CN201575250U - New Rotary Joint with Flexible Floating Ring Sealing Structure - Google Patents

Abstract

The utility model relates to a rotary joint with a flexible floating ring sealing structure. The rotating shaft is freely rotatably installed in a housing through a bearing. A floating ring is arranged between the rotating shaft and the housing. The outer surface of the floating ring and the inner wall of the housing pass through O The inner wall of the floating ring is matched with the rotating shaft; the inner wall of the housing is provided with a ring groove opposite to the middle of the outer surface of the floating ring along the circumference, and there is a ring groove communicating with the ring groove in the radial direction on the housing. Oil port, the middle part of the inner wall of the floating ring is provided with a groove along the circumferential direction, a through hole communicating with the groove of the inner wall is opened radially on the floating ring, and a through hole communicating with the groove of the inner wall of the floating ring is opened radially on the rotating shaft Radial hole, the rotating shaft has an axial hole connected with the radial hole in the axial direction, and the oil port on the housing forms a passage through the through hole on the floating ring and the radial hole and axial hole on the rotating shaft . A flexible floating ring is arranged between the rotating shaft and the housing to ensure the axial sealing gap of the rotating shaft and avoid direct friction between the rotating shaft and the inner wall of the floating ring.

Description

New Rotary Joint with Flexible Floating Ring Sealing Structure

technical field

The utility model relates to a new type of rotary joint, in particular to a device for connecting the pressurized fluid medium in the pressure pipe to the pressure system of the rotating mechanical equipment, which is used for continuously conveying the fluid with a certain pressure flowing in the static pipe without leakage The power transmission is realized in the rotating parts, which belongs to the technical field of rotating machinery equipment.

Background technique

Swivel joints are widely used in the occasions of transporting liquid media to various rotating machinery and equipment. The fluid with a certain pressure flowing in the static pipeline can be continuously and seamlessly transported to the rotating parts to realize power transmission.

The currently used rotary joint is a rotary joint with an axial sealing structure, which has problems such as complex structure, high manufacturing precision requirements, short service life, large leakage, and easy jamming between the rotating shaft and the outer shell, resulting in a large maintenance workload , The adverse consequences of large dielectric loss and environmental pollution can affect the production efficiency of production equipment in severe cases.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a new type of rotary joint suitable for high-speed occasions with long life, low leakage and no jamming.

The purpose of this utility model is achieved through the following technical solutions:

A new type of rotary joint with a flexible floating ring seal structure, including a rotating shaft, a housing, a pair of flexible floating rings, an O-ring and a bearing. The rotating shaft is freely rotatably installed in the housing through the bearings. Both the left end joint and the right end joint are provided with a sealing device. The feature is that a floating ring is arranged between the rotating shaft and the housing, and the outer surface of the floating ring is in conflict with the inner wall of the housing through an O-ring. The inner wall of the housing is matched with the rotating shaft; the inner wall of the housing is provided with an annular groove opposite to the middle of the outer surface of the floating ring along the circumference, and an oil port communicating with the annular groove is opened radially on the housing. The middle part of the inner wall of the floating ring is provided with a groove along the circumferential direction, and a through hole communicating with the groove of the inner wall is opened radially on the floating ring, and a through hole communicating with the groove of the inner wall of the floating ring is opened radially on the rotating shaft. Radial hole, the rotating shaft has an axial hole connected with the radial hole in the axial direction, so that the oil port on the housing passes through the through hole on the floating ring and the radial hole and axial hole on the rotating shaft Form a pathway.

Further, in the aforementioned novel rotary joint with a flexible floating ring sealing structure, two floating rings are arranged between the rotating shaft and the housing, and the outer surface of each floating ring is in conflict with the inner wall of the housing, and each The inner wall of the floating ring is matched with the rotating shaft; the inner wall of the housing is provided with a ring groove opposite to the middle of the outer surface of each floating ring along the circumference, and a ring groove corresponding to each ring groove is opened in the radial direction on the housing. The middle part of the inner wall of each floating ring is provided with a groove along the circumferential direction, and a through hole communicating with the inner wall groove is opened radially on each floating ring, and the rotating shaft is opened radially. A radial hole communicates with the groove on the inner wall of each floating ring, and a steering hole communicated with each radial hole is formed on the rotating shaft in the axial direction.

Furthermore, in the aforementioned novel rotary joint with a flexible floating ring sealing structure, an O-ring is provided between the outer surface of the floating ring and the inner wall of the casing.

