Rotary joint

Abstract

A rotary joint includes a housing assembly, a rotating shaft, and a sealing assembly. The housing assembly includes a first sleeve, a second sleeve, and a first end cap. The first end cap and the second sleeve are respectively disposed at opposite ends of the first sleeve. The rotating shaft and the first end cap together define a first inlet flow channel. The rotating shaft and the first sleeve together define a second inlet flow channel. The sealing assembly includes a first oil seal sleeved on the rotating shaft and located between the rotating shaft and the first end cap, a second oil seal sleeved on the rotating shaft and located between the rotating shaft and the second sleeve, a first sealing ring disposed between the first sleeve and the first end cap, and a second sealing ring disposed between the first sleeve and the second sleeve. This prevents fluid leakage.

Description

Rotary joint Technical Field

[0001] This invention relates to a rotary joint, and more particularly to a rotary joint for conveying fluid from a pipeline to a rotating device. Prior Technology

[0002] An existing rotary joint connects a pipeline to a rotating device to transport fluid from the pipeline to the rotating device. This rotary joint suffers from poor sealing, which can easily cause fluid leakage. Furthermore, the components of the rotary joint are inconvenient to assemble and disassemble, leading to inconvenience and wasted time in subsequent maintenance. Summary of the Invention

[0003] Therefore, one of the objectives of this invention is to provide a rotary joint that overcomes at least one disadvantage of the prior art.

[0004] Therefore, this novel rotary joint includes a housing assembly, a rotating shaft, and a sealing assembly.

[0005] The housing assembly includes a first sleeve, a second sleeve, and a first end cap. The first end cap and the second sleeve are respectively disposed at opposite ends of the first sleeve. A rotating shaft rotatably passes through the first sleeve, the second sleeve, and the first end cap. The rotating shaft and the first end cap together define a first inlet channel, and the rotating shaft and the first sleeve together define a second inlet channel. The sealing assembly includes a first oil seal sleeved on the rotating shaft and located between the rotating shaft and the first end cap, a second oil seal sleeved on the rotating shaft and located between the rotating shaft and the second sleeve, a first sealing ring disposed between the first sleeve and the first end cap, and a second sealing ring disposed between the first sleeve and the second sleeve.

[0006] In some embodiments, the first sleeve has a first annular end face and a second annular end face opposite to the first annular end face. The first annular end face is recessed toward the second annular end face to form a first annular positioning groove for accommodating the first sealing ring. The second annular end face is recessed toward the first annular end face to form a second annular positioning groove for accommodating the second sealing ring. The first end cap has an annular inner end face that abuts against the first annular end face and compresses the first sealing ring. The second sleeve has a third annular end face that abuts against the second annular end face and compresses the second sealing ring.

[0007] In some embodiments, the first annular end face is recessed toward the second annular end face and has a plurality of first screw holes arranged in a ring shape at intervals. The second annular end face is recessed toward the first annular end face and has a plurality of second screw holes arranged in a ring shape at intervals. The first end cap also has an outer end face opposite to the inner end face of the annulus. The first end cap has a plurality of first through holes extending between the inner end face and the outer end face of the annulus and respectively communicating with the first screw holes. The second sleeve also has a fourth annular end face opposite to the third annular end face. The second sleeve has a plurality of second through holes extending between the third annular end face and the fourth annular end face and respectively communicating with the second screw holes. The housing assembly also includes a plurality of first screws and a plurality of second screws. Each first screw passes through a corresponding first through hole and is screwed into a corresponding first screw hole. Each second screw passes through a corresponding second through hole and is screwed into a corresponding second screw hole.

[0008] In some embodiments, the housing assembly further includes a second end cap disposed on the fourth annular end face and surrounding the rotation shaft, the rotation shaft, the second sleeve, and the second end cap together defining a return flow channel, and the sealing assembly further includes a third sealing ring disposed between the second sleeve and the second end cap.

