Leakage-proof double-channel swivel joint

Abstract

The utility model discloses a leakproof dual-channel swivel joint which comprises a fixed shell and a rotary inner shaft, and a static water inlet pipeline, a static water return pipeline, a static oil inlet pipeline, a static oil return pipeline, a water inlet annular groove, a water return annular groove, an oil inlet annular groove, an oil return annular groove and a shell drainage pipeline are arranged in the fixed shell; a movable water inlet pipeline, a movable water return pipeline, a movable oil inlet pipeline, a movable oil return pipeline, a liquid collecting tank and an inner shaft liquid discharging pipeline are arranged in the rotating inner shaft; liquid collecting tanks are arranged between the movable water inlet pipeline and the movable water return pipeline, between the movable water return pipeline and the movable oil inlet pipeline, between the movable oil inlet pipeline and the movable oil return pipeline and below the movable oil return pipeline, each liquid collecting tank is communicated with an inner shaft liquid discharging pipeline, and the inner shaft liquid discharging pipeline is communicated with a shell liquid discharging pipeline; the rotary joint can be used between a chassis and an upper frame when the excavator works, hydraulic oil and water can be stably conveyed, the chassis conveys oil and water to the upper frame, and meanwhile the rotary joint has the advantages of being good in sealing performance and the like.

Description

Technical Field

[0001] The utility model belongs to the engineering field, in particular to a leak-proof double-channel swivel joint. Background Art

[0002] An excavator is a heavy-duty construction machine that mainly consists of a chassis and an upper frame, which are connected by a slewing mechanism that allows the excavator to rotate and position within a 360° range, allowing the chassis and upper frame to rotate independently. The most important component in the slewing mechanism is the slewing joint, which enables the chassis to deliver oil and water to the upper frame.

[0003] Existing similar patents CN116641717A involve a central swivel joint and a shield machine having the same; CN218818818U introduces a hydraulic-electric swivel joint used in a hydraulic robot. The above patents all involve the design of swivel joints, but liquid leakage still occurs after long-term use, making the device and the site difficult to clean. Therefore, it is necessary to study a swivel joint with better leak-proof performance and the ability to collect and discharge leaked liquid in the event of leakage. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a leak-proof double-channel swivel joint in view of the deficiencies of the above-mentioned prior art. The leak-proof double-channel swivel joint can be used as a swivel joint between the chassis and the upper frame when the excavator is working. It can stably transport hydraulic oil and water, realize the oil and water delivery from the chassis to the upper frame, and has the characteristics of good sealing performance.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0006] A leakproof double-channel swivel joint, comprising a fixed outer shell and a rotating inner shaft, wherein the fixed outer shell and the rotating inner shaft are rotatably connected;

[0007] The interior of the fixed shell is provided with a static water inlet pipe, a static water return pipe, a static oil inlet pipe, a static oil return pipe, a water inlet annular groove, a water return annular groove, an oil inlet annular groove, an oil return annular groove and a shell drainage pipe; the water inlet annular groove, the water return annular groove, the oil inlet annular groove and the oil return annular groove all penetrate the inner wall of the fixed shell; one end of the shell drainage pipe penetrates the outer wall of the fixed shell, and the other end penetrates the inner wall of the fixed shell;

[0008] One end of the static water inlet pipe penetrates the outer wall of the fixed shell, and the other end is connected to the water inlet annular groove; one end of the static water return pipe penetrates the outer wall of the fixed shell, and the other end is connected to the water return annular groove; one end of the static oil inlet pipe penetrates the outer wall of the fixed shell, and the other end is connected to the oil inlet annular groove; one end of the static oil return pipe penetrates the outer wall of the fixed shell, and the other end is connected to the oil return annular groove;

[0009] The interior of the rotating inner shaft is provided with a dynamic water inlet pipe, a dynamic water return pipe, a dynamic oil inlet pipe, a dynamic oil return pipe, a liquid collecting tank and an inner shaft liquid discharge pipe;

[0010] One end of the dynamic water inlet pipe penetrates the top wall of the rotating inner shaft, and the other end is connected to the water inlet annular groove; one end of the dynamic water return pipe penetrates the top wall of the rotating inner shaft, and the other end is connected to the water return annular groove; one end of the dynamic oil inlet pipe penetrates the top wall of the rotating inner shaft, and the other end is connected to the oil inlet annular groove; one end of the dynamic oil return pipe penetrates the top wall of the rotating inner shaft, and the other end is connected to the oil return annular groove;

[0011] Liquid collecting tanks are arranged between the dynamic water inlet pipe and the dynamic water return pipe, between the dynamic water return pipe and the dynamic oil inlet pipe, between the dynamic oil inlet pipe and the dynamic oil return pipe, and below the dynamic oil return pipe. Each liquid collecting tank is connected to the inner shaft drainage pipe, and the inner shaft drainage pipe is connected to the outer shell drainage pipe.

