Dual pass rotary union leak prevention method

Abstract

The application discloses a double-passage rotary joint leak-proof method, which comprises the following steps: liquid collecting tanks are arranged between a dynamic water inlet pipeline and a dynamic water return pipeline, between the dynamic water return pipeline and a dynamic oil inlet pipeline, between the dynamic oil inlet pipeline and a dynamic oil return pipeline, and below the dynamic oil return pipeline; all the liquid collecting tanks are arranged on the horizontal plane of the stepped outer wall of a rotating inner shaft; an inner shaft liquid discharge pipeline is arranged in the rotating inner shaft, so that each liquid collecting tank is communicated with the inner shaft liquid discharge pipeline; an outer shell liquid discharge pipeline is arranged on a fixed outer shell, and the inner shaft liquid discharge pipeline is communicated with the outer shell liquid discharge pipeline; a sealing ring is arranged above and below each liquid collecting tank, above and below a water inlet annular groove, above and below a water return annular groove, above and below an oil inlet annular groove, and above and below an oil return annular groove; the leak-proof method can be used on the rotary joint between a chassis and an upper frame of a excavator during work, can stably convey hydraulic oil and water, realizes oil and water conveying from the chassis to the upper frame, and has the characteristics of good sealing performance.

Description

Technical Field

[0001] This invention belongs to the field of engineering, specifically a leak-proof method for a dual-channel rotary joint. Background Technology

[0002] An excavator is a type of heavy construction machinery, mainly consisting of a chassis and a upper frame, which are connected by a slewing mechanism. This mechanism allows the excavator to rotate and position within a 360° range, enabling the chassis and upper frame to rotate independently. The most important component of the slewing mechanism is the slewing joint, which delivers oil and water from the chassis to the upper frame.

[0003] Existing similar patents include CN116641717A, which relates to a central rotary joint and a tunnel boring machine incorporating it; and CN218818818U, which describes a hydraulic-electric rotary joint used in a hydraulic robot. All of these patents involve the design of rotary joints, but after prolonged use, liquid leakage still occurs, making the device and the site difficult to clean. Therefore, it is necessary to research a leak-proof method for rotary joints, improving their leak-proof performance while also enabling the collection and drainage of leaked liquid in the event of a leak. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preventing leakage of a dual-channel rotary joint in order to overcome the shortcomings of the prior art. This method can be used on the rotary joint between the chassis and the upper frame when the excavator is working. It can stably deliver hydraulic oil and water, realize the delivery of oil and water from the chassis to the upper frame, and has the characteristics of good sealing performance.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A leak-proof method for a dual-channel rotary joint includes a dual-channel rotary joint, which comprises 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 housing 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, and an oil return annular groove; 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 housing.

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

[0009] The rotating inner shaft is internally equipped with a moving water inlet pipe, a moving water return pipe, a moving oil inlet pipe, and a moving oil return pipe.

[0010] One end of the moving 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 moving 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 moving 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 moving 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] Leak prevention methods include:

[0012] Liquid collection tanks are provided between the moving water inlet pipe and the moving return water pipe, between the moving return water pipe and the moving oil inlet pipe, between the moving oil inlet pipe and the moving oil return pipe, and below the moving oil return pipe. All liquid collection tanks are located on the outer wall of the rotating inner shaft. An inner shaft drain pipe is provided inside the rotating inner shaft so that each liquid collection tank is connected to the inner shaft drain pipe.

[0013] A drain pipe is made on the fixed shell. One end of the drain pipe passes through the outer wall of the fixed shell, and the other end passes through the inner wall of the fixed shell. The drain pipe is connected to the drain pipe.

[0014] A sealing ring is provided above and below each liquid collection tank, above and below each water inlet annular tank, above and below each water return annular tank, above and below each oil inlet annular tank, and above and below each oil return annular tank. The sealing ring is located between the fixed outer shell and the rotating inner shaft.

[0015] When the seal fails, the leaked water or oil will seep into the collection tank. When the water or oil in the collection tank reaches a certain amount, the water or oil will flow out of the fixed shell through the inner shaft drain pipe and the outer shell drain pipe.