[0009] In some embodiments, the fourth annular end face is recessed toward the third annular end face to form a third annular positioning groove for accommodating the third sealing ring, and the second end cap abuts against the fourth annular end face and compresses the third sealing ring.

[0010] In some embodiments, each of the second through holes of the second sleeve is a countersunk hole, and each of the second screws is received in the corresponding second through hole without protruding from the fourth annular end face. The fourth annular end face is recessed toward the third annular end face to form a plurality of third screw holes arranged in a ring shape at intervals. The second end cap has two half-cover plates, each of which is semi-circular and abuts against the fourth annular end face and compresses the third sealing ring. Each half-cover plate has a plurality of third through holes, and each of the third through holes communicates with the corresponding third screw hole. The housing assembly also includes a plurality of third screws, each of which passes through the corresponding third through hole and is screwed into the corresponding third screw hole.

[0011] In some embodiments, the outer wall of the second sleeve is recessed inward to form a return outlet hole, and the fourth annular end face of the second sleeve is recessed toward the third annular end face to form a return groove communicating with the return outlet hole. The return groove and the return outlet hole together define the return flow channel.

[0012] In some embodiments, the housing assembly further includes a second end cap disposed at one end of the second sleeve opposite to the first sleeve and surrounding the rotation axis, the rotation axis, the second sleeve and the second end cap together defining a return flow channel, and the sealing assembly further includes a third sealing ring disposed between the second sleeve and the second end cap.

[0013] In some embodiments, the second sleeve has an annular end face with an annular positioning groove for accommodating the third sealing ring. The second end cap abuts against the annular end face and compresses the third sealing ring.

[0014] In some embodiments, the annular end face is recessed to form a plurality of screw holes arranged in a ring shape at intervals. The second end cover has two half-cover plates, each of which is semi-circular and abuts against the annular end face and compresses the third sealing ring. Each half-cover plate has a plurality of through holes, each of which communicates with the corresponding screw hole. The housing assembly also includes a plurality of screws, each of which passes through the corresponding through hole and is screwed into the corresponding screw hole.

[0015] In some embodiments, the outer circumferential surface of the rotating shaft is radially recessed to form an annular positioning groove. The rotary joint also includes a bearing assembly, which includes a bearing disposed between the rotating shaft and the first sleeve and adjacent to the second sleeve, and a retaining ring embedded in the annular positioning groove. The retaining ring stops at one end of the bearing adjacent to the second sleeve.

[0016] In some embodiments, the inner wall of the second sleeve is radially recessed to form an annular positioning groove, and the sealing assembly also includes a stop ring embedded in the annular positioning groove, the stop ring stopping at the end of the second oil seal opposite to the first sleeve.

[0017] This invention has at least the following effects: by configuring the first oil seal, the second oil seal, the first sealing ring, the second sealing ring and the third sealing ring of the sealing assembly, the rotary joint has good sealing performance, thereby preventing fluid leakage. Simple Explanation of the Diagram

[0018] Other features and effects of this invention will be clearly presented in the embodiments with reference to the drawings, wherein: Figure 1 is a perspective view of an embodiment of the novel rotary joint; Figure 2 is a cross-sectional view taken along line II-II in Figure 1; Figure 3 is an exploded perspective view of this embodiment; Figure 4 is an exploded perspective view of this embodiment; and Figure 5 is a cross-sectional view taken along line VV in Figure 1. Implementation

[0019] Before this invention is described in detail, it should be noted that similar elements are represented by the same reference numerals in the following description.

[0020] Referring to Figures 1 and 2, one embodiment of the novel rotary joint 100 includes a housing assembly 1, a rotating shaft 2, a sealing assembly 3, and a bearing assembly 4.

