JPS6013193Y2 - conductive flexible joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conductive flexible joint used in an electric heater or the like to connect a heating element and a conductor, or a body to be connected, such as between heating elements.

In heaters, etc., a conductor is sometimes connected to a heating element fixed to a tube plate, etc., but if the conductor is displaced due to thermal expansion, buckling stress on the conductor, etc. Bending stress occurs in the fixed part.

If these stresses exceed the allowable stress of the conductor and the heat generating element, it will have an adverse effect on the conductor and the heat generating element, so it is necessary to alleviate the generated stress.

Furthermore, when connecting multiple heating elements in a U-shape in a heater, etc., if one end of each is fixed to a tube plate, the other ends are connected to each other, but each heating element has an electrical resistance value of , differences in elongation may occur due to non-uniformity of cross-sectional shape, etc.

If one end of the heating element is fixed, it is necessary to absorb the stress generated by the above-mentioned difference in elongation at the other end.

As a conventional joint, for example, as shown in Fig. 1, a flexible joint is formed by laminating and forming metal foil at right angles to the joint between the end of the heating element a and the end of the conductor. There is a foil-curved method in which a flexible body C is interposed and both ends of the flexible body C are fixed to a heating element a and a conductor.

However, in this method, the laminated flexible body C of metal foil bent at right angles tends to return to a straight line due to springback, etc., and this may have an adverse effect on the heating element a, the conductor, etc. There is.

Conventionally, as shown in Fig. 2, a plain braided wire d made of copper wire is bent at right angles and interposed between the heating element a and the conductor, and both ends are connected to the heating element a and the conductor. There is also a flat braided wire type that is fixed to the wire.

However, in this method, since copper wire is used for the plain braided wire d, there is a problem that it cannot be used at high temperatures, and it is necessary to change the material of the plain braided wire d, which is generally marketable, to a heat-resistant one. For example, there is a problem of high cost when using small quantities.

The present invention eliminates the above-mentioned problems, and can also be used not only to connect a heating element and a conductor in a heater, etc., but also to connect parts of heating elements to each other, and to prevent displacement due to thermal expansion of the heating element, etc. This was created in an attempt to absorb the metal foil, and two or more metal foil laminated flexible bodies made by laminating thin flat metal foils are connected to each other in a right angle direction via a right angle connecting fitting. The present invention is characterized in that the members to be connected are connected to each other by a conductor joint.

Hereinafter, embodiments of the present invention will be described based on the drawings. The joint of the present invention uses a metal foil laminated flexible body 1 in which flat metal foils are laminated.

FIG. 3 shows an embodiment of the present invention, in which a metal foil laminated flexible body 1, a right angle connecting fitting 2 for connecting two sets of the metal foil laminated flexible bodies 1 at right angles, and a heating element. It uses metal fittings to attach objects to be connected, such as a plurality of metal foil laminated flexible bodies 1.
A conductor joint is formed by fixing each end of each metal foil laminated flexible body 1 to a right-angled connecting fitting 2 and connecting each metal foil laminated flexible body 1 at right angles, and one metal foil laminated flexible body 1 is connected to a heating element mounting bracket 3. The other end of the metal foil laminated flexible body 1 is fixed to the conductor connecting fitting 4, respectively, to connect the heating element and the conductor.

The metal foil laminated flexible body 1 is made by laminating a large number of metal foils 5 having a sufficient length to maintain necessary flexibility so as to maintain a cross-sectional area necessary for passing current, etc., The metal foil has sufficient flexibility as a whole, and the right angle connection fitting 2 has a concave groove 6 for receiving and holding the metal foil laminated flexible body 1. A flexible body holding fitting 7 is provided in a direction of 90 degrees, and when the end of the flexible body 1 is inserted along the groove 6, the flexible body 1 is pressed and fixed from a direction perpendicular to the insertion direction. It has.

Further, the heating element mounting fitting 3 and the conductor connecting fitting 4 are also provided with grooves 8 for receiving and holding the ends of the metal foil laminated flexible body 1, and a flexible body presser similar to the above-mentioned presser fitting 7 is provided. A metal fitting 9 is prepared.

Note that 10 indicates a hole for attaching a heating element, and 11 indicates a hole for connecting a conductor.

Now, when connecting the heating element and the conductor, insert one end of one metal foil laminated flexible body 1 into one groove 6 of the right-angled connection fitting 2 and press it with the flexible body holding fitting 7. Insert one end of another metal foil laminated flexible body 1 into the other concave groove 6 of the right-angled connection fitting 2 and similarly press and fix with the flexible body holding fittings 7. Each holding fitting 7 is It is fixed to the right angle connecting fitting 2 by welding or the like.

As a result, the two sets of metal foil laminated flexible bodies 1 are connected in the right angle direction by the right angle connecting fittings 2, and constitute a conductor joint.