[0012] Sealing rings are arranged above and below each liquid collecting tank, above and below the water inlet annular groove, above and below the water return annular groove, above and below the oil inlet annular groove, and above and below the oil return annular groove, and the sealing rings are located between the fixed outer shell and the rotating inner shaft.

[0013] As a further improved technical solution of the utility model, the static water inlet pipe is a radial static water inlet pipe, the static water return pipe is a radial static water return pipe, the static oil inlet pipe is a radial static oil inlet pipe, and the static oil return pipe is a radial static oil return pipe.

[0014] As a further improved technical solution of the utility model, the outer surface of the fixed shell is provided with a plurality of steps, which are respectively recorded as a first step outer wall, a second step outer wall, a third step outer wall, and a fourth step outer wall; the inner surface of the fixed shell is provided with a plurality of steps, which are respectively recorded as a first step inner wall, a second step inner wall, a third step inner wall, and a fourth step inner wall;

[0015] The water inlet annular groove is located on the first step inner wall of the fixed shell, the water return annular groove is located on the second step inner wall of the fixed shell, the oil inlet annular groove is located on the third step inner wall of the fixed shell, and the oil return annular groove is located on the fourth step inner wall of the fixed shell; the water inlet annular groove, the water return annular groove, the oil inlet annular groove, and the oil return annular groove are arranged from top to bottom.

[0016] One end of the static water inlet pipe penetrates the first step outer wall of the fixed shell; one end of the static return water pipe penetrates the second step outer wall of the fixed shell; one end of the static oil inlet pipe penetrates the third step outer wall of the fixed shell; one end of the static oil return pipe penetrates the outer wall of the fixed shell.

[0017] As a further improved technical solution of the utility model, the dynamic water inlet pipeline includes an axial dynamic water inlet pipeline and a radial dynamic water inlet pipeline which are connected to each other; one end of the axial dynamic water inlet pipeline passes through the top wall of the rotating inner shaft; one end of the radial dynamic water inlet pipeline passes through the first stepped outer wall of the rotating inner shaft, and is aligned and connected with the water inlet annular groove on the first stepped inner wall of the fixed outer shell;

[0018] The dynamic return water pipeline includes an axial dynamic return water pipeline and a radial dynamic return water pipeline which are connected to each other; one end of the axial dynamic return water pipeline passes through the top wall of the rotating inner shaft; one end of the radial dynamic return water pipeline passes through the second stepped outer wall of the rotating inner shaft and is connected to the return water annular groove on the second stepped inner wall of the fixed outer shell;

[0019] The dynamic oil inlet pipeline includes an axial dynamic oil inlet pipeline and a radial dynamic oil inlet pipeline which are connected to each other, one end of the axial dynamic oil inlet pipeline passes through the top wall of the rotating inner shaft, and one end of the radial dynamic oil inlet pipeline passes through the third step outer wall of the rotating inner shaft and is connected to the oil inlet annular groove on the third step inner wall of the fixed outer shell;

[0020] The dynamic oil return pipeline includes an axial dynamic oil return pipeline and a radial dynamic oil return pipeline which are connected to each other. One end of the axial dynamic oil return pipeline passes through the top wall of the rotating inner shaft, and one end of the radial dynamic oil return pipeline passes through the fourth step outer wall of the rotating inner shaft and is connected to the oil return annular groove on the fourth step inner wall of the fixed outer shell.

[0021] As a further improved technical solution of the utility model, the plurality of liquid collecting tanks are respectively a first liquid collecting tank, a second liquid collecting tank, a third liquid collecting tank and a fourth liquid collecting tank;

[0022] The first collecting tank is located between the radial dynamic water inlet pipe and the radial dynamic water return pipe; the second collecting tank is located between the radial dynamic water return pipe and the radial dynamic oil inlet pipe; the third collecting tank is located between the radial dynamic oil inlet pipe and the radial dynamic oil return pipe; the fourth collecting tank is located below the radial dynamic oil return pipe.