[0021] The housing assembly 1 includes a first sleeve 11, a second sleeve 12, and a first end cap 13. The first end cap 13 and the second sleeve 12 are respectively disposed at opposite ends of the first sleeve 11. A rotating shaft 2 is rotatably disposed through the first sleeve 11, the second sleeve 12, and the first end cap 13. The rotating shaft 2 is used to connect to a rotating device (not shown). The rotating shaft 2 and the first end cap 13 together define a first input flow channel F1. The rotating shaft 2 and the first sleeve 11 together define a second input flow channel F2. The first input flow channel F1 is used to deliver a high-pressure fluid, such as actuating oil, to the rotating device. The second input flow channel F2 is used to deliver a low-pressure fluid, such as cooling lubricating oil, to the space between the housing assembly 1 and the rotating shaft 2, and to the rotating device, for lubrication and cooling of the aforementioned components.

[0022] The sealing assembly 3 includes a first oil seal 31 fitted between the rotating shaft 2 and the first end cap 13, a second oil seal 32 fitted between the rotating shaft 2 and the second sleeve 12, a first sealing ring 33 disposed between the first sleeve 11 and the first end cap 13, and a second sealing ring 34 disposed between the first sleeve 11 and the second sleeve 12. The first oil seal 31 tightly abuts against the rotating shaft 2 and the first end cap 13 to create a good seal between them, thereby reducing fluid leakage from the first input channel F1 to the second input channel F2. The second oil seal 32 tightly abuts against the rotating shaft 2 and the second sleeve 12 to create a good seal between them, thereby preventing fluid leakage from the second input channel F2 through the space between the rotating shaft 2 and the second sleeve 12. The first sealing ring 33 and the second sealing ring 34 are made of rubber or silicone. The first sealing ring 33 tightly abuts against the first sleeve 11 and the first end cap 13 to create a good seal between them, preventing fluid in the second input channel F2 from leaking through the space between the first sleeve 11 and the first end cap 13. The second sealing ring 34 tightly abuts against the first sleeve 11 and the second sleeve 12 to create a good seal between them, preventing fluid in the second input channel F2 from leaking through the space between the first sleeve 11 and the second sleeve 12. This ensures that the rotary joint 100 has good sealing properties, thereby preventing fluid leakage.

[0023] Referring to Figures 2, 3, and 4, the inner wall of the first sleeve 11 is radially recessed to form an annular groove 111 surrounding the rotating shaft 2. The outer wall of the first sleeve 11 is recessed inward to form a side inlet 112 communicating with the annular groove 111. The side inlet 112 is used to input the low-pressure fluid. The first end cap 13 has an inlet 131 corresponding to the axis of the rotating shaft 2. The inlet 131 is used to input the high-pressure fluid. The rotating shaft 2 has a central through hole 21 and a plurality of side through holes 22 spaced apart from each other around the central through hole 21. The central through hole 21 extends along the axis of the rotating shaft 2 and communicates with the inlet 131. The central through hole 21 and the inlet 131 together define the first input flow channel F1. The side through holes 22 communicate with the annular groove 111. The side through hole 22, the annular groove 111, and the side inlet hole 112 together define the second input flow channel F2.

[0024] Referring to Figures 2, 3, 4, and 5, the first sleeve 11 has a first annular end face 113 and a second annular end face 114 opposite to the first annular end face 113. The first annular end face 113 is recessed towards the second annular end face 114 to form a first annular positioning groove 115 for accommodating the first sealing ring 33. The second annular end face 114 is recessed towards the first annular end face 113 to form a second annular positioning groove 116 for accommodating the second sealing ring 34. The first end cap 13 has an annular inner end face 132 that abuts against the first annular end face 113 and compresses the first sealing ring 33. The second sleeve 12 has a third annular end face 121 that abuts against the second annular end face 114 and compresses the second sealing ring 34.

