A high speed rotary joint

Abstract

The utility model discloses a high -speed rotary joint, it includes: oil distribution bushing, oil distribution axle, axle sleeve and rotating bearing, and oil distribution bushing and axle sleeve are provided with cooperation gap, and oil distribution bushing and axle sleeve still are provided with multiple sets of sealing element, the oil distribution bushing is set up with a plurality of first radial oil hole that stretches out along the radial and is independent intercommunication with every oil ring groove, and the axle sleeve is set up with a plurality of second radial oil hole that stretches out along the radial and is independent intercommunication with every oil ring groove, and the oil distribution axle is set up with a plurality of axial oil hole that stretches out along the axial and end and every oil ring groove independent intercommunication, and the oil distribution axle and axle sleeve still are provided with smooth ceramic coating, the utility model discloses through the smooth ceramic coating between oil distribution axle and axle sleeve to replace traditional sealing ring seal, utilize the high strength, high heat -resistant characteristics of ceramic, effectively avoided the sealing ring of plastic material material early aging, the problem of heat deformation influence sealing effect.

Description

Technical fields:

[0001] This utility model relates to the field of hydraulic and pneumatic transmission technology, and specifically to a high-speed rotary joint. Background technology:

[0002] A rotary joint is a sealed connection device that enables media transfer between static and dynamic rotating systems. Its core function is to maintain stable fluid (gas / liquid) transfer under relative motion. Simply put, a rotary joint consists of a rotating component (rotor) and a stationary component (stator). The rotor rotates with the equipment, and the stator is connected to a fixed pipeline. The sealing function of the rotary joint is particularly important; a good seal is essential to prevent media leakage.

[0003] Currently available rotary joints typically use internal sealing rings to isolate each air passage or oil passage. For example, Chinese utility model patent application CN202597969U discloses a high-speed rotary joint, which includes: an upper housing, a lower housing, a bearing, a connector, a stationary ring, a rotating ring, a metal bellows, a soft graphite ring, and a sealing anti-rotation ring. The end section of the upper housing is connected and fixed to the beginning section of the lower housing, and the middle section of the connector is rotatably mounted on the end section of the inner hole of the lower housing via a bearing. It features a simple structure, good sealing performance, and high pressure resistance.

[0004] However, the existing sealing mechanism of rotary joints is achieved by sealing an anti-rotation ring (i.e., a sealing ring). In order to achieve a sealing effect, the sealing ring usually adopts an interference fit with the two mating parts. Therefore, when the two mating parts move relative to each other, a lot of frictional resistance will be generated. This not only affects the rotation speed of the rotary joint, but also the sealing ring is usually made of plastic and cannot withstand high temperatures. When the rotating shaft rotates at high speed, the sealing ring is prone to premature aging and heat deformation, which affects the sealing effect and further limits the rotation speed of the rotary joint.

[0005] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-speed rotary joint.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high-speed rotary joint, comprising: an oil distribution sleeve, an oil distribution shaft passing through the oil distribution sleeve, several bushings axially sleeved on the oil distribution shaft, and a rotary bearing disposed between the oil distribution sleeve and the oil distribution shaft. A fitting clearance is provided between the oil distribution sleeve and the bushings, and multiple sets of sealing elements are also provided between the oil distribution sleeve and the bushings. Several axially spaced oil guide ring grooves are provided between the bushings and the oil distribution sleeve. The oil distribution sleeve has multiple first radial oil holes extending radially and independently communicating with each of the oil guide ring grooves. The bushings have multiple second radial oil holes extending radially and independently communicating with each of the oil guide ring grooves. The oil distribution shaft has multiple axially extending axial oil holes with ends independently communicating with each oil guide ring groove. A smooth ceramic coating is also provided between the oil distribution shaft and the bushings.

[0008] Furthermore, in the above technical solution, the bushing includes a first bushing, a second bushing, a third bushing, and a fourth bushing arranged axially on the oil distribution shaft.

[0009] Furthermore, in the above technical solution, the oil guide ring groove includes a first ring groove disposed on the first bushing, a second ring groove disposed on the second bushing, a third ring groove disposed on the third bushing, and a fourth ring groove disposed on the fourth bushing.

[0010] Furthermore, in the above technical solution, the sealing element includes at least two sealing rings that are sleeved on the bushing and spaced apart along the axial direction.