[0023] As a further improved technical solution of the utility model, there are multiple inner shaft drainage pipes, namely a first inner shaft drainage pipe, a second inner shaft drainage pipe, a third inner shaft drainage pipe and a fourth inner shaft drainage pipe;

[0024] The top of the first inner shaft drainage pipe is connected to the first liquid collecting tank, and the bottom end passes through the bottom wall of the rotating inner shaft; the top of the second inner shaft drainage pipe is connected to the second liquid collecting tank, and the bottom end passes through the bottom wall of the rotating inner shaft; the top of the third inner shaft drainage pipe is connected to the third liquid collecting tank, and the bottom end passes through the bottom wall of the rotating inner shaft; the top of the fourth inner shaft drainage pipe is connected to the fourth liquid collecting tank, and the bottom end passes through the bottom wall of the rotating inner shaft;

[0025] A gap is provided between the bottom wall of the rotating inner shaft and the inner wall of the fixed outer shell, and the first inner shaft drainage pipe, the second inner shaft drainage pipe, the third inner shaft drainage pipe and the fourth inner shaft drainage pipe are all connected with the outer shell drainage pipe through the gap.

[0026] As a further improved technical solution of the utility model, there are two outer shell drainage pipes, namely a radial outer shell drainage pipe and an axial outer shell drainage pipe.

[0027] As a further improved technical solution of the utility model, sealing rings are arranged on both sides of the gap, and the sealing rings are located between the rotating inner shaft and the fixed outer shell.

[0028] As a further improved technical solution of the utility model, other line channels are opened in the middle of the rotating inner shaft.

[0029] As a further improved technical solution of the utility model, the fixed outer shell and the rotating inner shaft are rotatably connected via a bearing.

[0030] The beneficial effects of the utility model are:

[0031] The swivel joint provided by the utility model adopts a method of fixing the inner shaft to rotate with an outer shell, and a double passage is arranged inside the swivel joint to transport two liquids at the same time. A reasonable space design is adopted to arrange multiple pipelines inside the swivel joint. The swivel joint of the present application is based on the traditional swivel joint that uses a sealing ring to seal and separate each flow channel, and a liquid collecting tank is arranged on the rotating inner shaft. The first to fourth liquid collecting tanks are reasonably distributed on the rotating inner shaft according to a trapezoid. At the same time, the liquid collecting tank is opened on the rotating inner shaft, so that it will not leak at all, and the sealing effect is significant. The collected leaked liquid will only be discharged from the bottom of the drainage pipe, which ensures the smooth operation of the swivel joint to a certain extent and transports oil and water to the required place. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of one side of a swivel joint provided in an embodiment of the present application.

[0033] Figure 2 This is a schematic diagram of the structure of the other side of the swivel joint provided in an embodiment of the present application.

[0034] Figure 3 A top view of the structure of the swivel joint provided in an embodiment of the present application.

[0035] Figure 4 The cross-sectional view of the waterway structure of the swivel joint provided in the embodiment of the present application, namely Figure 3 Middle AA section view.

[0036] Figure 5 The oil circuit structure cross-sectional diagram of the rotary joint provided in the embodiment of the present application is Figure 3 Middle BB cross-section.

[0037] Figure 6 The cross-sectional view of the drainage structure of the swivel joint provided in the embodiment of the present application, namely Figure 3 Middle DD section view.

[0038] Figure 7 Another cross-sectional view of the drainage structure of the swivel joint provided in the embodiment of the present application, namely Figure 3 Middle CC section.

[0039] Figure 8 Another cross-sectional view of the waterway structure of the swivel joint provided in the embodiment of the present application, namely Figure 3 Middle GG cross-section.

[0040] Fig. 9 Another cross-sectional view of the oil circuit structure of the rotary joint provided in the embodiment of the present application, namely Figure 3 Middle HH section. DETAILED DESCRIPTION

[0041] The specific implementation of the utility model is further described below according to the accompanying drawings:

[0042] like Figure 1-3 As shown, a leakproof double-channel swivel joint comprises a fixed outer shell 2 and a rotating inner shaft 1 , wherein the fixed outer shell 2 and the rotating inner shaft 1 are rotatably connected via a bearing 9 .

