Swivel joint leak protection method

Abstract

The application discloses a rotary joint anti-leakage method, which comprises the following steps: arranging sealing rings one above and below the alignment and communication between the outlet of the dynamic backwater flow channel and the backwater annular groove, and arranging sealing rings one above and below the alignment and communication between the inlet of the water flow channel and the outlet of the static backwater flow channel; a leakage collection annular groove is arranged on the inner wall of the fixed shell and located above and / or below the sealing ring one, a drainage flow channel is arranged in the fixed shell, and the leakage collection annular groove is communicated with one end of the drainage flow channel; the leakage collection annular groove is used for collecting the leaked water when the sealing ring one fails to seal, and the water is drained out of the fixed shell through the drainage flow channel. The multiple sealing rings arranged between the fixed shell and the rotating inner shaft have good sealing performance, the leakage collection annular groove and the drainage flow channel are arranged, the leakage collection annular groove can collect the leaked water when the sealing ring fails to seal, and the rotary joint can automatically drain out the water through the drainage flow channel on the fixed shell when the leakage reaches a certain amount.

Description

Technical Field

[0001] This invention relates to the field of engineering, specifically to a method for preventing water leakage in rotary joints, thereby improving the leakage problem of existing rotary joints. Background Technology

[0002] During operation, large cranes require the supply of cooling water to cool the machine (such as the boom). This is achieved by an external water source supplying cooling water to the boom via a rotary joint. The rotary joint is a mechanical connection component that delivers cooling water without hindering the boom's free rotation. The cooling water required for the boom's operation must be transferred through this rotary joint.

[0003] Existing similar patents, such as CN219282683U which describes a rotary joint for high-altitude operations of fire trucks, and CN219218983U which describes a rotary joint that is easy to process, still exhibit problems after prolonged use. These rotary joints may leak water or oil due to wear and aging of the sealing rings, affecting the circuitry in the machine connected to the rotary joint and causing damage to the overall mechanical structure.

[0004] Therefore, it is necessary to study a method for preventing water leakage from rotary joints. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preventing water leakage in a rotary joint, which addresses the shortcomings of the prior art. This method for preventing water leakage in a rotary joint is achieved by providing multiple sealing rings between the fixed outer shell and the rotating inner shaft, which ensures good sealing performance at the location where the sealing rings are set. In addition, a leakage collection annular groove and a drainage channel are provided. The leakage collection annular groove can collect leaked water when the sealing rings fail, and automatically discharge the leaked water from the rotary joint through the drainage channel on the fixed outer shell when a certain amount of leakage is reached. This further prevents water leakage in the flow channel of the rotary joint from affecting the circuit in the machine connected to the rotary joint, thereby avoiding the problem of leakage affecting the operation of the machine.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for preventing water leakage from a rotary joint includes a rotary joint, which comprises a fixed outer shell and a rotating inner shaft that are rotatably connected.

[0008] The fixed housing has a static water inlet channel, a return water channel, and a return water annular groove inside; the lower surface of the fixed housing has a static water inlet channel inlet and a static return water channel outlet, and the inner wall of the fixed housing has a static water inlet channel outlet; wherein, the return water annular groove, the return water channel, and the static return water channel outlet are connected, and the static water inlet channel outlet, the static water inlet channel, and the static water inlet channel inlet are connected.

[0009] The rotating inner shaft has a moving return water channel, a moving inlet water channel, and an inlet annular groove inside; the upper surface of the rotating inner shaft has a moving return water channel inlet and a moving inlet water channel outlet; the inner wall of the rotating inner shaft has a moving return water channel outlet, wherein the moving return water channel inlet, the moving return water channel, and the moving return water channel outlet are connected; the moving return water channel outlet is aligned and connected with the return water annular groove; the moving inlet water channel outlet, the moving inlet water channel, and the inlet annular groove are connected; the inlet annular groove is connected with the static inlet water channel outlet;

[0010] Leak prevention methods include:

[0011] A sealing ring is provided above and below the outlet of the dynamic return water channel that is aligned and connected with the return water annular groove. A sealing ring is also provided above and below the inlet annular groove that is aligned and connected with the outlet of the static inlet water channel. The sealing ring is located between the rotating inner shaft and the fixed outer shell.

[0012] A collection annular groove is provided on the inner wall of the fixed housing. The collection annular groove is located above and / or below the sealing ring. A drainage channel is provided inside the fixed housing. One end of the collection annular groove is connected to the drainage channel.