[0016] As a further improved technical solution of the present invention, the static water inlet pipe is a radial static water inlet pipe, the static return water pipe is a radial static return water pipe, the static oil inlet pipe is a radial static oil inlet pipe, and the static oil return pipe is a radial static return oil pipe.

[0017] As a further improvement of the present invention, the outer surface of the fixed shell is provided with multiple steps, which are respectively referred to 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 is provided with multiple steps, which are respectively referred to as the first step inner wall, the second step inner wall, the third step inner wall, and the fourth step inner wall.

[0018] The water inlet annular groove is located on the inner wall of the first step of the fixed housing, the water return annular groove is located on the inner wall of the second step of the fixed housing, the oil inlet annular groove is located on the inner wall of the third step of the fixed housing, and the oil return annular groove is located on the inner wall of the fourth step of the fixed housing; 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.

[0019] One end of the static water inlet pipe penetrates the outer wall of the first step of the fixed housing; one end of the static water return pipe penetrates the outer wall of the second step of the fixed housing; one end of the static oil inlet pipe penetrates the outer wall of the third step of the fixed housing; and one end of the static oil return pipe penetrates the outer wall of the fixed housing.

[0020] As a further improved technical solution of the present invention, the moving water inlet pipe includes an axial moving water inlet pipe and a radial moving water inlet pipe that are interconnected; one end of the axial moving water inlet pipe passes through the top wall of the rotating inner shaft; one end of the radial moving water inlet pipe passes through the outer wall of the first step of the rotating inner shaft and is aligned and connected with the water inlet annular groove on the inner wall of the first step of the fixed outer shell.

[0021] The dynamic return water pipe includes an axial dynamic return water pipe and a radial dynamic return water pipe that are interconnected; one end of the axial dynamic return water pipe passes through the top wall of the rotating inner shaft; one end of the radial dynamic return water pipe passes through the outer wall of the second step of the rotating inner shaft and is connected to the return water annular groove on the inner wall of the second step of the fixed outer shell.

[0022] The moving oil inlet pipe includes an axial moving oil inlet pipe and a radial moving oil inlet pipe that are interconnected. One end of the axial moving oil inlet pipe passes through the top wall of the rotating inner shaft, and one end of the radial moving oil inlet pipe passes through the outer wall of the third step of the rotating inner shaft and is connected to the oil inlet annular groove on the inner wall of the third step of the fixed outer shell.

[0023] The dynamic return oil pipeline includes an axial dynamic return oil pipeline and a radial dynamic return oil pipeline that are interconnected. One end of the axial dynamic return oil pipeline passes through the top wall of the rotating inner shaft, and one end of the radial dynamic return oil pipeline passes through the outer wall of the fourth step of the rotating inner shaft and is connected to the return oil annular groove on the inner wall of the fourth step of the fixed outer shell.

[0024] As a further improvement of the present invention, the plurality of liquid collection tanks are respectively a first liquid collection tank, a second liquid collection tank, a third liquid collection tank and a fourth liquid collection tank;

[0025] The first liquid collection tank is located between the radial moving water inlet pipe and the radial moving water return pipe; the second liquid collection tank is located between the radial moving water return pipe and the radial moving oil inlet pipe; the third liquid collection tank is located between the radial moving oil inlet pipe and the radial moving oil return pipe; and the fourth liquid collection tank is located below the radial moving oil return pipe.

[0026] When the sealing rings above and below the inlet annular groove and above and below the return annular groove fail, the leaked water will seep into the first and second collection tanks due to gravity. When the water in the first and second collection tanks reaches a certain amount, the water will flow out of the fixed shell through the inner shaft drain pipe and the outer shell drain pipe.

[0027] When the seals above and below the oil inlet annular groove and above and below the oil return annular groove fail, the leaked oil will seep into the third and fourth collection tanks due to gravity. When the oil in the third and fourth collection tanks reaches a certain amount, the oil will flow out of the fixed housing through the inner shaft drain pipe and the outer casing drain pipe.

