JPS6347348Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double pipe swivel joint used in fluid piping that requires heat insulation.

In general, swivel joints are widely used as pipe joints that can rotate freely even when fluid is passing through.
Double-pipe pipes are used when piping fluids that require heat retention or when different types of fluids need to pass through at the same time. 1 and 2 show this double pipe swivel joint, in which a first double pipe piece 2 is flanged at one end 2a to one double pipe 1.
And, one end 3 is connected to the other end 2b of this first double pipe piece 2.
The second double pipe piece 3 is rotatably fitted to the second double pipe piece 3 through an intermediate member 3b, and the other end 3c is flanged to the other double pipe 4.

By the way, in this conventional double pipe swivel joint, the outer pipe passages 2c, 3d of each double pipe piece 2, 3 and the outer pipe passages 1a, 4 of each double pipe piece 1, 4
A and the outer tube passages 2c, 3d of the double tube pieces 2, 3 are connected to each other by flexible hoses 5, which has the following various drawbacks.

(1) Since the flow path cross-sectional area of the fluid flowing inside each outer tube is extremely narrowed and reduced at the flexible hose 5, the dry running time required for the temperature to rise when flowing heat-retaining fluid becomes longer and longer. .

(2) Due to the flexible hose 5, the turning movement is limited to a certain range.

(3) The connection portion of the flexible hose 5 is usually of a screw-in structure, but the fluid flowing inside each outer tube may leak from this connection point.

(4) The flexible hose 5 is at great risk of being twisted or damaged.

(5) Since the flexible hose 5 is connected in a state that protrudes outward, it is difficult to connect with surrounding equipment and piping during piping construction, and
Even during the swing operation, the flexible hose 5 may come into contact with surrounding equipment.

The present invention forms a fluid reservoir along the circumferential direction of the first double pipe piece at the fitting part between the first double pipe piece and the second double pipe piece, and the first double pipe piece A flow passage hole is provided inside the outer peripheral wall of the piece and the second double pipe piece, and a communication hole is provided inside the joining flange of each double pipe of the first double pipe piece and the second double pipe piece. , the above-mentioned conventional drawbacks are solved by allowing the fluid flowing inside the outer tube to flow through these flow passage holes, communication holes, and fluid reservoirs,
The flow path cross-sectional area of the fluid flowing inside the outer tube can be increased, and there are no problems such as appendages protruding outward or restricting the rotation range.
It is an object of the present invention to provide a double pipe swivel joint that can efficiently flow fluid.

Hereinafter, the present invention will be explained in detail based on the drawings.

3 to 5 show an embodiment of the present invention, in which numerals 10 and 11 are well-known double pipes. These double tubes 10 and 11 each have inner tubes 12 and 13 of a predetermined diameter, and an outer tube 14 that has a larger diameter than each of the inner tubes 12 and 13 and is provided concentrically with each of the inner tubes 12 and 13. 15, and is provided with joining flanges 16, 17 at one end, and one double pipe 10 and the other double pipe 11 are arranged at appropriate intervals and at right angles to each other.

The double pipe swivel joint of the present invention connects the above-mentioned one double pipe 10 and the other double pipe 11 in a freely rotating manner, and the first double pipe piece 18 attached to one of the double pipes 10 and , a second double pipe piece 1 whose one end is rotatably fitted into the first double pipe piece 18 and whose other end is attached to the other double pipe 11.
It is mainly composed of 9.

The first double pipe piece 18 includes the double pipe 1
Consisting of an inner tube 20 and an outer tube 21 with the same diameter as 0 and 11,
A joining flange 22 connecting the inner pipe 20 and the outer pipe 21 is attached to one end face thereof, and this joining flange 22 is joined to the joining flange 16 of the one double pipe 10 via bolts 23. One double pipe piece 18 and the double pipe 10 are connected to each other. Further, in the annular zone of the joining flanges 22, 16 and having the same diameter as the outer tube passages 21a, 14a in the outer tubes 21, 14, a plurality of circumferentially long communication holes 22a, 16a are provided. are provided to penetrate in the thickness direction of each joining flange 22, 16, and these communication holes 22a, 16a connect the outer pipe flow path 21a of the first double pipe piece 18 and the double pipe 1.
The outer tube flow path 14a of No. 0 is in communication with each other.
Furthermore, the outer peripheral surface 18 of the first double pipe piece 18
In a, a groove-shaped fluid reservoir portion 18b with a rectangular cross section and two groove portions 18c with a semicircular cross section are formed spaced apart from each other in the longitudinal direction and along the circumferential direction, and one of the groove portions 18b is Multiple channel holes 1
8d communicates with the outer tube flow path 21a of the outer tube 21.

On the other hand, the second double pipe piece 19
An intermediate member 2 is attached to the double pipe piece 18 so as to be rotatable about the axis of the first double pipe piece 18.
4, and a second double pipe piece main body 25 having one end attached to the intermediate member 24 and the other end attached to the other double pipe 11. The above intermediate member 2
4 is a cylindrical body having an inner diameter that is approximately the same as the outer diameter of the first double pipe piece 18, and is provided with a flange portion 24a on one side, and the end surface of the flange portion 24a is connected to the first double pipe piece 18. The other end surface of piece 18 (third
The inner circumferential surface 24b of the
, the outer circumferential surface 18a of the first double pipe piece 18
Two grooves 24 facing the upper two grooves 18c
c is formed. These groove portions 18
A plurality of steel balls 26 are fitted into each of the circumferential holes formed by holes c and 24c, and these steel balls 26 allow the intermediate member 24 to rotate relative to the first double pipe piece 18. The intermediate member 24 also has a flange portion 2 at one end.
A plurality of flow passage holes 24d are provided which are open at the end face of the double pipe piece 4a and whose other end is opened at the fluid reservoir 18b on the outer circumferential face 18a of the first double pipe piece 18.

