Leakproof rotary joint with pressure relief

Abstract

The utility model discloses a kind of leakproof rotary joint with pressure relief function, including rotary seat body, rotary seat body is equipped with rotary joint body, sealing assembly is equipped between rotary seat body and rotary joint body, sealing assembly includes sealing dynamic ring, sealing static ring and compression spring, sealing dynamic ring and sealing static ring are adjacent arrangement, compression spring is abutted on sealing static ring;Sealing cavity is equipped between rotary seat body and rotary joint body, sealing cavity is equipped with pressure relief hole between rotary seat body, and rotary seat body is equipped with the pressure relief valve of communication arrangement with pressure relief hole;The opening end of rotary seat body is equipped with anti-leakage assembly, and anti-leakage assembly includes labyrinth bearing end cover, axial seal and radial seal.The utility model is equipped with pressure relief valve in sealing cavity, to automatically adjust internal pressure of cavity;Leakage-proof assembly is set in the opening end of rotary seat body, to avoid fluid overflow;By limiting sealing static ring, the mutual abrasion of sealing static ring and sealing dynamic ring is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of rotary joints, specifically relating to a leak-proof rotary joint with pressure relief function. Background Technology

[0002] Rotary joints are commonly used in liquid transportation. Existing rotary joints typically include a base and a connector, with the connector rotating relative to the base. A bearing is located between the connector and the base. Patent CN219606333U discloses a rotary joint for fluid transportation, comprising a first end cap, a central sleeve, and a second end cap, movably connected from right to left. An inner rolling ring and an outer rolling ring are sequentially fitted onto the outer side of the central sleeve from the inside out. The right end of the inner rolling ring is fixed to the first end cap with a fixing screw, and the left end of the outer rolling ring is fixed to the second end cap with a fixing screw. In existing rotary joints, during fluid transportation, there is mutual wear between the sealing dynamic ring and the sealing stationary ring. The fluid flows between the sealing dynamic ring and the sealing stationary ring under pressure, and the fluid pressure accumulates within the closed cavity. This fluid pressure causes the fluid to flow outwards from the inside of the bearing end cap along the bearing clearance, squeezing out the lubricating oil from the bearing. Long-term use can lead to dry friction due to insufficient lubrication in the bearing, and external contamination from oil stains, thus affecting the overall service life of the rotary joint. Therefore, a leak-proof rotary joint with pressure relief function needs to be designed to overcome the above difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a leak-proof rotary joint with pressure relief function. The invention includes a pressure relief valve in the sealed cavity to automatically regulate the internal pressure of the cavity; a leak-proof component is installed at the opening end of the rotary seat to prevent fluid overflow; and mutual wear between the sealing stationary ring and the sealing rotating ring is reduced by limiting the position of the sealing stationary ring.

[0004] The objective of this invention is achieved through the following technical solution: a leak-proof rotary joint with pressure relief function, comprising a rotary seat, a rotary joint body rotatably connected thereto on the rotary seat, a sealing assembly between the rotary seat and the rotary joint body, the sealing assembly comprising a sealing rotating ring, a sealing stationary ring and a compression spring, the sealing rotating ring and the sealing stationary ring being arranged adjacent to each other, the compression spring abutting against the sealing stationary ring; a sealing cavity is provided between the rotary seat and the rotary joint body, a pressure relief hole is provided between the sealing cavity and the rotary seat, a pressure relief valve communicating with the pressure relief hole is provided on the rotary seat; a leak-proof assembly is provided at the open end of the rotary seat, the leak-proof assembly comprising a labyrinth bearing end cap, an axial seal and a radial seal.

[0005] Preferably, a pair of bearing bodies are provided between the rotary joint body and the rotary seat, with the two bearing bodies arranged side by side, one above the other; the bottom of the sealing ring abuts against the top of the rotary joint body, one end of the compression spring abuts against the step of the rotary seat, and the other end of the compression spring abuts against the step of the sealing ring.

[0006] Preferably, a labyrinth bearing end cap is fixedly installed at the open end of the rotating seat, and the labyrinth bearing end cap is fixedly connected to the rotating seat by fasteners; the labyrinth bearing end cap is fitted with the bearing body below, and a retaining spring is installed on the rotating joint body, and the retaining spring is fitted with the bearing body above.

[0007] By setting a labyrinth-type bearing end cap, the bearing body is axially limited. By setting a retaining ring, the rotary joint body is axially limited. In this way, the rotary joint body and the bearing body can be firmly installed in the rotary seat.

[0008] Preferably, the sealing assembly further includes a guide post and a hole sealing ring; the sealing stationary ring is disposed in the rotating seat body, the sealing moving ring is disposed adjacent to the sealing stationary ring, a hole sealing ring is provided between the sealing stationary ring and the rotating seat body to seal both, and a guide post is fixedly installed on the sealing stationary ring.