[0025] The first annular end face 113 is recessed toward the second annular end face 114 and has a plurality of first screw holes 117 arranged in a ring shape at intervals. The second annular end face 114 is recessed toward the first annular end face 113 and has a plurality of second screw holes 118 arranged in a ring shape at intervals. The first end cap 13 also has an outer end face 133 opposite to the inner annular end face 132. The first end cap 13 has a plurality of first through holes 134 extending between the inner annular end face 132 and the outer end face 133 and respectively communicating with the first screw holes 117. The second sleeve 12 also has a fourth annular end face 122 opposite to the third annular end face 121. The second sleeve 12 has a plurality of second through holes 123 extending between the third annular end face 121 and the fourth annular end face 122 and respectively communicating with the second screw holes 118. The housing assembly 1 also includes a plurality of first screws 14 and a plurality of second screws 15. Each of the first screws 14 passes through the corresponding first through hole 134 and is screwed into the corresponding first screw hole 117 to secure the first end cap 13 to the first sleeve 11. Each of the second screws 15 passes through the corresponding second through hole 123 and is screwed into the corresponding second screw hole 118 to secure the second sleeve 12 to the first sleeve 11.

[0026] To assemble the first sealing ring 33 between the first sleeve 11 and the first end cap 13, the first sealing ring 33 is first placed in the first annular positioning groove 115, with a portion of the first sealing ring 33 protruding from the first annular end face 113. Next, the first through holes 134 of the first end cap 13 are aligned with the first screw holes 117 of the first sleeve 11. Subsequently, the inner annular end face 132 of the first end cap 13 is moved toward the first annular end face 113. During this movement, the inner annular end face 132 gradually compresses and deforms the first sealing ring 33, increasing the contact area between the inner annular end face 132 and the first sealing ring 33. When the inner annular end face 132 abuts against the first annular end face 113, the inner annular end face 132 can no longer move. At this time, the first sealing ring 33 is in close contact with the inner end face 132 of the annulus, and the first through holes 134 are respectively connected to the first screw holes 117. Then, each of the first screws 14 is passed through the corresponding first through hole 134 and screwed into the corresponding first screw hole 117 to lock the first end cap 13 to the first sleeve 11, and the first sealing ring 33 is assembled and fixed between the first sleeve 11 and the first end cap 13.

[0027] To remove the first sealing ring 33 from the first sleeve 11 and the first end cap 13, loosen each of the first screws 14 to separate it from the corresponding first screw hole 117. Then, move the annular inner end face 132 of the first end cap 13 away from the first annular end face 113 of the first sleeve 11, exposing the first annular positioning groove 115 and the first sealing ring 33. At this point, the first sealing ring 33 can be removed from the first annular positioning groove 115.

[0028] Because the assembly and disassembly of the first sealing ring 33 is simple and convenient, it facilitates subsequent maintenance or replacement of the first sealing ring 33 and saves operating time. Furthermore, during the assembly process where the inner end face 132 of the annulus moves towards the first annulus end face 113, the inner end face 132 gradually compresses the first sealing ring 33, thereby gradually increasing the contact area with the first sealing ring 33. This allows the restoring elastic force generated by the deformation of the first sealing ring 33 to be directly applied to the inner end face 132 of the annulus. This ensures excellent stability of the first sealing ring 33 in close contact with the inner end face 132 of the annulus, thereby improving the sealing performance between the inner end face 132 and the first annulus end face 113.

[0029] To assemble the second sealing ring 34 between the first sleeve 11 and the second sleeve 12, the second sealing ring 34 is first placed in the second annular positioning groove 116, with a portion of the second sealing ring 34 protruding from the second annular end face 114. Next, the second through holes 123 of the second sleeve 12 are aligned with the second threaded holes 118 of the first sleeve 11. Subsequently, the third annular end face 121 of the second sleeve 12 is moved toward the second annular end face 114. During this movement, the third annular end face 121 gradually compresses and deforms the second sealing ring 34, increasing the contact area between the third annular end face 121 and the second sealing ring 34. When the third annular end face 121 abuts against the second annular end face 114, it can no longer move. At this time, the second sealing ring 34 is in close contact with the third annular end face 121, and the second through holes 123 are respectively connected to the second screw holes 118. Then, each of the second screws 15 is passed through the corresponding second through hole 123 and screwed into the corresponding second screw hole 118 to lock the second sleeve 12 to the first sleeve 11, and the second sealing ring 34 is assembled and fixed between the first sleeve 11 and the second sleeve 12.

