Pipe connection compensation device by magnetic fluid sealing

Patent metadata

Field	Value
Publication number	US-11199265-B2
Application number	US-201816466900-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Jan 15, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A pipe connection compensation device by magnetic fluid sealing comprising a compensation pipe, sealed end cap, coil, annular permanent magnet and tightening rod is provided, designed and configured in a novel manner to ensure the pipe connection compensation device by magnetic fluid sealing achieves a better sealing effect.

First claim

The invention claimed is:

1. A pipe connection compensation device by magnetic fluid sealing comprises a first flange pipe and a second flange pipe, the second flange pipe comprises the second flange plate and the second joint pipe, the second flange plate is concentrically welded and fixed to the second joint pipe; the first flange pipe comprises a first flange plate, a first joint pipe and a flange ring, the first flange plate and the flange ring are welded and fixed via the first joint pipe; wherein the pipe connection compensation device by magnetic fluid sealing further comprises a connection compensation device, the connection compensation device comprises a compensation pipe, a sealed end cap, a coil, an annular permanent magnet and a tightening rod; one end of the compensation pipe is connected to the flange ring, the other end of the compensation pipe is connected to the sealed end cap, and the second joint pipe penetrates into the sealed end cap; the sealed end cap fits with the second joint pipe in clearance fit; an inner wall of the sealed end cap is provided with a first annular liquid storage groove and a second annular liquid storage groove, the outer wall of the sealed end cap is provided with the a first annular groove and a second annular groove, which are axially arranged; the coil is wound around the first annular groove, and the annular permanent magnet is installed in the second annular groove; the radial gap between the sealed end cap and the second joint pipe, the first annular liquid storage groove, the second annular liquid storage groove, and a radial gap between the compensation pipe and the sealed end cap form a gap chamber, which is filled with the magnetic fluid; the first flange pipe and the second flange pipe are connected via the tightening rod; one end of the tightening rod fixes the first flange tube through fastening nuts, and the other end of the tightening rod is provided with the limiting nuts for limiting the axial limit position of the second flange pipe.

2. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, one end face of the second annular groove is on the same normal plane as one end face of the first annular liquid storage groove.

3. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, the first annular groove is located between the first annular liquid storage groove and the second annular liquid storage groove.

4. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, the sealed end cap is provided with a filling hole and the filling hole is in communication with the gap chamber.

5. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, the outer ring of the second joint pipe inserted into the sealed end cap is provided with a liquid storage groove.

6. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, the nominal diameter of the second joint pipe and the first joint pipe are both d 0 ; the wall thickness of the second joint pipe is δ 1 , the wall thickness of the first joint pipe is δ 2 , wherein, the determining equation of the wall thickness δ 1 of the second joint pipe is:

δ
1

=

P
0

⁢

D
0

2
⁡

[
δ
]

t

⁢

E
j

,

when δ 1 ≤4 mm, δ 1 =4 mm
Where,
d 0 —Nominal diameter of the second joint pipe, mm;
P 0 —Design pressure of fluid in the pipeline, Mpa;
D 0 —The outer diameter of the second joint pipe, D 0 =d 0 +2δ 1 , mm;
[δ] t —Material allowable stress of the second joint pipe, Mpa;
E j —Welded joint coefficient of the second joint pipe;

the wall thickness δ 2 of the first joint pipe is not less than the wall thickness δ 1 of the second joint pipe.

7. The pipe connection compensation device by magnetic fluid sealing according to claim 1 , wherein, the number of turns N and the current I of the coil should satisfy the following equation:

IN
≥

P
0

⁢

L

4
⁢
1

⁡

[

(

d
0

+

2
⁢

δ
1

+

2
⁢
ɛ

)

2

-

(

d
0

+

2
⁢

δ
1

)

2

]

1
⁢

0
6

⁢
ζ
⁢

⁢

Bd

4
⁢
1

Assignees

• Univ Jiangsu
• Inst Of Fluid Engineering Equipment Jitri

Inventors

• Liu Houlin
• Zhang Zilong
• Luo Kaikai
• Wang Yong
• Wang Kai
• Dong Liang
• Tan Minggao

Classifications

• F16L51/00

  Expansion-compensation arrangements for pipe-lines (telescopic pipes F16L27/12) · CPC title

• F16L27/12

  allowing substantial longitudinal adjustment or movement (by use of screw-thread F16L15/02) · CPC title

• F16J15/43 Primary

  kept in sealing position by magnetic force · CPC title

• F16L27/12751 Primary

  the threaded bolt extending longitudinally · CPC title