[0011] Furthermore, in the above technical solution, the first radial oil hole includes a first radial hole, a second radial hole, a third radial hole, and a fourth radial hole distributed on the oil distribution sleeve.

[0012] Furthermore, in the above technical solution, the second radial oil hole includes a fifth diaphragm hole disposed on the first bushing, a sixth diaphragm hole disposed on the second bushing, a seventh diaphragm hole disposed on the third bushing, and an eighth diaphragm hole disposed on the fourth bushing.

[0013] Furthermore, in the above technical solution, the axial oil hole includes a first shaft hole, a second shaft hole, a third shaft hole, and a fourth shaft hole distributed on the oil distribution shaft.

[0014] Furthermore, in the above technical solution, the first diameter hole is connected to the first annular groove, the second diameter hole is connected to the second annular groove, the third diameter hole is connected to the third annular groove, and the fourth diameter hole is connected to the fourth annular groove; the first shaft hole is connected to the fifth diameter hole, the second shaft hole is connected to the sixth diameter hole, the third shaft hole is connected to the seventh diameter hole, and the fourth shaft hole is connected to the eighth diameter hole.

[0015] Furthermore, in the above technical solution, the rotating bearing includes a first bearing and a second bearing located at both ends of the oil distribution sleeve and the oil distribution shaft, respectively.

[0016] Furthermore, in the above technical solution, the lower end of the oil distribution sleeve is also provided with a lower end cap; the inner wall of the oil distribution sleeve is provided with multiple grooves for accommodating the sealing ring.

[0017] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: In this utility model, a smooth ceramic coating is set between the oil distribution shaft and the bushing to replace the traditional sealing ring. Utilizing the high strength and high heat resistance of ceramics, the problem of premature aging and heat deformation affecting the sealing effect of plastic sealing rings is effectively avoided, effectively improving the heat resistance and sealing performance of the structure, making it suitable for widespread application in various rotary joint structures. Secondly, the smooth ceramic coating reduces the resistance between the bushing and the oil distribution shaft, greatly increasing the rotational speed of the rotary joint and expanding its adaptability. Furthermore, compared with existing structures, this utility model has a fitting gap between the oil distribution sleeve and the bushing, and multiple sets of seals fill this gap to achieve a fixed assembly between the oil distribution sleeve and the bushing. The seals do not contact the oil distribution shaft and are not affected by high temperatures, meaning the rotary joint can withstand higher temperatures. For example, a traditional sealing ring can withstand 200°C, while the ceramic coating seal can withstand 400°C without affecting the rotational speed of the rotary joint. Attached image description:

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a top view of the structure of this utility model;

[0020] Figure 3 yes Figure 2 A cross-sectional schematic diagram of BB;

[0021] Figure 4 yes Figure 3 Enlarged view at point C;

[0022] Figure 5 yes Figure 2 A schematic diagram of the cross section of AA. Detailed implementation method:

[0023] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0024] See Figures 1 to 5As shown, a high-speed rotary joint includes: an oil distribution sleeve 1, an oil distribution shaft 2 passing through the oil distribution sleeve 1, several bushings 3 axially sleeved on the oil distribution shaft 2, and a rotary bearing disposed between the oil distribution sleeve 1 and the oil distribution shaft 2. A fitting clearance 4 is provided between the oil distribution sleeve 1 and the bushings 3, and multiple sets of seals are also provided between the oil distribution sleeve 1 and the bushings 3. Several axially spaced oil guide ring grooves 11 are provided between the bushings 3 and the oil distribution sleeve 1. The oil distribution sleeve 1 has multiple first radial oil holes that extend radially and are independently connected to each of the oil guide ring grooves 11. The bushings 3 have multiple second radial oil holes that extend radially and are independently connected to each of the oil guide ring grooves 11. The oil distribution shaft 2 has several axially extending axial oil holes with ends that are independently connected to each of the oil guide ring grooves 11. A smooth ceramic coating 201 is also provided between the oil distribution shaft 2 and the bushings 3.