[0043] like Figure 4 , 8 -9, the interior of the fixed housing 2 is provided with a static water inlet pipe 41, a static water return pipe 44, a static oil inlet pipe 47, a static oil return pipe 50, a water inlet annular groove 10, a water return annular groove 11, an oil inlet annular groove 12, an oil return annular groove 13 and a housing drainage pipe, and the pipes mentioned above are flow channels. The housing drainage pipe includes a radial housing drainage pipe 53 and an axial housing drainage pipe 8. The water inlet annular groove 10, the water return annular groove 11, the oil inlet annular groove 12, and the oil return annular groove 13 all penetrate the inner wall of the fixed housing 2. One end of the radial housing drainage pipe 53 penetrates the outer wall of the fixed housing 2, and the other end penetrates the inner wall of the fixed housing 2. One end of the axial housing drainage pipe 8 penetrates the outer wall of the fixed housing 2, and the other end penetrates the bottom wall of the fixed housing 2. The static water inlet pipe 41 is a radial static water inlet pipe, the static water return pipe 44 is a radial static water return pipe, the static oil inlet pipe 47 is a radial static oil inlet pipe, and the static oil return pipe 50 is a radial static oil return pipe.

[0044] The outer surface of the fixed shell 2 is provided with multiple steps, which are respectively recorded as the first step outer wall, the second step outer wall, the third step outer wall, and the fourth step outer wall; the inner surface of the fixed shell 2 is provided with multiple steps, which are respectively recorded as the first step inner wall, the second step inner wall, the third step inner wall, and the fourth step inner wall.

[0045] The water inlet annular groove 10 is located on the first step inner wall of the fixed shell 2, the water return annular groove 11 is located on the second step inner wall of the fixed shell 2, the oil inlet annular groove 12 is located on the third step inner wall of the fixed shell 2, and the oil return annular groove 13 is located on the fourth step inner wall of the fixed shell 2; the water inlet annular groove 10, the water return annular groove 11, the oil inlet annular groove 12, and the oil return annular groove 13 are arranged from top to bottom.

[0046] One end of the static water inlet pipe 41 is marked as a radial static water inlet pipe inlet 42, which is arranged on the first stepped outer wall of the fixed housing 2, and the other end of the static water inlet pipe 41 is marked as a radial static water inlet pipe outlet 43, which is connected to the water inlet annular groove 10. One end of the static return water pipe 44 is marked as a radial static return water pipe outlet 45, which is arranged on the second stepped outer wall of the fixed housing 2, and the other end of the static return water pipe 44 is marked as a radial static return water pipe inlet 46, which is connected to the return water annular groove 11. One end of the static oil inlet pipe 47 is marked as a radial static oil inlet pipe inlet 48, which is arranged on the third stepped outer wall of the fixed housing 2, and the other end of the static oil inlet pipe 47 is marked as a radial static oil inlet pipe outlet 49, which is connected to the oil inlet annular groove 12. One end of the static oil return pipe 50 is marked as a radial static oil return pipe outlet 51, which is arranged on the fourth step outer wall of the fixed shell 2, and the other end of the static oil return pipe 50 is marked as a radial static oil return pipe inlet 52, which is connected to the oil return annular groove 13.

[0047] The interior of the rotating inner shaft 1 is provided with a dynamic water inlet pipe, a dynamic water return pipe, a dynamic oil inlet pipe, a dynamic oil return pipe, a liquid collecting tank and an inner shaft liquid discharge pipe.

[0048] like Figure 4 As shown, the dynamic water inlet pipeline includes an axial dynamic water inlet pipeline 15 and a radial dynamic water inlet pipeline 14 that are interconnected. One end of the axial dynamic water inlet pipeline 15 is marked as an axial dynamic water inlet pipeline outlet 5, and the axial dynamic water inlet pipeline outlet 5 is arranged on the top wall of the rotating inner shaft 1. One end of the radial dynamic water inlet pipeline 14 is marked as a radial dynamic water inlet pipeline inlet 16, and the radial dynamic water inlet pipeline inlet 16 is arranged on the first stepped outer wall of the rotating inner shaft 1, and the radial dynamic water inlet pipeline inlet 16 is aligned and connected with the water inlet annular groove 10 on the first stepped inner wall of the fixed outer shell 2.

