Gas dynamic sealing device and winding machine

Abstract

The present invention provides a gas dynamic sealing device and a winding machine. The gas dynamic sealing device includes a rotating shaft and a static sealing unit. One end of the rotating shaft is connected to a transmission mechanism, and the other end of the rotating shaft is connected to a component to be processed. The static sealing unit is disposed on the periphery of the rotating shaft and is sealed therewith. The rotating shaft is rotatable relative to the static sealing unit. A gas transmission channel is disposed within the rotating shaft. The static sealing unit is connected to the gas transmission channel and can continuously deliver gas to the component to be processed. The gas dynamic sealing device of the present invention can quickly modify a Type III hydrogen storage cylinder winding machine, realize online automated programmed gas stamping operations, and improve the production efficiency and safety of hydrogen storage cylinders. It has a simple structure and is easy to produce and process.

Description

Technical Field

[0001] The present invention relates to the field of pressure vessel manufacturing, and in particular to a gas dynamic sealing device and a winding machine. Background Art

[0002] Hydrogen energy has attracted much attention as the ultimate energy source of the future, and countries are constantly increasing their efforts to utilize hydrogen energy. Hydrogen-powered vehicles have the advantages of being clean, having high energy utilization efficiency and no greenhouse gas emissions. They are widely regarded as the next generation of motor vehicles to solve energy and environmental problems, and will play an important role in the passenger car field.

[0003] High-pressure gaseous hydrogen storage has become the dominant method for on-board hydrogen storage due to its advantages, including simple structure, high mass hydrogen storage density, and rapid filling and discharge. Currently, aluminum-lined Type III hydrogen storage cylinders are widely used in China. However, plastic-lined composite material cylinders offer advantages over traditional aluminum-lined fiber-wound cylinders, such as lighter weight and greater fatigue resistance, making them a popular development and application area.

[0004] Due to the low structural strength of the plastic liner itself, compressed gas needs to be continuously supplied inside the plastic liner during the fiber winding process to provide structural strength to the plastic liner. However, the existing Type III gas cylinder wrapping machine cannot achieve gas sealing in a dynamic environment and cannot provide the compressed gas required to support the liner, resulting in the need for a special Type IV hydrogen storage gas cylinder dedicated wrapping machine, which is expensive and has high production costs.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The problem solved by the present invention is that the existing III-type gas cylinder wrapping machine cannot realize the production of plastic-lined composite material gas cylinders.

[0007] To solve the above problems, the present invention provides a gas dynamic sealing device, including a rotating shaft and a static sealing unit, one end of the rotating shaft is connected to a transmission mechanism, and the other end of the rotating shaft is connected to a part to be processed; the static sealing unit is arranged on the periphery of the rotating shaft and is sealed with the rotating shaft, the rotating shaft can rotate relative to the static sealing unit, a gas transmission channel is provided in the rotating shaft, and the static sealing unit is connected to the gas transmission channel, so as to continuously supply gas to the part to be processed.

[0008] This setting enables dynamic gas sealing of the rotating shaft, continuously delivers gas to the parts to be processed, meets the processing requirements of plastic liners, and facilitates the modification of the winding machine to meet the production of Type IV hydrogen storage cylinders.

[0009] Preferably, the rotating shaft is provided with an air inlet interface, which is arranged along the radial direction of the rotating shaft, one end of the air inlet interface is communicated with the static sealing unit, and the other end of the air inlet interface is communicated with the air transmission channel.

[0010] This arrangement is simple in structure and convenient for production and processing. The number of the air inlet ports is set as needed. Preferably, the air supply channel is provided with a pressure gauge for detecting and calibrating the actual pressure of the gas delivered to the part to be processed; the air supply channel is also provided with a second shut-off valve for controlling the on-off of the gas supply to the part to be processed.

