CN221323651U - Novel rotary sealing structure of fluid rotary joint - Google Patents

Abstract

The utility model discloses a novel rotary sealing structure of a fluid rotary joint, belonging to the field of marine engineering mooring, including: a novel rotary sealing structure of a fluid rotary joint, characterized in that it includes: an upper rotary cavity, a lower fixed cavity, a press sleeve, a press sleeve bearing, a lower fixed cavity bearing, a packing filler and a sealing ring, the lower fixed cavity is fixed to the press sleeve, the press sleeve bearing and the lower fixed cavity bearing are both arranged between the press sleeve and the upper rotary cavity, and the upper rotary cavity and the lower fixed cavity can perform relative rotational motion around the same axis. The "I"-shaped upper and lower cavity structures adopted by the utility model expand the sealing space and the range of sealing methods that can be selected, and the double sealing method with packing sealing as the main and sealing ring sealing as the auxiliary is more effective than the single sealing ring sealing.

Description

A new rotary sealing structure for fluid rotary joint

Technical Field

The utility model relates to the field of marine engineering mooring, in particular to a novel rotary sealing structure of a fluid rotary joint.

Background technique

FPSO, or floating production storage and offloading, is an important part of the marine oil and gas development system. It completes the underwater oil extraction work together with underwater oil production equipment and shuttle cruise ships. In order to improve the stability of FPSO during operation, FPSO is often used in conjunction with a single-point mooring system. The single-point mooring system is mainly composed of buoys, pile leg components, mooring cables, oil hoses and fluid rotary joints. Among them, the fluid rotary joint, as a key component of the single-point mooring system, is a conversion device that connects various fluid channels in the static part and the rotating part, and can transmit fluids, electricity and signals.

In the single point mooring system, the fluid rotary joint device passes through high temperature, high pressure and corrosive media. In addition to meeting the stability of the device during medium transmission, it should also ensure that there is no leakage due to the failure of the dynamic seal of the rotary joint. In the prior art, the sealing space of the fluid rotary joint of the single point mooring system is insufficient, and the sealing method is limited. Often, only a single sealing ring can be used for sealing. The single sealing condition greatly increases the difficulty of rotary sealing, and the problem of sealing failure is relatively serious.

Summary of the invention

The purpose of the utility model is to disclose a novel rotary sealing structure of a fluid rotary joint in view of the problems that the sealing methods of existing fluid rotary joints are limited and the sealing reliability is poor. The utility model is characterized in that it comprises: an upper rotating cavity, a lower fixed cavity, a press sleeve, a press sleeve bearing, a lower fixed cavity bearing, a packing and a sealing ring, the lower fixed cavity is fixed to the press sleeve, the press sleeve bearing and the lower fixed cavity bearing are both arranged between the press sleeve and the upper rotating cavity, and the upper rotating cavity and the lower fixed cavity can perform relative rotational motion around the same axis.

Preferably, in the above-mentioned new rotary sealing structure of the fluid rotary joint, a gap is left between the upper rotating cavity and the compression sleeve, the packing filler is arranged in the gap between the upper rotating cavity and the compression sleeve, and the sealing ring is annular in structure and is sleeved at the joint between the upper rotating cavity and the lower fixed cavity.

Preferably, in the above-mentioned novel rotary sealing structure of a fluid rotary joint, the upper rotating cavity comprises: an upper oil storage cavity and an intermediate oil pipe, the upper oil storage cavity is provided with an upper oil pipe, and the intermediate oil pipe is provided with a first annular protrusion and a second annular protrusion.

Preferably, in the above-mentioned novel rotary sealing structure of a fluid rotary joint, the outer wall of the first annular protrusion is connected to the inner ring of the press sleeve bearing, and the second annular protrusion is connected to the inner ring of the lower fixed cavity bearing.

Preferably, in the novel rotary sealing structure of the above-mentioned fluid rotary joint, the press sleeve is a thin-walled cylindrical structure with a stepped inner wall, and the press sleeve wraps the press sleeve bearing, the packing filler and the lower fixed cavity bearing.

Preferably, in the novel rotary sealing structure of the fluid rotary joint, the packing filler is an annular structure and is sleeved on the outer wall of the intermediate oil pipeline.

Preferably, in the novel rotary sealing structure of the fluid rotary joint, the lower bottom surface of the lower fixed cavity is provided with an annular groove, and the lower bottom surface of the annular groove is provided with an oil delivery hole concentric with the intermediate oil delivery pipe.