[0030] To remove the second sealing ring 34 from between the first sleeve 11 and the second sleeve 12, loosen each of the second screws 15 to separate it from the corresponding second screw hole 118. Then, move the third annular end face 121 of the second sleeve 12 away from the second annular end face 114 of the first sleeve 11, exposing the second annular positioning groove 116 and the second sealing ring 34. At this point, the second sealing ring 34 can be removed from the second annular positioning groove 116.

[0031] Because the second sealing ring 34 is simple and convenient to assemble and disassemble, it facilitates subsequent maintenance or replacement, saving time. Furthermore, during the assembly process where the third annular end face 121 moves toward the second annular end face 114, the third annular end face 121 gradually compresses the second sealing ring 34, thereby gradually increasing the contact area with the second sealing ring 34. This allows the restoring elastic force generated by the deformation of the second sealing ring 34 to be directly applied to the third annular end face 121. This ensures excellent stability of the second sealing ring 34 in close contact with the third annular end face 121, thereby improving the sealing performance between the second sealing ring 34 and the third annular end face 121 and the second annular end face 114.

[0032] Referring to Figures 2, 3, and 4, the housing assembly 1 further includes a second end cap 16. The second end cap 16 is disposed at the end of the second sleeve 12 opposite to the first sleeve 11 and surrounds the rotating shaft 2. The rotating shaft 2, the second sleeve 12, and the second end cap 16 together define a return flow channel F3. The return flow channel F3 is used to transport the returned fluid to discharge it from the rotary joint 100. The sealing assembly 3 further includes a third sealing ring 35 disposed between the second sleeve 12 and the second end cap 16. The third sealing ring 35 is made of rubber or silicone. The third sealing ring 35 tightly abuts against the second sleeve 12 and the second end cap 16 to create a good seal between them, preventing fluid in the return flow channel F3 from leaking through the second sleeve 12 and the second end cap 16.

[0033] The outer wall of the second sleeve 12 is recessed inward to form a return outlet hole 124. The fourth annular end face 122 of the second sleeve 12 is recessed toward the third annular end face 121 to form a return groove 125 communicating with the return outlet hole 124. The return groove 125 and the return outlet hole 124 together define the return flow channel F3. The returned fluid can flow sequentially through the return groove 125 and the return outlet hole 124 to be discharged from the rotary joint 100.

[0034] Referring to Figures 2, 4, and 5, the fourth annular end face 122 of the second sleeve 12 is recessed towards the third annular end face 121 to form a third annular positioning groove 126 for accommodating the third sealing ring 35. The second end cap 16 abuts against the fourth annular end face 122 and compresses the third sealing ring 35. The fourth annular end face 122 is recessed towards the third annular end face 121 to form a plurality of third screw holes 127 arranged in a ring shape at intervals. The second end cap 16 has two half-cover plates 161. Each half-cover plate 161 is semi-circular. Each half-cover plate 161 abuts against the fourth annular end face 122 and compresses the third sealing ring 35. Each half-cover plate 161 has a plurality of third through holes 162. Each third through hole 162 communicates with a corresponding third screw hole 127. The housing assembly 1 also includes a plurality of third screws 17. Each of the third screws 17 passes through the corresponding third through hole 162 and is screwed into the corresponding third screw hole 127 to secure the corresponding half cover plate 161 to the second sleeve 12.

