JPH0663991U - Fluid transport pipe terminal fittings - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the inner pipe of the fluid transportation pipe has dimensional variations or the elastic force of the packing is reduced, the fluid tightness is easily maintained and the fluid inside is transported. Prevent outflow from the pipe. [Structure] The terminal fitting 10 is attached to the exposed end 14A of the inner pipe 14 of the fluid transport pipe 12 in a fluid-tight manner via a packing 24, and to the end of the terminal fitting body 26. And a pressing fitting 28 for pressing the packing 24. A sleeve 32 made of a shape memory alloy is provided between the inner pipe 14 and the packing 24. This shape memory alloy sleeve 32
In the working atmosphere of the fluid transport pipe 12 returns to a perfect circle having a memorized shape and presses the packing 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a terminal fitting of a fluid transportation pipe that transports a high-pressure fluid such as crude oil or natural gas collected from an offshore oilfield.

[0002]

[Prior art]

 This type of fluid transport pipe consists of a plastic inner pipe, inner and outer metal reinforcing layers provided on the inner pipe, and a sheath provided on the outer metal reinforcing layer, and its end is provided. A terminal fitting is attached to the section. As shown in FIG. 7, this terminal fitting is conventionally a terminal fitting body 26 fluid-tightly fitted to the exposed end portion 14A of the inner pipe 14 via a packing 24, and an end portion of the terminal fitting body 26. It is equipped with a pressing metal fitting 28 which is attached to and presses the packing 24. The packing 24 is generally formed of an elastic material such as rubber. As shown in FIG. 7, the packing 24 is inserted into the inner pipe 14 and pressed by the pressing metal fitting 28 into the terminal metal fitting body 26. The space between the main body 26 and the inner pipe 14 is kept fluid-tight to prevent the internal fluid 34 from flowing out of the fluid transport pipe 10. In FIG. 7, reference numeral 22 is an outer case that is fixed in a fluid-tight manner across the terminal fitting body 26 and the sheath of the fluid transport pipe 10.

[0003]

[Problems to be solved by the device]

 However, in this conventional technique, when the inner pipe has a variation in size such that the inner pipe has a slightly elliptical shape instead of a perfect circle due to the dimensional tolerance of the inner pipe, a gap is generated between the packing and the inner pipe. As a result, the sealing function of the packing does not work sufficiently and the fluid inside may flow out of the fluid transport pipe. For this reason, in this conventional technique, in order to maintain fluid tightness, it is necessary to adjust the packing size according to the inner pipe and process the terminal metal fittings each time, and there is a drawback that assembly is troublesome. It was In addition, in this conventional technique, when the elastic force of the packing is reduced due to long-term use or the like, the force for tightening the inner pipe of the packing is weakened, the fluid tightness cannot be sufficiently maintained, and the internal fluid is transported by the fluid. There was a risk of spillage outside the pipe.

The object of the present invention is to avoid the above-mentioned drawbacks, maintain the fluid tightness easily and surely even when the inner pipe has a variation in size or is used for a long period of time, and is a fluid transport pipe for the internal fluid. It is intended to provide a terminal fitting for a fluid transportation pipe that can sufficiently prevent outflow to the outside.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a terminal fitting body that is fluid-tightly fitted to an exposed end portion of an inner pipe of a fluid transportation pipe through a packing, and is attached to the end portion of the terminal fitting body. In a terminal fitting of a fluid transportation pipe having a pressing metal fitting for pressing the packing with a shape memory alloy sleeve that is disposed between the inner pipe and the packing and covers the exposed end of the inner pipe. The present invention provides a terminal fitting for a fluid transportation pipe, which is set so as to return to a memorized shape in the use atmosphere of the fluid transportation pipe and press-contact the packing.

[0006]

[Action]

 If a sleeve made of a shape memory alloy is provided on the exposed end of the inner pipe in this way, the sleeve will return to the memorized shape even if the inner pipe has different dimensions or the packing has a reduced elastic force. As a result, the packing is pressed between the inner pipe and the terminal fitting body, so that the fluid tightness can be maintained easily and reliably, and the outflow of the internal fluid can be sufficiently prevented.