[0013] The annular groove is used to collect water that leaks out when the seal fails and allows it to flow out of the fixed housing through the drain channel.

[0014] As a further improvement of the present invention, the static water inlet channel includes an axial static water inlet channel and a radial static water inlet channel; the static water inlet channel outlet, the radial static water inlet channel, the static water inlet channel and the static water inlet channel are connected.

[0015] The return water channel is an axial static return water channel, and the return water annular groove, the axial static return water channel and the static return water channel outlet are connected.

[0016] The dynamic return water channel includes a radial dynamic return water channel and an axial dynamic return water channel, and the dynamic return water channel inlet, the axial dynamic return water channel, the radial dynamic return water channel and the dynamic return water channel outlet are connected.

[0017] The moving water inlet channel is an axial moving water inlet channel, and the moving water inlet channel outlet, the axial moving water inlet channel, and the water inlet annular groove are connected.

[0018] As a further improvement of the present invention, the interior of the fixed housing is provided with two static water inlet channels symmetrically arranged about the central axis of the fixed housing; there are two static water inlet channels and two static water inlets; the interior of the fixed housing is provided with two return water annular grooves and an axial static return water channel symmetrically arranged about the central axis of the fixed housing, and there are two static return water outlets.

[0019] As a further improvement of the present invention, the inner rotating shaft has two axial moving water inlet channels symmetrically arranged about the central axis of the inner rotating shaft, and the moving water inlet channels have two outlets; the inner rotating shaft has two moving return water channels symmetrically arranged about the central axis of the inner rotating shaft, and the moving return water channels have two inlets.

[0020] As a further improved technical solution of the present invention, there are two collection annular grooves, namely an upper collection annular groove and a lower collection annular groove. The return water annular groove, the upper collection annular groove and the lower collection annular groove penetrate the inner wall of the fixed shell. The upper collection annular groove, the radial static water inlet channel, the return water annular groove and the lower collection annular groove are arranged in order from top to bottom.

[0021] As a further improved technical solution of the present invention, the sealing ring includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring is located between the upper collecting annular groove and the radial static water inlet channel, the second sealing ring is located between the radial static water inlet channel and the return water annular groove, and the third sealing ring is located between the return water annular groove and the lower collecting annular groove; the first sealing ring, the second sealing ring, and the third sealing ring are all located at the contact position between the outer wall of the rotating inner shaft and the inner wall of the fixed outer shell;

[0022] If the first sealing ring fails, the leaked water will leak into the upper collection annular groove. When the water in the upper collection annular groove reaches a certain amount, the water will be discharged from the fixed housing through the drainage channel. If the third sealing ring fails, the leaked water will leak into the lower collection annular groove. When the water in the lower collection annular groove reaches a certain amount, the water will be discharged from the fixed housing through the drainage channel.

[0023] As a further improvement of the present invention, a fourth sealing ring is provided between the rotating inner shaft and the fixed outer shell. The fourth sealing ring is located near the bottom of the rotating inner shaft and the inner wall of the fixed outer shell, and is located inside the lower collection annular groove.

[0024] As a further improved technical solution of the present invention, the drainage channel includes an upper radial drainage channel, an axial drainage channel and a lower radial drainage channel; a drainage channel outlet one is opened on the lower surface of the fixed shell, and a drainage channel outlet two is opened on the outer wall of the fixed shell; the upper collection annular groove, the upper radial drainage channel, the axial drainage channel and the drainage channel outlet one are connected, and the lower collection annular groove, the lower radial drainage channel, the axial drainage channel and the drainage channel outlet two are connected.

[0025] As a further improved technical solution of the present invention, there are two upper radial drainage channels, two axial drainage channels and two lower radial drainage channels, and the two upper radial drainage channels, the two axial drainage channels and the two lower radial drainage channels are all symmetrically arranged about the central axis of the fixed shell.

