. The head 511 is provided with a plurality of guide grooves. The outer wall of the straight body 512 is provided with a plurality of grooves, which are matched with the guide ring 6 and the sealing ring 7 respectively. In order to improve the discharge efficiency of the tank, the outer surface of the head 511 is consistent with the inner surface of the liquid end head 13 in the metal liner 1; at the same time, before the tank is filled with propellant, the outer surface of the head 511 is in contact with the inner surface of the liquid end head 13. At this time, the pressure of the gel propellant added is relatively large due to the small cross-section of the liquid path nozzle 4. In order to avoid instability of the head 511, a certain number and width of guide grooves are provided on its outer surface to quickly guide the propellant to a larger space, thereby reducing the filling pressure. In order to fix and assemble the guide ring 6 and the sealing ring 7, corresponding grooves are provided on the straight body 512; in addition, in order to prevent the cylinder body 51 from tilting and getting stuck during the sliding process, the length of the bamboo body 512 is set to be 1.5 to 3 times the height of the head 511. The basic wall thickness of the cylinder body 51 is determined by the discharge pressure difference of the tank, and it is required that the structure does not suffer from damage under this pressure.

[0056] The guide ring 6 has a "T"-shaped cross section, and is made of tetrafluoroethylene with a relatively smooth surface; its function is to provide a guide for the sliding of the piston 5 to prevent the piston 5 from getting stuck. The seal ring 7 has an "O"-shaped or "U"-shaped cross section, and is made of perfluoroether rubber that is first-level compatible with the gel oxidant and resistant to high temperatures. The number of guide rings 6 and seal rings 7 are both 2 to 3, and they are evenly spaced along the straight body 512.

[0057] Working principle: The tank has two working states: oxidant filling and oxidant supply. When the tank is in the oxidant filling state, the external gel oxidant is filled into the oxidant storage chamber 9 through the liquid nozzle 4, and at the same time, the piston 5 is pushed to slide from the liquid end to the gas end until the oxidant filling is completed; when the tank is in the oxidant supply state, the high-pressure gas enters the gas boosting chamber 8 through the gas nozzle 3, and at the same time, the piston 5 is pushed to slide from the gas end to the liquid end, thereby liquefying the gel propellant in the oxidant storage chamber 9 and discharging it from the liquid outlet 4 to realize the oxidant supply.

[0058] Example 2

[0059] This embodiment 2 is completed on the basis of embodiment 1, specifically:

[0060] like Figure 1As shown, a piston-type gel oxidizer storage tank for gas boosting includes a metal liner 1, a composite material winding layer 2, a gas line nozzle 3, a liquid line nozzle 4, a piston 5, a guide ring 6 and a sealing ring 7; the metal liner 1 is connected by high-energy beam welding of a cylindrical section 11, a gas end cap 12, a liquid end cap 13 and a support ring 14, and preferably, the high-energy beam welding method of the metal liner 1 is electron beam welding. The two ends of the metal liner 1 are respectively connected to the gas line nozzle 3 and the liquid line nozzle 4 by high-energy beam welding, and a composite material winding layer is laid on the outside, and a piston 5 is placed in the inner cavity. The piston 5 divides the inner cavity of the metal liner 1 into a gas boosting chamber 8 and an oxidizer storage chamber 9; the piston 5 realizes reliable reciprocating sliding through the guide ring 6, and realizes effective isolation of the gas and liquid chambers under high pressure through the flexible expansion inner core 54 and the sealing ring 7.

[0061] The metal lining 1 is made of aluminum alloy material that is first-level compatible with the gel oxidant. The length / inner diameter ratio of the cylindrical section 11 is 5 and the wall thickness is 1.5 mm. The gas end head 12 and the liquid end head 13 are ellipsoidal with a wall thickness of 1 mm. The outer surface of the support ring 14 is interference fit with the inner surface of the cylindrical section 11, and the wall thickness is twice the wall thickness of the cylindrical section 11; the inner surface of the gas end head 12 is coated with a thermal insulation layer 121, and a metal fin 122 with high thermal conductivity is provided.

[0062] The composite winding layer 2 is composed of a spiral winding layer 21 and a hoop-wound reinforcement ring 22; the composite winding layer 2 is composed of T700 carbon fiber and high-temperature resin. The thickness of the pressure-bearing spiral winding layer 21 is calculated to be 2 mm according to the requirements of the tank bursting pressure; the thickness of the hoop-wound reinforcement ring 22 is calculated to be 6 mm and the width is 10 mm according to the requirements that the tank pressure deformation is not more than 2% and the residual deformation is not more than 0.5%.