[0009] Preferably, the rotating seat body is provided with a limiting guide groove along its bearing, and the limiting guide groove is in communication with the sealing cavity; the guide post is slidably installed in the limiting guide groove, and the outer contour of the guide post is adapted to the outer contour of the limiting guide groove.

[0010] Preferably, the bottom of the sealing ring abuts against the rotary joint body, and the sealing ring can rotate relative to the rotary joint body; a sealing stationary ring is provided on the upper end face of the sealing ring, and a compression spring is provided on the top of the sealing stationary ring, with the top of the compression spring abutting against the step of the rotary seat.

[0011] Preferably, both the stationary sealing ring and the moving sealing ring are hollow.

[0012] By setting guide posts and limiting guide grooves, the stationary sealing ring is limited, restricting its circumferential rotation and reducing relative wear between the stationary and rotating sealing rings. Simultaneously, the stationary and rotating sealing rings are arranged adjacent to each other, and a compression spring compresses the stationary sealing ring, ensuring a tight fit and better sealing, preventing leakage of media from the pipeline into the sealing cavity.

[0013] Preferably, the rotating base is provided with a material outlet, the rotating joint body is provided with a material inlet, and the material inlet and the material outlet are interconnected; the pressure relief hole is connected to the sealing cavity, and the pressure relief hole is located close to the anti-leakage component.

[0014] When the fluid medium is transferred, the pressure inside the sealed cavity will change; when the pressure inside the sealed cavity exceeds the set pressure of the pressure relief valve, the pressure relief valve can automatically open to release pressure; here, by observing the working status of the pressure relief valve, the wear and leakage status of the sealing stationary ring and the sealing rotating ring is detected, thereby determining whether the sealing stationary ring and the sealing rotating ring need to be replaced.

[0015] Preferably, the leak-proof assembly further includes a sealing groove, in which an axial seal is provided, the axial seal being disposed between the labyrinth bearing end cap and the rotary joint body; a radial seal is disposed on the outer layer of the axial seal, the radial seal being disposed between the labyrinth bearing end cap and the rotary seat; a bearing body is disposed between the rotary joint bodies, the labyrinth bearing end cap is fitted to the bearing body, and the radial seal is disposed adjacent to the bearing body.

[0016] The labyrinth bearing end cap is doubly sealed by radial and axial seals, blocking leakage paths, preventing bearing lubricant leakage, and avoiding dry running of the bearing body due to lack of oil. This greatly improves the product's service life and makes it safer and more reliable to use.

[0017] Compared with the prior art, this utility model has the following beneficial effects: 1. A pressure relief valve connected to the sealing cavity is provided on the side of the rotating seat, which facilitates automatic adjustment of the pressure in the sealing cavity, thereby avoiding excessive pressure and reducing the risk of bearing lubricating oil leakage under high pressure; 2. By limiting the sealing stationary ring, excessive wear between the sealing stationary ring and the sealing rotating ring is avoided, thus ensuring better sealing between the sealing stationary ring and the sealing rotating ring and preventing media leakage in the pipeline; 3. The labyrinth bearing end cover is double-sealed by radial and axial seals, resulting in better overall sealing of the anti-leakage assembly; preventing bearing lubricating oil leakage and avoiding the condition of dry running due to lack of oil in the bearing body, greatly improving the service life of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external appearance of the present utility model;

[0019] Figure 2 This is a bottom view of the present invention;

[0020] Figure 3 This is a diagram of the internal structure of the present invention;

[0021] Figure 4 forFigure 3 A magnified view of a portion of position A in the middle;

[0022] The markings in the diagram are: 1. Rotary seat; 2. Rotary joint body; 3. Sealing assembly; 31. Sealing ring; 32. Sealing ring; 33. Compression spring; 34. Guide post; 35. Hole sealing ring; 4. Sealing cavity; 5. Pressure relief hole; 6. Pressure relief valve; 7. Leakage prevention assembly; 71. Labyrinth bearing end cap; 72. Axial seal; 73. Radial seal; 74. Sealing slot; 8. Bearing body; 9. Fastener; 10. Snap ring; 11. Limiting guide groove; 12. Material outlet; 13. Material inlet. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0024] like Figures 1 to 4 As shown, this embodiment discloses a leak-proof rotary joint with pressure relief function, including a rotary seat 1, a rotary joint body 2 rotatably connected to the rotary seat 1, a sealing assembly 3 between the rotary seat 1 and the rotary joint body 2, the sealing assembly 3 including a sealing moving ring 31, a sealing stationary ring 32 and a compression spring 33, the sealing moving ring 31 and the sealing stationary ring 32 being arranged adjacent to each other, and the compression spring 33 abutting against the sealing stationary ring 32; a sealing cavity 4 is provided between the rotary seat 1 and the rotary joint body 2, a pressure relief hole 5 is provided between the sealing cavity 4 and the rotary seat 1, and a pressure relief valve 6 communicating with the pressure relief hole 5 is provided on the rotary seat 1; a leak-proof assembly 7 is provided at the open end of the rotary seat 1, the leak-proof assembly 7 including a labyrinth bearing end cap 71, an axial seal 72 and a radial seal 73.