[0026] The beneficial effects of this invention are as follows:

[0027] In this invention, the static water inlet channel inlet, axial static water inlet channel, radial static water inlet channel, static water inlet channel outlet, water inlet annular groove, and axial dynamic water inlet channel constitute the water inlet passage; the dynamic return water inlet channel, axial dynamic return water channel, radial dynamic return water channel, dynamic return water channel outlet, return water annular groove, axial static return water channel, and static return water channel outlet constitute the water return passage; the upper collection annular groove, upper radial drainage channel, axial drainage channel, and drainage channel outlet one constitute drainage passage a; the lower collection annular groove, lower radial drainage channel, axial drainage channel, and drainage channel outlet two or drainage channel outlet one constitute drainage passage b. When the rotary joint is in operation, the fixed outer shell remains stationary, while the top of the rotating inner shaft can be connected to other mechanisms via screws. These other mechanisms rotate the inner shaft. Simultaneously, cooling water enters from the static water inlet channel and is transported to the parts of the machine requiring cooling through a water flow path consisting of the axial static water inlet channel, radial static water inlet channel, inlet annular groove, axial moving water inlet channel, and moving water inlet channel outlet. After being cooled by the machine, the water flows through the moving return water inlet channel, axial moving return water inlet channel, radial moving return water inlet channel, return annular groove, axial static return water inlet channel, and static return water outlet channel. The water return path formed by the return water outlet returns to the water tank; the mechanism of the rotary joint's leak-proof structure is as follows: when the first sealing ring of the rotary joint fails, the leaked water leaks into the upper collection annular groove. When the water in the upper collection annular groove reaches a certain amount, it is discharged through the upper radial drainage channel, the axial drainage channel, and the drainage channel outlet, forming drainage path a; when the third sealing ring in the rotary joint fails, the leaked water leaks into the lower collection annular groove. When the water in the lower collection annular groove reaches a certain amount, it is discharged through the lower radial drainage channel and the axial drainage channel, forming drainage path b.

[0028] The rotary joint of this invention adopts a fixed outer shell and rotating inner shaft method, which orderly arranges multiple water inlet pipes, water return pipes, and drainage pipes inside the fixed outer shell and rotating inner shaft, greatly improving the space utilization of the rotary joint and making the structure compact. In addition to the traditional rotary joint that uses sealing rings to seal and separate each flow channel, the rotary joint of this application is additionally equipped with special leak-proof upper and lower leak-collecting annular grooves. When the sealing ring fails, the leaked water can be collected and automatically discharged from the rotary joint through the drainage channel when a certain leakage amount is reached. The upper leak-collecting annular groove can prevent water in the flow channel from leaking from the top of the rotary joint when the first sealing ring fails and negative pressure is generated. The lower leak-collecting annular groove can prevent water leakage in the flow channel due to the failure of the third sealing ring, which would affect the circuit. The leak-collecting annular grooves ensure the smooth operation of the rotary joint to a greater extent and prevent leaked water from contacting the middle cable and affecting the operation of the overall machine. Attached Figure Description

[0029] Figure 1A schematic diagram of the structure of the rotary joint provided in the embodiments of this application. Figure 1 .

[0030] Figure 2 A schematic diagram of the structure of the rotary joint provided in the embodiments of this application. Figure 2 .

[0031] Figure 3 This is a top view of the rotary joint provided in an embodiment of this application.

[0032] Figure 4 This is a bottom view of the rotary joint provided in an embodiment of this application.

[0033] Figure 5 for Figure 3 Sectional view of AA.

[0034] Figure 6 for Figure 3 Cross-sectional view of the middle section (BB).

[0035] Figure 7 for Figure 4 Cross-sectional view of DD. Detailed Implementation

[0036] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0037] like Figure 1-4 As shown, a method for preventing water leakage from a rotary joint includes a rotary joint, which comprises a fixed outer shell 2 and a rotating inner shaft 1 rotatably connected. The rotating inner shaft 1 is rotatably connected to the fixed outer shell 2 via a rotary support shaft 32. The rotating inner shaft 1 is located inside the fixed outer shell 2. The inner wall of the fixed outer shell 2 is a stepped, bent inner wall, and the outer wall of the rotating inner shaft 1 is a stepped, bent outer wall that matches the shape of the inner wall of the fixed outer shell 2. A rotary support shaft 32 is also installed between the inner wall of the fixed outer shell 2 and the outer wall of the rotating inner shaft 1, and the two are rotatably connected via the rotary support shaft 32.

