CN114576452B - 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, the rotary pipe is rotationally connected with the lower shell, the head end of the rotary pipe is provided with an annular boss matched with the first annular groove, the spring abuts the dynamic friction sealing gasket on the bottom surface of the annular boss and the side wall of the first annular groove, a pipeline interface is arranged on the upper shell, the inner pipe is arranged in the rotary pipe in a penetrating mode, 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 rotating joint

Technical Field

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

Background Art

The rotary joint is a pipe connection device, the two connected pipes can rotate relative to each other, and can be used to transmit gas, liquid, oil and other media. The compact design structure adopts flange connection and can be effectively integrated into the customer's equipment. However, the existing rotary joints on the market have a complex structure, high processing cost, and are not convenient to disassemble. When the gasket at the connection is worn, it is inconvenient to replace it, or when the medium leaks, it is difficult to repair.

Summary of the invention

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

The technical solution of the present invention is as follows: a detachable rotary joint, comprising an upper shell, a lower shell, an inner tube and a rotating tube, the upper shell and the lower shell are fixedly sealed and connected by a flange surface and enclosed to form a cavity, a first annular groove is provided in the lower shell, a spring and a dynamic friction sealing gasket are provided in the first annular groove, the head end of the rotating tube is arranged in the cavity, the rotating tube is rotatably connected to the lower shell, the head end of the rotating tube is provided with an annular boss matching the first annular groove, the spring causes the dynamic friction sealing gasket to abut the bottom surface of the annular boss and the side wall of the first annular groove, the upper shell is provided with a pipeline interface, the inner tube is inserted into the rotating tube, and the top of the inner tube is fixedly connected to the pipeline interface.

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

Furthermore, in order to reduce the friction between the upper shell and the rotating inner tube, an annular middle wall is provided in the upper shell, and the lower end surface of the annular middle wall abuts against the head end surface of the rotating tube through a first ball.

Furthermore, a second annular groove is provided on the end surface of the head end of the rotating tube, the annular middle wall extends into the second annular groove, and the lower end surface of the annular middle wall abuts against the bottom surface of the second annular groove through the first ball.

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

Furthermore, in order to facilitate the removal and replacement of the O-ring, the lower end of the rotating tube is threadedly connected to an extension pipe section, the extension pipe section has the same inner diameter as the rotating tube, and a sealing groove is provided at the joint between the inner wall of the extension pipe section and the inner wall of the rotating tube, and the O-ring is arranged in the sealing groove.

Furthermore, a bearing sleeve is fixedly provided in the lower shell body, the head end of the rotating tube is arranged in the bearing sleeve, and a second ball is provided between the outer peripheral surface of the head end of the rotating tube and the bearing sleeve.

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

The spring and the dynamic friction sealing gasket are arranged on one side and placed in the first annular groove. When the dynamic friction sealing gasket needs to be replaced and the rotating tube is taken out, the spring can push the dynamic friction sealing gasket out of the first annular groove, which is convenient for replacement and maintenance. The height setting of the side wall of the first annular groove ensures that the dynamic friction sealing gasket will not be completely free from the restraint when it is pushed out of the first annular groove. At the same time, the dynamic friction sealing gasket can be accurately positioned during installation to avoid the deviation of the position of the dynamic friction sealing gasket when the rotating tube is pressed down and fail to enter the first annular groove.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the three-dimensional structure of a detachable rotary joint according to an embodiment.

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

FIG3 is a schematic cross-sectional view of an upper shell and a lower shell of a detachable rotary joint according to an embodiment.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the embodiments, but are not intended to be limiting of the present invention.

Embodiment, please refer to Figures 1 to 3, a detachable rotary joint involved in this embodiment includes an upper shell 1, a lower shell 2, an inner tube 3, a rotary tube 4 and an extended pipe section 5, and the upper shell 1 and the lower shell 2 are both provided with flange surfaces 6, and a sealing gasket is placed between the flange surfaces 6, and then the flange surfaces 6 are connected by bolts to fix the upper shell 1 and the lower shell 2. A cylindrical cavity is enclosed between the upper shell 1 and the lower shell 2. A pipeline interface 7 is provided on the upper shell 1, and the inner wall of the pipeline interface 7 is provided with a thread for connecting with an external pipeline, and the top end of the inner tube 3 is also connected to the pipeline interface 7 through a thread.

