Capillary hydrogen storage device and manufacturing method of capillary hydrogen storage unit thereof

Abstract

The application discloses a capillary hydrogen storage device and a manufacturing method of a capillary hydrogen storage unit thereof. The capillary hydrogen storage device comprises a capillary hydrogen storage unit, and the capillary hydrogen storage unit comprises a hydrogen storage unit support pipe, the upper end of the hydrogen storage unit support pipe is a hydrogen storage unit open end, the hydrogen storage unit open end is connected with a sealing valve, the lower end of the hydrogen storage unit support pipe is a hydrogen storage unit closed end, a plurality of primary composite pipes are arranged in the hydrogen storage unit support pipe, and capillary sub-pipes are arranged in the primary composite pipes and the gaps between the primary composite pipes and the hydrogen storage unit support pipe. The capillary hydrogen storage unit is wrapped by a shell and a buffer layer, the shell is made of a thin-wall metal and provides impact protection for the internal capillary hydrogen storage unit. The buffer layer is arranged between the shell and the capillary hydrogen storage unit, the buffer layer is made of relatively soft organic materials such as foam glue or epoxy resin, and the buffer layer can reduce the damage of external impact force to the internal capillary hydrogen storage unit. The capillary hydrogen storage device has the advantages of compact structure, light weight and high mechanical strength.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen storage, and particularly relates to a capillary hydrogen storage device and a manufacturing method of a capillary hydrogen storage unit thereof. BACKGROUND

[0002] Hydrogen energy is a recognized green energy, and its combustion product is only water, which is a low-carbon and zero-carbon energy. The hydrogen energy industry has become a key development direction of China's future industry. In addition, hydrogen has high energy density and is an ideal fuel for fuel cells. Hydrogen storage technology runs through the hydrogen energy end to the fuel cell end in the industry chain from production to utilization, and is an important link to control the cost of hydrogen.

[0003] In the prior art, high-pressure metal gas cylinders for storing conventional gases are difficult to be used for high-pressure storage of hydrogen due to the hydrogen embrittlement of metal. In order to solve the problem of hydrogen embrittlement of metal high-pressure gas cylinders, a glass capillary array is proposed to be used as a high-pressure hydrogen storage container. A micro-tube hydrogen storage device is disclosed in Chinese Patent Application No. CN202110756468.3, which proposes a micro-tube structure arranged in a regular hexagon, and uses a hexagonal glass tube as a support framework inside, forming a structure similar to a honeycomb, which enhances the overall structure of the micro-tube hydrogen storage device. However, conventional glass tubes on the market are cylindrical, and the processing of hexagonal glass tubes is complex, which inevitably leads to an increase in cost, and the hexagonal arrangement process is complex. In the process of drawing, uneven stress is also easy to cause misalignment of the hexagonal structure, forming a stress concentration in the micro-beam interior, which reduces the overall pressure resistance of the micro-tube beam. SUMMARY

[0004] In view of the above deficiencies in the prior art, one object of the present application is to provide a capillary hydrogen storage device which is compact, light, high in mechanical strength, and simple in manufacturing process and easy to obtain raw materials. Another object of the present application is to provide a manufacturing method of a capillary hydrogen storage unit in the capillary hydrogen storage device.

[0005] In order to achieve the above-mentioned objects, the technical solution adopted by the present application is as follows:

[0006] On the one hand, a capillary hydrogen storage device is provided, which comprises a capillary hydrogen storage unit, the capillary hydrogen storage unit comprising a hydrogen storage unit support tube, the upper end of the hydrogen storage unit support tube being a hydrogen storage unit open end, the hydrogen storage unit open end being connected with a packaging valve, the lower end of the hydrogen storage unit support tube being a hydrogen storage unit closed end, and the hydrogen storage unit support tube being provided with a plurality of primary composite tubes, and the primary composite tubes and the gaps between the primary composite tubes and the hydrogen storage unit support tube being provided with capillary sub-tubes.

[0007] Further, the hydrogen storage unit support tube, the primary composite tube and the capillary sub-tube are all glass cylindrical tubes.