[0038] like Figure 5-7 As shown, the interior of the fixed housing 2 is provided with a static water inlet channel (including an axial static water inlet channel 22 and a radial static water inlet channel 23), a return water channel (i.e., an axial static return water channel 11), and a return water annular groove 12; the lower surface of the fixed housing 2 is provided with a static water inlet channel inlet 7 and a static return water channel outlet 10, and the inner wall of the fixed housing 2 is provided with a static water inlet channel outlet 33; wherein, the return water annular groove 12, the axial static return water channel 11, and the static return water channel outlet 10 are connected, and the static water inlet channel outlet 33, the radial static water inlet channel 23, the static water inlet channel 22, and the static water inlet channel inlet 7 are connected;

[0039] like Figure 5-7As shown, the inner rotating shaft 1 has a dynamic return water channel (including a radial dynamic return water channel 14 and an axial dynamic return water channel 15), a dynamic inlet water channel (such as an axial dynamic inlet water channel 27), and an inlet annular groove 28. The upper surface of the inner rotating shaft 1 has a dynamic return water channel inlet 3 and a dynamic inlet water channel outlet 4. The inner wall of the inner rotating shaft 1 has a dynamic return water channel outlet 34. The dynamic return water channel inlet 3, the axial dynamic return water channel 15, the radial dynamic return water channel 14, and the dynamic return water channel outlet 34 are connected. The dynamic return water channel outlet 34 is aligned and connected with the return water annular groove 12. The dynamic inlet water channel outlet 4, the axial dynamic inlet water channel 27, and the inlet annular groove 28 are connected. The inlet annular groove 28 is connected with the static inlet water channel outlet 33.

[0040] Leak prevention methods specifically include:

[0041] A sealing ring is provided above and below the outlet 34 of the dynamic return water channel and the return water annular groove 12, and a sealing ring is provided above and below the inlet annular groove 28 and the outlet 33 of the static inlet water channel; the sealing ring is located between the rotating inner shaft 1 and the fixed outer shell 2.

[0042] A collection annular groove is provided on the inner wall of the fixed housing 2. The collection annular groove is located above and / or below the sealing ring 1. A drainage channel is provided inside the fixed housing 2. One end of the collection annular groove is connected to the drainage channel.

[0043] The annular groove is used to collect water that leaks when the sealing ring fails, and the water flows out of the fixed housing 2 through the drainage channel.

[0044] In this embodiment, the interior of the fixed housing 2 has two static water inlet channels (including an axial static water inlet channel 22 and a radial static water inlet channel 23) symmetrically arranged about the central axis of the fixed housing 2; there are two static water inlet channel outlets 33 and two static water inlets 7, and the static water inlet channel inlet 7 can be threaded to facilitate threaded connection with external pipes; the interior of the fixed housing 2 has two return water annular grooves 12 and an axial static return water channel 11 symmetrically arranged about the central axis of the fixed housing 2, and there are two static return water channel outlets 10, which are threaded to facilitate threaded connection with external pipes.

[0045] In this embodiment, the inner rotating shaft 1 has two axial moving water inlet channels 27 symmetrically arranged about the central axis of the inner rotating shaft 1, and two moving water inlet channel outlets 4. The moving water inlet channel outlets 4 are threaded and can be threaded to external pipes. The inner rotating shaft 1 also has two moving return water channels (including a radial moving return water channel 14 and an axial moving return water channel 15) symmetrically arranged about the central axis of the inner rotating shaft 1. The moving return water channel inlets 3 are two threaded and can be threaded to external pipes.

[0046] In this embodiment, there are two collection annular grooves, namely the upper collection annular groove 16 and the lower collection annular groove 17. The return water annular groove 12, the upper collection annular groove 16 and the lower collection annular groove 17 penetrate the inner wall of the fixed housing 2. The upper collection annular groove 16, the radial static water inlet channel 23, the return water annular groove 12 and the lower collection annular groove 17 are arranged sequentially from top to bottom.

[0047] In this embodiment, the sealing ring includes a first sealing ring 18, a second sealing ring 19, and a third sealing ring 20. The first sealing ring 18 is located between the upper collecting annular groove 16 and the radial static water inlet channel 23, the second sealing ring 19 is located between the radial static water inlet channel 23 and the return water annular groove 12, and the third sealing ring 20 is located between the return water annular groove 12 and the lower collecting annular groove 17. The first sealing ring 18, the second sealing ring 19, and the third sealing ring 20 are all located at the contact position between the outer wall of the rotating inner shaft 1 and the inner wall of the fixed outer casing 2.

[0048] If the first sealing ring 18 fails, the leaked water will leak into the upper collecting annular groove 16. When the water in the upper collecting annular groove 16 reaches a certain amount, the water will be discharged from the fixed housing 2 through the drainage channel. If the third sealing ring 20 fails, the leaked water will leak into the lower collecting annular groove 17. When the water in the lower collecting annular groove 17 reaches a certain amount, the water will be discharged from the fixed housing 2 through the drainage channel.