Preferably, in the novel rotary sealing structure of the above-mentioned fluid rotary joint, the lower fixed cavity is provided with a lower oil delivery pipe.

The technical effects achieved by the utility model are as follows:

1) The middle oil pipeline connects the upper oil storage chamber and the lower fixed chamber. The upper and lower chamber structures are in the shape of an "I". The high-temperature and high-pressure fluid entering the fluid rotary joint is subjected to secondary buffering, which effectively reduces the difficulty of rotary sealing and improves the working stability of the fluid rotary joint.

2) The clamping force generated by the gravity of the upper oil storage chamber and the compression sleeve compresses the soft filling material in the packing seal to cause deformation; the outer wall of the middle oil pipeline is uneven at the microscopic level, and produces a "maze effect" after fitting with the packing, thereby achieving sealing for medium throttling; in addition, multiple sealing rings are used for dynamic sealing at the joint between the middle oil pipeline and the lower fixed chamber, further improving the rotary sealing performance of the fluid rotary joint.

3) An annular groove is provided on the upper bottom surface of the lower fixed cavity to compensate for the displacement caused by the downward movement of the compression sleeve under load, and plays a role in fixing the compression sleeve. The compression sleeve has a supporting effect on the middle oil pipeline, which can significantly improve the stability of the fluid rotary joint. It improves the working conditions of the middle oil pipeline when the fluid rotary joint works in harsh sea areas and deep sea environments, where the force is complex and fatigue damage is prone to occur. It improves the stability of the system and extends the service life of the fluid rotary joint.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a fluid rotary joint;

FIG2 is a front view of the upper rotating cavity;

FIG3 is a schematic structural diagram of a compression sleeve;

FIG4 is a partial structural diagram of a fluid rotary joint;

Description of reference numerals:

1-upper rotating cavity, 11-upper oil storage cavity, 12-middle oil pipeline, 121-first annular protrusion, 122-second annular protrusion, 2-upper oil pipeline, 3-pressed sleeve bearing, 4-pressed sleeve, 41-pressed sleeve first step, 42-pressed sleeve second step, 43-pressed sleeve third step, 44-pressed sleeve fourth step, 5-packing, 6-lower fixed cavity bearing, 7-sealing ring, 8-lower fixed cavity, 81-annular groove, 9-lower oil pipeline.

Detailed ways

The utility model is described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1, 2, 3 and 4, the rotary sealing structure of the fluid rotary joint of the utility model comprises: an upper rotating cavity 1, a lower fixed cavity 8, a pressing sleeve 4, a pressing sleeve bearing 3, a lower fixed cavity bearing 6, a packing 5 and a sealing ring 7, the lower fixed cavity 8 is fixed to the pressing sleeve 4, the pressing sleeve bearing 3 and the lower fixed cavity bearing 6 are both arranged between the pressing sleeve 4 and the upper rotating cavity 1, the upper rotating cavity 1 and the lower fixed cavity 8 can make relative rotational motion around the same axis, a gap is left between the upper rotating cavity 1 and the pressing sleeve 4, the packing 5 is arranged in the gap between the upper rotating cavity 1 and the pressing sleeve 4, and the sealing ring 7 is an annular structure and is sleeved at the joint between the upper rotating cavity 1 and the lower fixed cavity 8;

The upper rotating chamber 1 includes: an upper oil storage chamber 11 and an intermediate oil delivery pipe 12. The upper rotating chamber 1 is in a "T"-shaped structure. The upper oil storage chamber 11 is connected to the intermediate oil delivery pipe 12 and the upper oil delivery pipe 2. The "T"-shaped structure of the upper rotating chamber 1 can play an oil storage and buffering role when the fluid medium flows from the intermediate oil delivery pipe 12 through the upper oil storage chamber 11.

The intermediate oil delivery pipe 12 is in an "I"-shaped structure, and is provided with a first annular protrusion 121 and a second annular protrusion 122. The outer wall of the first annular protrusion 121 cooperates with the inner ring of the press sleeve bearing 3, and the outer wall of the second annular protrusion 122 cooperates with the inner ring of the lower fixed cavity bearing 6.

The lower fixed cavity 8 is a cylindrical cavity structure with the same diameter as the upper oil storage cavity 11. The fluid medium flows from the lower oil delivery pipe 9 through the lower fixed cavity 8 into the intermediate oil delivery pipeline 12. The lower fixed cavity 8 plays the role of oil storage and buffering.