[0008] Further, the hydrogen storage unit support tube is sleeved with a buffer layer made of organic material.

[0009] Further, the buffer layer is sleeved with a metal shell.

[0010] Further, a gas valve is arranged on the sealing valve.

[0011] Further, the diameter of the capillary hydrogen storage unit is 5-60mm, and the length is 100-2000mm.

[0012] Further, the thickness of the buffer layer is 1-20mm, and the thickness of the shell is 0.5-5mm.

[0013] In another aspect, a capillary hydrogen storage unit manufacturing method is provided, which comprises the following steps:

[0014] S1, the thin-walled glass tube is placed in a heating furnace, heated to a softened state and drawn into a capillary sub-tube;

[0015] S2, the capillary sub-tube is arranged in the thin-walled glass tube in a neat and orderly manner, and a primary composite rod is formed;

[0016] S3, the primary composite rod is placed in a heating furnace, heated to a softened state, and then drawn to form a primary composite tube;

[0017] S4, the primary composite tube is filled in the thin-walled glass tube, and the gap between the primary composite tube and the thin-walled glass tube is filled with capillary sub-tubes to form a secondary composite rod;

[0018] S5, the secondary composite rod is placed in a heating furnace, heated to a softened state, and then drawn and cut to form a hydrogen storage unit blank tube;

[0019] S6, one end of the hydrogen storage unit blank tube is heated by a high-temperature spray gun, melted, and self-sealed to form a water droplet-shaped sealing end, and the capillary hydrogen storage unit is completed.

[0020] Further, in steps S1, S2 and S4, the thin-walled glass tube is a circular glass tube made of borosilicate glass or quartz glass.

[0021] Further, in step S1, the diameter ratio of the thin-walled glass tube to the capillary sub-tube is greater than 10.

[0022] The beneficial effects of the present application are:

[0023] 1. The capillary hydrogen storage unit comprises a plurality of glass tubes bonded together through a high-temperature drawing process, and the internal capillary sub-tube and the primary composite tube are tightly wrapped by the outermost hydrogen storage unit support tube. The hydrogen storage unit support tube can enhance the ability of the capillary sub-tube and the primary composite tube to withstand hydrogen pressure, and increase the upper limit of the hydrogen pressure value that the capillary hydrogen storage unit can withstand.

[0024] 2. The primary composite tube gap and the primary composite tube and hydrogen storage unit support tube gap are filled with capillary sub-tubes, which can reduce stress concentration caused by deformation of the primary composite tube during drawing, and increase the hydrogen storage capacity of the capillary tube hydrogen storage unit.

[0025] 3. The primary composite tube and capillary sub-tube form a reticular structure that supports each other like plant cell walls inside the capillary tube hydrogen storage unit, which can improve the overall strength of the capillary tube hydrogen storage unit, and the capillary sub-tube is divided into different units, which can reduce damage to the capillary tube hydrogen storage unit caused by damage to part of the capillary sub-tube.

[0026] 4. The capillary tube hydrogen storage unit is wrapped by a shell and a buffer layer. The shell is made of thin-walled metal and provides impact protection for the internal capillary tube hydrogen storage unit. The buffer layer between the shell and the capillary tube hydrogen storage unit is a relatively soft organic material such as foam glue or epoxy resin, which can reduce damage to the internal capillary tube hydrogen storage unit caused by external impact. The opening end of the capillary tube hydrogen storage unit is connected with the packaging valve using packaging glue, and the packaging valve has an on-off switch to control the connection and disconnection of the gas inside the capillary tube hydrogen storage device and the outside gas.