[0028] As a further improvement of the present invention, 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;

[0029] The top end of the first inner shaft drain pipe is connected to the first liquid collection tank, and the bottom end penetrates the bottom wall of the rotating inner shaft; the top end of the second inner shaft drain pipe is connected to the second liquid collection tank, and the bottom end penetrates the bottom wall of the rotating inner shaft; the top end of the third inner shaft drain pipe is connected to the third liquid collection tank, and the bottom end penetrates the bottom wall of the rotating inner shaft; the top end of the fourth inner shaft drain pipe is connected to the fourth liquid collection tank, and the bottom end penetrates the bottom wall of the rotating inner shaft.

[0030] A gap is provided between the bottom wall of the rotating inner shaft and the inner wall of the fixed outer shell. The first inner shaft drain pipe, the second inner shaft drain pipe, the third inner shaft drain pipe and the fourth inner shaft drain pipe are all connected to the drain pipe of the outer shell through the gap.

[0031] When the water in the first collection tank reaches the height of the top of the first inner shaft drain pipe, the water flows out of the fixed housing through the first inner shaft drain pipe and the outer housing drain pipe; when the water in the second collection tank reaches the height of the top of the second inner shaft drain pipe, the water flows out of the fixed housing through the second inner shaft drain pipe and the outer housing drain pipe; when the oil in the third collection tank reaches the height of the top of the third inner shaft drain pipe, the oil flows out of the fixed housing through the third inner shaft drain pipe and the outer housing drain pipe; when the oil in the fourth collection tank reaches the height of the top of the fourth inner shaft drain pipe, the oil flows out of the fixed housing through the fourth inner shaft drain pipe and the outer housing drain pipe.

[0032] As a further improvement of the present invention, there are two drain pipes in the outer shell, namely a radial drain pipe and an axial drain pipe.

[0033] As a further improvement of the present invention, sealing rings are provided on both sides of the gap, and the sealing rings are located between the rotating inner shaft and the fixed outer shell.

[0034] As a further improvement of the present invention, other circuit channels are provided in the middle of the rotating inner shaft.

[0035] As a further improvement of the present invention, the fixed outer shell and the rotating inner shaft are rotatably connected by bearings.

[0036] The beneficial effects of this invention are as follows:

[0037] The rotary joint provided by this invention adopts a method of fixing the outer shell and rotating the inner shaft. It features a dual-channel design inside the rotary joint, enabling the simultaneous transport of two liquids. A reasonable spatial design incorporates multiple pipelines within the rotary joint. The leak-proof method of this rotary joint, building upon the traditional rotary joint method of using sealing rings to seal and separate the various flow channels, adds a first to a fourth liquid collection tank on the rotating inner shaft. These tanks are arranged in a trapezoidal pattern on the rotating inner shaft, and are located on the horizontal wall of the stepped outer wall of the rotating inner shaft. This ensures complete leak-proof operation and a significant sealing effect. Leaking liquid will only be discharged from the bottom drain pipe of the outer shell, guaranteeing the stable operation of the rotary joint and delivering oil and water to the required locations. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of one side of the rotary joint provided in an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the other side of the rotary joint provided in the embodiment of this application.

[0040] Figure 3 This is a top view of the rotary joint provided in an embodiment of this application.

[0041] Figure 4 This is a cross-sectional view of the water channel structure of the rotary joint provided in the embodiments of this application, namely... Figure 3 Sectional view of AA.

[0042] Figure 5 This is a cross-sectional view of the oil circuit structure of the rotary joint provided in the embodiments of this application, namely... Figure 3 Cross-sectional view of the middle section (BB).

[0043] Figure 6 This is a cross-sectional view of the drainage structure of the rotary joint provided in the embodiments of this application, namely... Figure 3 Cross-sectional view of DD.

[0044] Figure 7 Another cross-sectional view of the drainage structure of the rotary joint provided in the embodiments of this application, namely Figure 3 Cross-sectional view of the middle CC section.

[0045] Figure 8Another cross-sectional view of the water channel structure of the rotary joint provided in the embodiments of this application, namely Figure 3 Cross-sectional view of GG in China.

[0046] Figure 9 Another cross-sectional view of the oil circuit structure of the rotary joint provided in the embodiments of this application, namely Figure 3 Cross-sectional view of HH section. Detailed Implementation

[0047] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0048] like Figure 1-3 As shown, this embodiment provides a dual-channel rotary joint, which includes 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 by a bearing 9.

[0049] like Figure 4 , Figure 8-9 As shown, the interior of the fixed outer casing 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, and an oil return annular groove 13. 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 outer casing 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.

[0050] The outer surface of the fixed outer shell 2 is provided with multiple steps, which are respectively referred to 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 outer shell 2 is provided with multiple steps, which are respectively referred to as the first step inner wall, the second step inner wall, the third step inner wall, and the fourth step inner wall.

[0051] The water inlet annular groove 10 is located on the inner wall of the first step of the fixed housing 2, the water return annular groove 11 is located on the inner wall of the second step of the fixed housing 2, the oil inlet annular groove 12 is located on the inner wall of the third step of the fixed housing 2, and the oil return annular groove 13 is located on the inner wall of the fourth step 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.

[0052] One end of the static water inlet pipe 41 is designated as the radial static water inlet pipe inlet 42, which is located on the outer wall of the first step of the fixed housing 2. The other end of the static water inlet pipe 41 is designated as the radial static water inlet pipe outlet 43, which is connected to the inlet annular groove 10. One end of the static water return pipe 44 is designated as the radial static water return pipe outlet 45, which is located on the outer wall of the second step of the fixed housing 2. The other end of the static water return pipe 44 is designated as the radial static water return pipe inlet 46, which is connected to the return annular groove 11. One end of the static oil inlet pipe 47 is designated as the radial static oil inlet pipe inlet 48, which is located on the outer wall of the third step of the fixed housing 2. The other end of the static oil inlet pipe 47 is designated as the radial static oil inlet pipe outlet 49, which is connected to the oil inlet annular groove 12. One end of the static return oil pipe 50 is designated as the radial static return oil pipe outlet 51, which is located on the fourth step outer wall of the fixed housing 2. The other end of the static return oil pipe 50 is designated as the radial static return oil pipe inlet 52, which is connected to the return oil annular groove 13.

[0053] The rotating inner shaft 1 is internally equipped with a moving water inlet pipe, a moving water return pipe, a moving oil inlet pipe, and a moving oil return pipe.

[0054] like Figure 4 As shown, the moving water inlet pipe includes an axial moving water inlet pipe 15 and a radial moving water inlet pipe 14 that are interconnected. One end of the axial moving water inlet pipe 15 is designated as the axial moving water inlet pipe outlet 5, which is located on the top wall of the rotating inner shaft 1. One end of the radial moving water inlet pipe 14 is designated as the radial moving water inlet pipe inlet 16, which is located on the outer wall of the first step of the rotating inner shaft 1. The radial moving water inlet pipe inlet 16 is aligned and connected with the water inlet annular groove 10 on the inner wall of the first step of the fixed outer shell 2.

[0055] like Figure 4 As shown, the dynamic return water pipe includes an axial dynamic return water pipe 17 and a radial dynamic return water pipe 18 that are interconnected. One end of the axial dynamic return water pipe 17 is designated as the axial dynamic return water pipe inlet 3, which is located on the top wall of the rotating inner shaft 1. One end of the radial dynamic return water pipe 18 is designated as the radial dynamic return water pipe outlet 19, which is located on the outer wall of the second step of the rotating inner shaft 1 and is connected to the return water annular groove 11 on the inner wall of the second step of the fixed outer casing 2.

[0056] like Figure 5As shown, the moving oil inlet pipe includes an axial moving oil inlet pipe 20 and a radial moving oil inlet pipe 21 that are interconnected. One end of the axial moving oil inlet pipe 20 is designated as the axial moving oil inlet pipe outlet 4, which is located on the top wall of the rotating inner shaft 1. One end of the radial moving oil inlet pipe 21 is designated as the radial moving oil inlet pipe inlet 22, which is located on the outer wall of the third step of the rotating inner shaft 1. The radial moving oil inlet pipe inlet 22 is connected to the oil inlet annular groove 12 on the inner wall of the third step of the fixed outer casing 2.

