1. The high-pressure composite gas cylinder with the inner sealing structure is characterized by comprising an aluminum alloy inner container (1), a carbon fiber composite layer (2) arranged on the outer wall of the aluminum alloy inner container (1), and a glass fiber composite layer (3) arranged on the outer wall of the carbon fiber composite layer (2) and playing a role in protection; the head end of the aluminum alloy inner container (1) is provided with a high-strength inner container bottle mouth (5), and a gas bottle valve (4) is hermetically connected in the high-strength inner container bottle mouth (5).

2. The high-pressure composite gas cylinder with the inner sealing structure according to claim 1, wherein the high-strength liner bottle mouth (5) comprises a disk-shaped bottle mouth body (51) smoothly connected to the head end of the aluminum alloy liner (1), a sealing inner hole (52) matched with the gas cylinder valve (4) is formed in the center of the bottle mouth body (51), and the gas cylinder valve (4) is sleeved in the sealing inner hole (52).

3. The high-pressure composite gas cylinder with the inner sealing structure according to claim 2, characterized in that the outer diameter of the cylinder mouth body (51) is 120mm, the thickness of the cylinder mouth body (51) is 25mm, and the inner diameter of the sealing inner hole (52) is 33 mm.

4. The high-pressure composite gas cylinder with the inner sealing structure according to claim 2, characterized in that a cylinder mouth convex ring (53) communicated with the sealing inner hole (52) extends smoothly outwards from the outer side of the cylinder mouth body (51), and the gas cylinder valve (4) is connected into the cylinder mouth convex ring (53) in a threaded manner.

5. The high-pressure composite gas cylinder with an inner sealing structure according to claim 4, characterized in that the outer diameter of the nose convex ring (53) is 60 mm.

6. The high-pressure composite gas cylinder with the inner sealing structure according to claim 2, characterized in that a gap (7) is reserved between the gas cylinder valve (4) and the inner wall of the sealing inner hole (52).

7. The high-pressure composite gas cylinder with the inner sealing structure according to claim 2, characterized in that the gas cylinder valve (4) is sleeved with an O-shaped sealing ring (6), and the O-shaped sealing ring (6) is positioned in the sealing inner hole (52).

8. The high-pressure composite gas cylinder with the inner sealing structure according to claim 1, wherein the carbon fiber composite layer (2) is formed by impregnating high-strength carbon fibers with epoxy resin, winding the carbon fiber composite layer on the outer surface of the aluminum alloy inner container (1) and heating and curing the carbon fiber composite layer.

9. The high-pressure composite gas cylinder with the inner sealing structure according to claim 1, characterized in that the carbon fiber composite layer (2) has an internal pressure resistance of 200 MPa.

10. The high-pressure composite gas cylinder with the inner sealing structure according to claim 1, characterized in that a tail plug (8) is arranged at the tail end of the aluminum alloy liner (1), and the tail plug (8) is used for supporting, clamping and tightening the aluminum alloy liner (1) in the production process of the high-pressure composite gas cylinder.

Background

With the increasing of automobiles using petrochemical energy as fuel, the petrochemical energy is consumed in a large amount, and simultaneously, a large amount of greenhouse gases are discharged, which affects the living environment of human beings, so that in recent years, various countries in the world explore clean energy for automobiles, wherein a hydrogen fuel cell vehicle can effectively realize the removal of the petrochemical energy, and the stored hydrogen is converted into electric energy through a galvanic pile to drive the automobiles to run. The hydrogen storage mode popularized in the market at present adopts a high-pressure hydrogen storage bottle to store hydrogen, namely, hydrogen is compressed into the hydrogen storage bottle to a high-pressure state. Traditional high-pressure composite gas cylinder, not only the structure is complicated leads to manufacturing cost high, and the preparation process is still loaded down with trivial details simultaneously, and production efficiency is low.

Therefore, the high-pressure compound gas cylinder with the inner sealing structure is designed to solve at least some technical problems.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the high-pressure composite gas cylinder with the inner sealing structure is provided to at least solve part of technical problems.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a high-pressure composite gas cylinder with an inner sealing structure comprises an aluminum alloy inner container, a carbon fiber composite layer arranged on the outer wall of the aluminum alloy inner container, and a glass fiber composite layer arranged on the outer wall of the carbon fiber composite layer and playing a role in protection; the head end of the aluminum alloy inner container is provided with a high-strength inner container bottle mouth, and a gas bottle valve is hermetically connected in the high-strength inner container bottle mouth.

Further, high strength inner bag bottle neck includes smooth-going connection in aluminum alloy inner bag head end and be discoid bottle neck body, and bottle neck body central authorities offer the sealed hole with gas cylinder valve looks adaptation, and gas cylinder valve suit is in sealed hole.