[0063] The piston 5 is composed of a cylinder body 51, a support plate 52, a stop ring 53 and a flexible inner core 54; the cylinder body 51 of the piston 5 is composed of a straight body 512 and a head 511, the outer profile of the head 511 is consistent with the inner profile of the liquid end seal 13, and four guide grooves with a width of 10 mm are provided; the straight body 512 is provided with grooves for assembling two guide rings 6 and two sealing rings 7. The length of the straight body 512 is set to 1.5 times the height of the head 511, and the basic wall thickness of the cylinder body 51 is calculated to be 1 mm according to the requirements of the discharge pressure difference of the storage tank;

[0064] The support plate 52 of the piston 5 is a multi-spoke insert structure, the shape of the insert is consistent with the inner profile of the head, and the wall thickness is calculated to be 3 mm according to the initial pressure of the tank filling and the saturated vapor pressure of the oxidant, and the number is 4. The stop ring 53 of the piston 5 is connected and fixed to the cylinder body 51 through a full circle of threads; the flexible inner core 54 of the piston 5 is made of a foam material with a certain resilience, and is embedded in the inner cavity of the straight body of the cylinder body 51.

[0065] The guide ring 6 has a "T"-shaped cross section, and is made of tetrafluoroethylene with a relatively smooth surface; the sealing ring 7 has an "O"-shaped cross section, and is made of perfluoroether rubber that is first-level compatible with the gel oxidant and resistant to high temperatures; the guide ring 6 and the sealing ring 7 are both provided in two numbers, which are evenly spaced along the straight barrel 512.

[0066] Example 3

[0067] This embodiment 3 is a variation of embodiment 2, specifically:

[0068] The high energy beam welding method of the metal liner 1 is laser welding. The material of the metal liner 1 is a stainless steel material that is first-level compatible with the gel oxidant. Among them, the gas end seal 12 and the liquid end seal 13 are hemispherical.

[0069] The composite material winding layer 2 is composed of glass fiber and high temperature resin.

[0070] The limiting ring 53 of the piston 5 is connected and fixed to the cylinder body 51 by screws; the flexible inner core 54 of the piston 5 is made of a rubber material with a certain resilience; and the cross section of the sealing ring 7 is "U"-shaped.

[0071] Example 4

[0072] The present invention also provides a method for assembling the piston-type gel oxidant tank for fuel gas pressurization in Example 1, comprising the following steps:

[0073] S1: Assemble the cylindrical section 11, the gas end cover 12 and the support ring 14 and perform high-energy beam welding to form an assembly 1;

[0074] S2: Assemble the assembly 1 and the gas line nozzle 3 and perform high-energy beam welding to form the assembly 2;

[0075] S3: Install the support plate 52 into the inner cavity of the head 511 and ensure that the two are completely fitted, then fix the limiting ring 53 to the cylinder body 51 through threads or screws to limit and fix the support plate 52, and finally embed the flexible inner core 54 into the inner cavity of the straight body 512 to form the piston 5;

[0076] S4: Assemble the guide ring 6 into the corresponding groove of the piston 5 by thermal expansion, and then assemble the sealing ring 7 into the corresponding groove of the piston 5 to form a third assembly;

[0077] S5: Assemble the liquid end seal 13 and the liquid channel nozzle 4 and perform high energy beam welding to form a fourth assembly;

[0078] S6: inserting the assembly three into the inner cavity of the assembly two, and then assembling the assembly two, the assembly four and the support ring 14 and performing high-energy beam welding to form the assembly five;

[0079] S7: The spiral winding layer 21 and the circumferential winding reinforcement ring 22 are laid on the outer surface of the assembly in sequence, and then cured and tightened to finally form a storage tank.

[0080] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A piston type gel oxidant tank for gas pressurization, characterized in that: include: A metal liner (1), a composite material winding layer (2), a gas line nozzle (3), a liquid line nozzle (4), a piston (5), a guide ring (6) and a sealing ring (7), wherein the two ends of the metal liner (1) are respectively connected to the gas line nozzle (3) and the liquid line nozzle (4), the composite material winding layer (2) is laid on the outside of the metal liner (1), the piston (5) is placed in the inner cavity of the metal liner (1), the guide ring (6) and the sealing ring (7) are sleeved on the piston (5), and the piston (5) divides the inner cavity of the metal liner (1) into a fuel gas boost chamber (8) and an oxidant storage chamber (9); The piston (5) slides back and forth on the inner wall of the metal liner (1) through the guide ring (6), and the metal liner (1) achieves isolation of the gas and liquid chambers under high pressure through the cooperation of the piston (5) and the sealing ring (7); the inner chamber of the metal liner (1) switches between an oxidant filling state and an oxidant supply state through the sliding of the piston (5); when in the oxidant filling state, the liquid line nozzle (4) fills the gel oxidant into the oxidant storage chamber (9), and the gel oxidant pushes the piston (5) to slide from the liquid end to the gas end to achieve oxidant filling; when in the oxidant supply state, the gas line nozzle (3) fills the high-pressure gas into the gas boosting chamber (8), and the high-pressure gas pushes the piston (5) to slide from the gas end to the liquid end to achieve oxidant supply.

