Water leakage prevention swivel joint

Abstract

The utility model discloses a water leakage prevention swivel joint which comprises a rotating inner shaft and a fixed shell which are rotationally connected. A static water inlet flow channel, a water return flow channel, a water return annular groove, a leakage collection annular groove and a water drainage flow channel are formed in the fixed shell. The water return annular groove, the water return runner and the static water return runner outlet are communicated, the static water inlet runner outlet, the static water inlet runner and the static water inlet runner inlet are communicated, and the leakage collection annular groove is communicated with the drainage runner; a movable water return flow channel, a movable water inlet flow channel and a water inlet annular groove are formed in the rotating inner shaft; and a plurality of sealing rings are arranged between the rotating inner shaft and the fixed shell. The rotary joint can convey cooling water, is provided with a plurality of sealing rings, is good in sealing performance, and is provided with the leakage collection annular groove and the drainage runner, the leakage collection annular groove can collect leaked water when the sealing rings fail in sealing, and the leaked water is automatically drained out of the rotary joint through the drainage runner when a certain leakage rate is reached, so that the water in the runner in the rotary joint is further prevented from leaking, and the service life of the rotary joint is prolonged. The problem of leakage of an existing swivel joint is solved.

Description

Technical Field

[0001] The utility model relates to the engineering field, in particular to a water leakage-proof swivel joint, which improves the leakage problem of the existing swivel joint. Background Art

[0002] When a large crane is working, it is necessary to transport cooling water to cool the machine (such as the boom), that is, the external water source transports cooling water to the boom through a swivel joint. The swivel joint is a mechanical connection component that can transport cooling water and must ensure that the cooling water is transported without affecting the free rotation of the boom. The cooling water and cables required for the boom to work need to be transferred through the swivel joint.

[0003] There are similar patents now, such as CN219282683U, which introduces a swivel joint for high-altitude operations of fire trucks, and CN219218983U, which introduces a swivel joint that is easy to process. However, these swivel joints will still leak water and oil after working for a long time due to wear and aging of the sealing ring, affecting the circuit in the machine connected to the swivel joint and causing damage to the overall mechanical structure.

[0004] Therefore, it is necessary to study a swivel joint with better water leakage prevention performance and capable of transporting cooling water. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a water-leakage-proof rotary joint in view of the deficiencies of the above-mentioned prior art. The water-leakage-proof rotary joint can transport cooling water and is provided with multiple sealing rings, has good sealing performance, is provided with a leakage collecting annular groove and a drainage channel. The leakage collecting annular groove can collect the leaked water when the sealing ring fails to seal, and automatically discharge the leaked water through the drainage channel to the rotary joint when a certain leakage amount is reached, further preventing the flow channel water in the rotary joint from leaking and affecting the circuit in the machine connected to the rotary joint, so as to avoid the problem of leakage affecting the operation of the machine.

[0006] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0007] A water-leakage-proof swivel joint comprises a fixed outer shell and a rotating inner shaft which are rotatably connected, wherein the rotating inner shaft is located inside the fixed outer shell;

[0008] The interior of the fixed shell is provided with a static water inlet channel, a return water channel, a return water annular groove, a leakage collecting annular groove and a drainage channel; the lower surface of the fixed shell is provided with a static water inlet channel inlet and a static return water channel outlet, and the inner wall of the fixed shell is provided with 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, the static water inlet channel outlet, the static water inlet channel and the static water inlet channel inlet are connected, and the leakage collecting annular groove and the drainage channel are connected;

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

[0010] A plurality of sealing rings are arranged between the rotating inner shaft and the fixed outer shell.

[0011] As a further improved technical solution of the utility model, the static water inlet flow channel includes an axial static water inlet flow channel and a radial static water inlet flow channel; the static water inlet flow channel outlet, the radial static water inlet flow channel, the static water inlet flow channel and the static water inlet flow channel inlet are connected;

[0012] The water return channel is an axial static water return channel, and the water return annular groove, the axial static water return channel and the static water return channel outlet are connected;

[0013] The dynamic return water flow channel comprises a radial dynamic return water flow channel and an axial dynamic return water flow channel, and the dynamic return water flow channel inlet, the axial dynamic return water flow channel, the radial dynamic return water flow channel and the dynamic return water flow channel outlet are connected;

[0014] The dynamic water inlet flow channel is an axial dynamic water inlet flow channel, and the dynamic water inlet flow channel outlet, the axial dynamic water inlet flow channel and the water inlet annular groove are connected.