[0025] A pair of bearing bodies 8 are provided between the rotary joint body 2 and the rotary seat 1, with the two bearing bodies 8 arranged side by side, one above the other. The bottom of the sealing moving ring 31 abuts against the top of the rotary joint body 2, one end of the compression spring 33 abuts against the step of the rotary seat 1, and the other end of the compression spring 33 abuts against the step of the sealing stationary ring 32. A labyrinth bearing end cap 71 is fixedly installed at the open end of the rotary seat 1, and the labyrinth bearing end cap 71 is fixedly connected to the rotary seat 1 by fasteners 9. The labyrinth bearing end cap 71 is fitted with the bearing body 8 below it, and a retaining spring 10 is installed on the rotary joint body 2, which is fitted with the bearing body 8 above it.

[0026] The sealing assembly 3 further includes a guide post 34 and a hole sealing ring 35; the sealing stationary ring 32 is disposed inside the rotating base 1, the sealing moving ring 31 is disposed adjacent to the sealing stationary ring 32, and a hole sealing ring 35 is provided between the sealing stationary ring 32 and the rotating base 1 to seal both; the guide post 34 is fixedly installed on the sealing stationary ring 32. The rotating base 1 is provided with a limiting guide groove 11 along its bearing, and the limiting guide groove 11 communicates with the sealing cavity 4; the guide post 34 is slidably installed in the limiting guide groove 11, and the outer contour of the guide post 34 is adapted to the outer contour of the limiting guide groove 11. The bottom of the sealing moving ring 31 abuts against the rotary joint body 2, and the sealing moving ring 31 can rotate relative to the rotary joint body 2; the upper end face of the sealing moving ring 31 is provided with a sealing stationary ring 32, and the top of the sealing stationary ring 32 is provided with a compression spring 33, the top of the compression spring 33 abuts against the step of the rotating base 1. Both the stationary sealing ring 32 and the moving sealing ring 31 are hollow.

[0027] The rotating base 1 is provided with a material outlet 12, and the rotating joint body 2 is provided with a material inlet 13, which communicates with the material outlet 12. The pressure relief hole 5 communicates with the sealing cavity 4 and is located near the anti-leakage component 7. The anti-leakage component 7 also includes a sealing groove 74, in which an axial seal 72 is provided, which is located between the labyrinth bearing end cap 71 and the rotating joint body 2. A radial seal 73 is located on the outer layer of the axial seal 72, which is located between the labyrinth bearing end cap 71 and the rotating base 1. A bearing body 8 is provided between the rotating joint bodies 2, with the labyrinth bearing end cap 71 fitted to the bearing body 8, and the radial seal 73 adjacent to the bearing body 8.

[0028] The specific operation process of this embodiment is as follows: by setting the labyrinth bearing end cover 71, the bearing body 8 is axially limited; by setting the snap ring 10, the rotary joint body 2 is axially limited. In this way, the rotary joint body 2 and the bearing body 8 can be firmly installed in the rotary seat.

[0029] By setting the guide post 34 and the limiting guide groove 11, the sealing stationary ring 32 is limited, restricting its circumferential rotation and thus reducing the relative wear between the sealing stationary ring 32 and the sealing rotating ring 31. Simultaneously, the sealing stationary ring 32 and the sealing rotating ring 31 are arranged adjacent to each other, and the sealing stationary ring 32 is compressed by the compression spring 33, allowing them to fit tightly together and providing better sealing, preventing the medium in the pipeline from leaking into the sealing cavity 4.

[0030] When the fluid medium is transferred, the pressure inside the sealing cavity 4 will change; when the pressure inside the sealing cavity 4 exceeds the set pressure of the pressure relief valve 6, the pressure relief valve 6 can automatically open to relieve pressure; here, by observing the working state of the pressure relief valve 6, the wear and leakage state of the sealing stationary ring 32 and the sealing dynamic ring 31 can be detected, thereby determining whether the sealing stationary ring 32 and the sealing dynamic ring 31 need to be replaced.

