JPH08219345A - Expansion pipe joint - Google Patents

Abstract

PURPOSE: To enable the replacement of packing without disassembling and adjust the dislocation of a bolt hole easily without using another power device or the like by making the length of an inner cylinder pipe longer than that of an outer cylinder pipe in the seal position of the outer and inner cylinder pipes, and providing packing on the periphery of the inner cylinder pipe protruding from the outer cylinder pipe. CONSTITUTION: In order to replace packing 12 without disassembling an outer cylinder pipe 9 and an inner cylinder pipe 8, the length of the inner cylinder pipe 8 is made longer than that of the outer cylinder pipe 9, and the packing 12 such as an O-ring is mounted to the outer periphery of the inner cylinder pipe 8 protruding from the outer cylinder pipe 9. An adjacent short pipe is thereby disconnected and moved without disassembling the inner cylinder pipe 8 from the outer cylinder pipe 9. Dislocation adjusting devices 14, 15 for adjusting the mutual dislocation of the fastening bolt hole of a mating flange to be fastened have male-female conical centering means fitted into the mutual bolt hole of the mating flange to be fastened to the expanding/ contracting inner cylinder pipe 8 and forcibly correct vertical and circumferential dislocation by the thrust of pushing out the cylindrical pipe, with the conical face as a guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a case where a test object is fixed in a test site where discharge and suction ports are fixed, for performing a performance test of a pump for transporting water, oil and gas. The present invention relates to a test device that absorbs changes in height and length of a device under test with piping.

[0002]

2. Description of the Related Art As a conventional test apparatus in a test site where discharge and suction ports are fixed, after placing a pump or the like at a predetermined position, the height of the discharge port or suction port and the length of each distance from the pump. The pipes were aligned and manufactured and joined.

Further, the telescopic tube whose length can be adjusted is
There are the following:

1) Sleeve system shown in JIS G5527 "Ductile cast iron deformed pipe" 2) Bellows type bellows type expansion and contraction flexible joint using materials such as metal and rubber. The expansion and contraction length of these is 50 to 200 mm. Short,
There was a problem with maintainability, such that the packing of the seal part for maintaining watertightness and airtightness could not be replaced unless the outer cylinder and the inner cylinder were disassembled.

Further, there is no one having a mechanism for correcting the positional deviation of the bolt holes of the mating flange to be fastened.

[0006]

In order to replace the packing for keeping the watertightness and airtightness of the above-mentioned conventional expansion tube, it is necessary to pull out the inner cylinder tube from the outer cylinder tube and replace the packing. It took a lot of time to reassemble after replacing the packing.

Further, as for the displacement of the positions of the flange tightening bolt holes to be fastened, the flanges are overlapped with each other, the displacement is measured, and then the inner cylindrical pipe is rotated in the circumferential direction by power driving or hammering, Further, with respect to the radial deviation, it was tightened by pulling it up with a jack or a crane.

The present invention intends to replace the packing for keeping the watertightness and airtightness of the expansion tube without extracting the inner tube from the outer tube.

Further, the positional deviation of the flange tightening bolt holes to be fastened can be easily carried out by utilizing the axial thrust for pushing the inner cylindrical tube of the expansion tube driving device without measuring the deviation amount or using other power. It is what you want to do.

[0010]

[Means for Solving the Problems] In order to replace the packing without disassembling the outer cylinder tube and the inner cylinder tube, the length of the inner cylinder tube is made longer than that of the outer cylinder tube and By mounting a packing such as an O-ring on the outer circumference of the protruding inner cylinder pipe, the adjacent short pipes can be disengaged and moved without disassembling the inner cylinder pipe from the outer cylinder pipe.

Further, the positional deviation adjusting device for the tightening bolt hole with the mating flange to be fastened is such that the male and female conical centering tools are provided in the respective bolt holes of the mating flange to be fastened with the expanding and contracting inner cylindrical pipe. Is attached, and the thrust force that pushes out the cylindrical tube is used to forcibly correct the displacement in the vertical and circumferential directions using the conical surface as a guide.

[0012]

[Function] When replacing the packing, use the expansion tube drive device,
After making it the most contracted state, unfasten the short tube adjacent to the expansion tube and replace the packing such as the O-ring through the gap. This makes it possible to replace the packing without disassembling the inner tube from the outer tube.

To adjust the positional deviation of the fastening bolt holes of the flange to be fastened, insert male and female conical centering tools into the two equally spaced positions of the bolt holes of the flange, and push out the inner tube. The conical surfaces are brought into contact with each other by the axial thrust to adjust the positional deviation. Once the misalignment is adjusted, retract the expansion tube to remove the centering tool, and then tighten it again.

The connecting portion between the drive unit attached to the outer cylindrical tube and the inner cylindrical tube is arranged to be freely movable in the circumferential direction.

