CN219242703U

CN219242703U - Hydraulic rotary joint

Info

Publication number: CN219242703U
Application number: CN202223585499.6U
Authority: CN
Inventors: 王俊
Original assignee: Ruigujie Industrial Technology Changzhou Co ltd
Current assignee: Ruigujie Industrial Technology Changzhou Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-06-23
Anticipated expiration: 2032-12-31

Abstract

The utility model discloses a hydraulic rotary joint, which comprises a valve core and an outer shell body coaxially and rotatably sealed outside the valve core, wherein the valve core comprises a plurality of groups of oil passage channels, an oil liquid annular cavity is arranged on the inner side of the outer shell body corresponding to the oil passage channels in a ring mode, high-pressure sealing rings are respectively arranged between the valve core and the outer shell body and correspond to the two axial sides of the oil liquid annular cavity, at least two groups of low-pressure sealing rings are also arranged between the valve core and the outer shell body, and a plurality of high-pressure sealing rings are axially arranged between the two groups of low-pressure sealing rings. The hydraulic rotary joint can be suitable for running under high pressure and can also be operated under low pressure.

Description

Hydraulic rotary joint

Technical Field

The utility model belongs to the field of hydraulic rotary joints, and particularly relates to a hydraulic rotary joint.

Background

In the field of hydraulic reels, the internal pressure of the hydraulic reel is constantly changing with the state of use. The frequency of the mutual conversion between the high pressure (more than 20 mpa) and the low pressure (less than 5 mpa) is high. This makes high pressure and low pressure tightness requirements for the rotary joint high. At present, most sealing rings between an outer shell and a valve core of a hydraulic rotary joint are of the same type, and high-pressure sealing rings are adopted for sealing, but under the use occasions of high-pressure and low-pressure high-frequency conversion, the hydraulic rotary joint has a certain degree of penetration phenomenon at low pressure, so that the hydraulic rotary joint structure capable of adapting to the high-pressure and low-pressure frequent conversion is needed.

Disclosure of Invention

The utility model aims to: in order to overcome the defects in the prior art, the utility model provides a hydraulic rotary joint which can be suitable for use occasions of frequent high and low pressure conversion.

The technical scheme is as follows: in order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides a hydraulic swivel joint, includes case and coaxial gyration seal setting at the shell body in the case outside, including a plurality of groups oil circuit passageway on the case, the inboard of shell body is equipped with the oil liquid ring chamber corresponding to the oil circuit passageway ring, be provided with the high-pressure seal ring respectively corresponding to the axial both sides in oil liquid ring chamber between case and the shell body, still be provided with two at least low-pressure seal rings of group between case and the shell body, a plurality of high-pressure seal rings are located between two low-pressure seal rings of group in the axial.

Further, the high-pressure sealing ring is a gray sealing ring.

Further, the low-pressure sealing ring is a star-shaped sealing ring.

Further, the low-pressure sealing ring is arranged at the outermost high-pressure sealing ring at an axial distance, and an oil seepage gap section is formed between the low-pressure sealing ring and the high-pressure sealing ring.

Further, the high-pressure sealing ring comprises three groups of high-pressure sealing rings, and two oil liquid annular cavities are respectively positioned between the three groups of high-pressure sealing rings.

Further, a bearing is arranged between the outer shell and the valve core and positioned on the outer sides of the two groups of low-pressure sealing rings in the axial direction.

Further, a sealing groove for installing a high-pressure sealing ring and a low-pressure sealing ring is formed in the inner cavity wall of the outer shell.

The beneficial effects are that: according to the utility model, the outer shell and the valve core are sealed through the high-pressure sealing ring and the low-pressure sealing ring, the high-pressure sealing ring plays a main sealing role in high pressure, and the low-pressure sealing ring on the outer side performs low-pressure anti-seepage protection on the high-pressure sealing ring in low pressure, so that the hydraulic rotary joint can not only be suitable for running under high pressure, but also can meet the running under low pressure.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

