Ultralow-temperature rotary joint for liquid hydrogen loading and unloading arm

Abstract

The utility model discloses an ultralow-temperature rotary joint for a liquid hydrogen loading and unloading arm. The ultralow-temperature rotary joint can be mounted on a rotary joint of the liquid hydrogen loading and unloading arm. The connector comprises a connecting flange, a rotating outer ring, a rotating inner ring track and a rotating inner ring, the rotating inner ring track is embedded in the rotating inner ring, a partition cavity is reserved between the rotating inner ring track and the rotating inner ring, stainless steel balls are arranged in the rotating inner ring track, the rotating outer ring is installed on a combination of the rotating inner ring track and the rotating inner ring through the stainless steel balls, and the rotating inner ring is installed on the rotating outer ring. One end of the rotating outer ring and one end of the rotating inner ring are jointly connected with the connecting flange, and sealing assemblies are arranged among the connecting flange, the rotating outer ring, the rotating inner ring track and the rotating inner ring. The liquid hydrogen loading and unloading arm is simple and practical in structure, safety and reliability of the liquid hydrogen loading and unloading arm are improved, and it is guaranteed that the ultralow-temperature rotary connector is resistant to low temperature, free of leakage and flexible in rotation.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid hydrogen loading and unloading devices, in particular to an ultra-low temperature rotary joint for a liquid hydrogen loading and unloading arm. Background Art

[0002] Under the background of the "dual carbon" goal, my country's energy structure will change from fossil energy to renewable energy. Hydrogen energy will become the best choice for the transformation process. The exploration of liquid hydrogen loading and unloading equipment technology has gradually laid the foundation for the rapid development of hydrogen energy. Liquid hydrogen will gradually be widely used. Due to the extremely low temperature of liquid hydrogen, hydrogen embrittlement of metals, and small molecules, liquid hydrogen has safety problems such as leakage and explosion during storage and loading and unloading. At present, cryogenic loading and unloading arms and rotary joints cannot meet the current working conditions of liquid hydrogen. Therefore, higher safety and reliability requirements are put forward for liquid hydrogen loading and unloading equipment. Improving the safety and reliability performance of liquid hydrogen loading and unloading equipment has become an inevitable trend and an inevitable demand of the liquid hydrogen industry.

[0003] The ultra-low temperature rotary joint of the liquid hydrogen loading and unloading arm is a key component to complete the liquid hydrogen loading and unloading arm. The existing liquid loading and unloading arm's adapter has defects such as inresistance to hydrogen embrittlement, poor sealing and waste of protective gas. Utility Model Content

[0004] The purpose of the utility model is to provide an ultra-low temperature rotary joint for a liquid hydrogen loading and unloading arm, which realizes the rotation of the liquid hydrogen loading and unloading arm joint and meets the relevant requirements of liquid hydrogen ultra-low temperature, hydrogen embrittlement resistance, and dynamic sealing safety performance.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A super-low temperature rotary joint for a liquid hydrogen loading and unloading arm can be installed on the rotary joint of the liquid hydrogen loading and unloading arm, comprising a connecting flange, a rotating outer ring, a rotating inner ring track and a rotating inner ring, wherein the rotating inner ring track is embedded in the rotating inner ring, a stainless steel ball can roll in the rotating inner ring track, and a partition is left between the rotating inner ring track and the rotating inner ring to prevent the rotating inner ring track from directly contacting the rotating inner ring and affecting its temperature, thereby reducing the strength performance of its structural material, a stainless steel ball is arranged in the rotating inner ring track, and the rotating outer ring is installed on the combination of the rotating inner ring track and the rotating inner ring through the stainless steel ball, the rotating outer ring, the stainless steel ball, the rotating inner ring track and the rotating inner ring together form a rotating pair, one end of the rotating outer ring and the rotating inner ring are commonly connected to the connecting flange, and a sealing component is arranged between the connecting flange, the rotating outer ring, the rotating inner ring track and the rotating inner ring.

[0007] Furthermore, the connecting flange and the rotating outer ring are fastened together by means of outer ring fastening screws.

[0008] Further, a primary sealing ring is provided between the upper side of the rotating inner ring and the connecting flange. A secondary sealing ring is provided at the connection intersection of the connecting flange, the rotating outer ring, and the rotating inner ring. The primary sealing ring realizes the first - stage dynamic sealing of the structure to prevent the leakage of the liquid inside the pipeline. The secondary sealing ring realizes the second - stage dynamic sealing of the structure to further prevent the leakage of the liquid inside the pipeline.