Further, the external diameter of the bottle mouth body is 120mm, the thickness of the bottle mouth body is 25mm, and the internal diameter of the sealing inner hole is 33 mm.

Furthermore, the bottle mouth convex ring communicated with the sealing inner hole is smoothly extended outwards from the outer side of the bottle mouth body, and the gas bottle valve is connected in the bottle mouth convex ring in a threaded mode.

Further, the external diameter of the bottle mouth convex ring is 60 mm.

Furthermore, a gap is reserved between the gas cylinder valve and the inner wall of the sealing inner hole.

Furthermore, an O-shaped sealing ring is sleeved on the gas cylinder valve and is positioned in the sealing inner hole.

Furthermore, the carbon fiber composite layer is formed by impregnating high-strength carbon fibers with epoxy resin, then winding the carbon fibers on the outer surface of the aluminum alloy inner container, and heating and curing the carbon fibers.

Further, the carbon fiber composite layer has an internal pressure resistance of 200 MPa.

Furthermore, the tail end of the aluminum alloy inner container is provided with a tail plug, and the tail plug is used for supporting, clamping and tightening the aluminum alloy inner container in the production process of the high-pressure composite gas cylinder.

Compared with the prior art, the invention has the following beneficial effects:

the high-pressure composite gas cylinder has the advantages of simple structure, scientific and reasonable design and convenient use, can meet the assembly requirement of the gas cylinder valve by depending on the strength and the rigidity of the cylinder body in the high-strength liner cylinder mouth on the aluminum alloy liner, can effectively simplify the structure of the high-pressure composite gas cylinder, reduces the manufacturing procedures and materials of the high-pressure composite gas cylinder, reduces the manufacturing cost of the high-pressure composite gas cylinder and improves the production efficiency of the high-pressure composite gas cylinder.

The high-pressure composite gas cylinder mainly comprises an aluminum alloy inner container, a carbon fiber composite layer, a glass fiber composite layer, a gas cylinder valve and a tail plug, wherein the aluminum alloy inner container is used as a sealing part and an internal pressure transmission part of the high-pressure composite gas cylinder, and high-pressure gas (such as hydrogen, but not limited to hydrogen) can be sealed by a compact aluminum alloy material and cannot escape through a metal material; meanwhile, the inner container can transmit the internal pressure to the outer high-strength carbon fiber composite layer after elastic expansion under high pressure, so that the gas cylinder can bear high internal pressure; in addition, the aluminum alloy inner container can also serve as an inner mold, and the outer surface of the aluminum alloy inner container can be completely wound after the carbon fiber is impregnated with resin. The carbon fiber composite layer is a gas cylinder pressure bearing layer, is formed by winding the high-strength carbon fiber impregnated epoxy resin on the outer surface of the aluminum alloy liner and then thermally curing the high-strength carbon fiber impregnated epoxy resin, so that the internal pressure strength of the high-pressure composite gas cylinder can exceed 200 MPa. The glass fiber composite bed is the gas cylinder protective layer, mainly protects the carbon fiber composite bed, guarantees that the carbon fiber composite bed can not damage when running into the situation such as accidental slight colliding with in installation transportation and use, and the glass fiber composite bed does not bear interior pressure. The tail plug is used for assisting the production process of a T-shaped structure gas cylinder (refer to GB/T35544 and 2017), is connected with a tool, and is used for supporting, clamping and tightening an aluminum alloy inner container to assist the production process. The gas cylinder valve is in threaded connection with a bottle mouth convex ring of a bottle mouth of the high-strength inner container in the aluminum alloy inner container, and an O-shaped sealing ring positioned at the front end of the gas cylinder valve is matched with an inner sealing surface of a sealing inner hole to hermetically seal high pressure inside the gas cylinder.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is an enlarged view of the bottle mouth of the high-strength liner of the invention (equipped with a gas bottle valve).

Fig. 3 is an enlarged view of the mouth of the high-strength liner (not equipped with the gas cylinder valve).

Fig. 4 is a schematic view of the mouth of the high-strength liner of the present invention.

Fig. 5 is an enlarged view of the O-ring of the present invention.

Fig. 6 is an enlarged view of the invention at the tail plug.