[0015] As a further improved technical solution of the utility model, two static water inlet channels symmetrically arranged about the central axis of the fixed shell are opened inside the fixed shell; there are two static water inlet channel outlets and two static water inlet channel inlets; two return water annular grooves and axial static return water channels symmetrically arranged about the central axis of the fixed shell are opened inside the fixed shell, and there are two static return water channel outlets.

[0016] As a further improved technical solution of the utility model, the interior of the rotating inner shaft is provided with two axial dynamic water inlet channels which are symmetrically arranged about the central axis of the rotating inner shaft, and there are two dynamic water inlet channel outlets; the interior of the rotating inner shaft is provided with two dynamic return water channels which are symmetrically arranged about the central axis of the rotating inner shaft, and there are two dynamic return water channel inlets.

[0017] As a further improved technical solution of the utility model, there are two leakage collecting annular grooves, namely an upper leakage collecting annular groove and a lower leakage collecting annular groove. The return water annular groove, the upper leakage collecting annular groove and the lower leakage collecting annular groove pass through the inner wall of the fixed outer shell; the upper leakage collecting annular groove, the radial static water inlet channel, the return water annular groove and the lower leakage collecting annular groove are arranged in sequence from top to bottom.

[0018] As a further improved technical solution of the utility model, a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring are provided between the rotating inner shaft and the fixed outer shell, wherein the first sealing ring is located between the upper leakage 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, the third sealing ring is located between the return water annular groove and the lower leakage collecting annular groove, and the fourth sealing ring is located on the inner side of the lower leakage collecting annular groove; a dust ring is provided between the top of the rotating inner shaft and the top of the fixed outer shell.

[0019] As a further improved technical solution of the utility model, 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 leakage annular groove, the upper radial drainage channel, the axial drainage channel and the drainage channel outlet one are connected, and the lower leakage annular groove, the lower radial drainage channel, the axial drainage channel and the drainage channel outlet two are connected.

[0020] As a further improved technical solution of the utility model, there are two upper radial drainage channels, two axial drainage channels and two lower radial drainage channels, and the two upper radial drainage channels, two axial drainage channels and two lower radial drainage channels are all symmetrically arranged about the central axis of the fixed shell.

[0021] As a further improved technical solution of the utility model, a cable channel is provided at the center of the rotating inner shaft.

[0022] As a further improved technical solution of the utility model, the rotating inner shaft is rotatably connected to the fixed outer shell via a slewing support shaft; the slewing support shaft comprises a slewing support shaft outer shaft, a slewing support shaft inner shaft and slewing support shaft balls; the slewing support shaft outer shaft and the slewing support shaft inner shaft are rotatably connected via the slewing support shaft balls; the slewing support shaft outer shaft is connected to the threaded hole at the top of the rotating inner shaft via screws; and the slewing support shaft inner shaft is connected to the fixed outer shell via bolts.

[0023] The beneficial effects of the utility model are:

[0024] In the utility model, the static water inlet flow channel inlet, the axial static water inlet flow channel, the radial static water inlet flow channel, the static water inlet flow channel outlet, the water inlet annular groove, and the axial dynamic water inlet flow channel constitute a water inlet passage; the dynamic return water flow channel inlet, the axial dynamic return water flow channel, the radial dynamic return water flow channel, the dynamic return water flow channel outlet, the return water annular groove, the axial static return water flow channel, and the static return water flow channel outlet constitute a water return water passage; the upper leakage collecting annular groove, the upper radial drainage flow channel, the axial drainage flow channel, and the drainage flow channel outlet 1 constitute a drainage passage a; the lower leakage collecting annular groove, the lower radial drainage flow channel, the axial drainage flow channel, the drainage flow channel outlet 2 or the drainage flow channel outlet 1 constitute a drainage passage b. When the swivel joint is working, the fixed outer shell is fixed, and the top of the rotating inner shaft can be connected with other mechanisms by screw connection, and the rotating inner shaft is rotated by other mechanisms. At the same time, cooling water is input from the static water inlet channel inlet, and is transported to the part of the machine that needs cooling through the water inlet passage composed of the axial static water inlet channel, the radial static water inlet channel, the water inlet annular groove, the axial dynamic water inlet channel, and the dynamic water inlet channel outlet; the water after being cooled by the machine is transported through the dynamic return water channel inlet, the axial dynamic return water channel, the radial dynamic return water channel, the return water annular groove, the axial static return water channel, and the static water inlet channel outlet. The water return passage formed by the return flow channel outlet returns to the water tank; the working mechanism of the anti-leakage structure of the swivel joint is that when the first sealing ring of the swivel joint fails, the leaked water leaks into the upper leakage collecting annular groove. When the water in the upper leakage collecting annular groove reaches a certain amount, it is discharged through the upper radial drainage flow channel, the axial drainage flow channel, and the drainage flow channel outlet to form a drainage passage a; when the third sealing ring in the swivel joint fails, the leaked water leaks into the lower leakage collecting annular groove. When the water in the lower leakage collecting annular groove reaches a certain amount, it is discharged through the lower radial drainage flow channel and the axial drainage flow channel to form a drainage passage b.