[0031] The labyrinth bearing end cover 71 is doubly sealed by radial seal 73 and axial seal 72, blocking the leakage path, preventing the bearing lubricating oil from leaking out, and avoiding the condition of dry running due to lack of oil in the bearing body 8; this greatly improves the service life of the product and makes it safer and more reliable to use.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A leak-proof rotary joint with pressure relief function, comprising a rotary seat (1), wherein a rotary joint body (2) is provided on the rotary seat (1) and rotatably connected thereto, characterized in that, A sealing assembly (3) is provided between the rotating seat (1) and the rotating joint body (2). The sealing assembly (3) includes a sealing moving ring (31), a sealing stationary ring (32), and a compression spring (33). The sealing moving ring (31) and the sealing stationary ring (32) are arranged adjacent to each other, and the compression spring (33) abuts against the sealing stationary ring (32). A sealing cavity (4) is provided between the rotating seat (1) and the rotating joint body (2). A pressure relief hole (5) is provided between the sealing cavity (4) and the rotating seat (1). A pressure relief valve (6) is provided on the rotating seat (1) and communicates with the pressure relief hole (5). A leak-proof assembly (7) is provided at the open end of the rotating seat (1). The leak-proof assembly (7) includes a labyrinth bearing end cap (71), an axial seal (72), and a radial seal (73).

2. The leak-proof rotary joint with pressure relief function according to claim 1, characterized in that, A pair of bearing bodies (8) are provided between the rotary joint body (2) and the rotary seat (1), with the two bearing bodies (8) arranged side by side. The bottom of the sealing ring (31) abuts against the top of the rotary joint body (2), one end of the compression spring (33) abuts against the step of the rotary seat (1), and the other end of the compression spring (33) abuts against the step of the sealing ring (32).

3. The leak-proof rotary joint with pressure relief function according to claim 2, characterized in that, A labyrinth bearing end cap (71) is fixedly installed at the open end of the rotating seat (1), and the labyrinth bearing end cap (71) is fixedly connected to the rotating seat (1) by fasteners (9); the labyrinth bearing end cap (71) is fitted with the bearing body (8) below, and a snap ring (10) is installed on the rotating joint body (2), and the snap ring (10) is fitted with the bearing body (8) above.

4. The leak-proof rotary joint with pressure relief function according to claim 1, characterized in that, The sealing assembly (3) further includes a guide post (34) and a hole sealing ring (35); the sealing stationary ring (32) is disposed inside the rotating seat (1), the sealing moving ring (31) is disposed adjacent to the sealing stationary ring (32), and a hole sealing ring (35) is provided between the sealing stationary ring (32) and the rotating seat (1) to seal both of them, and the guide post (34) is fixedly installed on the sealing stationary ring (32).

5. The leak-proof rotary joint with pressure relief function according to claim 4, characterized in that, The rotating seat (1) is provided with a limiting guide groove (11) along its bearing, and the limiting guide groove (11) is connected to the sealing cavity (4); the guide post (34) is slidably installed in the limiting guide groove (11), and the outer contour of the guide post (34) is adapted to the outer contour of the limiting guide groove (11).

6. The leak-proof rotary joint with pressure relief function according to claim 4, characterized in that, The bottom of the sealing ring (31) abuts against the rotary joint body (2), and the sealing ring (31) can rotate relative to the rotary joint body (2); a sealing stationary ring (32) is provided on the upper end face of the sealing ring (31), and a compression spring (33) is provided on the top of the sealing stationary ring (32), and the top of the compression spring (33) abuts against the step of the rotary seat (1).

7. The leak-proof rotary joint with pressure relief function according to claim 4, characterized in that, Both the stationary sealing ring (32) and the moving sealing ring (31) are hollow.

8. The leak-proof rotary joint with pressure relief function according to claim 1, characterized in that, The rotating seat (1) is provided with a material outlet (12), and the rotating joint body (2) is provided with a material inlet (13). The material inlet (13) and the material outlet (12) are interconnected. The pressure relief hole (5) is connected to the sealing cavity (4), and the pressure relief hole (5) is located near the anti-leakage component (7).

9. The leak-proof rotary joint with pressure relief function according to claim 1, characterized in that, The leak-proof assembly (7) also includes a sealing groove (74), in which an axial seal (72) is provided, which is disposed between the labyrinth bearing end cap (71) and the rotary joint body (2); a radial seal (73) is disposed on the outer layer of the axial seal (72), which is disposed between the labyrinth bearing end cap (71) and the rotary seat (1); a bearing body (8) is provided between the rotary joint body (2), the labyrinth bearing end cap (71) and the bearing body (8) are fitted together, and the radial seal (73) and the bearing body (8) are adjacent to each other.

Images