JPS61140689A - Piping support structure - 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 [Field of Application of the Invention] The present invention provides a piping system which has a spring element using a shape memory element and is highly effective in supporting the weight of a piping system that undergoes large vertical heat transfer. Regarding support structures.

[Background of the invention]

Support structures that support the weight of piping where vertical heat transfer occurs must satisfy the following conditions: 1)
2) Do not restrict the heat transfer of the piping, and 2) Support its own weight firmly. A structure called a "constant hanger" satisfies this condition. Most of these ``constant hangers'' are a combination of coil springs and link mechanisms, and are designed to maintain a constant load at all times, and do not restrict the movement of piping.

However, 1) since the supporting load is constant, strict load calculation is required. 2) High cost. For these reasons, ``spring hangers,'' which are support devices consisting only of springs, are currently in widespread use. The advantages of this "spring hanger" are: 1) Since the load support range is large, it is easy to perfectly balance the actual weight. 2) Low cost. 3) It can support the load and act as a vibration isolator to prevent vibration of the pipe system by applying an appropriate compressive or tensile load to the pipe system. etc.

However, the "spring hanger" has a limit in the movement range of the spring (hereinafter referred to as travel), and cannot be applied to locations where piping moves relatively large.

Based on this unique background, the present invention has developed a pipe support structure that utilizes shape memory elements as springs in order to make it possible to increase the travel frame. J
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[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a piping support structure having a large travel spring using a shape memory element.

[Summary of the invention]

A feature of the present invention is that shape memory confectionery is used as the material for the spring.

The term "shape memory element" here refers to a material that undergoes transformation with changes in temperature; for example, in the case of N i -'l' i alloy, after being molded into a predetermined shape, it is If you fix it and hold it at 400t:'~500C for about 30 minutes at a time, it will remember its shape when you heat it, and no matter how many times you deform it, it will return to its original shape just by heating it. There is.

By using this L-shaped material to memorize the shape of the spring, it is possible to obtain a stroke several times the free length of the spring as the temperature changes, making it possible to greatly expand the limits on the use of conventional spring hangers. , It is possible to minimize the variation in load with respect to the size of the stroke.

[Embodiments of the invention]

FIG. 1 shows a comparison of the characteristics of a conventional spring hanger and a pipe support structure using a shape memory element according to the present invention.

With conventional spring hangers, the λ point (piping installation state)
When the pipe moves upward due to thermal displacement, rounding occurs below point B, where the load is 0 and e. To support the pipe's own weight, limit the range where the load is e. had to use it. Also, as can be seen from its characteristics, it was characterized by large fluctuations in load.

In the present invention, by using a shape memory element in the spring coil, the ability to follow the movement of the piping is improved, and it is possible to reduce the load /R excitation t - as much as possible.

Next, the % required performance required for the shape memory element actually used will be described.

Regarding shape memory elements, there are differences in performance depending on their composition and heat treatment conditions, but the performance required by the present invention is that stable operation with small hysteresis exists over a wide load range. is necessary. Figure 2 shows its general characteristics.It is desirable that the load from load a to load c (a(c)) be stable with small hysteresis.Furthermore, as shown in Figure 3, it is desirable that the pipe deforms in the operating temperature range. It's ideal.

An example in which this unique shape memory element is applied to an actual pipe as a support structure is shown in FIGS. 4 and 5.

FIG. 4 shows the installation state when the thermal displacement of the piping is upward. A band 2 is fixed to the pipe 1, and the pipe 1 is connected to a clevis 4 and a shape memory element 3 via the band 2t.
is suspended by.

FIG. 45 shows a state in which the plant has started operating and the piping itself is displaced upward.

At this time, as the temperature of the pipe rises, the heat is transferred to the shape memory cord 3, and the shape memory element 3 returns to its original shape (coiled shape) K, supporting the weight of the pipe =9 due to the force of the spring. That's it.

Contrary to this case, when the thermal displacement of the piping is downward, if the shape memory cord 3 is memorized in the shape shown in Fig. 7, the shape at the time of installation shown in Fig. 6 will be changed during plant operation. In some cases, it will return to the L position in Figure G7.

In either of these cases, by adjusting the number of turns of the coil, its length, etc., t-m, it is possible to obtain the effect of maximizing the stroke and minimizing the load change 'wb.

〔Effect of the invention〕

According to the present invention, the shapes t and 11ac are adopted.

Compared to conventional spring hangers, a support structure with a simple structure that has a large stroke and extremely little variation in load can be obtained.

[Brief explanation of drawings]

Figure 5g1 is a comparison diagram of the conventional spring hanger and the embodiment of the present invention. Figure 2 is a relationship diagram between the hysteresis curve of the shape memory element and load. Figure 3 is a characteristic diagram of the shape memory element @ degree and deformation. Figure 4 The figure shows the installation state of the piping support structure of the present invention in the case where upward piping displacement occurs. The fifth factor is the installation state diagram during plant operation. FIG. 7 is a diagram showing the installation state when the piping support structure is installed, and FIG. 7 is a diagram showing the installation state during plant operation. 1...Piping, 2...Band, 3...Shape memory element, 4...'K1 mouth ￥2 figure 5 Hoshihiko73 figure Temperature￥L/- figure 50 Y6 figure Figure 7

Claims (1)

[Claims] 1. Among the piping support structures of the plant, as structures that support the weight of the parts where the amount of heat transfer in the vertical direction of the piping is large,
A pipe support structure that utilizes a shape memory element and consists of a spring coil that maintains load balance and a shape memory element that absorbs the amount of pipe movement caused by temperature changes.