CN114576452A - Detachable rotary joint - Google Patents

Abstract

The invention discloses a detachable rotary joint which comprises an upper shell, a lower shell, an inner pipe and a rotary pipe, wherein the upper shell and the lower shell are fixedly and hermetically connected through a flange surface and are enclosed to form a cavity, a first annular groove is formed in the lower shell, a spring and a dynamic friction sealing gasket are arranged in the first annular groove, the head end of the rotary pipe is arranged in the cavity and is rotatably connected with the lower shell, an annular boss matched with the first annular groove is arranged at the head end of the rotary pipe, the dynamic friction sealing gasket is abutted to the bottom surface of the annular boss and the side wall of the first annular groove by the spring, a pipeline interface is arranged on the upper shell, the inner pipe penetrates through the rotary pipe, and the top of the inner pipe is fixedly connected with the pipeline interface. The invention can be conveniently disassembled and removed to replace the dynamic friction sealing gasket, thereby improving the maintenance convenience.

Description

A detachable rotary joint

technical field

The invention relates to a rotary joint, in particular to a detachable rotary joint.

Background technique

Rotary joint is a kind of pipeline connection device. The pipelines connected at both ends can rotate relative to each other. It can be used to transmit various media such as gas, liquid and oil. The compact design structure adopts flanged connection, which can be effectively integrated into the customer's equipment. However, the existing rotary joints on the market have complex structures, high processing costs, and are inconvenient to disassemble. When the gaskets at the joints are worn, it is inconvenient to replace them, or medium leakage occurs, making maintenance difficult.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects of the prior art, the task of the present invention is to provide a detachable rotary joint to solve the problem that the existing rotary joint is difficult to disassemble and maintain.

The technical scheme of the present invention is as follows: a detachable rotary joint, comprising an upper casing, a lower casing, an inner pipe and a rotating pipe, the upper casing and the lower casing are fixed and sealed by flange surfaces and are enclosed to form A cavity, a first annular groove is arranged in the lower casing, a spring and a dynamic friction sealing gasket are arranged in the first annular groove, the head end of the rotating pipe is arranged in the cavity, and the rotating pipe It is rotatably connected with the lower casing, the head end of the rotating tube is provided with an annular boss that is matched with the first annular groove, and the spring abuts the dynamic friction sealing gasket against the annular boss. The bottom surface and the side wall of the first annular groove, the upper casing is provided with a pipeline interface, the inner tube is penetrated in the rotating tube, and the top of the inner tube is fixedly connected with the pipeline interface.

Further, the outer side wall of the first annular groove is higher than the inner side wall of the first annular groove.

Further, in order to reduce the friction between the upper casing and the rotating inner tube, the upper casing is provided with an annular middle wall, and the lower end face of the annular middle wall abuts the head end face of the rotating tube through the first ball.

Further, the end face of the head end of the rotating tube is provided with a second annular groove, the annular middle wall extends into the second annular groove, and the lower end surface of the annular middle wall passes through the first ball and the second annular groove. The groove bottom surfaces of the grooves are in contact with each other.

Further, in order to improve the sealing performance, an O-ring is provided between the rotating tube and the inner tube.

Further, in order to facilitate the disassembly and replacement of the O-ring, the lower end of the rotating pipe is threadedly connected to an extension pipe section, the inner diameter of the extension pipe section is the same as that of the rotating pipe, and the inner wall of the extension pipe section is the same as the inner wall of the rotating pipe. A sealing groove is provided at the butt joint of the O-ring, and the O-ring is arranged in the sealing groove.

Further, a bearing sleeve is fixed in the lower housing, the head end of the rotating tube is arranged in the bearing sleeve, and a peripheral surface of the head end of the rotating tube and the bearing sleeve is provided between the bearing sleeve. Second ball.

The advantages of the present invention compared with the prior art are:

The spring and the dynamic friction gasket are arranged on one side and placed in the first annular groove. When the dynamic friction gasket needs to be replaced and the rotating tube is taken out, the spring can push the dynamic friction gasket out of the first annular groove. Easy to replace and maintain. The high and low setting of the side wall of the first annular groove makes the dynamic friction sealing gasket not completely free from the restraint when it is ejected from the first annular groove. At the same time, the dynamic friction sealing gasket can be accurately positioned during installation to avoid the rotary tube being pressed down. When the position of the dynamic friction sealing gasket is deviated, it cannot enter the first annular groove.