[0049] like Figure 4 As shown, the dynamic return water pipeline includes an axial dynamic return water pipeline 17 and a radial dynamic return water pipeline 18 which are connected to each other. One end of the axial dynamic return water pipeline 17 is marked as the axial dynamic return water pipeline inlet 3, which is arranged on the top wall of the rotating inner shaft 1. One end of the radial dynamic return water pipeline 18 is marked as the radial dynamic return water pipeline outlet 19, which is arranged on the second stepped outer wall of the rotating inner shaft 1, and the radial dynamic return water pipeline outlet 19 is connected to the return water annular groove 11 on the second stepped inner wall of the fixed outer shell 2.

[0050] like Figure 5 As shown, the dynamic oil inlet pipeline includes an axial dynamic oil inlet pipeline 20 and a radial dynamic oil inlet pipeline 21 which are connected to each other. One end of the axial dynamic oil inlet pipeline 20 is marked as an axial dynamic oil inlet pipeline outlet 4, which is arranged on the top wall of the rotating inner shaft 1. One end of the radial dynamic oil inlet pipeline 21 is marked as a radial dynamic oil inlet pipeline inlet 22, which is arranged on the third step outer wall of the rotating inner shaft 1, and is connected to the oil inlet annular groove 12 on the third step inner wall of the fixed outer shell 2.

[0051] like Figure 5 As shown, the dynamic oil return pipeline includes an axial dynamic oil return pipeline 23 and a radial dynamic oil return pipeline 24 which are connected to each other. One end of the axial dynamic oil return pipeline 23 is marked as an axial dynamic oil return pipeline inlet 6, which is arranged on the top wall of the rotating inner shaft 1. One end of the radial dynamic oil return pipeline 24 is marked as a radial dynamic oil return pipeline outlet 25, which is arranged on the fourth step outer wall of the rotating inner shaft 1, and is connected to the oil return annular groove 13 on the fourth step inner wall of the fixed housing 2.

[0052] like Figure 6 As shown, the liquid collecting tank includes a first liquid collecting tank 26, a second liquid collecting tank 27, a third liquid collecting tank 28 and a fourth liquid collecting tank 29. The first liquid collecting tank 26 is located between the radial dynamic water inlet pipe 14 and the radial dynamic water return pipe 18, and is used to collect leaked liquid; the second liquid collecting tank 27 is located between the radial dynamic water return pipe 18 and the radial dynamic oil inlet pipe 21, and is used to collect leaked liquid; the third liquid collecting tank 28 is located between the radial dynamic oil inlet pipe 21 and the radial dynamic oil return pipe 24, and is used to collect leaked liquid; the fourth liquid collecting tank 29 is located below the radial dynamic oil return pipe 24, and is used to collect leaked liquid.

[0053] like Figure 6-7As shown, the inner shaft drainage pipeline includes a first inner shaft drainage pipeline 30, a second inner shaft drainage pipeline 33, a third inner shaft drainage pipeline 38 and a fourth inner shaft drainage pipeline 35. The top of the first inner shaft drainage pipeline 30 is marked as the first drainage pipeline inlet 31, which is connected to the first collecting tank 26, and the bottom is marked as the first drainage pipeline outlet 32, which is set at the bottom of the rotating inner shaft 1. The top of the second inner shaft drainage pipeline 33 is marked as the second drainage pipeline inlet 54, which is connected to the second collecting tank 27, and the bottom is marked as the second drainage pipeline outlet 34, which is set at the bottom of the rotating inner shaft 1. The top of the third inner shaft drainage pipeline 38 is marked as the third drainage pipeline inlet 40, which is connected to the third collecting tank 28, and the bottom is marked as the third drainage pipeline outlet 39, which is set at the bottom of the rotating inner shaft 1. The top of the fourth inner shaft drainage pipe 35 is marked as the fourth drainage pipe inlet 36 , which is connected to the fourth collecting tank 29 , and the bottom is marked as the fourth drainage pipe outlet 37 , which runs through the bottom of the rotating inner shaft 1 .

[0054] A gap 55 is provided between the bottom wall of the rotating inner shaft 1 and the inner wall of the fixed outer shell 2 , and the first inner shaft drainage pipe 30 , the second inner shaft drainage pipe 33 , the third inner shaft drainage pipe 38 and the fourth inner shaft drainage pipe 35 are all connected to the outer shell drainage pipe through the gap 55 .