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 a certain height is removed from the bottom surface 10 of the cylindrical cavity in the first annular groove 9 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 shell 2. A bearing sleeve 11 is installed in the inner cavity of the lower shell 2, the head end of the rotating tube 4 is arranged in the bearing sleeve 11, and the lower end of the rotating tube 4 passes through the through hole 8 of the lower shell 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 a second ball 12 is placed in the gap so that the rotating tube 4 can rotate. The second balls 12 are arranged between the bearing ball buckles to ensure that the spacing between the balls is equal. In order to fix the bearing sleeve 11, a tooth groove 13 can be provided on the inner wall of the lower housing 2, and a tooth 15 matching the tooth groove 13 is provided on the outer side of the baffle 14 that blocks the bearing sleeve 11 in the axial direction, so that the baffle 14 is fixed in the inner cavity of the lower housing 2. The head end of the rotating tube 4 is also provided with an annular boss 16 matching the first annular groove 9. When the rotating tube 4 is installed and matched with the bearing sleeve 11, the annular boss 16 is inserted into the first annular groove 9. A spring 17 is provided in the first annular groove 9, and a dynamic friction sealing gasket 18 is provided 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 gasket 18 against the lower end surface of the annular boss 16. In this embodiment, the dynamic friction sealing gasket 18 is provided with a flat bottom V-shaped groove. 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 pointed out that the top surface of the dynamic friction sealing gasket 18 can also be set as an outward or inward inclined section, so as to form a better contact with the inner side wall or outer side wall of the first annular groove 9 to complete the seal. The axial positioning of the rotating tube 4 also depends on the upper shell 1, that is, when the upper shell 1 is fixed with the lower shell 2, it will abut and position the end face of the head end of the rotating tube 4, so as to ensure that the spring 17 is always kept under pressure. In this embodiment, an annular middle wall 19 is provided in the upper shell 1, and a second annular groove 20 is provided on the end face of the head end of the rotating tube 4. A plurality of ball grooves are provided on the lower end face of the annular middle wall 19, and a first ball 21 is placed in the ball groove. When the upper shell 1 and the lower shell 2 are docked and installed, the annular middle wall 19 extends into the second annular groove 20, and the first ball 21 contacts the bottom of the second annular groove 20, and the inner tube 3 extends into the rotating tube 4 and extends from the lower end of the rotating tube 4. In order to further improve the sealing performance, the lower end of the rotating tube 4 is threaded to form a threaded connection with the extension pipe section 5, and the extension pipe section 5 is used to connect with the external pipeline. The connected extension pipe section 5 has the same inner diameter as the rotating tube 4, and a quarter-circular groove is provided at the joint of the inner wall of the extension pipe section 5 and the inner wall of the rotating tube 4, and a semicircular sealing groove 22 is formed after the joint, and a semicircular sealing groove 22 is also provided at the corresponding position of the outer wall of the inner tube 3, and an O-type sealing ring 23 is provided at the sealing groove 22 so that it is located between the rotating tube 4 and the inner tube 3 to form another sealing point to ensure that there is no leakage to the outside.

When the detachable rotary joint of the present embodiment is disassembled and maintained, the extension pipe section 5 is unscrewed, and then the O-ring 23 is removed, the connecting bolts of the upper shell 1 and the lower shell 2 are removed, and the baffle 14 is removed, and the rotating tube 4 and the bearing sleeve 11 are taken out from the lower shell 2 at the same time, and the dynamic friction sealing gasket 18 is ejected 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 sealing gasket 18 is not easy to fly out after being ejected because it is constrained by the outer wall. When replacing a new dynamic friction sealing gasket 18, it is also easy to keep coaxial with the first annular groove 9 without deviation. When the upper shell 1 and the lower shell 2 are docked and installed, the dynamic friction sealing gasket 18 is more easily pressed into the first annular groove 9, thereby ensuring smooth installation.

Claims (2)

1. The utility model provides a can dismantle rotary joint, its characterized in that, including last casing, lower casing, inner tube and swivelling tube, go up the casing with down the casing passes through flange face fixed seal connection and encloses and close and form the cavity, be equipped with first ring channel down in the casing, be equipped with spring and dynamic friction seal gasket in the first ring channel, the head end of swivelling tube set up in the cavity, the swivelling tube with the casing rotates down and is connected, the head end of swivelling tube be equipped with first ring channel complex annular boss, the spring will dynamic friction seal gasket butt in the bottom surface of annular boss and the lateral wall of first ring channel, the upper casing is equipped with the pipeline interface, the inner tube wears to establish in the swivelling tube, the swivelling tube with be equipped with O type sealing washer between the inner tube, the lower extreme threaded connection of swivelling tube extends, the extension pipe section with the internal diameter of swivelling tube is the same, the inner wall of extension pipe section with the butt joint department of the inner wall of swivelling tube is equipped with seal groove, O type set up in seal groove, the head end of swivelling tube with in the annular boss's bottom surface and the lateral wall of annular groove, the annular groove is equipped with in the annular groove through the annular groove, the annular groove is equipped with in the annular groove in the second end face of annular groove and the annular groove.

2. The detachable rotary joint according to claim 1, wherein a bearing sleeve is fixedly arranged in the lower housing, the head end of the rotary tube is arranged in the bearing sleeve, and a second ball is arranged between the outer peripheral surface of the head end of the rotary tube and the bearing sleeve.