[0057] like Figure 5 As shown, the dynamic return oil pipeline includes an axial dynamic return oil pipeline 23 and a radial dynamic return oil pipeline 24 that are interconnected. One end of the axial dynamic return oil pipeline 23 is designated as the axial dynamic return oil pipeline inlet 6, which is located on the top wall of the rotating inner shaft 1. One end of the radial dynamic return oil pipeline 24 is designated as the radial dynamic return oil pipeline outlet 25, which is located on the outer wall of the fourth step of the rotating inner shaft 1. The radial dynamic return oil pipeline outlet 25 is connected to the return oil annular groove 13 on the inner wall of the fourth step of the fixed outer casing 2.

[0058] This embodiment also provides a leak-proof method based on the above-mentioned dual-channel rotary joint, including:

[0059] Liquid collection tanks are provided between the moving water inlet pipe and the moving return water pipe, between the moving return water pipe and the moving oil inlet pipe, between the moving oil inlet pipe and the moving oil return pipe, and below the moving oil return pipe. All liquid collection tanks are opened on the horizontal surface of the stepped outer wall of the rotating inner shaft 1. An inner shaft drain pipe is opened inside the rotating inner shaft 1 so that each liquid collection tank is connected to the inner shaft drain pipe.

[0060] A drain pipe is provided on the fixed housing 2. One end of the drain pipe passes through the outer wall of the fixed housing 2, and the other end passes through the inner wall of the fixed housing 2. The drain pipe is connected to the drain pipe.

[0061] A sealing ring is provided above and below each liquid collection 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 ring is located between the fixed outer shell 2 and the rotating inner shaft 1; specifically, the sealing ring is installed in the sealing ring groove on the outer wall of the rotating inner shaft 1.

[0062] When the sealing ring fails, the leaked water or oil will seep into the collection tank. When the water or oil in the collection tank reaches a certain amount, the water or oil will flow out of the fixed housing 2 through the inner shaft drain pipe and the outer casing drain pipe.

[0063] like Figure 6As shown, the liquid collection tank includes a first liquid collection tank 26, a second liquid collection tank 27, a third liquid collection tank 28, and a fourth liquid collection tank 29. The first liquid collection tank 26 is located between the radial moving water inlet pipe 14 and the radial moving water return pipe 18, and is used to collect leaked liquid; the second liquid collection tank 27 is located between the radial moving water return pipe 18 and the radial moving oil inlet pipe 21, and is used to collect leaked liquid; the third liquid collection tank 28 is located between the radial moving oil inlet pipe 21 and the radial moving oil return pipe 24, and is used to collect leaked liquid; the fourth liquid collection tank 29 is located below the radial moving oil return pipe 24, and is used to collect leaked liquid.

[0064] Based on the above-mentioned leak-proof method for the dual-channel rotary joint: when the sealing ring fails, leaked water or oil will seep into the collection tank. When the water or oil in the collection tank reaches a certain amount, the water or oil will flow out of the fixed housing 2 through the inner shaft drain pipe and the outer casing drain pipe. Specifically:

[0065] When the sealing rings above and below the water inlet annular groove 10 and above and below the water return annular groove 11 fail, the leaked water will seep into the first collection tank 26 and the second collection tank 27 due to gravity. When the water in the first collection tank 26 and the second collection tank 27 reaches a certain amount, the water will flow out of the fixed housing 2 through the inner shaft drain pipe and the outer shell drain pipe. When the sealing rings above and below the oil inlet annular groove 12 and above and below the oil return annular groove 13 fail, the leaked oil will seep into the third collection tank 28 and the fourth collection tank 29 due to gravity. When the oil in the third collection tank 28 and the fourth collection tank 29 reaches a certain amount, the oil will flow out of the fixed housing 2 through the inner shaft drain pipe and the outer shell drain pipe.

[0066] like Figure 6-7 As shown, the inner shaft drainage system includes 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 designated as the first drainage pipe inlet 31, which connects to the first collection tank 26. The bottom end is designated as the first drainage pipe outlet 32, which is located at the bottom of the rotating inner shaft 1. The top end of the second inner shaft drainage pipe 33 is designated as the second drainage pipe inlet 54, which connects to the second collection tank 27. The bottom end is designated as the second drainage pipe outlet 34, which is located at the bottom of the rotating inner shaft 1. The top end of the third inner shaft drainage pipe 38 is designated as the third drainage pipe inlet 40, which connects to the third collection tank 28. The bottom end is designated as the third drainage pipe outlet 39, which is located at the bottom of the rotating inner shaft 1. The top end of the fourth inner shaft drain pipe 35 is designated as the fourth drain pipe inlet 36, which is connected to the fourth collection tank 29. The bottom end is designated as the fourth drain pipe outlet 37, which passes through the bottom of the rotating inner shaft 1.