[0025] In this invention, a smooth ceramic coating 201 is applied between the oil distribution shaft 2 and the bushing 3 to replace the traditional sealing ring. Utilizing the high strength and heat resistance of ceramics, this effectively avoids the premature aging and heat deformation issues associated with plastic sealing rings, thus improving the structure's heat resistance and sealing performance. This makes it suitable for application in various rotary joint structures. Secondly, the smooth ceramic coating 201 minimizes the resistance between the bushing 3 and the oil distribution shaft 2, significantly increasing the rotary joint's rotational speed and expanding its adaptability. Furthermore, compared to existing structures, this invention features a fitting gap 4 between the oil distribution sleeve 1 and the bushing 3, filled with multiple sets of seals to achieve a fixed assembly between them. The seals do not contact the oil distribution shaft 2 and are not affected by high temperatures, allowing the rotary joint to withstand higher temperatures. For example, while traditional sealing rings can withstand 200°C, the ceramic coating seal can withstand 400°C without affecting the rotary joint's rotational speed.

[0026] The bushing 3 includes a first bushing 31, a second bushing 32, a third bushing 33, and a fourth bushing 34 arranged axially on the oil distribution shaft 2.

[0027] The oil guide ring groove 11 includes a first ring groove 111 disposed on the first bushing 31, a second ring groove 112 disposed on the second bushing 32, a third ring groove 113 disposed on the third bushing 33, and a fourth ring groove 114 disposed on the fourth bushing 34.

[0028] The sealing element includes at least two sealing rings 5 ​​that are sleeved on the bushing 3 and spaced apart along the axial direction.

[0029] The first radial oil hole includes a first radial hole 61, a second radial hole 62, a third radial hole 63 and a fourth radial hole 64 distributed on the oil distribution sleeve 1.

[0030] The second radial oil hole includes a fifth diameter hole 71 disposed on the first bushing 31, a sixth diameter hole 72 disposed on the second bushing 32, a seventh diameter hole 73 disposed on the third bushing 33, and an eighth diameter hole 74 disposed on the fourth bushing 34.

[0031] The axial oil holes include a first shaft hole 81, a second shaft hole 82, a third shaft hole 83, and a fourth shaft hole 84, which are disposed on the oil distribution shaft 2.

[0032] The first diameter hole 61 is connected to the first annular groove 111, the second diameter hole 62 is connected to the second annular groove 112, the third diameter hole 63 is connected to the third annular groove 113, and the fourth diameter hole 64 is connected to the fourth annular groove 114; the first shaft hole 81 is connected to the fifth diameter hole 71, the second shaft hole 82 is connected to the sixth diameter hole 72, the third shaft hole 83 is connected to the seventh diameter hole 73, and the fourth shaft hole 84 is connected to the eighth diameter hole 74.

[0033] The rotating bearing includes a first bearing 91 and a second bearing 92 located at both ends of the oil distribution sleeve 1 and the oil distribution shaft 2, respectively. The upper end of the oil distribution shaft 2 is provided with an upper gasket 300 for axially limiting the first bearing 91. At the same time, the upper gasket 300 can further enhance the sealing effect. An upper end cap 400 is also installed on the upper end of the upper gasket 300.

[0034] The lower end of the oil distribution sleeve 1 is also provided with a lower end cap 100; the inner wall of the oil distribution sleeve 1 is provided with a plurality of grooves 15 for accommodating the sealing ring 5. The lower end of the oil distribution shaft 2 is provided with a first screw hole 202, and a lower washer 600 for axially limiting the second bearing 92 is provided between the oil distribution shaft 2 and the lower end cap 100. The lower washer 600 is installed at the lower end of the oil distribution shaft 2 by a first screw 500.

[0035] During assembly, the bushing 3 is first installed inside the oil distribution sleeve 1. Then, the first bearing 91 and the second bearing 92 are installed at both ends of the oil distribution sleeve 1. The upper gasket 300 and the upper end cover 400 are installed at the upper end of the oil distribution sleeve 1, and the lower gasket 600 is installed at the lower end of the oil distribution sleeve 1. Next, the oil distribution shaft 2 is inserted from top to bottom until the lower end of the oil distribution shaft 2 abuts against the lower gasket 600. At this time, the first screw 500 passes through the lower gasket 600 and is screwed into the first screw hole 202 of the oil distribution shaft 2 to achieve locking. Finally, the lower end cover 100 is installed at the lower end of the oil distribution sleeve 1, thus completing the assembly.

