JPS6319758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat insulating mechanism for piping that transfers high-temperature or low-temperature fluids.

Conventionally, it has been necessary to adopt a certain insulation mechanism for piping for transporting high-temperature fluid, which is generally covered with a heat insulating material such as calcium silicate, urethane foam, or polystyrene foam. However, in cases where a particularly high degree of insulation is required, vacuum insulation methods, including vacuum powder non-insulation methods and vacuum multi-layer insulation methods, are adopted, and in this case, the inner and outer tubes are separated. A double tube structure is used. However, in any of these cases, it is necessary to support the piping, and even in the case of the double-pipe structure used for the vacuum insulation method, supporting members such as spacers or other supports are provided between the inner and outer pipes. is necessary. That is, FIG. 1 shows an outline of such conventional cryogenic fluid transport piping with a double-tube structure. At present, the heat transfer loss from these parts is quite large. In other words, when a cryogenic fluid as described above flows in the inner pipe 1 connected by an expansion joint 6 such as a bellows, if the electric heat loss at the fixed support portion 3 and spacer 5 is large, the outer pipe 2 It is a well-known phenomenon that the temperature of this part becomes 0° C. or less and a frozen part 9 occurs, and this is due to cold heat dissipation as shown by arrow 8. The inner tube 1 is covered with a heat insulating layer 4, and an outer shell layer 2a is appropriately formed to form a support 7.
As shown in FIG. 2, even when the anchor is supported by the anchor, ice 9 is generated on the anchor support portion. Fig. 3 shows a specific cooling and heat dissipation state in Fig. 1, but the amount of heat transferred from the conventional support portion 3 and spacer 5 portion, which have a relatively wide contact area with the inner tube, is small. When the temperature difference between the inside of the tube 1 and the outside of the outer tube 2 becomes large, it increases at an accelerated rate,
The long-awaited vacuum insulation technology had many problems, including a significant reduction in its effectiveness.

The present invention was created after repeated studies in view of the above-mentioned circumstances, and relates to the creation of a heat insulating support mechanism for piping, which minimizes heat transfer loss in the support portion of piping for transporting high-temperature fluids. Moreover, it is an object of the present invention to provide a mechanism capable of forming a stable support relationship.

That is, in the present invention, a ring is interposed inside the outer tube via a support member, and a plurality of hanging pieces are arranged inside the ring, and a hanging piece is provided at both ends in the tube axis direction. The heat-insulating support mechanism is characterized by suspending the inner tube, to which the sleeve has been welded in advance, at multiple points between these pieces with steel wires tilted in the tube axis direction. There is no need to protrude from the inner tube, and there is no need to provide a suspension mechanism for the inner tube directly on the outer tube.Since the hanging piece is protruded from inside the ring provided via the support member, it is possible to avoid high heat or Cold heat is now transferred to the outside indirectly through low thermal conductivity.

A high-strength steel wire is used for the suspension, and the inner tube is pre-welded with a suspension piece inside the ring and a sleeve with suspension pieces placed at each end in the tube axis direction. Since it is suspended at multiple points tilted in the axial direction, it has an excellent heat insulation effect, and provides a support structure that is suitable for the internal pipe's rigid stress, rotational moment, thrust, etc., and strengthens the stability of the pipe support mechanism. Ta.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a longitudinal sectional view showing an embodiment of the present invention as a spacer, in which a hanging piece 11 is provided on a sleeve 10 welded to an inner tube 1.
and hanging pieces 11, 11a protruding from the ring 13 inserted into the outer tube 2 via the support member 14.
A steel wire 12 is stretched between the inner tube 1 and the inner tube 1 is suspended at multiple points in a hanging structure that is inclined in the tube axis direction between both hanging pieces. Figure 5 is a cross-sectional view of the same suspension mechanism as in Figure 4, but unlike the previous figure, it shows an example in which the stretched steel wires 12 are doubled (4 in total). . Whether to use a single layer or a double layer can be appropriately selected depending on the weight of the inner tube containing the fluid, the temperature conditions of the fluid, etc. As the support member 14, a member having appropriate heat insulation properties was used.

As explained above, in the case of the present invention, a ring is interposed inside the outer tube via a support member having suitable heat insulation, and a hanging piece inside the ring and a sleeve welded to the inner tube are provided. The mechanism is such that the inner tube is suspended at multiple points using steel wires tilted in the tube axis direction between the hanging pieces at both ends of the tube.
There is no need to protrude a supporting part on the inside of the outer pipe, so construction is easier, and the inner pipe is suspended from the ring at multiple points with steel wires in addition to the support member, which is different from the conventional method. Compared to the heat insulating support mechanism, high heat or cold heat is transmitted indirectly to the outer tube through steel wires with an extremely small cross-sectional area, which not only provides superior insulation but also reduces irregular stress on the inner tube. Since a support structure suitable for , rotational moment, thrust, etc. has been obtained, and the structure is symmetrical and reasonable, it can be used stably and safely for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional double pipe support structure, Fig. 2 is a partially cutaway side view of a conventional heat insulating cladding pipe, and Fig. 3 is a spacer portion shown in Fig. 1. 4 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 5 is a cross-sectional view of a structure in which steel wires are doubled using the same mechanism as the embodiment of FIG. 4. 1: Inner tube, 2: Outer tube, 10: Sleeve, 11,
11a: Hanging piece, 12: Steel wire, 13: Ring, 14: Support member.

Claims (1)

[Claims] 1 A ring is interposed inside the outer tube via a support member, and a plurality of hanging pieces are placed inside the ring, and a sleeve is placed in advance with hanging pieces placed at both ends in the tube axis direction. A heat insulation support mechanism for piping, characterized in that a welded inner pipe is suspended at multiple points between these pieces by steel wires inclined in the pipe axis direction.