[0025] The swivel joint of the utility model adopts the method of fixing the inner shaft with the outer shell to rotate, and arranges multiple water inlet pipes, return pipes and drainage pipes in an orderly manner inside the fixed outer shell and the rotating inner shaft, which greatly improves the utilization rate of the swivel joint space and has a compact structure. The swivel joint of the utility model is provided with special leak-proof upper leakage collecting annular groove and lower leakage collecting annular groove on the basis of the traditional swivel joint using sealing rings to seal and separate each flow channel, which can collect the leaked water when the sealing ring fails, and automatically discharge the leaked water from the swivel joint through the drainage flow channel when a certain leakage amount is reached. The upper leakage collecting annular groove can prevent the water in the flow channel from leaking from the top of the swivel joint when the first sealing ring fails and negative pressure is generated. The lower leakage collecting annular groove can prevent the third sealing ring from failing, causing water leakage in the flow channel and affecting the circuit. The leakage collecting annular groove ensures the smooth operation of the swivel joint to a greater extent, and prevents the leaked water from contacting the cable in the middle and affecting the operation of the entire machine. A cable channel is provided at the center of the rotating inner shaft, and the cable supplies power to the required machine through the cable channel. Therefore, the swivel joint of the utility model can transport water and electricity to the respective required mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of the rotary joint provided in the embodiment of the present application is schematically shown Figure 1 .

[0027] Figure 2 The structure of the rotary joint provided in the embodiment of the present application is schematically shown Figure 2 .

[0028] Figure 3 A top view of a swivel joint provided in an embodiment of the present application.

[0029] Figure 4 A bottom view of the swivel joint provided in an embodiment of the present application.

[0030] Figure 5 for Figure 3 Middle AA section view.

[0031] Figure 6 for Figure 3 Middle BB cross-section.

[0032] Figure 7 for Figure 4 Middle DD section view. DETAILED DESCRIPTION

[0033] The specific implementation of the utility model is further described below according to the accompanying drawings:

[0034] like Figure 1-4 As shown, a water-leakage-proof swivel joint comprises a fixed outer shell 2 and a rotating inner shaft 1. The rotating inner shaft 1 is rotatably connected to the fixed outer shell 2 via a swivel support shaft 32. The rotating inner shaft 1 is located on the inner side of 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 is connected to the shape of the inner wall of the fixed outer shell 2. A swivel 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 swivel support shaft 32.

[0035] like Figure 5-7 As shown, the interior of the fixed shell 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), a return water annular groove 12, a leakage collecting annular groove and a drainage channel. The lower surface of the fixed shell 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 shell 2 is provided with a static water inlet channel outlet 33. Among them, the return water annular groove 12, the axial static return water channel 11 and the static return water channel outlet 10 are connected, the static water inlet channel outlet 33, the radial static water inlet channel 23, the axial static water inlet channel 22 and the static water inlet channel inlet 7 are connected, and the leakage collecting annular groove and the drainage channel are connected.

[0036] like Figure 5-7 As shown, the interior of the rotating inner shaft 1 is provided with a dynamic return water channel (including a radial dynamic return water channel 14, an axial dynamic return water channel 15), a dynamic inlet water channel (such as an axial dynamic inlet water channel 27) and an inlet water annular groove 28. The upper surface of the rotating inner shaft 1 is provided with a dynamic return water channel inlet 3 and a dynamic inlet water channel outlet 4. The inner wall of the rotating inner shaft 1 is provided with a dynamic return water channel outlet 34. Among them, 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 water annular groove 28 are connected; the inlet water annular groove 28 is connected with the radial static inlet water channel 23 through the static inlet water channel outlet 33.