[0009] Further, an end - face sealing ring is installed between the connecting flange and the rotating outer ring to realize the static sealing between the connecting flange and the rotating outer ring, isolate the raceway cavity from the outside world, and prevent the leakage of the protective gas inside the raceway.

[0010] Further, an outer - side sealing ring is provided at the connection between the bottom of the rotating outer ring and the rotating inner ring to realize the dynamic sealing between the rotating outer ring and the rotating inner ring, block the raceway cavity from the outside world, and prevent the leakage of the protective gas inside the raceway.

[0011] Further, a first ball cock and a second ball cock corresponding to the positions of the stainless - steel balls are provided on the rotating outer ring to block the stainless - steel balls and prevent them from overflowing. At the same time, the first ball cock is connected to the input channel, which is the input channel for the protective gas. The protective gas makes the surrounding environment of the stainless - steel balls in a dry and inert environment. The second ball cock is connected to the output channel, which is the output channel for the protective gas. The protective gas replaces other gases in the raceway cavity through the output channel to maintain a dry and inert environment inside the raceway cavity. After the replacement of the inert environment is completed, it can be closed through the second ball cock, greatly reducing the use of the protective gas.

[0012] Further, the rotating outer ring and the rotating inner ring are made of nickel - containing austenitic stainless steel, which can be applied in the ultra - low - temperature environment of liquid hydrogen. The nickel content is greater than 12%, and the nickel equivalent is not less than 28.5%. It has strong hydrogen embrittlement resistance and good low - temperature performance.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model has functions such as low - temperature resistance, dynamic sealing without leakage, flexible rotation, no freezing, replaceable rotating inner - ring track, and track heat - insulation cavity, meeting the relevant requirements of the ultra - low temperature of liquid hydrogen, hydrogen embrittlement resistance, and dynamic - sealing safety performance, improving the safety and reliability of the liquid - hydrogen loading and unloading arm, ensuring the low - temperature resistance, no leakage, and flexible rotation of the ultra - low - temperature rotary joint. The structure of the present utility model is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross - sectional view of the present utility model in the front - view direction.

[0015] Figure 2 is a schematic installation structure diagram of the first ball cock of the present utility model.

[0016] Figure 3It is a schematic diagram of the installation structure of the second ball cock and the outer ring fastening screw of the present utility model.

[0017] In the figure: 1. Connecting flange, 2. Rotating outer ring, 3. Stainless steel ball, 4. Rotating inner ring track, 5. Rotating inner ring, 6. Primary sealing ring, 7. Secondary sealing ring, 8. Outer side sealing ring, 9. End face sealing ring, 10. First ball cock, 11. Second ball cock, 12. Outer ring fastening screw. Specific implementation mode

[0018] The following further describes the specific technical solutions of the present utility model with reference to the attached drawings, so as to facilitate those skilled in the art to further understand the present utility model.

[0019] Refer to Figure 1 、 Figure 2 and Figure 3 The cryogenic rotary joint for liquid hydrogen loading and unloading arm of the present utility model includes a connecting flange 1, a rotating outer ring 2, a stainless steel ball 3, a rotating inner ring track 4, a rotating inner ring 5, a primary sealing ring 6, a secondary sealing ring 7, an outer side sealing ring 8, an end face sealing ring 9, a first ball cock 10, a second ball cock 11, an outer ring fastening screw 12, etc.

[0020] The rotating outer ring 2 is installed on the connecting flange 1, and the connecting flange 1 and the rotating outer ring 2 are tightly connected by the outer ring fastening screw 12.

[0021] The rotating inner ring track 4 is embedded in the rotating inner ring 5, and the stainless steel ball 3 can roll in the rotating inner ring track 4.

[0022] The rotating outer ring 2 is installed on the combination of the rotating inner ring track 4 and the rotating inner ring 5 through the stainless steel ball 3, and the rotating outer ring 2, the stainless steel ball 3, the rotating inner ring track 4 and the rotating inner ring 5 together form a rotating pair.

[0023] The primary sealing ring 6 is installed between the connecting flange 1 and the rotating inner ring 5 to achieve the first structural dynamic seal and prevent the leakage of the liquid inside the pipeline.

[0024] The secondary sealing ring 7 is installed between the connecting flange 1 and the rotating inner ring 5 to achieve the second structural dynamic seal and prevent the leakage of the liquid inside the pipeline.

[0025] The end face sealing ring 9 is installed between the connecting flange 1 and the rotating outer ring 2 to achieve the static seal between the connecting flange 1 and the rotating outer ring 2, isolate the raceway cavity from the outside world, and prevent the leakage of the protective gas inside the raceway.