Wherein, the names corresponding to the reference numbers are:

the bottle neck comprises a 1-aluminum alloy inner container, a 2-carbon fiber composite layer, a 3-glass fiber composite layer, a 4-gas bottle valve, a 5-high-strength inner container bottle neck, a 6-O-shaped sealing ring, a 7-gap, an 8-tail plug, a 51-bottle neck body, a 52-sealing inner hole and a 53-bottle neck convex ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-6, the high-pressure composite gas cylinder with an inner sealing structure provided by the invention comprises an aluminum alloy inner container 1, a carbon fiber composite layer 2 arranged on the outer wall of the aluminum alloy inner container 1, and a glass fiber composite layer 3 arranged on the outer wall of the carbon fiber composite layer 2 and having a protection effect; the head end of the aluminum alloy inner container 1 is provided with a high-strength inner container bottle mouth 5, and a gas bottle valve 4 is hermetically connected in the high-strength inner container bottle mouth 5. The carbon fiber composite layer 2 is formed by impregnating high-strength carbon fibers with epoxy resin, then winding the carbon fibers on the outer surface of the aluminum alloy inner container 1, and heating and curing the carbon fibers. The internal pressure resistance strength of the carbon fiber composite layer 2 is 200 MPa.

The high-pressure composite gas cylinder has the advantages of simple structure, scientific and reasonable design and convenient use, can meet the assembly requirement of the gas cylinder valve by depending on the strength and the rigidity of the cylinder body in the high-strength liner cylinder mouth on the aluminum alloy liner, can effectively simplify the structure of the high-pressure composite gas cylinder, reduces the manufacturing procedures and materials of the high-pressure composite gas cylinder, reduces the manufacturing cost of the high-pressure composite gas cylinder and improves the production efficiency of the high-pressure composite gas cylinder.

The high-strength liner bottle mouth 5 comprises a bottle mouth body 51 which is smoothly connected with the head end of an aluminum alloy liner 1 and is disc-shaped, a sealing inner hole 52 matched with a gas bottle valve 4 is formed in the center of the bottle mouth body 51, and the gas bottle valve 4 is sleeved in the sealing inner hole 52. The outer diameter of the bottle mouth body 51 is 120mm, the thickness of the bottle mouth body 51 is 25mm, and the inner diameter of the sealing inner hole 52 is 33 mm.

According to the invention, the bottle mouth body 51 in the high-strength liner bottle mouth 5 is disc-shaped, the outer diameter of the bottle mouth body is 120mm, the thickness of the bottle mouth body is 25mm, and the inner diameter of the sealing inner hole 52 is 33 mm.

The bottle mouth convex ring 53 communicated with the sealing inner hole 52 extends outwards and smoothly outside the bottle mouth body 51, and the gas cylinder valve 4 is connected in the bottle mouth convex ring 53 in a threaded mode. The outer diameter of the bottle mouth convex ring 53 is 60mm, and the inner diameter of the bottle mouth convex ring 53 is 33 mm. So design can effectively guarantee that gas cylinder valve 4 firmly installs on aluminum alloy inner bag 1. Meanwhile, the outer diameter of the bottle mouth convex ring 53 with the outer diameter of 60mm is closer to that of the tail plug 8, so that a winding polar hole of the bottle mouth is smaller, the difference between the winding polar hole of the bottle mouth and the winding polar hole of the tail plug is smaller, the winding process is more facilitated, and the fiber strength exertion rate is higher.

The invention has a gap 7 between the cylinder valve 4 and the inner wall of the sealing inner hole 52. The gas cylinder valve 4 is sleeved with an O-shaped sealing ring 6, and the O-shaped sealing ring 6 is positioned in the sealing inner hole 52. The high-pressure gas stored in the aluminum alloy liner compresses the O-shaped sealing ring between the sealing inner hole and the gas cylinder valve 4 through the gap 7 between the gas cylinder valve 4 and the inner wall of the sealing inner hole 52, so that the high-pressure gas in the aluminum alloy liner is prevented from passing through, and the sealing effect is realized.

When the pressure increases (for example the gas cylinder reaches 150MPa when self-tightening) and the gas cylinder is in fatigue in-process (rise the pressure many times repeatedly) in the gas cylinder, the internal diameter of the sealed hole of aluminum alloy inner bag can expand the increase, when sealed hole internal diameter increases to unable compression O type sealing washer, high-pressure gas will leak from the sealed department of O type sealing washer in the aluminum alloy inner bag, and the gas cylinder loses the storage gas function promptly. According to the design, the nozzle body 51 in the high-strength liner nozzle 5 is disc-shaped, the outer diameter of the nozzle body is 120mm, the thickness of the nozzle body is 25mm, and the inner diameter of the sealing inner hole 52 is 33mm, so that the high-strength liner nozzle 5 is high in internal pressure resistance, the requirement of the high-strength internal pressure of the sealing inner hole can be met after the cylinder valve 4 is directly assembled, a reinforcing structure is not required to be designed at the nozzle, the sealing surface in the sealing inner hole can be ensured to tightly compress an O-shaped sealing ring when the internal pressure of a high-pressure composite gas cylinder is increased (for example, the pressure of the gas cylinder reaches 150MPa when the gas cylinder is self-tightened) or the gas cylinder is in the fatigue process (repeatedly increasing and releasing pressure) so as to prevent high-pressure gas stored in an aluminum alloy liner, and ensure the function of the high-pressure composite gas cylinder for storing gas.

