A high sealing rotary joint for LNG loading and unloading arms

Abstract

The utility model relates to sealing device technical field discloses a kind of high sealing rotary joint for LNG loading and unloading arm, including fixed column, the outside fixed communication of fixed column has liquid inlet pipe, the one end of liquid inlet pipe away from fixed column is provided with adapter, the outer ring of bearing is fixedly connected with the one end of adapter away from liquid inlet pipe, the inner ring of bearing is fixedly communicated with conveying pipe, the one end of conveying pipe away from bearing is fixedly communicated with transition mouth, the outside of transition mouth is provided with sealing ring, the outside of sealing ring is provided with monitoring cover, in the utility model, by the cooperation of sealing ring, sealing groove, sealing shell and monitoring cover, LNG can be efficiently and safely completed when conveying, and by the design of monitoring cover, it can be found in time when the problems such as rotary joint aging occur, solve the problem that traditional LNG loading and unloading arm rotary joint sealing is not high and leakage is not easy to find.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and in particular to a high-sealing rotary joint for LNG loading and unloading arms. Background Technology

[0002] LNG rotary joints are core components of LNG loading and unloading arms, storage tanks, and other equipment. Their function is to achieve a sealed connection between fixed pipelines and rotating components under cryogenic conditions, allowing relative rotation or small displacement between the two while preventing LNG leakage. Their significance lies in ensuring the flexibility of LNG transmission, adapting to positional deviations during equipment operation, avoiding pipeline stress damage, and preventing safety risks caused by cryogenic medium leakage through reliable sealing. They are a key component for maintaining the safe and efficient operation of LNG transportation systems.

[0003] The LNG rotary joint mainly consists of a fixed end, a rotating end, a cryogenic sealing assembly, bearings, and a dustproof and impurity-proof protective structure. The fixed end and the rotating end achieve relative rotation through the bearings, and the sealing assembly remains in contact at low temperatures to prevent LNG leakage. At the same time, it adapts to displacement deviations during equipment operation, allowing LNG to be smoothly transported from the fixed pipeline to the rotating component in a closed channel, ensuring transmission flexibility and safety.

[0004] However, traditional LNG rotary joints do not have high sealing performance, which can lead to LNG leakage, causing freezing and explosion risks, as well as energy loss, environmental pollution, interruption of loading and unloading operations, and impact on transportation links. In addition, traditional LNG loading and unloading arms are connected to transport vehicles by flanges, which takes a long time to dock, is difficult to adapt to displacement, has low efficiency, requires tools for disassembly and assembly, and is cumbersome to operate.

[0005] Therefore, a high-sealing rotary joint for LNG loading / unloading arms is provided to solve the problems mentioned in the background art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a high-sealing rotary joint for LNG loading and unloading arms, aiming to improve the problems of low sealing performance of rotary joints and time-consuming flange connection docking in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-sealing rotary joint for LNG loading and unloading arms, comprising a fixed column, an inlet pipe fixedly connected to the outside of the fixed column, a jacking interface provided at the end of the inlet pipe away from the fixed column, a flange fixedly connected to the outside of the jacking interface, an outer ring of a bearing fixedly connected to the end of the jacking interface away from the inlet pipe, a delivery pipe fixedly connected to the inner ring of the bearing, a sealing shell provided outside the delivery pipe, a sealing groove provided inside the sealing shell, a sealing ring provided outside the delivery pipe, a transition port fixedly connected to the end of the delivery pipe away from the bearing, a sealing ring provided outside the transition port, a monitoring cover provided outside the sealing ring, an extraction pipe fixedly connected to the end of the transition port away from the delivery pipe, and a connecting component provided at the end of the extraction pipe away from the transition port.

[0008] Furthermore, the connecting assembly includes a connector, which is fixedly connected to the outside of the extraction tube. A sliding sleeve is provided on the outside of the connector, and a pull ring is fixedly connected to the outside of the sliding sleeve. A pull rod is provided inside the pull ring, and a pawl is provided at the end of the pull rod away from the pull ring. A hydraulic rod is fixedly connected to the outside of the pawl, and a pressure plate is fixedly connected to the telescopic end of the hydraulic rod. A sealing head is fixedly connected to the end of the connector away from the extraction tube, and a spring is provided on the outside of the connector.