[0037] In this embodiment, two static water inlet channels (including an axial static water inlet channel 22 and a radial static water inlet channel 23) are opened inside the fixed shell 2 and are symmetrically arranged about the central axis of the fixed shell 2; there are two static water inlet channel outlets 33 and two static water inlet channel inlets 7, and the static water inlet channel inlet 7 can be a threaded port, which can be threadedly connected to an external pipe.

[0038] In this embodiment, the interior of the fixed shell 2 is provided with two return water annular grooves 12 and an axial static return water channel 11 which are symmetrically arranged about the central axis of the fixed shell 2. There are two static return water channel outlets 10, and the static return water channel outlets 10 can be threaded ports that can be threadedly connected to external pipes.

[0039] In this embodiment, there are two leakage collecting annular grooves, namely an upper leakage collecting annular groove 16 and a lower leakage collecting annular groove 17. The return water annular groove 12, the upper leakage collecting annular groove 16 and the lower leakage collecting annular groove 17 penetrate the inner wall of the fixed outer shell 2; the upper leakage collecting annular groove 16, the radial static water inlet channel 23, the return water annular groove 12, and the lower leakage collecting annular groove 17 are arranged in sequence from top to bottom.

[0040] 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 1 8 is opened on the lower surface of the fixed shell 2, and a drainage channel outlet 2 5 is opened on the outer wall of the fixed shell 2; the upper leakage annular groove 16, the upper radial drainage channel 29, the axial drainage channel 30 and the drainage channel outlet 1 8 are connected, and the lower leakage annular groove 17, the lower radial drainage channel 31, the axial drainage channel 30 and the drainage channel outlet 2 5 are connected.

[0041] 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 shell 2 .

[0042] In this embodiment, the interior of the rotating inner shaft 1 is provided with two axial dynamic water inlet channels 27 which are symmetrically arranged about the central axis of the rotating inner shaft 1, and there are two dynamic water inlet channel outlets 4, which can be threaded openings and can be threadedly connected to the external pipe; the interior of the rotating inner shaft 1 is provided with two dynamic return water channels (including radial dynamic return water channels 14 and axial dynamic return water channels 15) which are symmetrically arranged about the central axis of the rotating inner shaft 1, and there are two dynamic return water channel inlets 3, which can be threaded openings and can be threadedly connected to the external pipe.

[0043] A plurality of sealing rings are arranged between the rotating inner shaft 1 and the fixed outer shell 2. The sealing rings are used to seal the slight gap between the rotating inner shaft 1 and the fixed outer shell 2 to prevent water leakage.

[0044] In this embodiment, a first sealing ring 18, a second sealing ring 19, a third sealing ring 20 and a fourth sealing ring 21 are provided between the rotating inner shaft 1 and the fixed outer shell 2, wherein the first sealing ring 18 is located between the upper leakage 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, the third sealing ring 20 is located between the return water annular groove 12 and the lower leakage collecting annular groove 17, and the fourth sealing ring 21 is located on the inner side of the lower leakage collecting annular groove 17; a dust ring 13 is provided between the top of the rotating inner shaft 1 and the top of the fixed outer shell 2. The position where the sealing ring is installed between the rotating inner shaft 1 and the fixed outer shell 2 is sealed and rotatably connected. The first sealing ring 18, the second sealing ring 19, the third sealing ring 20 and the fourth sealing ring 21 are installed in the sealing ring groove on the fixed outer shell 2.

[0045] In this embodiment, a cable channel 35 is provided at the center of the rotating inner shaft 1. Cables pass through the cable channel 35 to supply power to the required machines.

[0046] In this embodiment, the swivel support shaft 32 includes a swivel support shaft outer shaft 24, a swivel support shaft inner shaft 26 and a swivel support shaft ball 25. The swivel support shaft outer shaft 24 and the swivel support shaft inner shaft 26 are rotatably connected via the swivel support shaft ball 25. The swivel support shaft outer shaft 24 is connected to the threaded hole 6 at the top of the rotating inner shaft 1 via screws, and the swivel support shaft inner shaft 26 is connected to the fixed housing 2 via bolts.