[0067] 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 drain pipe 30, the second inner shaft drain pipe 33, the third inner shaft drain pipe 38, and the fourth inner shaft drain pipe 35 are all connected to the drain pipe of the outer shell through the gap 55. 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 liquid from flowing between them and causing contamination.

[0068] At the location where the sealing ring is installed, there is a rotatable sealing connection between the rotating inner shaft 1 and the fixed outer shell 2.

[0069] The leak-proof method based on the above dual-channel rotary joint further includes: when the water in the first collection tank 26 reaches the height of the top of the first inner shaft drain pipe 30, the water flows out of the fixed housing 2 through the first inner shaft drain pipe 30 and the outer housing drain pipe; when the water in the second collection tank 27 reaches the height of the top of the second inner shaft drain pipe 33, the water flows out of the fixed housing 2 through the second inner shaft drain pipe 33 and the outer housing drain pipe; when the oil in the third collection tank 28 reaches the height of the top of the third inner shaft drain pipe 38, the oil flows out of the fixed housing 2 through the third inner shaft drain pipe 38 and the outer housing drain pipe; when the oil in the fourth collection tank 29 reaches the height of the top of the fourth inner shaft drain pipe 35, the oil flows out of the fixed housing 2 through the fourth inner shaft drain pipe 35 and the outer housing drain pipe.

[0070] The outer casing drainage system includes a radial outer casing drainage pipe 53 and an axial outer casing drainage pipe 8. One end of the radial outer casing drainage pipe 53 penetrates the outer wall of the fixed outer casing 2, and the other end penetrates the inner wall of the fixed outer casing 2. One end of the axial outer casing drainage pipe 8 penetrates the outer wall of the fixed outer casing 2, and the other end penetrates the bottom wall of the fixed outer casing 2.

[0071] The rotating inner shaft 1 has other wiring channels 7 in the middle, and the wiring can be installed to the required location by passing through the other wiring channels 7 in the middle of the rotary joint.

[0072] In this embodiment, taking water circuit operation as an example, the fixed outer shell 2 is fixed in place (e.g., the fixed outer shell 2 is connected to the chassis by screws), and the rotating inner shaft 1 is rotated by other mechanisms (e.g., the rotating inner shaft 1 is connected to the upper frame by screws). At the same time, external cooling water can be input through water pipes from the radial static water inlet pipe inlet 42 (the radial static water inlet pipe inlet 42 can be a threaded port for easy connection with external water pipes). The water inlet passage is formed by the radial static water inlet pipe 41, the water inlet annular groove 10, the radial moving water inlet pipe 14, the axial moving water inlet pipe 15, and the axial moving water inlet pipe outlet 5. The water is then delivered to the required cooling parts through the axial moving water inlet pipe outlet 5. The axial moving water inlet pipe outlet 5 can be a threaded port, and the axial moving water inlet pipe outlet 5 is threadedly connected to the water pipe, and is connected to the inlet of the part to be cooled through the water pipe; the cooled water is input from the axial moving return water pipe inlet 3 (the axial moving return water pipe inlet 3 can be a threaded port, which is convenient to connect to the outlet of the part to be cooled through the water pipe), and returns to the water tank through the return water passage formed by the axial moving return water pipe 17, the radial moving 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, so as to be reused; the radial static return water pipe outlet 45 is a threaded port, which is convenient to be threadedly connected to the external water pipe. Taking the oil circuit operation as an example, the fixed outer shell 2 is fixed (e.g., connected to the chassis), while the rotating inner shaft 1 is rotated by other mechanisms (e.g., the upper frame). At the same time, oil can be input through the oil pipe from the radial static oil inlet pipe inlet 48, 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, and delivered to the required part. When outputting oil, it is input from the axial dynamic return oil pipe inlet 6, and the oil returns to the oil tank through the return oil passage formed by the axial dynamic return oil pipe 23, the radial dynamic return oil pipe 24, the return oil annular groove 13, the radial static return oil pipe 50, and the radial static return oil pipe outlet 51. The radial static return oil pipe outlet 51 can be a threaded port to facilitate the threaded connection of the oil pipe.