[0036] In summary, this invention replaces the traditional sealing ring with a smooth ceramic coating 201 between the oil distribution shaft 2 and the bushing 3. Utilizing the high strength and heat resistance of ceramics, it effectively avoids the problems of premature aging and heat deformation affecting the sealing effect of plastic sealing rings, thus significantly improving the heat resistance and sealing performance of the structure. This makes it suitable for widespread application in various rotary joint structures. Secondly, the smooth ceramic coating 201 minimizes the resistance between the bushing 3 and the oil distribution shaft 2, greatly increasing the rotary joint's rotational speed and expanding its adaptability. Furthermore, compared to existing structures, this invention provides a fitting gap 4 between the oil distribution sleeve 1 and the bushing 3, filled with multiple sets of seals to achieve a fixed assembly between them. The seals do not contact the oil distribution shaft 2 and are not affected by high temperatures, meaning the rotary joint can withstand higher temperatures. For example, while a traditional sealing ring can withstand 200°C, the ceramic coating seal can withstand 400°C without affecting the rotary joint's rotational speed.

[0037] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A high speed rotary joint comprising: The oil distribution sleeve (1), the oil distribution shaft (2) passing through the oil distribution sleeve (1), several bushings (3) axially sleeved on the oil distribution shaft (2), and a rotating bearing disposed between the oil distribution sleeve (1) and the oil distribution shaft (2) are characterized in that, A fitting clearance (4) is provided between the oil distribution sleeve (1) and the bushing (3), and multiple sets of seals are also provided between the oil distribution sleeve (1) and the bushing (3); A number of axially spaced oil guide ring grooves (11) are provided between the bushing (3) and the oil distribution sleeve (1). The oil distribution sleeve (1) has a number of first radial oil holes that extend radially and are independently connected to each of the oil guide ring grooves (11). The bushing (3) has a number of second radial oil holes that extend radially and are independently connected to each of the oil guide ring grooves (11). The oil distribution shaft (2) has several axial oil holes that extend axially and are independently connected to each oil guide ring groove (11) at their ends. A smooth ceramic coating (201) is also provided between the oil distribution shaft (2) and the bushing (3).

2. A high-speed rotary union as defined in claim 1, wherein: The bushing (3) includes a first bushing (31), a second bushing (32), a third bushing (33) and a fourth bushing (34) arranged axially on the oil distribution shaft (2).

3. A high-speed rotary union according to claim 2, wherein: The oil guide ring groove (11) includes a first ring groove (111) disposed on the first bushing (31), a second ring groove (112) disposed on the second bushing (32), a third ring groove (113) disposed on the third bushing (33) and a fourth ring groove (114) disposed on the fourth bushing (34).

4. A high-speed rotary union as defined in claim 1, wherein: Each set of seals includes at least two sealing rings (5) that are sleeved on the bushing (3) and spaced apart along the axial direction.

5. A high-speed rotary union as defined in claim 3, wherein: The first radial oil hole includes a first radial hole (61), a second radial hole (62), a third radial hole (63) and a fourth radial hole (64) distributed on the oil distribution sleeve (1).

6. A high-speed rotary union according to claim 5, wherein: The second radial oil hole includes a fifth radial hole (71) disposed on the first bushing (31), a sixth radial hole (72) disposed on the second bushing (32), a seventh radial hole (73) disposed on the third bushing (33), and an eighth radial hole (74) disposed on the fourth bushing (34).

7. A high-speed rotary joint according to claim 6, characterized in that: The axial oil holes include a first shaft hole (81), a second shaft hole (82), a third shaft hole (83), and a fourth shaft hole (84) disposed on the oil distribution shaft (2).

8. A high-speed rotary union according to claim 7, wherein: The first diameter hole (61) is connected to the first annular groove (111), the second diameter hole (62) is connected to the second annular groove (112), the third diameter hole (63) is connected to the third annular groove (113), and the fourth diameter hole (64) is connected to the fourth annular groove (114); the first shaft hole (81) is connected to the fifth diameter hole (71), the second shaft hole (82) is connected to the sixth diameter hole (72), the third shaft hole (83) is connected to the seventh diameter hole (73), and the fourth shaft hole (84) is connected to the eighth diameter hole (74).

9. A high-speed rotary union as in claim 1, wherein: The rotating bearing includes a first bearing (91) and a second bearing (92) located at both ends of the oil distribution sleeve (1) and the oil distribution shaft (2), respectively.

10. A high-speed rotary union according to any one of claims 1-9, characterized in that: The lower end of the oil distribution sleeve (1) is further provided with a lower end cover (100); a plurality of embedding grooves (15) for accommodating sealing rings (5) are formed in the inner wall of the oil distribution sleeve (1).

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