[0049] A dustproof ring 13 is provided between the top of the rotating inner shaft 1 and the top of the fixed outer shell 2.

[0050] In this embodiment, a fourth sealing ring 21 is provided between the rotating inner shaft 1 and the fixed outer shell 2. The fourth sealing ring 21 is located near the bottom of the rotating inner shaft 1 and the inner wall of the fixed outer shell 2, and is located inside the lower collection annular groove 17.

[0051] The first sealing ring 18, the second sealing ring 19, the third sealing ring 20, and the fourth sealing ring 21 are installed between the rotating inner shaft 1 and the fixed outer shell 2, forming a sealed rotating connection. The first sealing ring 18, the second sealing ring 19, the third sealing ring 20, and the fourth sealing ring 21 are used to seal the minute gaps between the rotating inner shaft 1 and the fixed outer shell 2 to prevent water leakage. The first sealing ring 18, the second sealing ring 19, the third sealing ring 20, and the fourth sealing ring 21 are installed in sealing ring grooves on the fixed outer shell 2.

[0052] In this embodiment, the drainage channel includes an upper radial drainage channel 29, an axial drainage channel 30, and a lower radial drainage channel 31; a drainage channel outlet 8 is provided on the lower surface of the fixed housing 2, and a drainage channel outlet 5 is provided on the outer wall of the fixed housing 2; the upper collecting annular groove 16, the upper radial drainage channel 29, the axial drainage channel 30, and the drainage channel outlet 8 are connected, and the lower collecting annular groove 17, the lower radial drainage channel 31, the axial drainage channel 30, and the drainage channel outlet 5 are connected.

[0053] In this embodiment, there are two upper radial drainage channels 29, two axial drainage channels 30 and two lower radial drainage channels 31, and the two upper radial drainage channels 29, the two axial drainage channels 30 and the two lower radial drainage channels 31 are all symmetrically arranged about the central axis of the fixed housing 2.

[0054] In this embodiment, a cable channel 35 is provided at the center of the rotating inner shaft 1. The cable supplies power to the required machine through the cable channel 35.

[0055] In this embodiment, the slewing bearing shaft 32 includes an outer slewing bearing shaft 24, an inner slewing bearing shaft 26, and slewing bearing bearing balls 25. The outer slewing bearing shaft 24 and the inner slewing bearing shaft 26 are rotatably connected by the slewing bearing bearing balls 25. The outer slewing bearing shaft 24 is connected to the threaded hole 6 at the top of the inner slewing shaft 1 by screws. The inner slewing bearing shaft 26 is connected to the fixed housing 2 by bolts.

[0056] The rotary joint has a lower fixing threaded hole 9 at the bottom, which can be fixed to the installation part; when the rotary joint is installed, the radial static water inlet channel 23 corresponds to the water inlet annular groove 28; the radial return water channel 14 corresponds to the return water annular groove 12.

[0057] In this embodiment, the static water inlet channel 7, the axial static water inlet channel 22, the radial static water inlet channel 23, the static water inlet channel outlet 33, the water inlet annular groove 28, and the axial dynamic water inlet channel 27 constitute the water inlet passage; the dynamic return water inlet channel 3, the axial dynamic return water channel 15, the radial dynamic return water channel 14, the dynamic return water channel outlet 34, the return water annular groove 12, the axial static return water channel 11, and the static return water channel outlet 10 constitute the water return passage; the upper collection annular groove 16, the upper radial drainage channel 29, the axial drainage channel 30, and the drainage channel outlet 8 constitute the drainage passage a; the lower collection annular groove 17, the lower radial drainage channel 31, the axial drainage channel 30, and the drainage channel outlet 5 or the drainage channel outlet 8 constitute the drainage passage b.