[0073] In this embodiment, taking the operation of the water leakage prevention mechanism as an example, when one of the water circuit seals fails, the leaked water will seep into the first collection tank 26 and the second collection tank 27. When the collected leaked water reaches the height of the first inner shaft drain pipe 30 and the second inner shaft drain pipe 33, the leaked water will flow out of the pipes and be discharged through the radial outer shell drain pipe 53 and the axial outer shell drain pipe 8. Taking the operation of the oil leakage prevention mechanism as an example, when one of the oil circuit seals fails, the leaked oil will seep into the third collection tank 28 and the fourth collection tank 29. When the collected leaked oil reaches the height of the third inner shaft drain pipe 38 and the fourth inner shaft drain pipe 35, the leaked oil will flow out of the pipes and be discharged through the radial outer shell drain pipe 53 and the axial outer shell drain pipe 8.

[0074] 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 leak-proof method for a dual-channel rotary joint, characterized in that, It includes a dual-channel rotary joint, which includes a fixed housing (2) and a rotating inner shaft (1), and the fixed housing (2) and the rotating inner shaft (1) are rotatably connected; The interior of the fixed outer shell (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), and an oil return annular groove (13); 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 outer shell (2); One end of the static water inlet pipe (41) penetrates the outer wall of the fixed housing (2), and the other end is connected to 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 connected to 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 connected to 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 connected to the oil return annular groove (13); The rotating inner shaft (1) is provided with a moving water inlet pipe, a moving water return pipe, a moving oil inlet pipe and a moving oil return pipe inside; One end of the moving water inlet pipe passes through 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 moving water return pipe passes through 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 moving oil inlet pipe passes through 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 moving oil return pipe passes through the top wall of the rotating inner shaft (1), and the other end is connected to the oil return annular groove (13); Leak prevention methods include: Liquid collection tanks are provided between the moving water inlet pipe and the moving return water pipe, between the moving return water pipe and the moving oil inlet pipe, between the moving oil inlet pipe and the moving return oil pipe, and below the moving return oil pipe. All liquid collection tanks are opened on the horizontal surface of the stepped outer wall of the rotating inner shaft (1). An inner shaft drain pipe is opened inside the rotating inner shaft (1) so that each liquid collection tank is connected to the inner shaft drain pipe. An outer casing drain pipe is opened on the fixed outer casing (2). One end of the outer casing drain pipe passes through the outer wall of the fixed outer casing (2), and the other end passes through the inner wall of the fixed outer casing (2). The inner shaft drain pipe is connected to the outer casing drain pipe. A sealing ring is provided above and below each liquid collection 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 ring is located between the fixed outer shell (2) and the rotating inner shaft (1). When the sealing ring fails, the leaked water or oil will seep into the collection tank. When the water or oil in the collection tank reaches a certain amount, the water or oil will flow out of the fixed shell through the inner shaft drain pipe and the outer shell drain pipe (2).

2. The leak-proof method for a dual-channel rotary joint according to claim 1, characterized in that, The static water inlet pipe (41) is a radial static water inlet pipe, the static return water pipe (44) is a radial static return water 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 leak-proof method for a dual-channel rotary joint according to claim 1, characterized in that, The outer surface of the fixed shell (2) is provided with multiple steps, which are respectively referred to 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 referred to as the first step inner wall, the second step inner wall, the third step inner wall, and the fourth step inner wall. The water inlet annular groove (10) is located on the inner wall of the first step of the fixed shell (2), the water return annular groove (11) is located on the inner wall of the second step of the fixed shell (2), the oil inlet annular groove (12) is located on the inner wall of the third step of the fixed shell (2), and the oil return annular groove (13) is located on the inner wall of the fourth step 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; One end of the static water inlet pipe (41) penetrates the first step outer wall of the fixed shell (2); one end of the static water return pipe (44) penetrates the second step outer wall of the fixed shell (2); one end of the static oil inlet pipe (47) penetrates the third step outer wall of the fixed shell (2); and one end of the static oil return pipe (50) penetrates the outer wall of the fixed shell (2).

