JPH04331889A - Rotary pipe joint - Google Patents

Abstract

PURPOSE:To feed several kinds of fluids under high pressure even at a high rotational speed, and to increase the flow rate of the fed fluid. CONSTITUTION:A supply side stationary pipe 1 and a cylindrical frame 3 are rotatably fitted together through the intermediary of a bearing 18. A plurality of gland packings 6, 6,... for sealing a pump bearing are disposed in series between both members 1, 3, inside of the bearing 18 so as to rotatably seal a shaft at multiple stages. Further, the inner and outer end parts of the bearing 18 are rotatably shaft-sealed by means of O-rings 29, 30, and an oil feed port 23 is communicated with the bearing 18.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pipe joint for airtightly connecting a fixed pipe and a rotary pipe.

0002

[Prior Art] Rotating pipe joints that airtightly connect fixed pipes and rotating pipes have been used in various configurations.
Generally, the structure is such that sliding rings provided on the fixed side and the rotating side are slid and rotated closely. That is, a pair of sliding rings are slid and rotated closely at the connecting portion, and the frictional force between the two sliding rings seals the fluid transferred within the pipe.

0003

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional rotary pipe joint, since the pair of sliding rings slide and rotate closely to form a seal, solids or particles may not be present in the fluid flowing inside the pipe. If any foreign matter is mixed in, the foreign matter will be caught in the sliding surfaces of both sliding rings, resulting in a drawback that liquid leakage will occur. For this reason, this type of rotary joint has low pressure (1
However, it was possible to transfer only a very limited amount of fluid under a pressure of 6 kg/cm2 or less, and the rotational speed was as low as 2,000 rpm, so improvements were desired. Furthermore, since the pipe diameter that can be manufactured is limited to 125 mm or less, there are problems such as inability to secure a sufficient processing flow rate.

The present invention has been made in view of the above problems, and has the following features: (1) Various fluids can be transferred. (2) High-pressure fluid can be passed through. (3) It can be used even at high speed rotations of 2,000 rpm or more. (4) A fluid transfer pipe with a large diameter can be configured to increase the flow rate of the transferred fluid. The purpose of this invention is to provide a rotating pipe joint with a new configuration.

[0005]

[Means for Solving the Problems] A rotary pipe joint according to the present invention includes a fixed side cylindrical member and a rotary side cylindrical member that are rotatably inserted into and out of each other via a bearing, and that are located inside the bearing. A plurality of seal members are inserted in series between both members,
In addition to rotatably sealing the shaft in multiple stages, the inner and outer ends of the bearing are rotatably sealed via a sealing member such as an O-ring, and the oil supply port is communicated with the bearing. It is desirable that the plurality of seal members constituting the multi-stage shaft seal section be gland packings for pump shaft bearing seals.

[0006]

[Function] According to the above structure, the number of gland packings for pump bearing seals in the multi-stage shaft sealing section can be increased or decreased as appropriate depending on the demand for hydraulic pressure, for example, 200 kg/cm.
It is also possible to transport fluids at extremely high pressures such as 2. Further, in the above configuration, since the diameter of the pipe can be set freely, the flow rate of the transferred fluid can be increased by configuring a thick fluid transfer pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotary pipe joint according to the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cylindrical supply-side fixed pipe, which is connected to a supply-side fixed pipe (not shown). The supply side fixed pipe 1 is rotatably inserted into the cylindrical frame 3 of the distribution side rotating body 2 via a bearing device 4, and is connected to the cylindrical inner step 5 of the cylindrical frame 3 and the supply side. A plurality of pump bearing seal gland packings 6, 6... are rotatably and airtightly inserted in series between the outer peripheral surface of the fixed pipe 1 (backup is provided on the back of each pump bearing seal gland packing 6 as necessary) (A ring may also be provided.) The end of the pump bearing seal gland packing 6 is supported by a packing holding flange 8 fastened to the end of the cylindrical frame 3 with bolts 7. Further, the distribution side rotating body 2 is connected to the large diameter portion 1 of the hopper 9.
0 is airtightly connected to the lower end of the cylindrical frame 3 via an O-ring 11, tightened with a bolt 12, and provided in a small diameter portion 13 to a rotating pipe (not shown) on the distribution side. A rotating side connecting flange 14 is configured to connect with the flange.