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a fluid transport pipe 12 including a terminal fitting 10 of the present invention. The fluid transport pipe 12 includes a plastic inner pipe 14 and The inner pipe 14 includes inner and outer metal reinforcing layers 16 and 18, and a sheath 20 provided on the outer metal reinforcing layer 18. The terminal fitting 10 of the present invention is attached to the exposed end portion 14A of the inner pipe 14 as shown in FIG.

As shown in FIG. 2, the terminal fitting 10 includes a terminal fitting body 26 that is fluid-tightly fitted to the exposed end portion 14 A of the inner pipe 14 via a packing 24, and the terminal fitting body 26. The pressing metal fitting 28 is attached to the end portion and presses the packing 24, and the metal or plastic outer case 22 is mounted across the terminal metal fitting body 26 and the sheath 20.

As shown in FIG. 1, the terminal fitting body 26 has a substantially cylindrical shape in which a fluid passage hole 26 A through which a fluid such as oil to be transported passes is formed. It is connected to a pipe or equipment by bolting.

As shown in FIGS. 1 and 2, the packing 24 is fitted into a packing fitting hole 26 B formed by cutting out a part of the contact surface of the terminal fitting body 26 with the inner pipe 14, and the terminal The metal fitting body 26 and the inner pipe 14 are kept fluid-tight. That is, the packing 24 is arranged along the outer circumference of the inner pipe 14 and is composed of an O-ring or the like formed of an elastic material such as rubber. Therefore, the packing 24 acts to tighten the outer circumference of the inner pipe 14 by its elastic force, and prevents the internal fluid from flowing out of the fluid transport pipe 10.

As shown in FIGS. 1 and 2, the pressing fitting 28 has an engaging portion 28A that is engaged with the packing fitting hole 26B of the terminal fitting body 26, and the fitting portion 28A is used as the packing fitting hole 26B. After being engaged in the terminal fitting body 26, it is attached to the end portion of the terminal fitting body 26 while adjusting the pushing condition with the push bolt 30. In this way, the engaging portion 28A is pushed into the packing fitting hole 26A, so that the pressing fitting 28 presses the packing 24 into the packing fitting hole 26B, and the packing 24 causes the fluid tight connection between the inner pipe 14 and the end fitting main body 26. The position of the packing 24 is held so that

The end fitting 10 of the fluid transportation pipe 12 of the present invention further includes a sleeve 32 made of a shape memory alloy disposed between the inner pipe 14 and the packing 24, as shown in FIGS. 2 and 3. Is equipped with. As the shape memory alloy used as the material of the sleeve 32, it is desirable to use one based on stainless steel or an NT alloy so as not to be corroded by the internal fluid.

As shown in FIGS. 3 and 4, the sleeve 32 is put over the outer circumference of the exposed end portion 14 A of the inner pipe 14 in the longitudinal direction. Therefore, as shown in FIGS. 2 and 3, the packing 24 is in contact with the outer peripheral surface of the sleeve 32 put on the inner pipe 14, and the exposed end portion 14A of the inner pipe 14 is inserted through the sleeve 32. Maintains fluid tightness by tightening.

Further, in the embodiment of FIGS. 3 and 4, the shape memory alloy sleeve 32 is set to have a storage shape of a perfect circle along the outer circumference of the inner pipe 14. Therefore, even if the inner pipe 14 is formed into an elliptical shape by crossing the dimensions, the sleeve 32 returns to the memory shape, the inner pipe 14 is straightened, and the sleeve 30 presses the packing 24. To do. For this reason, since the inner pipe 14 and the packing 24 are fluid-tightly held without a gap being formed, the internal fluid does not flow out of the fluid transport pipe 12.