[0058] In this embodiment, when the rotary joint is working, the fixed outer shell 2 remains stationary, and the top of the rotating inner shaft 1 can be connected to other mechanisms via screws. These other mechanisms rotate the inner shaft 1. Simultaneously, external cooling water enters from the static water inlet 7 and is transported to the machine's cooling components via a water flow path consisting of the axial static water inlet 22, the radial static water inlet 23, the water inlet annular groove 28, the axial moving water inlet 27, and the moving water inlet outlet 4. The moving water inlet outlet 4 can be designed as a threaded opening for easy connection to the inlet of the machine's cooling components. After being cooled by the machine, the water flows through the moving return water inlet 3 and the axial moving return water... The water return path formed by the flow channel 15, radial dynamic return water flow channel 14, return water annular groove 12, axial static return water flow channel 11, and static return water flow channel outlet 10 returns the water back to the water tank; the mechanism of the rotary joint anti-leakage structure is as follows: when the first sealing ring 18 of the rotary joint fails, the leaked water leaks into the upper collection annular groove 16. When it reaches a certain amount, it is discharged through the upper radial drainage flow channel 29, axial drainage flow channel 30, and drainage flow channel outlet 8 to form drainage path a; when the third sealing ring 20 in the rotary joint fails, the leaked water leaks into the lower collection annular groove 17. When it reaches a certain amount, it is discharged through the lower radial drainage flow channel 31 and axial drainage flow channel 30 to form drainage path b.

[0059] The rotary joint provided in this application adopts a fixed outer shell and rotating inner shaft method, which orderly arranges multiple water inlet channels, water return channels, and drainage channels inside the fixed outer shell and rotating inner shaft, greatly improving the space utilization of the rotary joint and making the structure compact. In addition to the traditional rotary joint that uses sealing rings to seal and separate each channel, the rotary joint of this application is additionally equipped with special anti-leakage water collection annular grooves, upper leakage collection annular groove 16 and lower leakage collection annular groove 17. When the sealing ring fails, the leaked water can be collected and automatically discharged from the rotary joint through the drainage channel when a certain leakage amount is reached. The upper leakage collection annular groove 16 can prevent water in the channel from leaking from the top of the rotary joint when the first sealing ring 18 fails and negative pressure is generated. The lower leakage collection annular groove 17 can prevent water leakage in the channel due to the failure of the third sealing ring 20, which would affect the circuit. The leakage collection annular grooves ensure the smooth operation of the rotary joint to a greater extent and prevent leaked water from contacting the middle cable and affecting the operation of the overall machine. The rotary joint can deliver water and electricity to the respective required mechanisms.

[0060] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A method for preventing water leakage from a rotary joint, characterized in that, It includes a rotary joint, which includes a fixed housing (2) for rotatable connection and a rotating inner shaft (1); The interior of the fixed housing (2) is provided with a static water inlet channel, a return water channel and a return water annular groove (12); the lower surface of the fixed housing (2) is provided with a static water inlet channel inlet (7) and a static return water channel outlet (10); the inner wall of the fixed housing (2) is provided with a static water inlet channel outlet (33); wherein, the return water annular groove (12), the return water channel and the static return water channel outlet (10) are connected, and the static water inlet channel outlet (33), the static water inlet channel and the static water inlet channel inlet (7) are connected. The rotating inner shaft (1) has a moving return water channel, a moving inlet water channel, and an inlet annular groove (28) inside; the upper surface of the rotating inner shaft (1) has a moving return water channel inlet (3) and a moving inlet water channel outlet (4); the inner wall of the rotating inner shaft (1) has a moving return water channel outlet (34), wherein the moving return water channel inlet (3), the moving return water channel, and the moving return water channel outlet (34) are connected; the moving return water channel outlet (34) is aligned and connected with the return water annular groove (12); the moving inlet water channel outlet (4), the moving inlet water channel, and the inlet annular groove (28) are connected; the inlet annular groove (28) is connected with the static inlet water channel outlet (33); Leak prevention methods include: A sealing ring is provided above and below the outlet (34) of the dynamic return water channel and the return water annular groove (12) that are aligned and connected. A sealing ring is provided above and below the inlet annular groove (28) and the outlet (33) of the static inlet water channel that are aligned and connected. The sealing ring is located between the rotating inner shaft (1) and the fixed outer shell (2). A collection annular groove is provided on the inner wall of the fixed housing (2). The collection annular groove is located above and / or below the sealing ring. A drainage channel is provided inside the fixed housing (2). One end of the collection annular groove is connected to the drainage channel. The annular groove is used to collect water that leaks when the seal fails and flows out of the fixed housing (2) through the drainage channel.