The substantive features and progress of the technical solution of the utility model are mainly reflected in:

①The utility model guarantees the sealing gap in the axial direction of the rotating shaft by setting a flexible floating ring between the rotating shaft and the housing, which not only avoids the direct friction between the rotating shaft and the inner wall of the floating ring, but also plays a sealing role, so that the new rotary joint Has a long service life;

②The floating ring is between the rotating shaft and the fixed housing. When the pressure oil enters the channel formed by the fixed housing and the floating ring through the joint, there will be a certain side thrust on the O-rings on both sides of the outer surface of the floating ring. Make the O-shaped sealing ring produce a certain axial flattening deformation, so as to adjust the floating ring, eliminate the influence of gravity of the floating ring, have a flexible self-aligning function, and ensure the gap between the inner wall of the floating ring and the rotating shaft;

③The new rotary joint is easy to manufacture, suitable for high-speed applications, and has significant advantages such as long life, low leakage, and no jamming.

Description of drawings

Below in conjunction with accompanying drawing, technical scheme of the utility model is further described:

Fig. 1: Schematic diagram of the structure of the utility model.

See the table below for the meanings of the symbols in the figure:

Reference signs meaning Reference signs meaning Reference signs meaning 1 Axis of rotation 2 Gland 3 lip seal 4 Transparent cover 5 sealing board 6 Bearing 7 shell 8 floating ring 9 O-ring 10 Bearing 11 sealing board 12 stuffy cover 13 shaft end retaining ring

Detailed ways

As shown in Figure 1, a new rotary joint with a flexible floating ring seal structure includes a rotating shaft 1, a housing 7, a bearing 6, a bearing 10 and a pair of flexible floating rings 8, and the rotating shaft 1 passes through the right end bearing 6 and the left end bearing 10 It is rotatably installed in the housing 7, and a floating ring 8 is arranged between the rotating shaft 1 and the housing 7. The outer surface of the floating ring 8 is in conflict with the inner wall of the housing 7, and the outer surface of the floating ring is in contact with the housing. An O-ring 9 is arranged between the inner walls of the floating ring, and the inner wall of the floating ring 8 is matched with the rotating shaft 1; the inner wall of the housing 7 is provided with a ring groove opposite to the middle of the outer surface of the floating ring along the circumferential direction, and in the housing 7 There is an oil port communicating with the ring groove in the radial direction, a groove is arranged in the middle of the inner wall of the floating ring along the circumferential direction, and a through hole communicating with the groove of the inner wall is opened in the radial direction on the floating ring. There is a radial hole communicating with the groove of the inner wall of the floating ring in the radial direction, and an axial hole communicating with the radial hole is opened on the rotating shaft in the axial direction, so that the oil port on the housing passes through the passage on the floating ring. The hole forms a passage with the radial hole and the axial hole on the rotating shaft.

Usually, two floating rings are arranged between the rotating shaft 1 and the housing 7, the outer surface of each floating ring is in conflict with the inner wall of the housing, and the inner wall of each floating ring is matched with the rotating shaft; The inner wall is provided with a ring groove opposite to the middle of the outer surface of each floating ring along the circumference, and oil ports (oil port C, oil port D) communicating with each ring groove are opened radially on the shell. The middle part of the inner wall of the floating ring is provided with grooves in the circumferential direction, and each floating ring is provided with a through hole radially connected with the inner wall groove, and the rotating shaft is radially opened with a groove connected with the inner wall groove of each floating ring. There are radial holes, and an axial hole communicating with each radial hole is opened in the axial direction on the rotating shaft.

A sealing device is provided at the joint between the rotating shaft and the left end of the housing. The left end of the rotating shaft 1 is provided with a shaft end retaining ring 13. The stuffy cover 12 is in contact with the left end bearing 10. The stuffy cover 12 is fixed on the housing 7 by bolts. There is a sealing plate 11 between the cover 12 and the housing 7 . A sealing device is provided at the junction of the rotating shaft and the right end of the casing, the transparent cover 4 is in contact with the right end bearing 6, the transparent cover 4 is fixed on the casing 7 by bolts, and there is a sealing plate 5 between the transparent cover 4 and the casing 7. A lip seal 3 is provided between the transparent cover 4 and the rotating shaft 1 , and the gland 2 is connected to the transparent cover 4 . Oil drain port A and oil drain port B are provided on the housing 7, the oil drain port A communicates with the lubricating oil channel of the left end bearing 10, and the oil drain port B communicates with the lubricating oil channel of the right end bearing 6.