[0035] Each of the second through holes 123 of the second sleeve 12 is a countersunk hole. The screw head of each of the second screws 15 is accommodated in the corresponding second through hole 123 without protruding from the fourth annular end face 122. In this way, each of the half-covers 161 can abut against the fourth annular end face 122 without being obstructed by the screw head of the second screw 15.

[0036] To assemble the third sealing ring 35 between the second sleeve 12 and the second end cap 16, the third sealing ring 35 is first placed in the third annular positioning groove 126, with a portion of the third sealing ring 35 protruding from the fourth annular end face 122. The third through holes 162 of each half-cover plate 161 are aligned with the corresponding third screw holes 127 of the second sleeve 12. Then, each half-cover plate 161 is moved toward the fourth annular end face 122. During this movement, the third sealing ring 35 is gradually compressed and deformed, increasing the contact area between the half-cover plate 161 and the third sealing ring 35. When the half-cover plate 161 abuts against the fourth annular end face 122, it can no longer move. At this time, the third sealing ring 35 is in close contact with the half cover plate 161, and the third through holes 162 of the half cover plate 161 are respectively connected to the corresponding third screw holes 127. Then, each of the third screws 17 is passed through the corresponding third through hole 162 and screwed into the corresponding third screw hole 127 to lock the corresponding half cover plate 161 to the second sleeve 12, and the third sealing ring 35 is assembled and fixed between the second sleeve 12 and the second end cap 16.

[0037] To remove the third sealing ring 35 from between the second sleeve 12 and the second end cap 16, loosen each of the third screws 17 to separate it from the corresponding third screw hole 127. Then, move each half-cap 161 away from the fourth annular end face 122 of the second sleeve 12, exposing the third annular positioning groove 126 and the third sealing ring 35. At this point, the third sealing ring 35 can be removed from the third annular positioning groove 126.

[0038] Because the disassembly and assembly of the third sealing ring 35 is simple and convenient, it facilitates subsequent maintenance or replacement of the third sealing ring 35 and saves operating time. Furthermore, during the assembly process where the half-cover plate 161 moves towards the fourth annular end face 122, the half-cover plate 161 gradually compresses the third sealing ring 35, thereby gradually increasing the contact area with the third sealing ring 35. This allows the restoring elastic force generated by the deformation of the third sealing ring 35 to be directly applied to the half-cover plate 161. This ensures excellent stability of the third sealing ring 35 in close contact with the half-cover plate 161, thereby improving the sealing performance of the third sealing ring 35 between the second end cover 16 and the fourth annular end face 122. Furthermore, the design of the half-cover plates 161 of the second end cap 16 ensures that the half-cover plates 161 are not obstructed by the flange 23 of the rotating shaft 2 during the assembly and disassembly of the fourth annular end face 122 of the second sleeve 12, thereby improving the ease of assembly and disassembly of the second end cap 16. Moreover, by forming the return groove 125 with the second sleeve 12 and by detachably assembling the second end cap 16 to the fourth annular end face 122 of the second sleeve 12, the complexity of the structural design and the processing cost can be reduced.

[0039] Referring to Figures 2, 3, and 4, the bearing assembly 4 includes two bearings 41 and 42. Bearing 41 is disposed between the rotating shaft 2 and the first sleeve 11, and adjacent to the first end cap 13, and is held by the first sleeve 11 and the first end cap 13. Bearing 42 is disposed between the rotating shaft 2 and the first sleeve 11, and adjacent to the second sleeve 12, and is held by the first sleeve 11 and the second sleeve 12. An annular positioning groove 24 is radially recessed on the outer circumferential surface of the rotating shaft 2. The bearing assembly 4 also includes a retaining ring 43 embedded in the annular positioning groove 24. The retaining ring 43 is exemplified by a C-shaped retaining ring, but is not limited thereto. The retaining ring 43 stops at one end of the bearing 42 adjacent to the second sleeve 12. This improves the stability of the bearing 42 in the rotation shaft 2, prevents the bearing 42 from sliding along the axial direction of the rotation shaft 2, ensures the bearing 42 can operate normally, and thus extends the service life of the bearing 42.