[0047] The bottom of the swivel joint is provided with a lower fixing threaded hole 9, which can be fixed to the installation position; when the swivel joint is installed, the radial static water inlet channel 23 corresponds to the water inlet annular groove 28; the radial water return channel 14 corresponds to the water return annular groove 12.

[0048] In this embodiment, the static water inlet channel inlet 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 a water inlet passage; the dynamic return water channel inlet 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 a water return water passage; the upper leakage collecting annular groove 16, the upper radial drainage channel 29, the axial drainage channel 30, and the drainage channel outlet 8 constitute a drainage passage a; the lower leakage collecting annular groove 17, the lower radial drainage channel 31, the axial drainage channel 30, the drainage channel outlet 25 or the drainage channel outlet 8 constitute a drainage passage b.

[0049] In this embodiment, when the swivel joint is working, the fixed outer shell 2 is fixed, and the top of the rotating inner shaft 1 can be connected to other mechanisms by screw connection, and the rotating inner shaft 1 is rotated by other mechanisms. At the same time, external cooling water is input from the static water inlet channel inlet 7, and is transported to the part of the machine that needs to be cooled through the water inlet passage composed of the axial static water inlet channel 22, the radial static water inlet channel 23, the water inlet annular groove 28, the axial dynamic water inlet channel 27, and the dynamic water inlet channel outlet 4. The dynamic water inlet channel outlet 4 can be designed as a threaded port, which is convenient for connecting the flow channel with the inlet of the part of the machine that needs to be cooled; the water after being cooled by the machine is transported to the part of the machine that needs to be cooled through the dynamic return water channel inlet 3, the axial dynamic return water channel inlet 4, and the dynamic return water channel outlet 4. The water return passage formed by the flow channel 15, the radial dynamic return water flow channel 14, the return water annular groove 12, the axial static return water flow channel 11, and the static return water flow channel outlet 10 returns to the water tank; the working mechanism of the swivel joint anti-leakage structure is that when the first sealing ring 18 of the swivel joint fails, the leaked water leaks into the upper leakage collecting annular groove 16, and when it reaches a certain amount, it is discharged through the upper radial drainage flow channel 29, the axial drainage flow channel 30, and the drainage flow channel outlet 8 to form a drainage passage a; when the third sealing ring 20 in the swivel joint fails, the leaked water leaks into the lower leakage collecting annular groove 17, and when it reaches a certain amount, it is discharged through the lower radial drainage flow channel 31 and the axial drainage flow channel 30 to form a drainage passage b.

[0050] The rotary joint provided by the present application adopts a method of fixing the outer shell and rotating the inner shaft to orderly arrange multiple water inlet channels, return water channels, and drainage channels inside the fixed outer shell and the rotating inner shaft, which greatly improves the utilization rate of the rotary joint space and has a compact structure. The rotary joint of the present application is based on the traditional rotary joint that uses a sealing ring to seal and separate each channel. In addition, a special leak-proof water collection annular groove, an upper leakage collection annular groove 16 and a lower leakage collection annular groove 17 are additionally provided. 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 the water in the flow 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 the third sealing ring 20 from failing, resulting in water leakage in the flow channel and affecting the circuit. The leakage collection annular groove ensures the smooth operation of the rotary joint to a greater extent, and prevents the leaked water from contacting the middle cable and affecting the operation of the entire machine. The rotary joint can transport water and electricity to the respective required mechanisms.

[0051] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A water-leakage-proof swivel joint, characterized in that: It comprises a fixed outer shell (2) and a rotating inner shaft (1) which are rotatably connected, wherein the rotating inner shaft (1) is located on the inner side of the fixed outer shell (2); The interior of the fixed shell (2) is provided with a static water inlet channel, a return water channel, a return water annular groove (12), a leakage collecting annular groove and a drainage channel; the lower surface of the fixed shell (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 shell (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, the static water inlet channel outlet (33), the static water inlet channel and the static water inlet channel inlet (7) are connected, and the leakage collecting annular groove and the drainage channel are connected; The interior of the rotating inner shaft (1) is provided with a dynamic return water flow channel, a dynamic inlet water flow channel and an inlet water annular groove (28); the upper surface of the rotating inner shaft (1) is provided with a dynamic return water flow channel inlet (3) and a dynamic inlet water flow channel outlet (4); the inner wall of the rotating inner shaft (1) is provided with a dynamic return water flow channel outlet (34), wherein the dynamic return water flow channel inlet (3), the dynamic return water flow channel and the dynamic return water flow channel outlet (34) are connected; the dynamic return water flow channel outlet (34) is aligned and connected with the return water annular groove (12); the dynamic inlet water flow channel outlet (4), the dynamic inlet water flow channel and the inlet water annular groove (28) are connected; the inlet water annular groove (28) is connected with the static inlet water flow channel outlet (33); A plurality of sealing rings are provided between the rotating inner shaft (1) and the fixed outer shell (2).