The structure adopts the principle of mechanical gap seal design, the rotating shaft 1 is connected with the rotating shaft on the rotating machine, and is driven by the rotating machine to rotate. The housing 7 is the general assembly basis of the rotary joint, and the housing 7 is supported on the rotating shaft 1 by two bearings (the right end bearing 6 and the left end bearing 10). The rotating shaft 1 rotates with the rotating machine under the support of the bearing, and other parts are stationary. A flexible floating ring 8 is provided between the rotating shaft 1 and the housing 7 to ensure the axial sealing gap of the rotating shaft, thereby sealing the fluid being transmitted. The rotating shaft 1 rotates with the rotating machine under the support of the bearing, and other parts are stationary. The floating ring 8 is located between the rotating shaft 1 and the fixed housing 7. The inner wall of the floating ring and the rotating shaft are sealed by a small gap. The outer surface of the floating ring is in contact with the housing through the O-ring 9, and the pressure oil enters the housing through the joint. When the passage formed with the floating ring, there is a certain side thrust on the O-ring on both sides of the outer surface of the floating ring, and the side thrust makes the O-ring 9 produce a certain axial crushing deformation, so that the floating ring can be adjusted. Eliminate the influence of the gravity of the floating ring, and have a flexible centering function, which ensures the gap between the inner wall of the floating ring and the rotating shaft, so that the rotating shaft is not in contact with the floating ring, but also plays a sealing role. The fluid medium with a certain pressure is driven by the oil Ports (oil port C, oil port D) are delivered to the medium passage of the rotating shaft through the housing and floating ring to complete the continuous and leak-free delivery of fluid.

The setting of the floating ring ensures the uniformity of the small gap between the rotating shaft and the inner wall of the floating ring, which not only avoids direct friction between the rotating shaft and the inner wall of the floating ring, but also plays a sealing role, so that the new rotary joint has a longer service life. The rotating shaft and the floating ring respectively use two materials with different hardness for the combination of friction pairs, which improves the wear resistance and prolongs the service life of the rotary joint.

To sum up, the utility model ensures the axial sealing gap of the rotating shaft by setting a flexible floating ring with an aligning function between the rotating shaft and the fixed housing, which avoids the direct friction between the rotating shaft and the inner wall of the floating ring , and play the role of sealing, which overcomes the defects of the existing rotary joint that the rotating shaft and the shell are prone to jamming. The new rotary joint is easy to manufacture, suitable for high-speed applications, and has significant advantages such as long life and low leakage.

It should be understood that: the above is only a preferred embodiment of the utility model, for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (3)

1. A new type of rotary joint with a flexible floating ring seal structure, including a rotating shaft, a housing, a floating ring, an O-ring and a bearing. The rotating shaft is freely rotatably installed in the housing through the bearing. The left end of the rotating shaft and the housing Both the joint and the joint at the right end are equipped with a sealing device, which is characterized in that: a floating ring is arranged between the rotating shaft and the housing, the outer surface of the floating ring is in conflict with the inner wall of the housing through an O-ring, and the floating ring The inner wall of the housing is matched with the rotating shaft; the inner wall of the housing is provided with an annular groove opposite to the middle of the outer surface of the floating ring along the circumference, and an oil port communicating with the annular groove is opened radially on the housing. The middle part of the inner wall of the floating ring is provided with a groove along the circumferential direction, and a through hole communicating with the groove of the inner wall is opened radially on the floating ring, and a through hole communicating with the groove of the inner wall of the floating ring is opened radially on the rotating shaft. Radial hole, the rotating shaft has an axial hole connected with the radial hole in the axial direction, so that the oil port on the housing passes through the through hole on the floating ring and the radial hole and axial hole on the rotating shaft Form a pathway. 2. The novel rotary joint with a flexible floating ring sealing structure according to claim 1, characterized in that: two floating rings are arranged between the rotating shaft and the casing, and the outer surface of each floating ring is in contact with the casing The inner wall of the body is in conflict with the O-shaped sealing ring, and the inner wall of each floating ring is matched with the rotating shaft; the inner wall of the housing is provided with a ring groove opposite to the middle of the outer surface of each floating ring along the circumferential direction. There is an oil port communicating with each ring groove in the radial direction on the shell, a groove is provided in the middle of the inner wall of each floating ring along the circumferential direction, and a port communicating with the inner wall groove is opened radially on each floating ring. Through holes, radial holes communicating with the inner wall grooves of each floating ring are opened on the rotating shaft in the radial direction, and axial holes communicating with each radial hole are opened on the rotating shaft in the axial direction. 3. The novel rotary joint with a flexible floating ring sealing structure according to claim 1, wherein an O-ring is provided between the outer surface of the floating ring and the inner wall of the casing.

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