[0055] Sealing rings are provided above and below each liquid collecting tank, above and below the water inlet annular groove 10, above and below the water return annular groove 11, above and below the oil inlet annular groove 12, and above and below the oil return annular groove 13, and the sealing rings are located between the fixed outer shell 2 and the rotating inner shaft 1. Specifically, the sealing rings are installed in the sealing ring grooves on the outer wall of the rotating inner shaft 1. Sealing rings are provided on both sides of the gap 55, and the sealing rings are located between the rotating inner shaft 1 and the fixed outer shell 2. The sealing rings are used to separate each flow channel and the annular groove to prevent contamination caused by the mutual circulation of liquids. At the position where the sealing rings are installed, the rotating inner shaft 1 and the fixed outer shell 2 are connected in a rotating seal.

[0056] The middle of the rotating inner shaft 1 is provided with another line channel 7, and the line can be installed to a required place through the other line channel 7 in the middle of the swivel joint.

[0057] In this embodiment, taking the water circuit operation as an example, the fixed outer shell 2 is fixed (such as the fixed outer shell 2 is connected to the chassis by screws), and the rotating inner shaft 1 is rotated by other mechanisms (such as the rotating inner shaft 1 is connected to the upper frame by screws). At the same time, external cooling water can be input from the radial static water inlet pipe inlet 42 through a water pipe (the radial static water inlet pipe inlet 42 can be a threaded port, which is convenient for threaded connection with an external water pipe), and a water inlet passage is formed through the radial static water inlet pipe 41, the water inlet annular groove 10, the radial dynamic water inlet pipe 14, the axial dynamic water inlet pipe 15, and the axial dynamic water inlet pipe outlet 5, and the water is sent to the required part for cooling through the axial dynamic water inlet pipe outlet 5. The axial dynamic water inlet pipe outlet 5 can be a threaded port, the axial dynamic water inlet pipe outlet 5 is threadedly connected to the water pipe, and is connected to the cooling inlet of the required part through the water pipe; the cooled water is input from the axial dynamic return water pipe inlet 3 (the axial dynamic return water pipe inlet 3 can be a threaded port, which is convenient for connecting to the cooling outlet of the required part through the water pipe), and returns to the water tank through the return water passage formed by the axial dynamic return water pipe 17, the radial dynamic return water pipe 18, the return water annular groove 11, the radial static return water pipe 44, and the radial static return water pipe outlet 45 for reuse; the radial static return water pipe outlet 45 is a threaded port, which is convenient for threaded connection with an external water pipe. Taking the oil circuit operation as an example, the fixed outer shell 2 is fixed (such as connected to the chassis), and the rotating inner shaft 1 is rotated by other mechanisms (such as the upper frame). At the same time, oil can be input from the radial static oil inlet pipe inlet 48 through the oil pipe, and the oil inlet passage is formed by the radial static oil inlet pipe 47, the oil inlet annular groove 12, the radial dynamic oil inlet pipe 21, and the axial dynamic oil inlet pipe 20 to be delivered to the required part; when outputting oil, it is input from the axial dynamic oil return pipe inlet 6, and returned to the oil tank through the oil return passage formed by the axial dynamic oil return pipe 23, the radial dynamic oil return pipe 24, the return oil annular groove 13, the radial static oil return pipe 50, and the radial static oil return pipe outlet 51. The radial static oil return pipe outlet 51 can be a threaded port to facilitate the threaded connection of the oil pipe.

[0058] In this embodiment, taking the operation of the water leakage prevention mechanism as an example, when one of the water circuit sealing rings fails, the leaked water will seep into the first sump 26 and the second sump 27. When the collected leaked water reaches the height of the first inner shaft drainage pipe 30 and the second inner shaft drainage pipe 33, the leaked water will flow out of the pipe and be discharged through the radial outer shell drainage pipe 53 and the axial outer shell drainage pipe 8. Taking the operation of the oil leakage prevention mechanism as an example, when one of the oil circuit sealing rings fails, the leaked oil will seep into the third sump 28 and the fourth sump 29. When the collected leaked oil reaches the height of the third inner shaft drainage pipe 38 and the fourth inner shaft drainage pipe 35, the leaked oil will flow out of the pipe and be discharged through the radial outer shell drainage pipe 53 and the axial outer shell drainage pipe 8.

