JPS60201184A - Double pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small-diameter double pipe used for lubricating, for example, the bearings of a generator.

[Conventional technology]

Figure 1 shows a conventional example of this type of double pipe.
1) is the drain guard pipe, (2) is the oil supply pipe, and (3) is the drain guard pipe (passes through the drain guard pipe (1) horizontally and at right angles to the longitudinal direction of 11, and extends from the bottom of the oil supply pipe (2). The drain guard pipe (11) is a round bar supported in the right angle direction, and is configured as shown above.The drain guard pipe (11) protects the oil supply pipe (2) from being damaged from the outside, and also protects the oil supply pipe (2) from leaking. The oil is collected and prevented from leaking outside.

By the way, in the conventional type configured as above 9, it is difficult to fix the oil supply pipe (2) to the horizontal round bar (3), and because fixing is omitted, the equipment installed around 9 The disadvantage is that the oil supply pipe (2) also vibrates due to the vibration caused by the operation of the engine, producing abnormal noise.In the event of an earthquake, the oil supply pipe (2) is thick (there is a risk of it vibrating and breaking). .Also,
The round rod (3) had to pass through the drain guard pipe (1) horizontally and was fixed by welding, which had the disadvantage of poor workability.

[Summary of the invention]

The present invention is aimed at overcoming one or more of the drawbacks of the prior art, and uses a shape memory alloy as a support member that connects an outer tube and an inner tube, and uses the shape memory alloy's deformation restoring force to A double tube is provided in which an inner tube is fixed to the inner circumference of an outer tube.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In the figure, the same reference numerals as in Figure 1 indicate the same or equivalent parts, and (4) is fixed to the outer circumference of the oil supply pipe (2) by welding, and the outer diameter is smaller than the inner diameter Do of the drain guard pipe (1). This is a support member made of a shape memory alloy that has been bent in this way.

As described above, the drain guard pipe (1) is connected to the oil supply pipe (2) to which the supporting member made of shape memory alloy is fixed to the outer periphery.
) and heats the support member (4) by flowing steam or other fluid at a predetermined temperature into the drain guard pipe (1), the support member (4) assumes the shape of the shape memory alloy before deformation. Due to the restoring force, the outer diameter expands and the oil supply pipe (2
) is fixed to the inner periphery of the drain guard pipe (1) via a support member (4) as shown in FIG.

In the above embodiment, the support member (4) is fixed to the outer peripheral portion of the seven oil supply pipes (2) in the axial direction.

As shown in FIG. 4, if a passage (5) through which oil leaking from the oil supply pipe (2) flows in the axial direction can be secured, the oil supply pipe 12
) A similar effect can be obtained by using a rectangular support member 16+ fixed perpendicularly to the support member 16+.

Further, in the above embodiment, the case of a double pipe for refueling has been described, but the present invention is not limited to this, and the present invention can be implemented in the same way with a double pipe for other purposes.

〔Effect of the invention〕

As described above, according to the present invention, a shape memory alloy is used as a support member that connects an outer tube and an inner tube, and the restoring force of the shape memory alloy against deformation is used to attach the inner periphery of the outer tube. Since the internal tube is fixed via the support member, it is easy to assemble the device, and it is also possible to prevent abnormal noise from being generated due to vibrations of peripheral equipment and from breaking the device due to vibrations during earthquakes. 9. A double pipe with excellent workability and reliability can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example, FIGS. 2 and 3 show an embodiment of the present invention, and FIG. 2 is a side view showing an assembled state.
FIG. 3 is a perspective view, and FIG. 4 is a perspective view showing another embodiment of the invention. In the figures, the same reference numerals indicate the same or equivalent parts, (
1) is a drain/guard pipe, (2) is an oil supply pipe, and (4) is a support member. Agent Masuo Oiwa (and 2 others) Figure 1 Figure 2

Claims (1)

[Claims] In the double tube including an inner tube supported by a support member inside the outer tube, the support member is made of a shape memory alloy and is deformed so that its outer diameter is smaller than the inner diameter of the outer tube. The inner tube with the supporting member fixed to its outer circumference is inserted into the outer tube, the supporting member is heated to a predetermined temperature, and the outer diameter of the supporting member is expanded by the restoring force against the deformation of the shape memory alloy. and the inner tube is fixed to the inner circumference of the outer tube via the support member.