fig. 2 is an axial schematic view of the overall structure of the present utility model.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, a hydraulic rotary joint comprises a valve core 1 and an outer shell 2 coaxially and rotatably sealed outside the valve core, wherein the valve core 1 comprises a plurality of groups of oil channel channels 3, an oil liquid annular cavity 4 is annularly arranged on the inner side of the outer shell 2 corresponding to the oil channel channels 3, an oil liquid outlet hole is formed on the outer shell corresponding to the oil liquid annular cavity, and the valve core and the outer shell are sealed through a high-pressure sealing ring and a low-pressure sealing ring. High-pressure sealing rings 5 are respectively arranged between the valve core 1 and the outer shell 2 and correspond to the two axial sides of the oil liquid annular cavity 4, at least two groups of low-pressure sealing rings 6 are also arranged between the valve core 1 and the outer shell 2, and a plurality of high-pressure sealing rings 5 are axially arranged between the two groups of low-pressure sealing rings 6. The high-pressure sealing ring 5 is a gray sealing ring, and the low-pressure sealing ring 6 is a star sealing ring. The outer shell and the valve core are sealed through the high-pressure sealing ring 5 and the low-pressure sealing ring 6, the gray sealing ring plays a main sealing role as the high-pressure sealing ring in high pressure, the higher the internal pressure is, the better the sealing role is, the low-pressure sealing ring on the outer side performs low-pressure anti-seepage protection on the high-pressure sealing ring in low pressure, the star sealing ring on the outer side has the main sealing role, hydraulic oil is prevented from seeping out from the gray sealing ring under low pressure, the hydraulic rotary joint can not only be suitable for high-pressure operation, but also can meet the low-pressure operation.

The low-pressure sealing ring 6 is arranged at the outermost high-pressure sealing ring 5 at an axial distance, an oil seepage gap section is formed between the low-pressure sealing ring 6 and the high-pressure sealing ring 5, and even if the high-pressure sealing ring leaks in a low-pressure use environment, the low-pressure sealing ring 6 on the outer side is used for sealing, oil liquid permeated into the oil seepage gap section forms an oil seal, and the seepage-proof capacity is further improved.

The high-pressure sealing ring comprises three groups of high-pressure sealing rings 5, wherein the high-pressure sealing rings are sealed into a first high-pressure sealing ring 5a, a second high-pressure sealing ring 5b and a high-pressure sealing ring 5c, and two oil liquid annular cavities 4 are respectively positioned between the three groups of high-pressure sealing rings 5 and are sealed together to prevent leakage. The low-pressure seal ring 6 includes a low-pressure seal ring one 6a and a low-pressure seal ring 6b.

A bearing 7 is arranged between the outer housing 2 and the valve core 1 and positioned at the outer sides of the two groups of low-pressure sealing rings 6 in the axial direction, and the bearing 7 is a ball bearing and comprises a first bearing 7a and a second bearing 7b. The valve core 1 is of a T-shaped structure, the outer shell body is rotatably arranged on the small-diameter shaft, and a shaft check ring 8 is arranged on one side, far away from the large-diameter shaft, of the small-diameter shaft of the valve core, so that the outer shell body is fixed relative to the valve core in the axial direction.

The inner cavity wall of the outer shell 2 is provided with a sealing groove for installing a high-pressure sealing ring and a low-pressure sealing ring.

The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.

Claims

1. A hydraulic swivel joint, characterized in that: including case (1) and coaxial gyration seal setting in the shell body (2) in the case outside, be contained a plurality of groups oil circuit passageway (3) on case (1), the inboard of shell body (2) is equipped with oil liquid ring chamber (4) corresponding to oil circuit passageway (3) ring, be provided with high-pressure seal ring (5) respectively corresponding to the axial both sides of oil liquid ring chamber (4) between case (1) and the shell body (2), still be provided with two at least low-pressure seal ring (6) of group between case (1) and the shell body (2), a plurality of high-pressure seal rings (5) are located between two sets of low-pressure seal rings (6) in the axial.

2. A hydraulic swivel according to claim 1, wherein: the high-pressure sealing ring (5) is a Gelai sealing ring.

3. A hydraulic swivel according to claim 1, wherein: the low-pressure sealing ring (6) is a star-shaped sealing ring.

4. A hydraulic swivel according to claim 1, wherein: the low-pressure sealing ring (6) is arranged at a distance from the outermost high-pressure sealing ring (5) in the axial direction, and an oil seepage gap section is formed between the low-pressure sealing ring (6) and the high-pressure sealing ring (5).

5. A hydraulic swivel according to claim 1, wherein: the high-pressure sealing ring comprises three groups of high-pressure sealing rings (5), and two oil liquid annular cavities are respectively positioned between the three groups of high-pressure sealing rings (5).

6. A hydraulic swivel according to claim 1, wherein: and bearings (7) are arranged between the outer shell (2) and the valve core (1) and positioned on the outer sides of the two groups of low-pressure sealing rings (6) in the axial direction.

7. A hydraulic swivel according to claim 1, wherein: the inner cavity wall of the outer shell (2) is provided with a sealing groove for installing a high-pressure sealing ring and a low-pressure sealing ring.