[0011] Preferably, the gas dynamic sealing device also includes a metal disk, which is sleeved on the rotating shaft and located on the side of the static sealing unit. The metal disk is connected to the rotating shaft through threads, and a sealing ring is provided between the metal disk and the static sealing unit for dynamic sealing between the rotating shaft and the static sealing unit.

[0012] The dynamic seal between the static sealing unit and the rotating shaft is achieved by squeezing the sealing ring through the rotating metal disk. The structure is simple and easy to process. The thread pushes to provide a pressure that matches the pressure of the sealing ring, achieving a good sealing effect.

[0013] Preferably, the static sealing unit includes a first shell sleeved on the rotating shaft, the sealing ring includes a first sealing ring, the metal disk is provided with a groove, the first sealing ring is arranged in the groove, and the first sealing ring abuts against the first shell on the side away from the groove.

[0014] The number of the sealing rings can be set as needed, and the material of the sealing rings is required to have self-lubrication, good wear resistance, and high-temperature sealing stability, for example, made of flexible graphite material.

[0015] Preferably, the sealing ring further includes a second sealing ring, and the static sealing unit further includes a second housing. The second housing is sleeved around the periphery of the first housing, and the second sealing ring is disposed between the second housing and the metal disk. Preferably, the second sealing ring has the same structure and dimensions as the first sealing ring and is similarly disposed within the groove of the metal disk. This arrangement achieves a double-layer seal for the static sealing unit, accurately inputting the air source pressure into the plastic liner with high precision, and improving product quality. Preferably, the second sealing ring has the same structure and dimensions as the first sealing ring.

[0016] Preferably, the first shell and / or the second shell is provided with a corrugated section, and the corrugated section is annular and extends along the length direction of the rotating shaft.

[0017] This arrangement ensures that when the first metal disc on the side is pushed, the corrugated section is squeezed and slightly deformed to store energy. When the seal ring wears out after long-term use, the corrugated section can stretch to ensure that the pressure applied to the seal ring is nearly constant. The elastic coefficient of the corrugated section can be designed based on the pressure coefficient of the seal ring.

[0018] Preferably, a reinforcing rib is provided between the first shell and the second shell, and the reinforcing rib extends in the direction of the rotating shaft. The double sealing layer thin shell structure is adopted, and the two layers are connected by reinforcing ribs placed at intervals, which can further increase the mechanical strength of the static sealing unit.

[0019] Preferably, there are multiple reinforcing ribs, which are radially arranged at equal intervals along the radial direction of the first shell. This arrangement reduces the weight of the device while improving the structural stability.

[0020] Preferably, the first shell and the rotating shaft form a first sealed space, and a second sealed space is formed between the first shell and the second shell. The static sealing unit includes a pressure control unit, and a second channel is set between the pressure control unit and the first shell for conveying gas to the first sealed space; a first channel is set between the pressure control unit and the second shell for conveying gas to the second sealed space.

[0021] Gas is input into the first sealed space and the second sealed space at the same time through the pressure control unit to ensure that the pressure in the double-layer sealed space is the same. Even if the sealing ring close to the rotating shaft is worn for a long time and leaks slightly, the outer sealing ring can ensure that there is no leakage, so that the precise air source pressure can be input into the plastic liner.

[0022] Compared with the prior art, the gas dynamic sealing device described in the present invention has the following beneficial effects: 1) The present invention can realize the rapid transformation of the Type III hydrogen storage cylinder wrapping machine, realize online automated programmed gas stamping operations, and improve the production efficiency and production safety of hydrogen storage cylinders; 2) By setting up a static sealing unit, dynamic sealing of the rotating shaft can be achieved, so as to continuously and stably deliver gas to the plastic liner; 3) The structure is simple and easy to produce and process.

