JPS6014238B2 - Swivel joint for high pressure liquids - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swivel joint that guides high-pressure liquid within a fixed tube into a rotating tube that is slidable and rotatable with respect to the fixed tube.

Traditionally, water swivel joints for oil wells, etc.
Since it is an oil bath type and uses a simple mechanical seal to prevent leakage of high-pressure liquid on the sliding surfaces of the fixed tube and swivel tube, the shape of the swivel joint is large.
In the case of ultra-high pressure liquids, it is extremely difficult to achieve a perfect seal, and maintenance and management thereof is also complicated and requires a large amount of cost.

The present invention solves the above-mentioned conventional drawbacks, constantly and accurately prevents leakage of high-pressure liquid on sliding surfaces, maintains a constant gap between a fixed tube and a rotating tube, and supplies lubricating oil to the gap. The purpose of this is to ensure reliable supply, smooth rotation of the rotating tube, and prevent damage to the sliding surface.

The present invention provides a swivel joint for guiding high-pressure liquid inside a fixed tube into a rotating tube that slides and rotates with the fixed tube. A lubricating oil chamber is provided near the sliding part of the swing tube, and a cylinder member is further provided near the collar to tightly surround the fixed pipe and hold the swing pipe, thereby forming a cylinder part between the swing pipe and the fixed pipe. At the same time, a hydraulic piston for supporting the position of the fixed pipe is inserted into the flange of the fixed pipe within the cylinder, and a lubricating oil tank is provided through which a portion of the high-pressure liquid to be introduced into the fixed pipe is conveyed. A floating piston is provided to divide the inside of the tank into a pressurizing part for guiding the high-pressure liquid and a lubricating oil outlet part,
The swivel joint for high-pressure liquid is characterized in that the lubricating oil outlet portion is communicated with the lubricating oil chamber and the cylinder portion.

Embodiments of the present invention will be described with reference to the drawings.
1 is a fixed tube connected to a high-pressure liquid, and a rotating tube 2 that guides the high-pressure liquid in the fixed tube 1 and rotates by sliding on the end surface of the fixed tube 1 is disposed at its end. A cylindrical flange 3 is formed on the outer periphery of the end of the fixed tube 1, and the fixed tube 1 and the rotating tube 2 are connected within the flange 3.
A lubricating oil chamber 6 is formed in the vicinity of the sliding portion with a packing and a packing presser 5 interposed therebetween. Furthermore, in the vicinity of the collar 3, a cylinder member 10 is provided, which is defined by a support frame 21 that rotatably holds the swing tube 2 near its end, and which tightly hugs the fixed tube 1. A cylinder part is formed in the cylinder part, and a hydraulic piston for holding the position of the fixed pipe, which corresponds to the main part of the fixed pipe 1, is inserted into the cylinder part. Further, a lubricating oil tank 12 is provided, through which a part of the high-pressure liquid introduced into the fixed pipe 1 is branched and communicated.
A floating piston 13 is provided in the tank 2 to divide the inside of the tank into a pressurizing part 14 for conveying the high-pressure liquid and a lubricating oil outlet part 15. It is connected to a lubricating oil chamber 6 provided nearby through a flow path 7, and is also communicated to a cylinder portion formed between a cylinder portion 10 and a fixed pipe 1 through a flow path 11.

Note that oil grooves 8 are provided in the radial and circumferential directions to maintain a lubricating oil film on the sliding surface of the fixed tube 1 and the rotating tube 2, so that the lubricating oil chamber 6 It is often recommended to connect the inner diameter of the fixed tube 1 near the sliding part to the rotating tube 2.
By making the inner diameter slightly smaller than the inner diameter of the pipe, leakage of high pressure liquid inside the pipe can be more accurately prevented.

In the figure, 16 is ○ ring, 17 and 18 are packing, 19
2 indicates a ball bearing, and 20 indicates a bearing holder.

Therefore, when high-pressure liquid is guided from the fixed pipe 1 to the revolving pipe 2, the lubricating oil in the lubricating oil tank 12 is constantly connected to the gap between these sliding parts through the flow path 7 and the lubricating oil chamber 6. The lubricating oil supplied to the lubricating oil chamber 6 keeps the rotation smooth, and the lubricating oil supplied to the lubricating oil chamber 6 is partially guided into the fixed pipe 1 to keep the pressurized part 14 of the lubricating oil tank 12 in check. The pressure is the same as that of the high-pressure liquid through the pipe, and leakage of the high-pressure liquid flowing from the fixed pipe 1 to the rotating pipe 2 at the sliding part is accurately prevented.

Further, the lubricating oil having the same pressure as the high-pressure liquid is supplied into the lubricating oil chamber 6 through the flow path T as described above, and at the same time,
1 and into the cylinder part formed by the cylinder member 10, and presses the fixed position holding hydraulic piston 9, thereby preventing the fixed pipe 1 from moving away from the revolving pipe 2 due to the pressure inside the lubricating oil chamber 6. The position of the fixed tube 1 and the rotating tube 2 can be maintained with a constant gap, and the sliding part between the fixed tube 1 and the rotating tube 2 can maintain a constant lubricating oil film with a small gap, which makes the rotation of the rotating tube 2 smooth. It also prevents damage to the bonito lacquer on the surishi surface.

As described above, the high-pressure liquid swivel joint according to the present invention always accurately prevents leakage of high-pressure liquid, makes it easy to always supply an appropriate amount of lubricating oil to the sliding parts, and evenly It has extremely superior effects compared to conventional ones, such as maintaining a constant minute gap, smoothing the rotation of the swivel tube, preventing damage to the sliding surface, and simplifying maintenance. It has the following.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a plan view of the sliding surface of the fixed tube. . 1...Fixed pipe, 2...Swivel pipe, 3...
... Flange, 6 ... Lubricating oil chamber, 7 ... Channel, 9 ... Hydraulic piston for holding fixed position, 10
...Cylinder member, 1 1...Flow path, 1
2... Lubricating oil tank, 13... Idle piston, 14... Pressurizing part, 15... Lubricating oil outlet part. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1. In a swivel joint that guides high-pressure liquid inside a fixed tube into a rotating tube that slides and rotates with the fixed tube, a cylindrical flange is formed at the end of the fixed tube to prevent sliding between the fixed tube and the rotating tube inside the swivel joint. A lubricating oil chamber is provided near the moving part, and a cylinder member is provided near the collar that tightly surrounds the fixed pipe and holds the swing pipe, forming a cylinder part between the fixed pipe and the cylinder. A hydraulic piston for holding the position of the fixed tube that contacts the flange of the fixed tube is inserted into the part, a lubricating oil tank is provided with which a portion of the high-pressure liquid introduced into the fixed tube communicates, and a floating piston is provided within the tank. A swivel joint for high-pressure liquid, characterized in that the inside of the tank is divided into a pressurizing part for guiding the high-pressure liquid and a lubricating oil outlet part, and the lubricating oil outlet part is communicated with the lubricating oil chamber and the cylinder part. .