[0027] 5. The capillary tube hydrogen storage unit is drawn entirely using glass round tubes, without the need for special-shaped glass tubes, which reduces material costs. The drawing process is simple without the need for a mold, and the capillary tube hydrogen storage unit is directly drawn, which simplifies the overall process flow and makes it more efficient and easier to achieve large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 is a schematic diagram of the front view and top view of the device according to the present application;

[0029] Figure 2 Fig. 3 is a schematic diagram of the capillary tube hydrogen storage unit structure of the device according to the present application;

[0030] Wherein: 1, capillary tube hydrogen storage unit; 1-1, opening end of the hydrogen storage unit; 1-2, closed end of the hydrogen storage unit; 2, buffer layer; 3, shell; 4, packaging valve; 5, hydrogen storage unit support tube; 6, primary composite tube; 7, capillary sub-tube. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application are described below to facilitate understanding of the present application by those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments. It is obvious to those skilled in the art that any changes within the spirit and scope of the present application as defined in the appended claims are obvious, and all inventions utilizing the concept of the present application are within the scope of protection.

[0032] Example 1

[0033] A capillary hydrogen storage device is provided, which comprises a capillary hydrogen storage unit 1 with a diameter of 5-60 mm and a length of 100-2000 mm. The capillary hydrogen storage unit 1 comprises a hydrogen storage unit support tube 5, which is coated with a buffer layer 2 made of an organic material. The buffer layer 2 is coated with a metal shell 3. The thickness of the buffer layer 2 is 1-20 mm, and the thickness of the shell 3 is 0.5-5 mm. The upper end of the hydrogen storage unit support tube 5 is a hydrogen storage unit open end 1-1, which is connected with a sealing valve 4 provided with a gas valve. The lower end of the hydrogen storage unit support tube 5 is a hydrogen storage unit closed end 1-2, and the hydrogen storage unit support tube 5 is provided with a plurality of primary composite tubes 6. The primary composite tubes 6 and the gaps between the primary composite tubes 6 and the hydrogen storage unit support tube 5 are provided with capillary sub-tubes 7.

[0034] Specifically, the hydrogen storage unit support tube 5, the primary composite tube 6, and the capillary sub-tube 7 are all glass round tubes. The capillary hydrogen storage unit 1 is wrapped by the shell 3 and the buffer layer 2. The shell 3 is made of thin-walled metal and provides impact protection for the internal capillary hydrogen storage unit 1. The buffer layer 2 between the shell 3 and the capillary hydrogen storage unit 1 is made of a relatively soft organic material such as foam glue or epoxy resin, which can reduce the damage of external impact force to the internal capillary hydrogen storage unit 1. The open end of the capillary hydrogen storage unit 1 is connected with the sealing valve 4 using sealing glue. The sealing valve 4 is provided with an on-off switch to control the opening and closing of the gas between the capillary hydrogen storage device and the outside.

[0035] Embodiment 2

[0036] A method for manufacturing the capillary hydrogen storage unit in Embodiment 1 is provided, which comprises the following steps:

[0037] S1. Select a group of borosilicate glass tubes with a diameter of 5-60 mm and a wall thickness of 1-10 mm as the mother tube for drawing the capillary hydrogen storage unit 1. The mother tube is cleaned with acid and alkali solutions and then washed with pure water. The glass mother tube is dried by blowing inert gas.

[0038] S2. Fix one end of the cleaned glass mother tube on a stepping motor and send the other end into a cylindrical hollow heating furnace. The central axis of the glass mother tube is consistent with the central axis of the heating furnace to ensure uniform heating of the glass mother tube. The temperature of the heating furnace is 500-1000℃.

[0039] S3, the glass mother tube is softened in the heating furnace, the lower end of the softened glass mother tube is led out of the heating furnace and placed on the lower drawing workpiece, the upper stepper motor feeds the glass mother tube into the heating furnace at a uniform speed of 0.5-100 mm per minute, the drawing workpiece draws the glass mother tube softened in the heating furnace at a uniform speed of 1-10000 mm per minute, a glass capillary tube with a diameter of 50-5000 microns is formed, and the glass capillary tube with a fixed length is cut to form the capillary sub-tube 7;

[0040] S4, a plurality of capillary sub-tubes 7 are inserted into the glass mother tube, the diameter ratio of the glass mother tube to the capillary sub-tube 7 is greater than 10, the glass mother tube filled with the glass sub-tube is called a primary composite rod, and the primary composite rod is sintered and solidified into a water droplet-shaped closed end at one end by using a high-temperature spray gun;

[0041] S5, the primary composite rod is placed into the heating furnace with the closed end downward, and the open end is fixed on the upper stepper motor, which is similar to the process of drawing the capillary sub-tube in steps S2 and S3, the primary composite rod is drawn to form a primary composite tube 6, and the diameter of the primary composite glass tube is 1-5 mm;

[0042] S6, the primary composite tube 6 is inserted into the glass mother tube, the gap between the primary composite tube 6 and the glass mother tube is filled with the capillary sub-tube 7, and the glass mother tube filled with the primary composite tube 6 and the capillary sub-tube 7 becomes a secondary composite rod, and the secondary composite rod is sintered into a water droplet-shaped closed end at one end by using a high-temperature spray gun;

[0043] S7, the secondary composite rod is repeatedly in steps S2 and S3 to obtain an unsealed capillary tube hydrogen storage unit 1, and the unit is sintered and sealed at one end by using a high-temperature spray gun, thereby completing the drawing of the capillary tube hydrogen storage unit 1.

[0044] The capillary tube hydrogen storage unit is drawn by using glass round tubes, without special-shaped glass tubes, so that the material cost is low. In the drawing process, no mold is needed, the drawing process is simpler, the capillary tube hydrogen storage unit is directly drawn, the overall process is simple and efficient, and mass production is easier to realize.

[0045] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalents of the elements of the claims are intended to be embraced therein.

[0046] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A method of manufacturing a capillary hydrogen storage unit, characterized by, The capillary hydrogen storage unit (1) comprises a hydrogen storage unit support tube (5), the upper end of the hydrogen storage unit support tube (5) is a hydrogen storage unit open end (1-1), the hydrogen storage unit open end (1-1) is connected with a packaging valve (4), the lower end of the hydrogen storage unit support tube (5) is a hydrogen storage unit closed end (1-2), and a plurality of primary composite tubes (6) are arranged in the hydrogen storage unit support tube (5); capillary sub-tubes (7) are arranged in the primary composite tubes (6) and the gaps between the primary composite tubes (6) and the hydrogen storage unit support tube (5). The manufacturing method of the capillary hydrogen storage unit comprises the following steps: S1, the thin-walled glass tube is placed in a heating furnace, heated to a softened state and drawn into a capillary sub-tube (7); S2, the thin-walled glass tube is filled with the capillary sub-tubes (7) arranged in order to form a primary composite rod; S3, the primary composite rod is placed in a heating furnace, heated and softened, and then drawn to form a primary composite tube (6); S4, the thin-walled glass tube is filled with the primary composite tubes (6), and the gaps between the primary composite tubes (6) and the thin-walled glass tube are filled with the capillary sub-tubes (7) to form a secondary composite rod; S5, the secondary composite rod is placed in a heating furnace, heated and softened, and then drawn and cut to form a hydrogen storage unit blank tube; S6, one end of the hydrogen storage unit blank tube is heated by a high-temperature spray gun, melted, and self-sealed to form a water-drop-shaped closed end (1-2), and the capillary hydrogen storage unit (1) is completed.

2. The method of claim 1, wherein The hydrogen storage unit support tube (5), the primary composite tube (6) and the capillary sub-tube (7) are all glass round tubes.

3. The method of claim 1, wherein The hydrogen storage unit support tube (5) is sleeved with a buffer layer (2) made of an organic material.

4. The method of claim 3, wherein The buffer layer (2) is sleeved with a metal shell (3).

5. The method of claim 1, wherein The packaging valve (4) is provided with a gas valve.

6. The method of claim 1, wherein The diameter of the capillary hydrogen storage unit (1) is 5-60 mm, and the length is 100-2000 mm.

7. The method of claim 4, wherein the method further comprises: The thickness of the buffer layer (2) is 1-20 mm, and the thickness of the shell (3) is 0.5-5 mm.

8. The method of claim 1, wherein In steps S1, S2 and S4, the thin-walled glass tube is a round glass tube made of borosilicate glass or quartz glass.

9. The method of claim 1, wherein In step S1, the diameter ratio of the thin-walled glass tube to the capillary sub-tube (7) is greater than 10.

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