[0059] 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 leakproof double-channel swivel joint, characterized in that: It comprises a fixed outer shell (2) and a rotating inner shaft (1), wherein the fixed outer shell (2) and the rotating inner shaft (1) are rotatably connected; The interior of the fixed housing (2) is provided with a static water inlet pipe (41), a static water return pipe (44), a static oil inlet pipe (47), a static oil return pipe (50), a water inlet annular groove (10), a water return annular groove (11), an oil inlet annular groove (12), an oil return annular groove (13) and a housing drainage pipe; the water inlet annular groove (10), the water return annular groove (11), the oil inlet annular groove (12) and the oil return annular groove (13) all penetrate the inner wall of the fixed housing (2); one end of the housing drainage pipe penetrates the outer wall of the fixed housing (2), and the other end penetrates the inner wall of the fixed housing (2); One end of the static water inlet pipe (41) penetrates the outer wall of the fixed housing (2), and the other end is in communication with the water inlet annular groove (10); one end of the static water return pipe (44) penetrates the outer wall of the fixed housing (2), and the other end is in communication with the water return annular groove (11); one end of the static oil inlet pipe (47) penetrates the outer wall of the fixed housing (2), and the other end is in communication with the oil inlet annular groove (12); one end of the static oil return pipe (50) penetrates the outer wall of the fixed housing (2), and the other end is in communication with the oil return annular groove (13); The rotating inner shaft (1) is provided with a dynamic water inlet pipe, a dynamic water return pipe, a dynamic oil inlet pipe, a dynamic oil return pipe, a liquid collecting tank and an inner shaft liquid discharge pipe inside; One end of the dynamic water inlet pipe penetrates the top wall of the rotating inner shaft (1), and the other end is connected to the water inlet annular groove (10); one end of the dynamic water return pipe penetrates the top wall of the rotating inner shaft (1), and the other end is connected to the water return annular groove (11); one end of the dynamic oil inlet pipe penetrates the top wall of the rotating inner shaft (1), and the other end is connected to the oil inlet annular groove (12); one end of the dynamic oil return pipe penetrates the top wall of the rotating inner shaft (1), and the other end is connected to the oil return annular groove (13); Liquid collecting tanks are arranged between the dynamic water inlet pipe and the dynamic water return pipe, between the dynamic water return pipe and the dynamic oil inlet pipe, between the dynamic oil inlet pipe and the dynamic oil return pipe, and below the dynamic oil return pipe. Each liquid collecting tank is connected to the inner shaft drainage pipe, and the inner shaft drainage pipe is connected to the outer shell drainage pipe. Sealing rings are provided above and below each liquid collecting tank, above and below the water inlet annular groove (10), above and below the water return annular groove (11), above and below the oil inlet annular groove (12), and above and below the oil return annular groove (13), and the sealing rings are located between the fixed outer shell (2) and the rotating inner shaft (1).

2. The leakproof double-channel swivel joint according to claim 1, characterized in that: The static water inlet pipe (41) is a radial static water inlet pipe, the static water return pipe (44) is a radial static water return pipe, the static oil inlet pipe (47) is a radial static oil inlet pipe, and the static oil return pipe (50) is a radial static oil return pipe.

3. The leakproof double-channel swivel joint according to claim 1, characterized in that: The outer surface of the fixed housing (2) is provided with a plurality of steps, which are respectively recorded as a first step outer wall, a second step outer wall, a third step outer wall, and a fourth step outer wall; the inner surface of the fixed housing (2) is provided with a plurality of steps, which are respectively recorded as a first step inner wall, a second step inner wall, a third step inner wall, and a fourth step inner wall; The water inlet annular groove (10) is located on the first step inner wall of the fixed housing (2), the water return annular groove (11) is located on the second step inner wall of the fixed housing (2), the oil inlet annular groove (12) is located on the third step inner wall of the fixed housing (2), and the oil return annular groove (13) is located on the fourth step inner wall of the fixed housing (2); the water inlet annular groove (10), the water return annular groove (11), the oil inlet annular groove (12), and the oil return annular groove (13) are arranged from top to bottom; One end of the static water inlet pipe (41) penetrates the first step outer wall of the fixed housing (2); one end of the static water return pipe (44) penetrates the second step outer wall of the fixed housing (2); one end of the static oil inlet pipe (47) penetrates the third step outer wall of the fixed housing (2); and one end of the static oil return pipe (50) penetrates the outer wall of the fixed housing (2).