The bearing device 4 has two bearings 18 disposed between the cylindrical outer stage portion 15 of the cylindrical frame 3 and the supply side fixed tube 1 via a bearing inner diameter collar 16 and a bearing outer diameter collar 17. , 18 are interposed in series, and the position of the rear end of the outer bearing 18 is regulated by a stop ring 20 which is ring-fitted in the circumferential groove 19 of the supply side fixed pipe 1.
7 is provided with a through hole 22 that communicates the inner diameter with a circumferential groove 21 provided on the outer periphery, and a refueling port 23 provided in the cylindrical frame 3 is provided at a position facing the circumferential groove 21. Become. The bearing device 4 is supported by space collars 26 and 27 inserted between the inner surface of a frame cover plate 25 fastened to the rear end of the cylindrical frame 3 with bolts 24, an outer bearing 18, and a stop ring 20. The circular hole 28 of the frame cover plate 25 inserted over the supply-side fixed tube 1 is held airtightly and rotatably via an O-ring 29. Reference numeral 30 denotes an O-ring that is airtightly and rotatably inserted between the supply-side fixed pipe 1 and the cylindrical frame 3 at the inner end of the bearing device 4.

A circumferential groove 31 is provided on the inner diameter of the cylindrical frame 3 on the pump shaft bearing sealing gland packing 6 side of the O-ring 30, and communicates with a liquid leak detection port 32.

[0010] The rotary pipe joint having the above structure has a fixed pipe 1 on the supply side.
It allows fluid to flow from the hopper 9 to the hopper 9, which is equipped with a rotating side connecting flange 14. During use, a predetermined hydraulic pressure P is applied from the oil supply port 23, and the presence or absence of liquid leakage from the liquid leakage detection port 32 is checked. Do it under control. That is, since both ends of the bearing device 4 of the rotary pipe joint are sealed by O-rings 29 and 30, and the oil pressure from the oil supply port 23 is applied to these parts, the bearing device 4 of the rotary pipe joint is connected to the fixed pipe 1 on the supply side. It acts to increase the back pressure of the pump shaft bearing seal gland packing 6 that seals between the cylindrical frames 3, prevents foreign matter from entering the seal portion, and stably maintains sealing performance.

[0011]

Effects of the Invention As described above, the rotary pipe joint according to the present invention uses hydraulic pressure generated by pressurizing the bearing section inserted between both rotating parts to close the gland for the pump bearing seal inserted between both rotating parts. By maintaining the back pressure of the packing at a high pressure, it prevents foreign matter from entering the seal part and maintains stable sealing performance.As a result, various fluids can be transferred, and high-pressure fluids can be transferred. can be used at high speeds. Furthermore, since it is possible to configure a fluid transfer pipe with a large diameter,
It has features such as being able to increase the flow rate of the transferred fluid, and the practical effects after implementation of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary pipe joint according to the present invention.

[Explanation of symbols]

1 Supply side fixed pipe 2 Distribution side rotating body 3 Cylindrical frame 4 Bearing bearing device 6 Gland packing for pump bearing seal 8 Packing holding flange 9 Hopper 11, 29, 30 O ring 14 Rotating side connection flange 16, 17, 26, 27 Collar 18 Bearing 20 Stop ring 22 Through hole 23 Oil supply port 25 Frame cover plate 32 Liquid leakage detection port

Claims (2)

[Claims] Claim 1: A fixed side cylindrical member and a rotating side cylindrical member are rotatably inserted into and inserted into each other via a bearing, and a plurality of seal members are inserted in series between the two members at a position inside the bearing. , the shaft is rotatably sealed in a multi-stage manner, and the inner and outer ends of the bearing are rotatably sealed via a sealing member such as an O-ring, and the oil supply port is communicated with the bearing part. A rotating pipe joint featuring: 2. The rotary pipe joint according to claim 1, wherein the plurality of seal members constituting the multistage shaft seal portion are gland packings for pump shaft bearing seals.