[0023] The present invention also provides a wrapping machine comprising the above-mentioned gas dynamic sealing device. The wrapping machine is used for the production of Type IV hydrogen storage cylinders and has the same beneficial effects as the above-mentioned gas dynamic sealing device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall schematic diagram of the gas dynamic sealing structure according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic structural diagram of a static sealing unit according to an embodiment of the present invention;

[0027] Figure 4 This is a side view of the static sealing unit according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1-rotating shaft; 101-gas transmission channel; 102-external thread; 2-sealing ring; 21-first sealing ring; 22-second sealing ring; 3-static sealing unit; 31-first shell; 311-corrugated section; 32-second shell; 4-pressure control unit; 5-first channel; 6-second channel; 7-first stop valve; 8-metal disk; 81-first metal disk; 811-groove; 812-cavity; 82-second metal disk; 10-reinforcement rib; 11-air inlet interface; 12-pressure gauge; 13-second stop valve; 14-plastic liner; 15-first sealed space; 16-second sealed space. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. It should be noted that the embodiments of the present invention and the features of the embodiments can be combined with each other unless they conflict. Those skilled in the art can make adjustments as needed to suit specific applications.

[0031] With the upgrading of passenger vehicles and other transportation vehicles, new energy vehicles are experiencing strong market adoption, and the hydrogen vehicle sector is booming. The hydrogen storage density of hydrogen storage cylinders is a key factor limiting the range of hydrogen fuel cell vehicles. For example, using a commonly used 70Mpa hydrogen storage cylinder as an example, the use of a plastic liner can increase the hydrogen storage density by more than half compared to a metal liner. This plastic liner offers excellent resistance to hydrogen embrittlement corrosion and provides enhanced safety, making it a key development direction for on-board hydrogen storage cylinders.

[0032] Type IV hydrogen storage cylinders are constructed, from the inside out, of a plastic liner 14, a carbon fiber wrapping layer, and a glass fiber wrapping layer. During the manufacturing process, compressed gas is injected into the plastic liner 14 to provide support, and carbon fiber prepreg is then evenly wrapped around the outer wall of the plastic liner 14. Currently, specialized wrapping machines for Type IV hydrogen storage cylinders are expensive, and domestic Type III wrapping machines are unable to deliver gas into the liner, necessitating urgent modification. This patent addresses this issue by adding a dynamic gas seal to Type III wrapping machines to enable the production of Type IV hydrogen storage cylinders.

[0033] Example 1

[0034] like Figure 1-4As shown, a gas dynamic sealing device includes a rotating shaft 1, one end of the rotating shaft 1 is connected to a transmission mechanism, and the other end of the rotating shaft 1 is connected to a part to be processed; a static sealing unit 3 is provided on the periphery of the rotating shaft 1, and the rotating shaft 1 can rotate relative to the static sealing unit 3, and a gas supply channel 101 is provided in the rotating shaft 1, and the static sealing unit 3 is connected to the gas supply channel 101, for continuously supplying gas to the part to be processed. The part to be processed is the inner liner of a double-layer structure product, such as the plastic inner liner 14 for preparing a hydrogen storage cylinder. Preferably, the rotating shaft 1 is a linear rotating metal shaft, one end of the rotating shaft 1 is connected to the transmission unit, for driving the rotating shaft 1 to rotate in a programmed manner; the other end of the rotating shaft 1 is sealed and connected to the part to be processed, and the connection method between the rotating shaft 1 and the part to be processed and the transmission unit is the existing technology and will not be repeated here. During operation, the rotating shaft 1 drives the component to be processed to rotate according to the design program, and the static sealing unit 3 maintains a constant spatial position to achieve automatic stamping control on the plastic liner 14 of the hydrogen storage cylinder.

[0035] The rotating shaft 1 is provided with an air inlet interface 11, which is arranged radially along the rotating shaft 1. One end of the air inlet interface 11 is connected to the static sealing unit 3, and the other end of the air inlet interface 11 is connected to the air supply channel 101, and the air supply channel 101 is connected to the part to be processed. The number of air inlet interfaces 11 is set to one or more as needed. Preferably, the air supply channel 101 is provided with a pressure gauge 12 for detecting and calibrating the actual pressure of the gas delivered to the part to be processed; the air supply channel 101 is also provided with a second shut-off valve 13 for controlling the on-off of the gas supply to the part to be processed.