Furthermore, the second double tube piece main body 25 is a 90° elbow-shaped double tube having an inner tube 27 and an outer tube 28 having the same diameter as the double tubes 10, 11, etc. The formed flange portion 29 is connected to the flange portion 24a of the intermediate member 24 via bolts 30, and the joining flange 31 provided at the other end is connected to the joining flange 1 of the other double pipe 11.
7 and is provided between the first double pipe piece 18 and the double pipe 11. Further, the flange portion 29 of the second double pipe piece main body 25 includes:
A plurality of passage holes 25d are provided, one end of which communicates with the passage hole 18d of the first double-pipe piece 18, and the other end of which opens into the outer tube passage 28a of the outer tube 28. Furthermore, the connecting flanges 31, 17 are provided with communicating holes 31a, 17a similar to those in the connecting flanges 22, 16, and the communicating holes 31a, 17a allow the second double pipe piece main body 25 to be The tube flow path 28a and the outer tube flow path 15a of the double tube 11 are communicated with each other.

Note that the reference numeral 32 in the figure is a gasket that seals the joint or fitting portion, and 3
Reference numeral 3 denotes a sealing member for sealing unnecessary holes created when forming the channel holes 24d and 25d. Furthermore, 3
4 is a plug that holds the steel ball 6.

Next, the operation of the present invention will be explained.

The double pipe swivel joint of the present invention is used, for example, as a bending joint for receiving and discharging crude oil in a floating roof tank, and the fluid flowing inside the inner pipe flows in the same manner as in conventional pipes.
That is, in FIG. 3, the fluid that has flowed through the inner tube flow path 12a of one of the double tube pieces 10 is transferred to the inner tube flow paths 20a and 27a of the first double tube piece 18 and the second double tube piece 19. and reaches the inner pipe flow path 13a of the other double pipe 11. Or do it the other way around. On the other hand, the fluid flowing inside the outer tube is the double tube 1
0 from the outer pipe flow path 14a to the joining flanges 16, 22
It passes through the communication holes 16a, 22a and enters the outer tube flow path 21a of the first double tube piece 18. Then, flow path hole 1
8d, fluid reservoir 18b, channel holes 24d, 25d
sequentially passes through, enters the outer pipe flow path 28a of the second double pipe piece 19, and further passes through the joining flanges 31, 17.
It reaches the outer tube flow path 15a of the double tube 11 through the communication holes 31a and 17a. Or do it the other way around.

Note that since the fluid reservoir portion 18b is provided over the circumferential direction of the first double pipe piece 18, even if the second double pipe piece 19 rotates, its flow passage hole 24d is not obstructed. You won't be disappointed.

By the way, in the above embodiment, the fluid reservoir portion 18b is located on the outer peripheral surface 18a of the first double pipe piece 18.
However, the same effect can be obtained even if it is formed on the inner circumferential surface 24b side of the intermediate member 24 of the second double pipe piece 19. Further, the second double pipe piece 19 includes an intermediate member 24 and a second double pipe piece main body 2.
5, but they may be formed integrally.

As mentioned above, since the double pipe swivel joint of the present invention does not use a flexible hose like conventional ones, the cross-sectional area of the fluid flowing inside the outer pipe can be appropriately increased, and heat retention is achieved. It is possible to shorten the idle time required for temperature rise when flowing fluid. In addition, there are no restrictions on the range of rotation, and there are no problems with contact or contact with surrounding equipment. In addition, by selecting the materials of the joint body and packing to match the type of fluid flowing through the inner and outer tubes, temperature, and other operating conditions, it can be used in a wide range of applications, and its durability and Maintainability is also significantly improved compared to the conventional model.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional double pipe swivel joint.
The figure is a sectional view taken along the - arrow in FIG. 1. 3 to 5 show an embodiment of the present invention, in which FIG. 3 is a cross-sectional view, FIG. 4 is a view taken along the - arrow in FIG. 3, and FIG. It is an arrow sectional view. 10...Double pipe, 11...Double pipe, 18...First double pipe piece, 19...Second double pipe piece, 2
2...Joining flange, 22a...Communication hole, 16a
...Communication hole, 18b...Fluid reservoir, 18d...
Channel hole, 6... steel ball, 24d... channel hole, 31... joint flange, 25d... distribution hole,
31a...Communication hole, 17a...Communication hole.

Claims (1)

[Scope of utility model registration request] The first one is flanged at one end to one double pipe.
A double pipe piece, one end of which is fitted to the other end of the first double pipe piece so as to be rotatable about the axis of the first double pipe piece, and the other end is flange-coupled to the other double pipe. In the double pipe swivel joint, the fitting portion of the first double pipe piece and the second double pipe piece is provided with a circumferential direction of the first double pipe piece. An annular fluid reservoir is formed along the outer circumferential wall of the first double pipe piece and the second double pipe piece, and the outside of each of the first double pipe piece and the second double pipe piece is formed inside the outer peripheral walls of the first double pipe piece and the second double pipe piece. A flow passage hole is provided for communicating the pipe flow path with the fluid reservoir, and inside the joining flange of the first double pipe piece and the second double pipe piece with each of the double pipes, a second double pipe is provided. 1
A double pipe swivel joint characterized in that a communication hole is formed for communicating each outer pipe flow path of a double pipe piece and a second double pipe piece with each outer pipe flow path of the double pipe.