A cryogenic rotary joint with a built-in pressure balancing mechanism

Abstract

This utility model relates to the field of mechanical engineering technology and discloses a low-temperature rotary joint with a built-in pressure balancing mechanism. It includes a feed pipe, to which a conveying pipe is fixedly connected. A bearing is installed inside the conveying pipe, and a discharge pipe is fixedly connected to the inner ring of the bearing. A pressure relief cylinder is fixedly connected to the end of the conveying pipe away from the bearing. A spring is installed inside the pressure relief cylinder, and a pressure relief pipe is fixedly connected to the outside of the cylinder. A pressure relief valve is installed outside the pressure relief pipe, and a gas cylinder is fixedly connected to the end of the pressure relief pipe away from the cylinder. In this utility model, through the cooperation of the piston, spring, and pressure relief cylinder, when the pressure of the transported material changes, the volume of the conveying pipe can be increased by the sliding of the piston, achieving pressure balancing. Furthermore, when the pressure exceeds the normal range, the material can be promptly discharged through the pressure relief pipe and gas cylinder, preventing safety accidents and ensuring the safety of personnel and equipment.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and in particular to a low-temperature rotary joint with a built-in pressure balancing mechanism. Background Technology

[0002] Cryogenic rotary joints are core components connecting fixed cryogenic fluid pipelines to rotating equipment. They enable sealed fluid transmission in extreme low-temperature environments while allowing equipment rotation. Their significance lies in preventing safety hazards and cold energy loss caused by cryogenic fluid leakage, ensuring continuous and stable operation of rotating equipment, and are widely used in aerospace, medical, and cold chain industries. They are key components in cryogenic systems that ensure fluid transmission efficiency and equipment reliability.

[0003] Traditional cryogenic rotary joints mainly consist of a rotating shaft, a fixed housing, seals, bearings, and a flow channel. The fixed housing is connected to the cryogenic fluid pipeline, and the rotating shaft is connected to the rotating parts of the equipment. When the equipment is running, the rotating shaft drives the seals to dynamically fit against the housing, which not only prevents fluid leakage but also enables stable transmission of cryogenic fluid between the fixed and rotating parts through the internal flow channel. The bearings reduce rotational friction to ensure smooth operation.

[0004] However, traditional cryogenic rotary joints usually lack pressure balancing capabilities, which can easily lead to seal failure and leakage, causing safety accidents, unstable fluid transmission, abnormal equipment operation, uneven stress on components, and shortened service life. Furthermore, leaks caused by aging seals in traditional cryogenic rotary joints can only be detected through low-temperature frosting, fluid odor, and abnormal equipment vibration, posing significant safety hazards.

[0005] Therefore, a cryogenic rotary joint with a built-in pressure balancing mechanism 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 low-temperature rotary joint with a built-in pressure balancing mechanism, which aims to improve the problems of the lack of pressure balancing capability and the difficulty in detecting leaks in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature rotary joint with a built-in pressure balancing mechanism, comprising a feed pipe, a conveying pipe fixedly connected to the outside of the feed pipe, a bearing disposed inside the conveying pipe, a discharge pipe fixedly connected to the inner ring of the bearing, a sealing ring disposed outside the discharge pipe, an alarm component disposed outside the discharge pipe, a pressure relief cylinder fixedly connected to the end of the conveying pipe away from the bearing, a spring disposed inside the pressure relief cylinder, a piston fixedly connected to the end of the spring away from the pressure relief cylinder, an air hole opened inside the piston, a pressure relief hole opened inside the pressure relief cylinder, a pressure relief pipe fixedly connected to the outside of the pressure relief cylinder, a pressure relief valve disposed outside the pressure relief pipe, a gas cylinder fixedly connected to the end of the pressure relief pipe away from the pressure relief cylinder, and a pressure gauge installed on the top of the gas cylinder.

[0008] Furthermore, the alarm component includes a protective cover disposed outside the discharge pipe, a sealing ring disposed inside the protective cover, an airbag disposed inside the protective cover, an air pipe fixedly connected to the outside of the airbag, and an alarm fixedly connected to the end of the air pipe away from the airbag.

[0009] Furthermore, the discharge pipe is rotatably connected inside the protective cover.

[0010] Furthermore, the outer ring of the bearing is fixed inside the feed pipe, and its inner ring is fixed outside the discharge pipe.

[0011] Furthermore, the sealing ring is rotatably connected inside the conveying pipe and rotatably connected outside the discharge pipe.

[0012] Furthermore, the piston is slidably connected inside the pressure relief cylinder.

[0013] Furthermore, the pressure relief valve is connected to the outside of the pressure relief pipe via a flange.

[0014] Furthermore, the air vent is aligned with and connected to the pressure relief vent on the pressure relief cylinder.