[0036] As an example of the present invention, the gas dynamic sealing device further includes a metal disk 8, which is sleeved on the rotating shaft 1 and located on the side of the static sealing unit 3. The metal disk 8 is threadedly connected to the rotating shaft 1. A sealing ring 2 is disposed between the metal disk 8 and the static sealing unit 3 to achieve a dynamic seal between the metal disk 8 and the static sealing unit 3. Preferably, a groove 811 is provided on a side of the metal disk 8 near the static sealing unit 3. The groove 811 is annular and is configured to accommodate the sealing ring 2. This configuration limits the position of the sealing ring 2, ensuring a continuous and reliable seal during operation.

[0037] Preferably, the metal disc 8 includes a first metal disc 81 and a second metal disc 82. The first metal disc 81 is located on one side of the static sealing unit 3 and is threadedly connected to the rotating shaft 1. The second metal disc 82 is located on the other side of the static sealing unit 3 and is integrally formed with the rotating shaft 1. For example, the rotating shaft 1 is provided with an external thread 102 at one end near the first metal disc 81. The external thread 102 is located on the outer wall of the rotating shaft 1. The first metal disc 81 is disposed around the external thread 102. The external thread 102 cooperates with the first metal disc 81 to squeeze the sealing ring 2, thereby achieving a rotational seal between the static sealing unit 3 and the rotating shaft 1.

[0038] Preferably, the machining direction of the external thread 102 is opposite to the rotation direction of the shaft 1, ensuring passive locking of the thread during the rotation of the shaft 1. Preferably, the first metal disk 81 and / or the second metal disk 82 are provided with a cavity 812. The hollow structure allows the cavity to be filled with cooling water to cool the sealing ring 2 during operation, preventing it from overheating and causing failure.

[0039] The number of sealing rings 2 can be set as needed. The material of the sealing rings 2 is required to be self-lubricating, wear-resistant, and have high-temperature sealing stability, such as flexible graphite. Preferably, the sealing ring 2 is annular and cooperates with the metal disk 8 to form a gas-sealed space. The threaded seal provides a pressure that matches the bearing capacity of the sealing ring 2, achieving a good sealing effect. Preferably, there are four sealing rings 2, with equal numbers positioned on the left and right sides of the static sealing unit 3. This arrangement creates a double-layer sealed space, enhancing the gas sealing effect and providing greater reliability.

[0040] As an example of the present invention, the static sealing unit 3 includes a first housing 31 sleeved on the rotating shaft 1, forming a first sealed space 15 between the first housing 31 and the rotating shaft 1. A first sealing ring 21 is disposed within the groove 811 of the metal disk 8, and the sidewall of the first housing 31 abuts against the first sealing ring 21. Preferably, the width of the first sealing ring 21 is greater than the thickness of the first housing 31, the upper edge of the groove 811 is positioned higher than the first housing 31, and the lower edge of the groove 811 is positioned lower than the first housing 31.

[0041] Preferably, the static sealing unit 3 further includes a second housing 32, which is sleeved around the first housing 31. A second sealed space 16 is formed between the first and second housings 31, 32. A second sealing ring 22 is provided between the second housing 32 and the metal plate 8. This arrangement achieves a double-layer seal for the static sealing unit 3, accurately inputting the air source pressure into the plastic liner 14 with high precision, and improving product quality.