2. The water-leakage-proof swivel joint according to claim 1, characterized in that: The static water inlet flow channel comprises an axial static water inlet flow channel (22) and a radial static water inlet flow channel (23); the static water inlet flow channel outlet (33), the radial static water inlet flow channel (23), the static water inlet flow channel (22) and the static water inlet flow channel inlet (7) are connected; The water return flow channel is an axial static water return flow channel (11), and the water return annular groove (12), the axial static water return flow channel (11) and the static water return flow channel outlet (10) are connected; The dynamic return water flow channel comprises a radial dynamic return water flow channel (14) and an axial dynamic return water flow channel (15); the dynamic return water flow channel inlet (3), the axial dynamic return water flow channel (15), the radial dynamic return water flow channel (14) and the dynamic return water flow channel outlet (34) are connected; The dynamic water inlet flow channel is an axial dynamic water inlet flow channel (27), and the dynamic water inlet flow channel outlet (4), the axial dynamic water inlet flow channel (27) and the water inlet annular groove (28) are connected.

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

4. The water-leakage-proof swivel joint according to claim 2, characterized in that: The interior of the rotating inner shaft (1) is provided with two axial dynamic water inlet channels (27) symmetrically arranged about the central axis of the rotating inner shaft (1), and there are two dynamic water inlet channel outlets (4); the interior of the rotating inner shaft (1) is provided with two dynamic water return channels symmetrically arranged about the central axis of the rotating inner shaft (1), and there are two dynamic water return channel inlets (3).

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

6. The water-leakage-proof swivel joint according to claim 5, characterized in that: A first sealing ring (18), a second sealing ring (19), a third sealing ring (20) and a fourth sealing ring (21) are provided between the rotating inner shaft (1) and the fixed outer shell (2), wherein the first sealing ring (18) is located between the upper leakage 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), the third sealing ring (20) is located between the return water annular groove (12) and the lower leakage collecting annular groove (17), and the fourth sealing ring (21) is located on the inner side of the lower leakage collecting annular groove (17); a dust ring (13) is provided between the top of the rotating inner shaft (1) and the top of the fixed outer shell (2).

7. The water-leakage-proof swivel joint according to claim 6, characterized in that: The drainage channel comprises an upper radial drainage channel (29), an axial drainage channel (30) and a lower radial drainage channel (31); a drainage channel outlet 1 (8) is provided on the lower surface of the fixed shell (2), and a drainage channel outlet 2 (5) is provided on the outer wall of the fixed shell (2); the upper leakage collecting annular groove (16), the upper radial drainage channel (29), the axial drainage channel (30) and the drainage channel outlet 1 (8) are connected, and the lower leakage collecting annular groove (17), the lower radial drainage channel (31), the axial drainage channel (30) and the drainage channel outlet 2 (5) are connected.

8. The water-leakage-proof swivel joint according to claim 7, 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), 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 shell (2).

9. The water-leakage-proof swivel joint according to claim 1, characterized in that: A cable channel (35) is provided at the center of the rotating inner shaft (1).

10. The water-leakage-proof swivel joint according to claim 1, characterized in that: The rotating inner shaft (1) is rotatably connected to the fixed outer shell (2) via a slewing support shaft (32); the slewing support shaft (32) comprises a slewing support shaft outer shaft (24), a slewing support shaft inner shaft (26) and a slewing support shaft ball (25); the slewing support shaft outer shaft (24) and the slewing support shaft inner shaft (26) are rotatably connected via the slewing support shaft ball (25); the slewing support shaft outer shaft (24) and the slewing support shaft inner shaft (26) are rotatably connected to each other via the slewing support shaft ball (25); the slewing support shaft outer shaft (24) and the threaded hole (6) at the top of the rotating inner shaft (1) are connected via screws; and the slewing support shaft inner shaft (26) and the fixed outer shell (2) are connected via bolts.

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