Description of drawings

FIG. 1 is a schematic three-dimensional structural diagram of a detachable rotary joint of an embodiment.

FIG. 2 is a schematic cross-sectional view of the detachable rotary joint of the embodiment.

FIG. 3 is a schematic cross-sectional view of the upper casing and the lower casing of the detachable rotary joint of the embodiment.

Detailed ways

The present invention will be further described below in conjunction with the examples, but it is not intended to limit the present invention.

Embodiments, please refer to FIG. 1 to FIG. 3. A detachable rotary joint involved in this embodiment includes an upper casing 1, a lower casing 2, an inner pipe 3, a rotating pipe 4 and an extension pipe section 5. Both the shell 1 and the lower shell 2 are provided with flange surfaces 6 , and a gasket is placed between the flange surfaces 6 , and then the flange surfaces 6 are butted by bolts to fix the upper shell 1 and the lower shell 2 . A cylindrical cavity is enclosed between the upper casing 1 and the lower casing 2 . A pipeline interface 7 is provided on the upper casing 1, and the inner wall of the pipeline interface 7 is provided with threads for connection with external pipelines, and the top end of the inner pipe 3 is also connected to the pipeline interface 7 through threads.

The inner cavity of the lower shell 2 includes a cylindrical cavity, a through hole 8 is arranged in the center of the lower shell 2, a first annular groove 9 is arranged around the through hole 8 on the bottom surface of the cylindrical cavity, and the first annular groove 9 is placed inside the cavity. The bottom surface 10 of the cylindrical cavity is removed by a certain height to make it lower than the original height of the bottom surface 10 of the cylindrical cavity, thereby forming a stepped cavity with different depths in the lower casing 2 . A bearing sleeve 11 is installed in the inner cavity of the lower casing 2 , the head end of the rotating pipe 4 is arranged in the bearing sleeve 11 , and the lower end of the rotating pipe 4 passes through the through hole 8 of the lower casing 2 . A gap is formed between the outer peripheral surface of the head end of the rotating tube 4 and the inner wall of the bearing sleeve 11, and the second ball 12 is placed in the gap so that the rotating tube 4 can rotate. The spacing between the balls is equal. In order to fix the bearing sleeve 11, a flower tooth groove 13 can be provided on the inner cavity wall of the lower housing 2, and a flower tooth 15 which is matched with the flower tooth groove 13 is extended on the blocking piece 14 of the axially blocking the bearing sleeve 11, and the block The sheet 14 is fixed in the inner cavity of the lower casing 2 . The head end of the rotating tube 4 is also provided with an annular boss 16 which is matched with the first annular groove 9 . A spring 17 is arranged in the first annular groove 9, and a dynamic friction sealing washer 18 is arranged on the spring 17. When the annular boss 16 is inserted into the first annular groove 9, the spring 17 tightly abuts the dynamic friction sealing washer 18 on the annular convex The lower end surface of the table 16 . In this embodiment, the dynamic friction sealing gasket 18 is provided with a V-shaped groove with a flat bottom. When the spring 17 presses it against the lower end surface of the annular boss 16, it will also contact the side wall of the first annular groove 9 to complete the sealing. It should be noted that the top surface of the dynamic friction sealing gasket 18 can also be set as a tangential surface inclined outward or inward, so as to form better contact with the inner side wall or outer side wall of the first annular groove 9 to complete the sealing. The axial positioning of the rotating pipe 4 also depends on the upper casing 1, that is to say, when the upper casing 1 is fixed with the lower casing 2, the head end face of the rotating pipe 4 will be abutted and positioned, thus ensuring that the spring 17 Always stay under pressure. In this embodiment, an annular middle wall 19 is provided in the upper casing 1, the end face of the head end of the rotating tube 4 is provided with a second annular groove 20, and the lower end surface of the annular middle wall 19 is provided with several ball grooves. When the first ball 21 is placed, when the upper shell 1 and the lower shell 2 are butted and installed, the annular middle wall 19 extends into the second annular groove 20, the first ball 21 contacts the groove bottom of the second annular groove 20, and the inner tube 3 extends into the rotary tube 4 and protrudes from the lower end of the rotary tube 4 . In order to further improve the sealing performance, the lower end of the rotating pipe 4 is machined to form a threaded connection with the extension pipe section 5, and the extension pipe section 5 is used for connection with the external pipeline. The connected extension pipe section 5 and the rotating pipe 4 have the same inner diameter, and a quarter-circle groove is set at the butt joint between the inner wall of the extension pipe section 5 and the inner wall of the rotating pipe 4, and a semi-circular sealing groove is formed after the butt joint. 22. A semi-circular sealing groove 22 is also set at the corresponding position of the outer wall of the inner tube 3, and an O-ring 23 is set at the sealing groove 22 so that it is located between the rotating tube 4 and the inner tube 3 to form another seal point to ensure that there will be no leakage to the outside.