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

[0016] 1. In this utility model, through the cooperation of piston, spring and pressure relief cylinder, when the pressure of the transported material changes, the volume of the conveying pipe can be increased by the sliding of the piston to achieve the purpose of pressure balance. Moreover, when the pressure exceeds the normal range, the material can be discharged in time through the pressure relief pipe and gas cylinder to avoid safety accidents and ensure the safety of users and equipment.

[0017] 2. In this utility model, the design of the alarm component can prevent further leakage of materials immediately when the sealing ring fails, and issue an alarm in time to remind the staff to deal with it quickly. Compared with the traditional low temperature rotary joint, it can provide timely warning of risks, reduce losses, and protect the stable operation of the equipment. Attached Figure Description

[0018] Figure 1 A perspective view of a low-temperature rotary joint with a built-in pressure balancing mechanism proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the rotating structure of a low-temperature rotary joint with a built-in pressure balancing mechanism proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the pressure balance structure of a low-temperature rotary joint with a built-in pressure balance mechanism proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the alarm component structure of a low-temperature rotary joint with a built-in pressure balancing mechanism proposed in this utility model.

[0022] Legend:

[0023] 1. Feed pipe; 2. Conveying pipe; 3. Bearing; 4. Discharge pipe; 5. Sealing ring; 6. Alarm assembly; 61. Protective cover; 62. Sealing ring; 63. Airbag; 64. Air pipe; 65. Alarm; 7. Pressure relief cylinder; 8. Piston; 9. Spring; 10. Air hole; 11. Pressure relief hole; 12. Pressure relief pipe; 13. Pressure relief valve; 14. Gas cylinder; 15. Pressure gauge. Detailed Implementation

[0024] 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.

[0025] Reference Figures 1-3This utility model provides an embodiment of a low-temperature rotary joint with a built-in pressure balancing mechanism, comprising a feed pipe 1, a conveying pipe 2 fixedly connected to the outside of the feed pipe 1, a bearing 3 disposed inside the conveying pipe 2, an outlet pipe 4 fixedly connected to the inner ring of the bearing 3, an outer ring of the bearing 3 fixed inside the conveying pipe 2, and an inner ring fixed outside the outlet pipe 4. A sealing ring 5 is disposed outside the outlet pipe 4, rotatably connected to both the outside and inside of the conveying pipe 2. An alarm component 6 is disposed outside the outlet pipe 4. A pressure relief cylinder is fixedly connected to the end of the conveying pipe 2 away from the bearing 3. 7. A spring 9 is installed inside the pressure relief cylinder 7. A piston 8 is fixedly connected to the end of the spring 9 away from the pressure relief cylinder 7. The piston 8 is slidably connected inside the pressure relief cylinder 7. An air hole 10 is opened inside the piston 8. The air hole 10 is aligned with and connected to the pressure relief hole 11 on the pressure relief cylinder 7. A pressure relief pipe 12 is fixedly connected to the outside of the pressure relief cylinder 7. A pressure relief valve 13 is installed outside the pressure relief pipe 12. The pressure relief valve 13 is connected to the outside of the pressure relief pipe 12 through a flange. A gas cylinder 14 is fixedly connected to the end of the pressure relief pipe 12 away from the pressure relief cylinder 7. A pressure gauge 15 is installed on the top of the gas cylinder 14.

[0026] Specifically, the feed pipe 1 is connected to the device to be fed, and the discharge pipe 4 is rotated to a suitable position via the bearing 3. The discharge pipe 4 is then connected to the device to be discharged. The discharge device is then opened, allowing the material to be transported to flow through the discharge pipe 4 into the conveying pipe 2, and then through the feed pipe 1 into the storage device. The sealing ring 5 prevents material leakage from the connection between the conveying pipe 2 and the discharge pipe 4. When transporting materials subject to pressure changes, the pressure relief pipe 12 is connected to the pressure relief valve 13 and the gas cylinder 14 via a flange. When the pressure of the transported material changes... When a change occurs, the pressure inside the conveying pipe 2 increases, pushing the piston 8 backward. The spring 9 contracts, increasing the volume of the conveying pipe 2 to balance the pressure inside the pipe. When the spring 9 contracts to its limit, the air hole 10 on the piston 8 aligns with the pressure relief hole 11 on the pressure relief cylinder 7. Excess material can flow into the pressure relief pipe 12 through the air hole 10, opening the pressure relief valve 13. The material is pushed into the gas cylinder 14 by the pressure. The pressure gauge 15 on the gas cylinder 14 monitors the gas pressure inside the gas cylinder 14 in real time to prevent excessive pressure from damaging the gas cylinder 14.

[0027] Reference Figure 4 The alarm component 6 includes a protective cover 61, which is disposed outside the discharge pipe 4. The discharge pipe 4 is rotatably connected to the inside of the protective cover 61. A sealing ring 62 is disposed inside the protective cover 61. An airbag 63 is disposed inside the protective cover 61. An air pipe 64 is fixedly connected to the outside of the airbag 63. An alarm 65 is fixedly connected to the end of the air pipe 64 away from the airbag 63.