[0040] The inner wall of the second sleeve 12 is radially recessed to form an annular positioning groove 128. The sealing assembly 3 also includes a retaining ring 36 embedded in the annular positioning groove 128. The retaining ring 36 is exemplified by a C-shaped retaining ring, but is not limited thereto. The retaining ring 36 stops at the end of the second oil seal 32 opposite to the first sleeve 11. This improves the stability of the second oil seal 32 in the rotation shaft 2, prevents the second oil seal 32 from sliding axially along the rotation shaft 2, ensures the normal operation of the second oil seal 32, and thus extends the service life of the second oil seal 32.

[0041] In summary, the rotary joint 100 of this embodiment, through the arrangement of the first oil seal 31, the second oil seal 32, the first sealing ring 33, the second sealing ring 34 and the third sealing ring 35 of the sealing component 3, enables the rotary joint 100 to have good sealing performance, thereby preventing fluid leakage, and thus effectively achieving the purpose of this invention.

[0042] However, the above description is merely an embodiment of this invention and should not be construed as limiting the scope of implementation of this invention. Any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the patent specification shall still fall within the scope of this invention.

[0043] 100: Rotary joint 1: Housing assembly 11: First Sleeve 111: Annular groove 112: Side entry hole 113: First annular end face 114: Second annular end face 115: First annular positioning groove 116: Second annular positioning groove 117: First screw hole 118: Second screw hole 12: Second sleeve 121: Third annular end face 122: Fourth annular end face 123: Second perforation 124: Return outlet 125: Reflux Tank 126: Third annular positioning groove 127: Third screw hole 128: Circular positioning groove 13: First end cap 131: Access Hole 132: Inner end face of the ring 133: Outer end face 134: First perforation 14: First screw 15: Second screw 16: Second end cap 161: Half cover plate 162: Third perforation 17: Third screw 2: Rotation axis 21: Center through hole 22: Side through hole 23: Flange 24: Circular positioning groove 3: Sealing components 31: First oil seal 32: Second oil seal 33: First sealing ring 34: Second sealing ring 35: Third sealing ring 36: Stop ring 4: Bearing assembly 41, 42: Bearings 43: Stop ring F1: First Input Channel F2: Second Input Channel F3: Return Flow Channel

Claims

1. A rotary joint, comprising: a housing assembly including a first sleeve, a second sleeve, and a first end cap, the first end cap and the second sleeve being respectively disposed at opposite ends of the first sleeve; a rotating shaft rotatably passing through the first sleeve, the second sleeve, and the first end cap, the rotating shaft and the first end cap jointly defining a first input flow channel, the rotating shaft and the first sleeve jointly defining a second input flow channel; and a sealing assembly including a first oil seal sleeved on the rotating shaft and located between the rotating shaft and the first end cap, a second oil seal sleeved on the rotating shaft and located between the rotating shaft and the second sleeve, a first sealing ring disposed between the first sleeve and the first end cap, and a second sealing ring disposed between the first sleeve and the second sleeve.

2. The rotary joint as described in claim 1, wherein, The first sleeve has a first annular end face and a second annular end face opposite to the first annular end face. The first annular end face is recessed toward the second annular end face to form a first annular positioning groove for accommodating the first sealing ring. The second annular end face is recessed toward the first annular end face to form a second annular positioning groove for accommodating the second sealing ring. The first end cap has an annular inner end face that abuts against the first annular end face and compresses the first sealing ring. The second sleeve has a third annular end face that abuts against the second annular end face and compresses the second sealing ring.