When the detachable rotary joint of this embodiment is disassembled and maintained, unscrew the extension pipe section 5, then remove the O-ring 23, remove the connecting bolts of the upper casing 1 and the lower casing 2, remove the baffle 14, and simultaneously remove the rotating pipe 4 and the bearing sleeve 11 are taken out from the lower casing 2, and the dynamic friction sealing gasket 18 is pushed out from the first annular groove 9 under the action of the spring 17. Since the outer wall of the first annular groove 9 is higher and the inner wall is lower, the dynamic friction After the sealing gasket 18 is pushed out, it is not easy to fly out under the constraints of the outer wall, and when a new dynamic friction sealing gasket 18 is replaced, it is also easy to keep coaxial with the first annular groove 9 without deviation. When it is butt-installed with the lower casing 2, the dynamic friction sealing gasket 18 is easier to be pressed into the first annular groove 9, which ensures the smooth progress of the installation.

Claims (7)

1. A detachable rotary joint, characterized in that it comprises an upper casing, a lower casing, an inner pipe and a rotating pipe, and the upper casing and the lower casing are fixed and sealed by flange surfaces and are enclosed to form A cavity, a first annular groove is arranged in the lower casing, a spring and a dynamic friction sealing gasket are arranged in the first annular groove, the head end of the rotating pipe is arranged in the cavity, and the rotating pipe It is rotatably connected with the lower casing, the head end of the rotating tube is provided with an annular boss that is matched with the first annular groove, and the spring abuts the dynamic friction sealing gasket against the annular boss. The bottom surface and the side wall of the first annular groove, the upper casing is provided with a pipeline interface, the inner tube is penetrated in the rotating tube, and the top of the inner tube is fixedly connected with the pipeline interface. 2 . The detachable rotary joint according to claim 1 , wherein the outer side wall of the first annular groove is higher than the inner side wall of the first annular groove. 3 . 3 . The detachable rotary joint according to claim 1 , wherein the upper casing is provided with an annular middle wall, and the lower end face of the annular middle wall passes through the first ball and the head end face of the rotating tube. 4 . Abut. 4 . The detachable rotary joint according to claim 3 , wherein the end surface of the head end of the rotary pipe is provided with a second annular groove, the annular middle wall extends into the second annular groove, and the annular The lower end surface of the middle wall is in contact with the groove bottom surface of the second annular groove through the first ball. 5 . The detachable rotary joint according to claim 1 , wherein an O-ring is provided between the rotary tube and the inner tube. 6 . 6 . The detachable rotary joint according to claim 5 , wherein the lower end of the rotating pipe is threadedly connected to the extension pipe section, the inner diameter of the extension pipe section is the same as that of the rotating pipe, and the inner wall of the extension pipe section is the same as that of the rotating pipe. 7 . A sealing groove is provided at the butt joint of the inner walls of the rotating tube, and the O-ring is arranged in the sealing groove. 7 . The detachable rotary joint according to claim 1 , wherein a bearing sleeve is fixedly arranged in the lower casing, the head end of the rotating pipe is arranged in the bearing sleeve, and the rotating pipe A second ball is arranged between the outer peripheral surface of the head end of the bearing sleeve and the bearing sleeve.

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