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

5. The leak-proof method for a dual-channel rotary joint according to claim 4, characterized in that, The plurality of liquid collection tanks are a first liquid collection tank (26), a second liquid collection tank (27), a third liquid collection tank (28) and a fourth liquid collection tank (29); The first liquid collection tank (26) is located between the radial moving water inlet pipe (14) and the radial moving water return pipe (18); the second liquid collection tank (27) is located between the radial moving water return pipe (18) and the radial moving oil inlet pipe (21); the third liquid collection tank (28) is located between the radial moving oil inlet pipe (21) and the radial moving oil return pipe (24); the fourth liquid collection tank (29) is located below the radial moving oil return pipe (24). When the sealing rings above and below the water inlet annular groove (10) and above and below the water return annular groove (11) fail, the leaked water will seep into the first liquid collection tank (26) and the second liquid collection tank (27) due to gravity. When the water in the first liquid collection tank (26) and the second liquid collection tank (27) reaches a certain amount, the water will flow out of the fixed shell (2) through the inner shaft drain pipe and the outer shell drain pipe. When the sealing rings above and below the oil inlet annular groove (12) and above and below the oil return annular groove (13) fail, the leaked oil will seep into the third collection tank (28) and the fourth collection tank (29) due to gravity. When the oil in the third collection tank (28) and the fourth collection tank (29) reaches a certain amount, the oil will flow out of the fixed shell (2) through the inner shaft drain pipe and the outer shell drain pipe.

6. The leak-proof method for a dual-channel rotary joint according to claim 5, characterized in that, There are multiple inner shaft drainage pipes, namely 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). The top end of the first inner shaft drain pipe (30) is connected to the first liquid collection tank (26), and the bottom end penetrates the bottom wall of the rotating inner shaft (1); the top end of the second inner shaft drain pipe (33) is connected to the second liquid collection tank (27), and the bottom end penetrates the bottom wall of the rotating inner shaft (1); the top end of the third inner shaft drain pipe (38) is connected to the third liquid collection tank (28), and the bottom end penetrates the bottom wall of the rotating inner shaft (1); the top end of the fourth inner shaft drain pipe (35) is connected to the fourth liquid collection tank (29), and the bottom end penetrates 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 drain pipe (30), the second inner shaft drain pipe (33), the third inner shaft drain pipe (38) and the fourth inner shaft drain pipe (35) are all connected to the outer shell drain pipe through the gap (55). When the water in the first collection tank (26) reaches the height of the top of the first inner shaft drain pipe (30), the water flows out of the fixed shell (2) through the first inner shaft drain pipe (30) and the outer shell drain pipe; when the water in the second collection tank (27) reaches the height of the top of the second inner shaft drain pipe (33), the water flows out of the fixed shell (2) through the second inner shaft drain pipe (33) and the outer shell drain pipe; when the oil in the third collection tank (28) reaches the height of the top of the third inner shaft drain pipe (38), the oil flows out of the fixed shell (2) through the third inner shaft drain pipe (38) and the outer shell drain pipe; when the oil in the fourth collection tank (29) reaches the height of the top of the fourth inner shaft drain pipe (35), the oil flows out of the fixed shell (2) through the fourth inner shaft drain pipe (35) and the outer shell drain pipe.

7. The leak-proof method for a dual-channel rotary joint according to claim 6, characterized in that, There are two drain pipes in the outer shell, namely a radial drain pipe (53) and an axial drain pipe (8).

8. The leak-proof method for a dual-channel rotary joint according to claim 6, characterized in that, A sealing ring is provided on both sides of the gap (55), and the sealing ring is located between the rotating inner shaft (1) and the fixed outer shell (2).

9. The leak-proof method for a dual-channel rotary joint according to claim 1, characterized in that, Other line channels (7) are opened in the middle of the rotating inner shaft (1).

10. The leak-proof method for a dual-channel rotary joint according to claim 1, characterized in that, The fixed outer shell (2) and the rotating inner shaft (1) are rotatably connected by bearings (9).

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