[0026] The outer sealing ring 8 described above is installed between the rotating outer ring 2 and the rotating inner ring 5 to achieve dynamic sealing between the rotating outer ring 2 and the rotating inner ring 5, block the raceway cavity from the outside world, and prevent the leakage of the protective gas inside the raceway.

[0027] The first steel ball plug 10 described above is installed on the rotating outer ring 2 to block the stainless steel balls 3 and prevent them from spilling out; it is also used as the input channel for the protective gas, and the protective gas protects the surrounding environment of the stainless steel balls 3 to be dry and inert.

[0028] The second steel ball plug 11 described above is installed on the rotating outer ring 2 to block the stainless steel balls 3 and prevent them from spilling out; it is also used as the output channel for the protective gas. The protective gas replaces other gases in the raceway cavity through the output channel to maintain a dry and inert environment inside the raceway cavity; after the replacement of the inert environment is completed, it can be closed through the second steel ball plug 11, greatly reducing the consumption of the protective gas.

[0029] When the rotating inner ring track 4 is embedded in the rotating inner ring 5, there is a separation cavity between the rotating inner ring track 4 and the rotating inner ring 5 to prevent the direct contact between the rotating inner ring track 4 and the rotating inner ring 5 from affecting their temperature, thereby reducing the strength performance of their structural materials.

[0030] The materials for making the rotating outer ring and the rotating inner ring are made of austenitic stainless steel, which can be applied in the ultra-low temperature environment of liquid hydrogen. The nickel content (by weight percentage) is greater than 12%, and the nickel equivalent is not less than 28.5%. It has strong resistance to hydrogen embrittlement and good low-temperature performance.

[0031] The structure of the utility model is simple and practical, with functions such as low-temperature resistance, dynamic sealing without leakage, flexible rotation, no freezing, replaceable rotating inner ring track, and track heat insulation cavity, meeting the relevant requirements of liquid hydrogen's ultra-low temperature, hydrogen embrittlement resistance, and dynamic sealing safety performance, improving the safety and reliability of the liquid hydrogen loading and unloading arm, and ensuring the low-temperature resistance, no leakage, and flexible rotation of the ultra-low temperature rotary joint.

[0032] The ultra-low temperature rotary joint of the liquid hydrogen loading and unloading arm is a key component to complete the liquid hydrogen loading and unloading arm. The functions of the ultra-low temperature rotary joint of the utility model need to meet the requirements of liquid hydrogen's ultra-low temperature, hydrogen embrittlement resistance, and sealing without leakage. Currently, there is no typical application of the liquid hydrogen ultra-low temperature rotary joint in the market.

[0033] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to this implementation manner without departing from the principle and essence of the present invention. The protection scope of the present invention is only limited by the appended claims.

Claims

1. A cryogenic swivel joint for a liquid hydrogen loading and unloading arm, characterized in that: It includes a connecting flange, a rotating outer ring, a rotating inner ring track and a rotating inner ring. The rotating inner ring track is embedded in the rotating inner ring, and there is a partition cavity between the rotating inner ring track and the rotating inner ring. Stainless steel balls are arranged in the rotating inner ring track, and the rotating outer ring is installed on the combination of the rotating inner ring track and the rotating inner ring through the stainless steel balls. One end of the rotating outer ring and the rotating inner ring is jointly connected to the connecting flange, and a sealing assembly is arranged between the connecting flange, the rotating outer ring, the rotating inner ring track and the rotating inner ring.

2. The cryogenic swivel joint for a liquid hydrogen loading and unloading arm according to claim 1, wherein: The connecting flange and the rotating outer ring are fixedly connected by outer ring fastening screws, and an end face sealing ring is installed at the connection.

3. The cryogenic swivel joint for a liquid hydrogen loading and unloading arm according to claim 1, characterized in that: An outer side sealing ring is arranged at the connection between the bottom of the rotating outer ring and the rotating inner ring.

4. The cryogenic swivel joint for a liquid hydrogen loading and unloading arm according to claim 1, characterized in that: A primary sealing ring is arranged between the upper side of the rotating inner ring and the connecting flange, and a secondary sealing ring is arranged at the intersection of the connections of the connecting flange, the rotating outer ring and the rotating inner ring.

5. The cryogenic swivel joint for a liquid hydrogen loading and unloading arm according to claim 1, characterized in that: The rotating outer ring is provided with a first ball cock and a second ball cock corresponding to the positions of the stainless steel balls. At the same time, the first ball cock communicates with the input channel, and the second ball cock communicates with the output channel.

6. The cryogenic swivel joint for a liquid hydrogen loading and unloading arm according to claim 1, characterized in that: The rotating outer ring and the rotating inner ring are made of austenitic stainless steel.

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