JPH0640573U - Expansion joint - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to provide a pipe joint that induces the extension of a pipe by a shape memory alloy that reacts faster than the extension of the pipe at high temperature. [Structure] The present invention has a mechanism for contracting the bellows pipe 2 of the expansion pipe joint body 1 by the expansion / contraction induction part 5 made of a shape memory alloy that reacts faster than the expansion of the pipe 6 at high temperature. is there.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an expansion pipe joint installed in a steam pipe or the like.

[0002]

[Prior art]

 As a pipe for circulating high-temperature steam or a high-temperature liquid, a bellows-shaped expandable pipe joint b is connected to the middle of the pipe a as shown in FIG. Both ends of are fixed. That is, the expansion of the pipe a due to high temperature is absorbed by the expandable and contractible pipe joint b to prevent accidents due to breakage of the pipe a.

[0003]

[Problems to be solved by the device]

 However, in the above case, it is necessary to firmly fix both sides of the pipe a in order to expand and contract the pipe a in the direction of the pipe joint b or in the opposite direction, which is very time-consuming and the cost of the piping work. There is a problem that causes a high. Therefore, in order to solve the above problems, it is an object of the present invention to provide a pipe joint that induces the extension of the pipe by a shape memory alloy that reacts faster than the expansion and contraction of the pipe.

[0004]

[Means for Solving the Problems]

 The above object of the present invention can be achieved by an expansion pipe joint having the following configuration. In other words, the gist of this is an expansion joint made of a shape memory alloy that reacts faster and weaker than the elongation of a pipe at high temperature in an expansion joint that is placed in the middle of the pipe such as a steam pipe at high temperature. The expansion joint is characterized by having a mechanism such that the expansion joint is contracted by the guide portion.

[0005]

[Action]

 In the present invention, as shown in FIG. 2, the pipes 6, 6 are connected to the pipe connecting flanges 3, 3 on both sides of the expansion pipe joint body 1, and when the temperature is high, the pipe 6 is extended more than the pipe 6 is extended. Since the elongation reaction of the contraction-inducing portions 5 and 5 is weak, the bellows tube 2 is contracted while the tubes 6 and 6 on both sides are pulled. Therefore, the pedestals 7 and 7 on both sides of the tubes 6 and 6 are The reaction due to the extension of 6 will not be received.

[0006]

【Example】

 Hereinafter, the expansion joint according to the present invention will be described in detail with reference to the drawings showing an embodiment thereof. FIG. 1 is a sectional view of the present invention. The expansion joint main body 1 is such that expandable bellows pipes 2 are provided at both ends with pipe connecting flanges 3 and 3, and are guided between the pipe connecting flanges 3 and 3. The rods 4 and 4 are inserted loosely. Therefore, the bellows tube 2 is a mechanism that can expand and contract along the guide rods 3, 3. Therefore, a mechanism is provided between the flanges 3 and 3 for connecting the pipes, to which the expansion-inducing portions 5 and 5 made of a shape memory alloy, which show an expansion and contraction reaction faster than the expansion of the pipes by heat, are connected. The expansion / contraction mechanism of the expansion / contraction pipe main body 1 has various expansion / contraction mechanisms in addition to the bellows type, and the expansion / contraction induction unit 5 is installed in such a state that the expansion / contraction pipe joint is contracted faster than the expansion of the pipe. It is desirable to do.

[0007]

[Effect of device]

 As described above, according to the present invention, it is not necessary to firmly fix the expansion joint to the pedestal that supports both sides of the pipe by shrinking the expansion joint by the shape memory alloy faster than the expansion of the pipe. It has the effect of reducing the cost and cost of piping work.

[0008]

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the present invention.

FIG. 3 is an explanatory view of a conventional pipe.

[Explanation of symbols]

 1 Expansion pipe joint body 2 Bellows pipe 3 Flange for pipe connection 4 Guide rod 5 Expansion / contraction induction part 6 Pipe 7 Stand

Claims (1)

[Scope of utility model registration request] 1. An expansion joint made of a shape memory alloy that reacts faster than the elongation of a pipe at high temperature in an expansion joint which is arranged in the middle of the pipe at high temperature such as a steam pipe. An expansion joint according to claim 1, wherein the expansion joint is contracted by a guide portion.