Further, the sleeve 32 made of the shape memory alloy is set so as to return to the memorized shape in the use atmosphere of the fluid transport pipe 12. For example, when the fluid transport pipe 12 is installed in a cold region such as the North Sea oil field, the temperature of seawater is about -5 ° C to 15 ° C, so the storage shape is -5 ° C, which is the lowest temperature in the use atmosphere. Set to return to a perfect circle. In this case, the shape memory alloy that is the material of the sleeve 32 returns to the memorized shape when the temperature rises. Therefore, when the sleeve 32 is assembled to the terminal fitting 10, the temperature is lowered by dry ice or the like and the temperature is lower than -5 ° C. Work in a low atmosphere. As a result, when the fluid transport pipe 12 is installed in the sea, which is the working atmosphere after the assembly work is completed, the temperature rises more than that at the time of the assembly manufacturing, so that the sleeve 32 returns to the memory-shaped perfect circle, and thus the fluid transport is performed. When the pipe 12 is placed in the use atmosphere, the sleeve 32 constantly presses the packing 24 to prevent the inflow of the external fluid.

Next, another embodiment of the terminal fitting 10 of the present invention will be described with reference to FIGS. 5 and 6. In this embodiment, the shape memory alloy sleeve 32 is provided outside the inner pipe 14. It is formed in a ring shape to be fitted on the circumference and is arranged between the inner pipe 14 and the packing 24. As shown in FIGS. 5 and 6, the packing 24 is provided in the central portion so as to extend in the circumferential direction. It has a packing pressing portion 32A for pressing. In this case, as shown in FIG. 6, the memory shape of the sleeve 32 is a mountain-shaped cross section in which both ends 32B of the ring-shaped sleeve 32 contract in the inner diameter direction and push up the packing pressing protrusion 32A upward. Set to. Therefore, as shown in FIG. 5, the sleeve 32 has an inverted T-shaped cross section when the fluid transport pipe 12 is placed in a temperature lower than the atmosphere in which it is used, such as when the sleeve 32 is assembled to the terminal fitting 10. Since it has a shape, the inner pipe 14 can be easily covered when assembled. On the other hand, when the sleeve 32 is placed in the atmosphere in which the fluid transport pipe 12 is used, the temperature rises, and the sleeve 32 returns to a memory shape having a chevron cross-section as shown in FIG. When the inner pipe 14 is pressed, the packing pressing protrusion 32A rises and presses the packing 24, and the packing 24 is constantly given an elastic force. Therefore, even if the inner pipe 14 has a dimensional variation or the elastic force of the packing 24 is reduced, the fluid tightness can be maintained as long as the fluid transport pipe 12 is in the working atmosphere. It is possible to prevent the internal fluid from flowing out.

[0017]

[Effect of device]

 According to the present invention, as described above, since the shape memory alloy sleeve is provided at the exposed end portion of the inner pipe, it is possible to prevent variations in the inner pipe size or a decrease in the elastic force of the packing. Even if there is, the sleeve comes into contact with the packing by returning to the memory shape, so that fluid tightness can be easily maintained and the outflow of the internal fluid can be sufficiently prevented.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a fluid transportation pipe provided with a terminal fitting of the present invention.

FIG. 2 is a schematic sectional view of a terminal fitting of the present invention.

FIG. 3 is a partial cross-sectional view of the terminal fitting of the present invention.

FIG. 4 is a cross-sectional view showing a state where a sleeve made of a shape memory alloy used in the present invention is attached to an inner pipe.

FIG. 5 is a schematic cross-sectional view showing how a sleeve used in another embodiment of the present invention is attached to an inner pipe.

FIG. 6 is a schematic cross-sectional view showing a state in which a sleeve used in another embodiment of the present invention has returned to a memory shape.

FIG. 7 is a schematic cross-sectional view of a conventional terminal fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Terminal fitting 12 Fluid transport pipe 14 Inner pipe 14A Inner pipe exposed end 24 Packing 26 Terminal fitting main body 28 Press fitting 30 Push bolt 32 Sleeve made of shape memory alloy

Claims (1)

[Scope of utility model registration request] 1. A terminal fitting body which is fluid-tightly fitted to an exposed end portion of an inner pipe of a fluid transport pipe via a packing, and a pressing fitting which is attached to an end portion of the terminal fitting body and presses the packing. And a sleeve made of a shape memory alloy disposed between the inner pipe and the packing and covering the exposed end portion of the inner pipe, wherein the sleeve is the fluid. A terminal fitting for a fluid transport pipe, which is set so as to return to a memorized shape in the use atmosphere of the transport pipe to press the packing.