3. The rotary joint as described in claim 2, wherein, The first annular end face is recessed toward the second annular end face and has a plurality of first screw holes arranged in a ring shape at intervals. The second annular end face is recessed toward the first annular end face and has a plurality of second screw holes arranged in a ring shape at intervals. The first end cap also has an outer end face opposite to the inner end face of the annulus. The first end cap has a plurality of first through holes extending between the inner end face and the outer end face of the annulus and respectively communicating with the first screw holes. The second sleeve also has a fourth annular end face opposite to the third annular end face. The second sleeve has a plurality of second through holes extending between the third annular end face and the fourth annular end face and respectively communicating with the second screw holes. The housing assembly also includes a plurality of first screws and a plurality of second screws. Each first screw passes through a corresponding first through hole and is screwed into a corresponding first screw hole. Each second screw passes through a corresponding second through hole and is screwed into a corresponding second screw hole.

4. The rotary joint as described in claim 3, wherein, The housing assembly also includes a second end cap disposed on the fourth annular end face and surrounding the rotation shaft, the rotation shaft, the second sleeve and the second end cap together defining a return flow channel, and the sealing assembly also includes a third sealing ring disposed between the second sleeve and the second end cap.

5. The rotary joint as described in claim 4, wherein, The fourth annular end face is recessed toward the third annular end face to form a third annular positioning groove for accommodating the third sealing ring, and the second end cap abuts against the fourth annular end face and compresses the third sealing ring.

6. The rotary joint as described in claim 5, wherein, Each of the second through holes in the second sleeve is a countersunk hole, and each of the second screws is accommodated in the corresponding second through hole without protruding from the fourth annular end face. The fourth annular end face is recessed toward the third annular end face to form a plurality of third screw holes arranged in a ring shape at intervals. The second end cap has two half-cover plates, each of which is semi-circular and abuts against the fourth annular end face and compresses the third sealing ring. Each of the half-cover plates has a plurality of third through holes, and each of the third through holes communicates with the corresponding third screw hole. The housing assembly also includes a plurality of third screws, each of which passes through the corresponding third through hole and is screwed into the corresponding third screw hole.

7. The rotary joint as claimed in any one of claims 4 to 6, wherein, The outer wall of the second sleeve is recessed inward to form a return outlet hole, and the fourth annular end face of the second sleeve is recessed towards the third annular end face to form a return groove communicating with the return outlet hole. The return groove and the return outlet hole together define the return flow channel.

8. The rotary joint as described in claim 1, wherein, The housing assembly also includes a second end cap disposed at one end of the second sleeve opposite to the first sleeve and surrounding the rotation shaft, the rotation shaft, the second sleeve and the second end cap together defining a return flow channel, and the sealing assembly also includes a third sealing ring disposed between the second sleeve and the second end cap.

9. The rotary joint as described in claim 8, wherein, The second sleeve has an annular end face, which is recessed to form an annular positioning groove for accommodating the third sealing ring. The second end cap abuts against the annular end face and compresses the third sealing ring.

10. The rotary joint as described in claim 9, wherein, The annular end face is recessed and has a plurality of screw holes arranged in a ring shape at intervals. The second end cover has two half-cover plates, each of which is semi-circular and abuts against the annular end face and compresses the third sealing ring. Each half-cover plate has a plurality of through holes, each of which communicates with the corresponding screw hole. The housing assembly also includes a plurality of screws, each of which passes through the corresponding through hole and is screwed into the corresponding screw hole.

11. The rotary joint as described in claim 1, wherein, The outer circumferential surface of the rotating shaft is radially recessed to form an annular positioning groove. The rotary joint also includes a bearing assembly, which includes a bearing disposed between the rotating shaft and the first sleeve and adjacent to the second sleeve, and a stop ring embedded in the annular positioning groove. The stop ring stops at one end of the bearing adjacent to the second sleeve.

12. The rotary joint as described in claim 1, wherein, The inner wall of the second sleeve is radially recessed to form an annular positioning groove. The sealing assembly also includes a stop ring embedded in the annular positioning groove, which stops at the end of the second oil seal opposite to the first sleeve.

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