2. The method for preventing water leakage from a rotary joint according to claim 1, characterized in that, The static water inlet channel includes an axial static water inlet channel (22) and a radial static water inlet channel (23); the static water inlet channel outlet (33), the radial static water inlet channel (23), the static water inlet channel (22) and the static water inlet channel inlet (7) are connected; The return water channel is an axial static return water channel (11), and the return water annular groove (12), the axial static return water channel (11) and the static return water channel outlet (10) are connected. The dynamic return water channel includes a radial dynamic return water channel (14) and an axial dynamic return water channel (15), and the dynamic return water channel inlet (3), the axial dynamic return water channel (15), the radial dynamic return water channel (14) and the dynamic return water channel outlet (34) are connected. The moving water inlet channel is an axial moving water inlet channel (27), and the moving water inlet channel outlet (4), the axial moving water inlet channel (27), and the water inlet annular groove (28) are connected.

3. The method for preventing water leakage from a rotary joint according to claim 2, characterized in that, The interior of the fixed housing (2) is provided with two static water inlet channels symmetrically arranged about the central axis of the fixed housing (2); there are two static water inlet channel outlets (33) and two static water inlets (7); the interior of the fixed housing (2) is provided with two return water annular grooves (12) and an axial static return water channel (11) symmetrically arranged about the central axis of the fixed housing (2), and there are two static return water channel outlets (10).

4. The method for preventing water leakage from a rotary joint according to claim 2, characterized in that, The inner rotating shaft (1) has two axial moving water inlet channels (27) symmetrically arranged about the central axis of the inner rotating shaft (1), and there are two moving water inlet outlets (4); the inner rotating shaft (1) has two moving return water channels symmetrically arranged about the central axis of the inner rotating shaft (1), and there are two moving return water inlets (3).

5. The method for preventing water leakage from a rotary joint according to claim 2, characterized in that, There are two annular grooves for collecting water, namely an upper annular groove (16) and a lower annular groove (17). The return water annular groove (12), the upper annular groove (16) and the lower annular groove (17) penetrate the inner wall of the fixed outer shell (2). The upper annular groove (16), the radial static water inlet channel (23), the return water annular groove (12) and the lower annular groove (17) are arranged in order from top to bottom.

6. The method for preventing water leakage from a rotary joint according to claim 5, characterized in that, The sealing ring includes a first sealing ring (18), a second sealing ring (19), and a third sealing ring (20). The first sealing ring (18) is located between the upper drain annular groove (16) and the radial static water inlet channel (23), the second sealing ring (19) is located between the radial static water inlet channel (23) and the return water annular groove (12), and the third sealing ring (20) is located between the return water annular groove (12) and the lower drain annular groove (17). The first sealing ring (18), the second sealing ring (19), and the third sealing ring (20) are all located at the contact position between the outer wall of the rotating inner shaft (1) and the inner wall of the fixed outer shell (2). If the first sealing ring (18) fails, the leaked water will leak into the upper collection annular groove (16). When the water in the upper collection annular groove (16) reaches a certain amount, the water will be discharged from the fixed shell (2) through the drainage channel. If the third sealing ring (20) fails, the leaked water will leak into the lower collection annular groove (17). When the water in the lower collection annular groove (17) reaches a certain amount, the water will be discharged from the fixed shell (2) through the drainage channel.

7. The method for preventing water leakage from a rotary joint according to claim 6, characterized in that, A fourth sealing ring (21) is provided between the rotating inner shaft (1) and the fixed outer shell (2). The fourth sealing ring (21) is located near the bottom of the rotating inner shaft (1) and the inner wall of the fixed outer shell (2), and is located inside the lower collection annular groove (17).

8. The method for preventing water leakage from a rotary joint according to claim 6, characterized in that, The drainage channels include an upper radial drainage channel (29), an axial drainage channel (30), and a lower radial drainage channel (31); the lower surface of the fixed housing (2) is provided with a drainage channel outlet one (8), and the outer wall of the fixed housing (2) is provided with a drainage channel outlet two (5); the upper collection annular groove (16), the upper radial drainage channel (29), the axial drainage channel (30), and the drainage channel outlet one (8) are connected, and the lower collection annular groove (17), the lower radial drainage channel (31), the axial drainage channel (30), and the drainage channel outlet two (5) are connected.

9. The method for preventing water leakage from a rotary joint according to claim 8, characterized in that, There are two upper radial drainage channels (29), two axial drainage channels (30) and two lower radial drainage channels (31), and the two upper radial drainage channels (29), two axial drainage channels (30) and two lower radial drainage channels (31) are symmetrical about the central axis of the fixed shell (2).

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