2. The piston type gel oxidant tank for fuel gas pressurization according to claim 1, characterized in that: The metal liner (1) comprises a cylindrical section (11), a gas end seal (12), a liquid end seal (13) and a support ring (14); one end of the cylindrical section (11) is connected to the gas end seal (12), the other end of the cylindrical section (11) is connected to the liquid end seal (13); the support ring (14) is located on the inner wall of the cylindrical section (11) and is an interference fit; The length / inner diameter ratio of the cylindrical section (11) is 3-10, the gas end seal (12) and the liquid end seal (13) are hemispherical or ellipsoidal, and the wall thickness of the support ring (14) is 2-3 times the wall thickness of the cylindrical section (11).

3. The piston type gel oxidant tank for fuel gas pressurization according to claim 2, characterized in that: The inner surface of the gas end seal (12) is coated with a heat insulation layer (121), and the inner wall of the gas end seal (12) is provided with metal fins (122) with high thermal conductivity.

4. The piston type gel oxidant tank for fuel gas pressurization according to claim 1, characterized in that: The piston (5) comprises a cylinder body (51), a support plate (52), a limiting ring (53) and a flexible inner core (54); the support plate (52), the limiting ring (53) and the flexible inner core (54) are sequentially connected to the inner wall of the cylinder body (51), and the limiting ring (53) is limitatively connected to the support plate (52); The cylinder body (51) comprises a head (511) and a straight body (512); the top end of the straight body (512) is connected to the head (511); the outer profile of the head (511) is consistent with the inner profile of the liquid end sealing head (13); the head (511) is provided with a plurality of guide grooves; the outer wall of the straight body (512) is provided with a plurality of grooves; the grooves are matched with the guide ring (6) and the sealing ring (7) respectively.

5. The piston type gel oxidant tank for fuel gas pressurization according to claim 4, characterized in that: The support plate (52) is connected to the inner wall of the head (511), and the support plate (52) is a multi-spoke insert structure. The shape of the support plate (52) is consistent with the inner profile of the head (511).

6. The piston type gel oxidant tank for fuel gas pressurization according to claim 4, characterized in that: The limiting ring (53) is fixedly connected to the inner wall of the cylinder body (51) through a full circle of threads or screws, and the limiting ring (53) is located between the head (511) and the straight body (512).

7. The piston type gel oxidant tank for fuel gas pressurization according to claim 4, characterized in that: The flexible inner core (54) is made of a foam or rubber material with resilience, and the flexible inner core (54) is nested in the inner cavity of the straight barrel body (512).

8. The piston type gel oxidant tank for fuel gas pressurization according to claim 1, characterized in that: The composite material winding layer (2) comprises a spiral winding layer (21) and a hoop-wound reinforcement ring (22), wherein the hoop-wound reinforcement ring (22) is uniformly wound around the outer wall of the spiral winding layer (21), and the inner wall of the spiral winding layer (21) is connected to the metal liner (1).

9. The piston type gel oxidant tank for fuel gas pressurization according to claim 1, characterized in that: The guide ring (6) and the sealing ring (7) are evenly spaced along the straight body (512); the guide ring (6) is made of tetrafluoroethylene with a "T"-shaped cross section, and the sealing ring (7) is made of perfluoroether rubber with an "O"-shaped or "U"-shaped cross section.

10. A method for assembling a piston-type gel oxidant tank for gas pressurization according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Assembling the cylindrical section (11), the gas end cover (12) and the support ring (14) and performing high-energy beam welding to form an assembly 1; S2: Assembling the assembly 1 and the gas path nozzle (3) and performing high-energy beam welding to form an assembly 2; S3: insert the support plate (52) into the inner cavity of the head (511) and ensure that the two are completely fitted together, then fix the limit ring (53) to the cylinder body (51) through threads or screws, and finally embed the flexible inner core (54) into the inner cavity of the straight body (512) to form the piston (5); S4: assembling the guide ring (6) into the corresponding groove of the piston (5) by means of thermal expansion, and assembling the sealing ring (7) into the corresponding groove of the piston (5) to form a third assembly; S5: Assembling the liquid end sealing head (13) and the liquid path nozzle (4) and performing high energy beam welding to form a fourth assembly; S6: inserting the assembly three into the inner cavity of the assembly two, and then assembling the assembly two, the assembly four and the support ring (14) and performing high-energy beam welding to form the assembly five; S7: The spiral winding layer (21) and the annular winding reinforcement ring (22) are sequentially laid on the five outer surfaces of the assembly, and then cured and tightened to finally form the tank.

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