[0009] Furthermore, the sliding sleeve is slidably connected to the outside of the connector, and the pull rod is rotatably connected to the inside of the pull ring.

[0010] Furthermore, the spring is disposed outside the connector, between the sliding sleeve and the sealing head.

[0011] Furthermore, the sealing shell is fixed to the adapter, and the delivery pipe is rotatably connected to the outside of the bearing.

[0012] Furthermore, the sealing ring is disposed within the sealing groove and is in close contact with the outer peripheral surface of the conveying pipe.

[0013] Furthermore, the monitoring cover is made of quartz glass, and the interior of the monitoring cover is filled with a low-temperature fluorescent indicator.

[0014] Furthermore, the sealing ring, sealing ring, and sealing head are all made of perfluoroether rubber.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the combination of sealing ring, sealing groove, sealing shell and monitoring cover can complete the LNG transportation efficiently and safely. Furthermore, the design of the monitoring cover can promptly detect problems such as aging of the rotary joint, thus solving the problems of poor sealing and difficulty in detecting leakage in traditional LNG loading and unloading arm rotary joints.

[0017] 2. In this utility model, the connection component design allows for a quick, safe, and efficient connection between the LNG loading arm and the transport vehicle. Compared to the traditional flange connection method between the LNG loading arm and the transport vehicle, the connection time is shorter, the efficiency is higher, and no tools are required for disassembly and assembly, making the operation simple. Attached Figure Description

[0018] Figure 1 This is a perspective view of a high-sealing rotary joint for LNG loading and unloading arms proposed in this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of a high-sealing rotary joint for LNG loading and unloading arms proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the connection assembly structure of a high-sealing rotary joint for LNG loading and unloading arms proposed in this utility model.

[0021] Legend:

[0022] 1. Fixed column; 2. Inlet pipe; 3. Adapter; 4. Flange; 5. Bearing; 6. Delivery pipe; 7. Sealing shell; 8. Sealing groove; 9. Sealing ring; 10. Transition port; 11. Sealing ring; 12. Monitoring cover; 13. Extraction pipe; 14. Connecting assembly; 141. Connector; 142. Sliding sleeve; 143. Pull ring; 144. Pull rod; 145. Claw; 146. Hydraulic rod; 147. Pressure plate; 148. Sealing head; 149. Spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figure 1 and Figure 2This utility model provides an embodiment of a high-sealing rotary joint for LNG loading and unloading arms, comprising a fixed column 1, an inlet pipe 2 fixedly connected to the outside of the fixed column 1, a connector 3 provided at the end of the inlet pipe 2 away from the fixed column 1, a flange 4 fixedly connected to the outside of the connector 3, an outer ring of a bearing 5 fixedly connected to the end of the connector 3 away from the inlet pipe 2, a delivery pipe 6 fixedly connected to the inner ring of the bearing 5, the delivery pipe 6 being rotatably connected to the outside of the bearing 5, a sealing shell 7 provided on the outside of the delivery pipe 6, the sealing shell 7 being fixed to the connector 3, and a sealing groove 8 being formed inside the sealing shell 7. The part is provided with a sealing ring 9, which is set in the sealing groove 8 and closely attached to the outer peripheral surface of the conveying pipe 6. The end of the conveying pipe 6 away from the bearing 5 is fixedly connected to a transition port 10. A sealing ring 11 is provided outside the transition port 10. A monitoring cover 12 is provided outside the sealing ring 11. The monitoring cover 12 is made of quartz glass and is filled with a low-temperature fluorescent indicator. The end of the transition port 10 away from the conveying pipe 6 is fixedly connected to an extraction pipe 13. A connecting component 14 is provided at the end of the extraction pipe 13 away from the transition port 10. The sealing ring 9, sealing ring 11, and sealing head 148 are all made of perfluoroether rubber.