The tail end of the aluminum alloy liner 1 is provided with the tail plug 8, and the tail plug 8 is used for supporting, clamping and tightening the aluminum alloy liner 1 in the production process of the high-pressure composite gas cylinder. The invention is particularly suitable for the T-shaped structure gas cylinder (refer to GB/T35544-. The tail plug 8 of the invention is matched with the bottle mouth convex ring 53 with the outer diameter of 60mm, so that the outer diameter of the bottle mouth convex ring 53 is closer to the outer diameter of the tail plug 8, the winding polar hole of the bottle mouth is smaller, the difference with the winding polar hole of the tail plug is smaller, the winding process is more favorable, and the fiber strength exertion rate is higher.

The high-pressure composite gas cylinder mainly comprises an aluminum alloy inner container, a carbon fiber composite layer, a glass fiber composite layer, a gas cylinder valve and a tail plug, wherein the aluminum alloy inner container is used as a sealing part and an internal pressure transmission part of the high-pressure composite gas cylinder, and high-pressure gas (such as hydrogen, but not limited to hydrogen) can be sealed by a compact aluminum alloy material and cannot escape through a metal material; meanwhile, the inner container can transmit the internal pressure to the outer high-strength carbon fiber composite layer after elastic expansion under high pressure, so that the gas cylinder can bear high internal pressure; in addition, the aluminum alloy inner container can also serve as an inner mold, and the outer surface of the aluminum alloy inner container can be completely wound after the carbon fiber is impregnated with resin. The carbon fiber composite layer is a gas cylinder pressure bearing layer, is formed by winding the high-strength carbon fiber impregnated epoxy resin on the outer surface of the aluminum alloy liner and then thermally curing the high-strength carbon fiber impregnated epoxy resin, so that the internal pressure strength of the high-pressure composite gas cylinder can exceed 200 MPa. The glass fiber composite bed is the gas cylinder protective layer, mainly protects the carbon fiber composite bed, guarantees that the carbon fiber composite bed can not damage when running into the situation such as accidental slight colliding with in installation transportation and use, and the glass fiber composite bed does not bear interior pressure. The tail plug is used for assisting the production process of a T-shaped structure gas cylinder (refer to GB/T35544 and 2017), is connected with a tool, and is used for supporting, clamping and tightening an aluminum alloy inner container to assist the production process. The gas cylinder valve is in threaded connection with a bottle mouth convex ring of a bottle mouth of the high-strength inner container in the aluminum alloy inner container, and an O-shaped sealing ring positioned at the front end of the gas cylinder valve is matched with an inner sealing surface of a sealing inner hole to hermetically seal high pressure inside the gas cylinder.

The aluminum alloy liner is used as a sealing part and an internal pressure transmission part of the high-pressure gas cylinder, the dense aluminum alloy material can seal high-pressure gas (such as hydrogen, but not limited to hydrogen), and the gas cannot penetrate through a metal material; meanwhile, the aluminum alloy inner container generates elastic expansion under high pressure to transmit the internal pressure to the outer high-strength carbon fiber composite layer, so that the gas cylinder can bear high internal pressure; in addition, the aluminum alloy inner container also serves as an inner mold, and the carbon fiber is completely wound on the surface of the aluminum alloy inner container after being impregnated with resin.

The tail plug is used for assisting the production process of a T-shaped structure gas cylinder (refer to GB/T35544 and 2017), is connected with a tool, supports, clamps and tightens an aluminum alloy inner container, and assists the production process.

The carbon fiber composite layer is a pressure bearing layer of the gas cylinder, is formed by impregnating high-strength carbon fibers with epoxy resin, then winding the carbon fibers on the outer surface of an aluminum alloy liner, and then heating and curing the carbon fibers, and the internal pressure strength of the gas cylinder can exceed 200 MPa.

The glass fiber composite layer is a gas cylinder protective layer, and mainly protects the carbon fiber composite layer from damage caused by accidental slight collision in the installation, transportation and use processes, and the glass fiber composite layer is not designed to bear internal pressure.

The gas cylinder valve is in threaded connection with the aluminum alloy inner container, and the O-shaped sealing ring at the front end of the gas cylinder valve is matched with the inner sealing surface of the sealing inner hole of the aluminum alloy inner container to hermetically seal high pressure in the gas cylinder.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the invention.