4. The leakproof double-channel swivel joint according to claim 3, characterized in that: The dynamic water inlet pipeline comprises an axial dynamic water inlet pipeline (15) and a radial dynamic water inlet pipeline (14) which are connected to each other; one end of the axial dynamic water inlet pipeline (15) passes through the top wall of the rotating inner shaft (1); one end of the radial dynamic water inlet pipeline (14) passes through the first stepped outer wall of the rotating inner shaft (1) and is aligned and connected with the water inlet annular groove (10) on the first stepped inner wall of the fixed outer shell (2); The dynamic return water pipeline comprises an axial dynamic return water pipeline (17) and a radial dynamic return water pipeline (18) which are connected to each other; one end of the axial dynamic return water pipeline (17) passes through the top wall of the rotating inner shaft (1); one end of the radial dynamic return water pipeline (18) passes through the second stepped outer wall of the rotating inner shaft (1) and is connected to the return water annular groove (11) on the second stepped inner wall of the fixed outer shell (2); The dynamic oil inlet pipeline comprises an axial dynamic oil inlet pipeline (20) and a radial dynamic oil inlet pipeline (21) which are connected to each other, one end of the axial dynamic oil inlet pipeline (20) passes through the top wall of the rotating inner shaft (1), and one end of the radial dynamic oil inlet pipeline (21) passes through the third step outer wall of the rotating inner shaft (1) and is connected to the oil inlet annular groove (12) on the third step inner wall of the fixed outer shell (2); The dynamic oil return pipeline comprises an axial dynamic oil return pipeline (23) and a radial dynamic oil return pipeline (24) which are connected to each other. One end of the axial dynamic oil return pipeline (23) passes through the top wall of the rotating inner shaft (1), and one end of the radial dynamic oil return pipeline (24) passes through the fourth step outer wall of the rotating inner shaft (1) and is connected to the oil return annular groove (13) on the fourth step inner wall of the fixed outer shell (2).

5. The leakproof double-channel swivel joint according to claim 4, characterized in that: The plurality of liquid collecting tanks are respectively a first liquid collecting tank (26), a second liquid collecting tank (27), a third liquid collecting tank (28) and a fourth liquid collecting tank (29); The first liquid collecting tank (26) is located between the radial dynamic water inlet pipe (14) and the radial dynamic water return pipe (18); the second liquid collecting tank (27) is located between the radial dynamic water return pipe (18) and the radial dynamic oil inlet pipe (21); the third liquid collecting tank (28) is located between the radial dynamic oil inlet pipe (21) and the radial dynamic oil return pipe (24); and the fourth liquid collecting tank (29) is located below the radial dynamic oil return pipe (24).

6. The leakproof double-channel swivel joint according to claim 5, characterized in that: There are a plurality of inner shaft drainage pipes, namely a first inner shaft drainage pipe (30), a second inner shaft drainage pipe (33), a third inner shaft drainage pipe (38) and a fourth inner shaft drainage pipe (35); The top end of the first inner shaft drainage pipe (30) is connected to the first liquid collecting tank (26), and the bottom end thereof passes through the bottom wall of the rotating inner shaft (1); the top end of the second inner shaft drainage pipe (33) is connected to the second liquid collecting tank (27), and the bottom end thereof passes through the bottom wall of the rotating inner shaft (1); the top end of the third inner shaft drainage pipe (38) is connected to the third liquid collecting tank (28), and the bottom end thereof passes through the bottom wall of the rotating inner shaft (1); the top end of the fourth inner shaft drainage pipe (35) is connected to the fourth liquid collecting tank (29), and the bottom end thereof passes through the bottom wall of the rotating inner shaft (1); A gap (55) is provided between the bottom wall of the rotating inner shaft (1) and the inner wall of the fixed outer shell (2); the first inner shaft drainage pipe (30), the second inner shaft drainage pipe (33), the third inner shaft drainage pipe (38) and the fourth inner shaft drainage pipe (35) are all connected to the outer shell drainage pipe through the gap (55).

7. The leakproof double-channel swivel joint according to claim 6, characterized in that: There are two outer shell drainage pipes, namely a radial outer shell drainage pipe (53) and an axial outer shell drainage pipe (8).

8. The leakproof double-channel swivel joint according to claim 6, characterized in that: Sealing rings are provided on both sides of the gap (55), and the sealing rings are located between the rotating inner shaft (1) and the fixed outer shell (2).

9. The leakproof dual-channel swivel joint according to claim 1, characterized in that: A line channel (7) is provided in the middle of the rotating inner shaft (1).

10. The leakproof dual-channel swivel joint according to claim 1, characterized in that: The fixed outer shell (2) and the rotating inner shaft (1) are rotatably connected via a bearing (9).

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