[0025] Specifically, first, park the transport vehicle in a suitable position near the fixed post 1. Then, pull the extraction pipe 13. With the assistance of the bearing 5, the extraction pipe 13 smoothly rotates to a suitable angle. Then, connect the extraction pipe 13 to the interface on the transport vehicle. After completing the preparation and inspection steps, open the valve. Then, LNG flows into the inlet pipe 2 through the extraction pipe 13. When the LNG flows through the rotary joint, it first passes through the transition port 10, which is connected to the extraction pipe 13. At this time, the sealing ring 11 on the outside of the transition port 10 tightly wraps the gap between the transition port 10 and the extraction pipe 13 to prevent LNG leakage. Then, it flows through the transition port 10 to the transport... Pipe 6 and bearing 5 enter the adapter 3. At this time, because the adapter 3 and the sealing shell 7 are fixedly connected to the outer ring of the bearing 5, the LNG input by the delivery pipe 6 cannot leak under the action of the sealing groove 8 and sealing ring 9 inside the sealing shell 7. Finally, it flows into the liquid inlet pipe 2 through the adapter 3. When it is necessary to extend or shorten the loading and unloading arm, the bolts of the flanges 4 at both ends can be unscrewed to remove the loading and unloading arm. When the sealing components are aged or damaged, the leaked LNG will react with the low temperature fluorescent indicator in the monitoring cover 12. The leakage situation and location can be quickly and clearly detected through the quartz monitoring cover 12 for quick and proper handling.

[0026] Reference Figure 3The connecting assembly 14 includes a connector 141, which is fixedly connected to the outside of the extraction tube 13. A sliding sleeve 142 is provided on the outside of the connector 141, which is slidably connected to the outside of the connector 141. A pull ring 143 is fixedly connected to the outside of the sliding sleeve 142. A pull rod 144 is provided inside the pull ring 143, which is rotatably connected to the inside of the pull ring 143. A pawl 145 is provided at the end of the pull rod 144 away from the pull ring 143. A hydraulic rod 146 is fixedly connected to the outside of the pawl 145. A pressure plate 147 is fixedly connected to the telescopic end of the hydraulic rod 146. A sealing head 148 is fixedly connected to the end of the connector 141 away from the extraction tube 13. A spring 149 is provided on the outside of the connector 141, between the sliding sleeve 142 and the sealing head 148.

[0027] Specifically, after the transport vehicle is parked properly, the staff adjusts the loading arm to the appropriate position so that the connecting component 14 is aligned with the corresponding interface on the transport vehicle. Then, the sliding sleeve 142 is pulled back, causing it to slide on the connector 141. The spring 149 is stretched, and at this time, the pull rod 144 inside the pull ring 143 rotates, lifting the claw 145. Then, the staff pushes the connecting component 14 forward, so that the sealing head 148 fits tightly with the interface on the transport vehicle. Then, the sliding sleeve 142 is released, the spring 149 contracts, and the sliding sleeve 142 is pulled back to its original position. The pull rod 144 rotates, pushing the claw 145 back. Then, the hydraulic rod 146 on the claw 145 extends, pressing the pressure plate 147 against the corresponding interface on the transport vehicle, so that the sealing head 148 fits tightly with the interface to prevent leakage.

[0028] Working principle: When using this device, first park the transport vehicle in a suitable position near the fixed column 1, then pull the extraction pipe 13. With the assistance of the bearing 5, the extraction pipe 13 will smoothly rotate to a suitable angle. Then connect the extraction pipe 13 to the interface on the transport vehicle. After completing the preparation and inspection steps, the valve can be opened. Then LNG flows into the liquid inlet pipe 2 along the extraction pipe 13.

[0029] When LNG flows through the rotary joint, it first passes through the transition port 10, which is connected to the extraction pipe 13. At this time, the sealing ring 11 on the outside of the transition port 10 tightly wraps the gap between the transition port 10 and the extraction pipe 13, preventing LNG leakage. Then, it flows through the transition port 10, through the delivery pipe 6 and the bearing 5, and into the adapter 3. Since the adapter 3 and the sealing shell 7 are fixedly connected to the outer ring of the bearing 5, the LNG input into the delivery pipe 6 cannot leak under the action of the sealing groove 8 and the sealing ring 9 inside the sealing shell 7. Finally, it flows into the inlet pipe 2 through the adapter 3. When it is necessary to extend or shorten the loading and unloading arm, the bolts of the flanges 4 at both ends can be unscrewed to remove the loading and unloading arm. When the sealing components are aged or damaged, the leaked LNG will react with the low-temperature fluorescent indicator in the monitoring hood 12. The quartz monitoring hood 12 can quickly and clearly detect the leakage situation and location for quick and proper handling.