[0028] Specifically, when the equipment has been used for a long time or improper operation causes the sealing ring 5 to age and break, the sealing performance of the sealing ring 5 will decrease, causing material to leak from the bearing 3 and flow into the protective cover 61. The sealing ring 62 inside the protective cover 61 prevents further leakage of material, and the airbag 63 is squeezed by the leaked material, which squeezes out the gas inside the airbag 63. The squeezed gas enters the alarm 65 through the air pipe 64 and is detected by the alarm 65. Then the alarm 65 starts to sound, reminding the staff that a leak has occurred.

[0029] Working principle: When using this device, connect the feed pipe 1 to the device to be fed, rotate the discharge pipe 4 to the appropriate position through the bearing 3, connect the discharge pipe 4 to the device to be discharged, and then open the discharge device to allow the material to be transferred to flow into the conveying pipe 2 through the discharge pipe 4, and then flow into the storage device through the feed pipe 1. The sealing ring 5 prevents the material from leaking from the connection between the conveying pipe 2 and the discharge pipe 4.

[0030] When it is necessary to transport materials that will experience pressure changes, the pressure relief pipe 12 is connected to the pressure relief valve 13 and the gas cylinder 14 through the flange. When the pressure of the transported material changes, the pressure in the conveying pipe 2 increases, pushing the piston 8 backward and the spring 9 contracts, thereby increasing the volume of the conveying pipe 2 to balance the pressure in the pipe.

[0031] When the spring 9 is contracted to its limit, the air hole 10 on the piston 8 is aligned with the pressure relief hole 11 on the pressure relief cylinder 7. Excess material can flow into the pressure relief pipe 12 through the air hole 10. The pressure relief valve 13 is opened, and the material is pushed into the gas cylinder 14 by pressure. The pressure gauge 15 on the gas cylinder 14 monitors the gas pressure in the gas cylinder 14 in real time to prevent excessive gas pressure from damaging the gas cylinder 14.

[0032] When the equipment has been used for a long time or improper operation causes the sealing ring 5 to age and break, the sealing performance of the sealing ring 5 will decrease, causing material to leak from the bearing 3 and flow into the protective cover 61. The sealing ring 62 inside the protective cover 61 prevents further leakage of material, and the airbag 63 is squeezed by the leaked material, which squeezes out the gas inside the airbag 63. The squeezed gas enters the alarm 65 through the air pipe 64 and is detected by the alarm 65. Then the alarm 65 starts to sound, reminding the staff that a leak has occurred.

[0033] 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 cryogenic rotary joint with a built-in pressure balancing mechanism, comprising a feed pipe (1), characterized in that: The feed pipe (1) is fixedly connected to the outside of the conveying pipe (2). The inside of the conveying pipe (2) is a bearing (3). The inner ring of the bearing (3) is fixedly connected to the discharge pipe (4). The outside of the discharge pipe (4) is a sealing ring (5). The outside of the discharge pipe (4) is an alarm component (6). The end of the conveying pipe (2) away from the bearing (3) is fixedly connected to a pressure relief cylinder (7). The inside of the pressure relief cylinder (7) is a spring (9). A piston (8) is fixedly connected to the end away from the pressure relief cylinder (7). An air hole (10) is opened inside the piston (8). A pressure relief hole (11) is opened inside the pressure relief cylinder (7). A pressure relief pipe (12) is fixedly connected to the outside of the pressure relief cylinder (7). A pressure relief valve (13) is provided on the outside of the pressure relief pipe (12). A gas cylinder (14) is fixedly connected to the end of the pressure relief pipe (12) away from the pressure relief cylinder (7). A pressure gauge (15) is installed on the top of the gas cylinder (14).

2. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The alarm component (6) includes a protective cover (61) which is disposed outside the discharge pipe (4). A sealing ring (62) is disposed inside the protective cover (61). An airbag (63) is disposed inside the protective cover (61). An air pipe (64) is fixedly connected to the outside of the airbag (63). An alarm (65) is fixedly connected to the end of the air pipe (64) away from the airbag (63).

3. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 2, characterized in that: The discharge pipe (4) is rotatably connected inside the protective cover (61).

4. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The outer ring of the bearing (3) is fixed inside the conveying pipe (2), and its inner ring is fixed outside the discharge pipe (4).

5. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The sealing ring (5) is rotatably connected inside the conveying pipe (2) and rotatably connected outside the discharge pipe (4).

6. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The piston (8) is slidably connected inside the pressure relief cylinder (7).

7. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The pressure relief valve (13) is connected to the outside of the pressure relief pipe (12) via a flange.

8. A cryogenic rotary joint with a built-in pressure balancing mechanism according to claim 1, characterized in that: The air hole (10) is aligned with and connected to the pressure relief hole (11) on the pressure relief cylinder (7).

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