[0042] Preferably, the first shell 31 and / or the second shell 32 is provided with a corrugated section 311, which is annular and coaxially arranged with the rotating shaft 1. This arrangement ensures that when pushed by the first metal disk 81 on the side, the corrugated section 311 is in an extruded state and slightly deforms to store energy. When the sealing ring 2 is worn out after long-term use, the corrugated section 311 can be stretched to ensure that the pressure applied to the sealing ring 2 is almost constant. The elastic coefficient of the corrugated section 311 can be designed according to the pressure bearing coefficient of the sealing ring 2. Preferably, the length of the corrugated section 311 is L1, and the length of the first shell 31 is L2, where L1 = (1 / 10-1 / 5) * L2. This range can take into account the mechanical strength of the first shell 31 and the deformation energy storage effect after being squeezed. Preferably, the first shell 31 is also provided with a first stop valve 7 for emergency pressure relief after abnormal pressurization, which is safer.

[0043] The static sealing unit 3 also includes a pressure control unit 4. A second channel 6 is provided between the pressure control unit 4 and the first shell 31 for introducing gas into the first sealed space 15. By detecting the internal gas pressure and comparing it with the program design value, the internal pressure of the static sealing unit 3 is automatically adjusted to achieve precise control of the internal pressure of the plastic liner 14. A first channel 5 is provided between the pressure control unit 4 and the second shell 32. The first channel 5 is used to introduce compressed gas into the second sealed space 16. Gas is input into the first sealed space 15 and the second sealed space 16 at the same time through the pressure control unit 4 to ensure that the pressure in the double-layer sealed space is the same. Even if the sealing ring 2 set close to the inside, that is, close to the rotating shaft 1, is worn for a long time and has a slight leakage, the outer sealing ring 2 can ensure that there is no leakage, thereby achieving precise air source pressure input to the plastic liner 14.

[0044] Preferably, reinforcing ribs 10 are provided within the second sealed space 16, extending in the direction of the rotating shaft 1. A double-layer thin-shell structure, connected by spaced reinforcing ribs 10, further enhances the mechanical strength of the static sealing unit 3. Preferably, multiple reinforcing ribs 10 are radially arranged at equal intervals along the radial direction of the first shell 31. This reduces the weight of the device while improving structural stability.

[0045] This patented device is designed as a wrapping tool for Type IV hydrogen storage cylinders. It is used for automated, precise pressure control during the winding process of Type IV cylinders, enabling direct conversion from existing Type III cylinder wrapping machines to Type IV cylinder wrapping machines. During assembly, the static seal unit 3 is continuously tightened through the metal disk 8, confining the sealing ring 2 within the groove 811. Based on the pressure-bearing requirements of the sealing ring 2, the distance the metal disk 8 is screwed into the external thread 102 on the rotating shaft 1 is controlled to apply appropriate pressure, ensuring a good seal between the static seal unit 3 and the rotating shaft 1. Cooling water is simultaneously injected into the cavity 812 of the metal disk 8 to cool the sealing ring 2 during operation.

[0046] The plastic liner 14 is tightly fixed to one end of the rotating shaft 1. The other end of the rotating shaft 1 is fixed to the winding machine transmission unit, driving the rotating shaft 1 to rotate to wind the plastic liner 14. The static sealing unit 3 is kept stationary by the sliding of the sealing ring 2. An external air source supplies compressed gas to the first sealed space 15 through the second channel 6. After passing through the air inlet interface 11, it enters the plastic liner 14 through the air delivery channel 101. At the same time, the compressed gas enters the second sealed space 16 through the first channel 5, supplementing the sealing security of the first sealed space 15. At the same time, the first shell 31 and the second shell 32 are connected by a reinforcing rib 17 to realize an integrated double-layer thin shell structure, which is beneficial to structural stability.

[0047] Through program control by the pressure control unit 4, precise automatic control of the gas pressure in the first sealed space 15 and the second sealed space 16 can be achieved, enabling automated stamping of the plastic liner 14, improving production safety and efficiency. The actual pressure of the plastic liner 14 can be monitored and fed back in real time, and the system can determine whether there is a pressure leak and issue an alarm. In addition, a pressure gauge 12 is provided on the gas supply channel 101 of the rotating shaft 1 for real-time detection of the pressure of the compressed gas fed back into the plastic liner 14. A second shut-off valve 13 is also provided on the gas supply channel 101 to maintain pressure within the plastic liner 14 after the winding process is completed, facilitating demolding and subsequent heat treatment operations.