[0030] After the transport vehicle is parked properly, the staff adjusts the loading arm to the appropriate position, aligning the connecting component 14 with the corresponding interface on the transport vehicle. Then, the staff pulls the sliding sleeve 142 backward, causing it to slide on the connector 141. The spring 149 extends, and at this time, the pull rod 144 inside the pull ring 143 rotates, lifting the claw 145. The staff then pushes the connecting component 14 forward, making the sealing head 148 fit tightly against the interface on the transport vehicle. The staff then releases the sliding sleeve 142, and the spring 149 contracts, pulling the sliding sleeve 142 back to its original position. The pull rod 144 rotates, pushing the claw 145 back. Then, the hydraulic rod 146 on the claw 145 extends, pressing the pressure plate 147 against the corresponding interface on the transport vehicle, making the sealing head 148 fit tightly against the interface to prevent leakage.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-sealing rotary joint for LNG loading / unloading arms, comprising a fixed column (1), characterized in that: The fixed column (1) is externally connected to an inlet pipe (2). An adapter (3) is provided at the end of the inlet pipe (2) away from the fixed column (1). A flange (4) is fixedly connected to the outside of the adapter (3). The outer ring of a bearing (5) is fixedly connected to the end of the adapter (3) away from the inlet pipe (2). A delivery pipe (6) is fixedly connected to the inner ring of the bearing (5). A sealing shell (7) is provided on the outside of the delivery pipe (6). A sealing groove is provided inside the sealing shell (7). (8) A sealing ring (9) is provided on the outside of the conveying pipe (6). A transition port (10) is fixedly connected to the end of the conveying pipe (6) away from the bearing (5). A sealing ring (11) is provided on the outside of the transition port (10). A monitoring cover (12) is provided on the outside of the sealing ring (11). An extraction pipe (13) is fixedly connected to the end of the transition port (10) away from the conveying pipe (6). A connecting component (14) is provided on the end of the extraction pipe (13) away from the transition port (10).

2. The high-sealing rotary joint for LNG loading / unloading arms according to claim 1, characterized in that: The connecting assembly (14) includes a connector (141), which is fixedly connected to the outside of the extraction tube (13). A sliding sleeve (142) is provided on the outside of the connector (141). A pull ring (143) is fixedly connected to the outside of the sliding sleeve (142). A pull rod (144) is provided inside the pull ring (143). A claw (145) is provided at the end of the pull rod (144) away from the pull ring (143). A hydraulic rod (146) is fixedly connected to the outside of the claw (145). A pressure plate (147) is fixedly connected to the telescopic end of the hydraulic rod (146). A sealing head (148) is fixedly connected to the end of the connector (141) away from the extraction tube (13). A spring (149) is provided on the outside of the connector (141).

3. A high-sealing rotary joint for LNG loading / unloading arms according to claim 2, characterized in that: The sliding sleeve (142) is slidably connected to the outside of the connector (141), and the pull rod (144) is rotatably connected to the inside of the pull ring (143).

4. A high-sealing rotary joint for LNG loading / unloading arms according to claim 2, characterized in that: The spring (149) is disposed outside the connector (141), between the sliding sleeve (142) and the sealing head (148).

5. A high-sealing rotary joint for LNG loading / unloading arms according to claim 1, characterized in that: The sealing shell (7) is fixed to the adapter (3), and the delivery pipe (6) is rotatably connected to the outside of the bearing (5).

6. A high-sealing rotary joint for LNG loading / unloading arms according to claim 1, characterized in that: The sealing ring (9) is disposed in the sealing groove (8) and closely adheres to the outer peripheral surface of the conveying pipe (6).

7. A high-sealing rotary joint for LNG loading / unloading arms according to claim 1, characterized in that: The monitoring cover (12) is made of quartz glass, and the interior of the monitoring cover (12) is filled with a low-temperature fluorescent indicator.

8. A high-sealing rotary joint for LNG loading / unloading arms according to claim 1, characterized in that: The sealing ring (9), sealing ring (11), and sealing head (148) are all made of perfluoroether rubber.

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