The upper bottom surface of the lower fixed cavity 8 is provided with an annular groove 81, and the lower bottom surface of the annular groove 81 is provided with an oil hole. The annular groove 81 can compensate for the displacement generated when the pressing sleeve moves downward under the load, and plays a role in fixing the pressing sleeve 4;

The sealing ring 7 is arranged at the joint between the intermediate oil pipe 12 and the oil through hole on the upper bottom surface of the lower fixed cavity 8. The use of three sealing rings for dynamic sealing can prevent fluid leakage when the fluid flows through the lower fixed cavity 8 through the intermediate oil pipe 12;

The inner wall of the press sleeve 4 is a stepped thin-walled cylindrical structure, wherein the inner wall of the first step 41 of the press sleeve is connected to the outer ring of the press sleeve bearing 3, the inner wall of the second step 42 of the press sleeve and the outer wall of the intermediate oil pipeline 12 are clearance-matched, a packing filler 5 is provided in the gap between the inner wall of the third step 43 of the press sleeve and the outer wall of the intermediate oil pipeline 12, the inner wall of the fourth step 44 of the press sleeve is connected to the outer ring of the lower fixed cavity bearing 6, and the outer wall of the fourth step 44 of the press sleeve and the inner wall of the annular groove 81 are interference-fitted, so that in the process of the fluid medium being input from the lower oil pipeline 9 and output from the upper oil pipeline 2, it can be ensured that the upper rotating cavity 1 relative to the lower fixed cavity 8 performs relative rotational motion around the same axis;

The materials used for the packing 5 include: high-quality asbestos and/or high-quality graphene. The packing 5 is sleeved in the gap between the outer wall of the intermediate oil pipeline 12 and the pressing sleeve 4. The outer wall of the intermediate oil pipeline 12 is uneven at the microscopic level. The pressing sleeve 4 bears the gravity of the upper oil storage chamber 11, and produces a "maze effect" after being fitted with the packing 5, which can further prevent the fluid from leaking further due to the failure of the sealing ring 7.

The utility model and its implementation methods are described above, and the implementation methods without limitation are not limited to this description. In short, if ordinary technicians in this field are inspired by it and design structural methods and implementation cases similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims (6)

1. A novel rotary seal structure for a fluid rotary joint, characterized in that it comprises: an upper rotary cavity (1), a lower fixed cavity (8), a press sleeve (4), a press sleeve bearing (3), a lower fixed cavity bearing (6), a packing (5) and a sealing ring (7), wherein the upper rotary cavity (1) comprises: an upper oil storage cavity (11) and an intermediate oil delivery pipe (12), wherein the upper oil storage cavity (11) is provided with an upper oil delivery pipe (2), wherein the intermediate oil delivery pipe (12) is provided with a first annular protrusion (121) and a second annular protrusion (122), wherein the upper rotary cavity (1) and the press sleeve bearing (3) are connected to each other. A gap is left between the sleeves (4); the packing filler (5) is arranged in the gap between the upper rotating cavity (1) and the pressing sleeve (4); the sealing ring (7) is annular and is sleeved at the joint between the upper rotating cavity (1) and the lower fixed cavity (8); the lower fixed cavity (8) is fixed to the pressing sleeve (4); the pressing sleeve bearing (3) and the lower fixed cavity bearing (6) are both arranged between the pressing sleeve (4) and the upper rotating cavity (1); and the upper rotating cavity (1) and the lower fixed cavity (8) can perform relative rotational motion around the same axis. 2. The new rotary sealing structure of the fluid rotary joint as described in claim 1 is characterized in that the outer wall of the first annular protrusion (121) is connected to the inner ring of the press sleeve bearing (3), and the second annular protrusion (122) is connected to the inner ring of the lower fixed cavity bearing (6). 3. The new rotary sealing structure of the fluid rotary joint as described in claim 1 is characterized in that the press sleeve (4) is a thin-walled cylindrical structure with a stepped inner wall, and the press sleeve (4) wraps the press sleeve bearing (3), the packing filler (5) and the lower fixed cavity bearing (6). 4. The novel rotary sealing structure of the fluid rotary joint as claimed in claim 1 is characterized in that the packing (5) is an annular structure and is sleeved on the outer wall of the intermediate oil pipeline (12). 5. The novel rotary sealing structure of the fluid rotary joint as described in claim 1 is characterized in that an annular groove (81) is provided on the lower bottom surface of the lower fixed cavity (8), and an oil hole concentric with the intermediate oil pipe (12) is provided on the lower bottom surface of the annular groove (81). 6. The novel rotary sealing structure of the fluid rotary joint as claimed in claim 1, characterized in that the lower fixed cavity (8) is provided with a lower oil delivery pipe (9).