As a result, the position of the bolt hole can be adjusted by operating the drive device and pushing out the inner cylindrical pipe.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a side view of the pumpability test setup. In FIG. 1, the pump base 5 is fixed and the installation center position of the pump 1 is determined. Further, the suction port or the discharge port 6 of the test site is also fixed. The length L ₀ of the pump 1 and the height h of the suction port or the discharge port vary depending on the model and size. The parallel pipe 7 is a straight pipe regulated by the test conditions, and 3 is a reducer for adjusting the diameter of the pump 1. Even if the length of the pump 1 is changed with respect to the center distance L of the suction port or the discharge port pipe of the test site, the expansion pipe 2 is used so that it is not necessary to manufacture the pipe according to the length each time.

Similarly, also in the height direction, the expansion and contraction tube 2 is used in order to respond to the fluctuation of h and adjust H to be constant.

(Embodiment 1) FIG. 2 is an explanatory view of an expansion pipe joint. The inner tube 8 is the drive device 1 attached to the outer tube 9.
Expands and contracts by 0. The inner tube is made longer than the outer tube, and a seal such as an O-ring is provided for the purpose of sealing the gap between the outer tube and the outer tube of the inner tube 8 protruding from the outer tube when the tube is most compressed to keep watertightness. Install 12.

The O-ring 12 is always in contact with the inner surface of the outer tube 9 to keep airtightness except when the packing is replaced.

(A) and (c) show the state where the expansion joint is contracted most, and (b) shows the state where it is expanded most. FIG. 3 shows FIG.
It is an enlarged view of the A section of (a).

Since the position of the O-ring is provided on the outer circumference of the inner cylindrical tube extending by S from the length of the outer cylindrical tube, it is possible to remove the short tube 4 shown in FIG. Inner tube 8
The O-ring can be replaced without pulling out.

(Embodiment 2) FIG. 4 shows the shapes of the flange bolt tightening holes of the inner cylindrical pipe 8 and the mating reducer 3 and the state in which a bolt hole position adjuster is attached to the bolt tightening holes.

In this state, the bolt hole position adjusting tools 14, 15
The inner tubular tube 8 is extended until they come into contact. If there is a phase shift, the position shift is adjusted while displacing the inner cylindrical tube in the circumferential direction using the conical surfaces of the bolt hole position regulating tops 14 and 15 as guides.

By setting the large diameter of the cone of the bolt hole position adjusting tool to be equal to or larger than the flange bolt hole pitch, it is possible to adjust any positional deviation in the circumferential direction.

In order to allow the inner cylinder tube 8 to be displaced in the circumferential direction, the driving device 10 for pushing the inner cylinder tube and the inner cylinder tube 8 are connected to each other by a T-shaped groove on the side surface of the flange as shown in FIG. Put the T-shaped piece 11 whose tip is processed into a sphere into it,
The structure is such that it is connected to the piston of the drive unit 10.

With this structure, it is possible to absorb the circumferential displacement adjusted by the bolt hole position adjuster.

FIG. 5 shows a state in which the inner tube 8 is extended and fastened to the flange surface of the mating reducer 3. After the conical surfaces of the bolt hole position adjusters 14 and 15 are brought into full contact with each other to adjust the phase in the circumferential direction, the inner cylindrical pipe 8 is contracted, the bolt hole position adjusters 14 and 15 are removed, and then the bolt hole position adjusters 14 and 15 are stretched again and bent by their own weight. Adjustment of a slight displacement due to the above is performed by the conical surface of the bush 13 protruding from the inner cylindrical pipe flange shown in FIG. 5 and the chamfered portion of the bolt hole of the mating flange.

As a result, it becomes possible to shift the position in the circumferential direction and due to the deflection of its own weight or the like by utilizing the axial thrust of the expansion and contraction drive device.

[0030]

The packing 12 replacement method of the present invention is different from the conventional method of pulling out the inner cylinder tube 8 from the outer cylinder tube 9 and disassembling and replacing the inner cylinder tube 8 with the expansion / contraction drive device 10 and the inner cylinder tube 8. Since there is no need to pull out, disassemble and reassemble, it is only necessary to disengage and move the adjacent short pipes, and the replacement time can be greatly reduced.

The method for adjusting the displacement of the bolt hole position of the flange to be fastened according to the present invention uses the axial thrust of the telescopic drive device, as compared with the conventional adjustment method using the power of a hammer or a crane. Since it is possible to do so, no other power is required, and the adjustment work time for adjusting the bolt hole position deviation of the flange to be fastened can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a side view of a pump performance test setup.

FIG. 2 is an explanatory view of the expansion joint of the present invention.

FIG. 3 is a sectional view of a portion A in FIG.

FIG. 4 is a mounting cross-sectional view of a flange bolt hole position deviation adjuster.

FIG. 5 is a cross-sectional view of a bolt hole portion in a flange fastening state.

[Explanation of symbols]

8 ... Inner cylinder tube, 9 ... Outer cylinder tube, 10 ... Expansion / contraction drive device, 14,
15 ... Misalignment adjuster.

Claims (1)

[Claims] 1. An outer tube and an inner tube provided for expansion and contraction in an expansion joint, which is used to support tests of various heights and lengths in a test site where a discharge port and a suction port are fixed. A telescopic tube characterized in that the sealing position of the tube is such that the length of the inner tube is longer than that of the outer tube, and packing is provided on the outer periphery of the inner tube protruding from the outer tube at the maximum contraction position. Fitting.