[0048] The present invention further provides a wrapping machine comprising the above-mentioned gas dynamic sealing device. The wrapping machine has the same beneficial effects as the above-mentioned gas dynamic sealing device, which will not be described in detail here.

[0049] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A gas dynamic sealing device for the production of 70Mpa hydrogen storage cylinders, characterized in that: The invention comprises a rotating shaft (1) and a static sealing unit (3), wherein one end of the rotating shaft (1) is connected to a transmission mechanism, and the other end of the rotating shaft (1) is connected to a component to be processed; the static sealing unit (3) is arranged on the periphery of the rotating shaft (1) and is sealed with the rotating shaft (1); the rotating shaft (1) can rotate relative to the static sealing unit (3); an air delivery channel (101) is arranged in the rotating shaft (1), and the static sealing unit (3) is connected to the air delivery channel (101) and can continuously deliver gas to the component to be processed; the gas dynamic sealing device also comprises a metal A metal plate (8) is provided between the metal plate (8) and the static sealing unit (3), and a sealing ring (2) is provided for dynamic sealing between the rotating shaft (1) and the static sealing unit (3). The metal plate (8) is provided with a cavity (812), and cooling water is injected into the cavity (812) to cool the sealing ring (2) during operation. The metal plate (8) includes a first metal plate (81) and a second metal plate (82). The first metal plate (81) is located on one side of the static sealing unit (3) and is connected to the rotating shaft (1) by a thread. The second metal plate (82) is provided with a cavity (812). The disk (82) is located on the other side of the static sealing unit (3) and is integrally formed with the rotating shaft (1); the sealing ring (2) includes a first sealing ring (21); the metal disk (8) is provided with a groove (811); the first sealing ring (21) is arranged in the groove (811); the first sealing ring (21) abuts against the first shell (31) on the side away from the groove (811); the sealing ring (2) also includes a second sealing ring (22); the second sealing ring (22) is provided between the second shell (32) and the metal disk (8); The first housing (31) and the rotating shaft (1) form a first sealed space (15), and a second sealed space (16) is formed between the first housing (31) and the second housing (32). The static sealing unit (3) includes a pressure control unit (4), and a second channel (6) is provided between the pressure control unit (4) and the first housing (31) for conveying gas to the first sealed space (15); and a first channel (5) is provided between the pressure control unit (4) and the second housing (32) for conveying gas to the second sealed space (16). The static sealing unit (3) comprises a first shell (31) and a second shell (32) sleeved on the rotating shaft (1); the second shell (32) is sleeved on the periphery of the first shell (31); the first shell (31) and / or the second shell (32) are provided with a corrugated section (311); the corrugated section (311) is annular and extends along the length direction of the rotating shaft (1).

2. The gas dynamic sealing device according to claim 1, characterized in that: The rotating shaft (1) is provided with an air inlet interface (11), which is arranged along the radial direction of the rotating shaft (1), one end of the air inlet interface (11) is communicated with the static sealing unit (3), and the other end of the air inlet interface (11) is communicated with the air delivery channel (101).

3. The gas dynamic sealing device according to claim 1, characterized in that: A reinforcing rib plate (10) is provided between the first shell (31) and the second shell (32), and the reinforcing rib plate (10) extends along the length direction of the rotating shaft (1).

4. The gas dynamic sealing device according to claim 3, characterized in that: There are a plurality of reinforcing rib plates (10), and the reinforcing rib plates (10) are radially arranged at equal intervals along the radial direction of the first shell (31).

5. A winding machine, characterized in that: The invention comprises the gas dynamic sealing device according to any one of claims 1 to 4.

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