Further, the laminated metal foils 5 constituting the metal foil laminated flexible body 1' are kept in a laminated state without being separated by the above-mentioned fixing, and each metal foil 5 is sufficiently thin in the thickness direction. Because it has sufficient flexibility, even when it is laminated and integrated to the cross-sectional area necessary for passing current, etc., it has sufficient flexibility than a connecting plate made of a single sheet of the same thickness.

Next, the heating element mounting bracket 3 and the conductor connecting bracket 4 are attached to each other end of the metal foil laminated flexible body 1 of the conductor joint which is integrated and has sufficient flexibility, and the flexible body holding bracket is attached. 9, and then interpose them all together between each end of the heating element and the conductor, which are the members to be connected, and connect the end of the heating element to the heating element mounting bracket 3 and to the conductor connecting bracket 4. Attach the ends of each conductor to connect the heating element and the conductor.

When the heating element and the conductor are connected using the joint of this invention,
Even if the conductor fixed to the tube sheet is displaced due to thermal expansion, etc., resulting in a shift in the relative position between the end of the heating element and the end of the conductor, it is possible to laminate metal foils connected at right angles. The flexibility of the flexible body 1 can absorb this displacement of the heating element, and the bending stress of the heating element and the compressive stress of the conductor at the tube plate mounting portion can be alleviated.

Further, at this time, there is no tendency for the right-angled structure to return to a straight line, as in the conventional foil curved type.

4 to 6 show a conventional general method for connecting the other ends of the parallel heating elements 13, each of which has one end fixed to the tube sheet 12, and is a simple laminated plate-like method. They are connected by a flexible body C.

However, in the case of the above conventional method, when the mutual spacing between the heating elements 13 and 13 is small and the difference in expansion is large, the fifth
As is clear from the figure, there is a problem in that when the laminated flexible body C is bent, the heating elements 13 and 13 are pulled together in the direction of the arrow, resulting in a bending moment.

For this reason, it is conceivable to connect the laminated flexible body C by bending it into a U-shape, but in such a case there is a problem of springback.

FIGS. 7 and 8 show an example of the structure of the present invention that can solve the above problems, in which three sets of metal foil laminated flexible bodies 1 are used and two right-angled connecting fittings 2 are used to form a U-shape. The heating elements are connected to each other.

That is, as shown in FIG. 4, the heating elements 13 and 13 whose one ends are fixed to the tube plate 12 are connected by two right-angled connecting fittings 2 and three sets of metal foil laminated flexible bodies 1. are assembled into a U-shape as shown in the figure, and the heating element mounting brackets 3 are respectively attached to the free ends of the two sets of metal foil laminated flexible bodies 1. heating element 13
．． 13 to connect the heating elements.

In this way, the stress generated due to the difference in elongation of the heating element 13 can be alleviated by the flexibility of the metal foil laminated flexible body 1.

Since the joint of the present invention has the configuration and function as described above, (i) the metal foil laminated flexible body is laminated with metal foils having sufficiently large flexibility, so that it has a sufficient disconnection to allow current, etc. to flow. In addition to being able to secure a large area, the connecting plate has sufficiently greater flexibility than a single-piece connecting plate of the same thickness, and can sufficiently absorb thermal deformation of a heating element or the like.

([1] When assembling in a right-angled shape, two or more sets of metal foil laminated flexible bodies 1 are arranged in a right-angled direction using right-angled connecting fittings, so there is no tendency for the body to deform from a right-angled state into a straight line. Therefore, there is no adverse effect on the heating element, etc., and the function as a flexible body can be fully exhibited.

Even when used to connect heating elements, it can freely absorb the difference in expansion of the heating elements and does not cause excessive stress on the heating elements.

■ Easily select materials for connecting plate structural members that are suitable for the operating temperature.

Demonstrates excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional foil-curved type joint, Fig. 2 is an explanatory diagram of a conventional flat-braided type joint, and Fig. 3 is a perspective view showing an embodiment of the joint of the present invention. Figure 4 is an explanatory diagram showing a conventional general example of connecting parallel heating elements, and Figure 5 is an explanatory diagram showing a conventional general example of connecting parallel heating elements.
Figure 6 is an enlarged view of the V part in the figure, Figure 6 is a view in the direction of the ■ arrow in Figure 5, Figure 7 is another embodiment in which the joint of the present invention is applied to the connection of heating elements, and Figure 8 is the FIG. 3 is an enlarged perspective view of the figure. 1...Metal foil laminated flexible body, 2...Right angle connection fitting, 3...Heating element mounting fitting, 4...
・・Conductor connection fitting, 5・・Metal foil, 7, 9・
...Flexible presser fitting.

Claims (1)

[Scope of utility model registration request] Two or more metal foil laminated flexible bodies formed by laminating thin flat metal foils are connected to each other in a right angle direction via a right angle connecting fitting to connect the connected materials. A conductive flexible joint characterized by: