JPS605202Y2 - Heat exchanger tube support device in boiler - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchanger tube support device in a boiler, and particularly to a support device for suspending and supporting heat exchanger tubes.

Generally, a large number of heat transfer tubes are appropriately installed in a boiler to circulate boiler water, and the boiler water is evaporated using the amount of heat from the combustion gas in the furnace, sent to the boiler drum, and extracted as steam. It is configured so that it can be done.

The schematic configuration of such a boiler is shown in FIG.
The steel support column 3 for the entire boiler is erected above, and the support beam 3 is supported at the upper end.
A group of heat exchanger tubes 5 and 6 degrees that constitute the boiler wall through , 8
．． 9. 10 is suspended and supported.

A large number of convection evaporation tube groups 11, 12, etc. are provided within these heat transfer tube groups 5, 6, 7, 8, 9, and 10.

In addition, among the heat exchanger tube groups 5, 6, 7, 8, 9, 10 described above, there is a tube between the upper heat exchanger tube group 8 located above and the lower heat exchanger tube group 9, 10 located below. As shown in FIG. 2, hanging rods 14 and 15 are interposed to suspend and support the lower heat exchanger tube groups 9 and 10 at desired positions within the boiler.

Reference numerals 16a and 16b; 17at and 17b in the figure are fasteners that rotatably support both ends of the hanging rods 14 and 15, and the details of the connecting portion are shown in FIG. 3, and 18 in the figure is a rotation shaft. This is the pin.

By the way, in the boiler adopting the above-mentioned hanging structure, there is a problem that the lower heat exchanger tube group 9,
The hanging rods 14, 15 that suspend and support the tubes 10 are normally exposed to hot or cold gas, and are at a different temperature than the heat exchanger tube groups 5, 6, 7, 8, 9, 10 in the boiler. That's true.

Such a temperature difference is caused by the length of the hanging rods 14, 15 and the heat exchanger tube groups 8;
This causes a relative displacement in relation to the length of the interval between the heat exchanger tubes 8; This resulted in drawbacks such as being harmful.

That is, even if the initial length of the hanging rods 14, 15 and the initial interval length between the upper and lower heat exchanger tube groups 8; The degree of expansion and contraction was different, leading to the above-mentioned problems.

This invention was made in view of these circumstances,
An extension of a connecting lever that rotatably supports the first and second links relative to the upper and lower heat exchanger tubes, and connects the other ends of these links at a predetermined interval while being rotatably supported. The simple structure of providing a weight at the installed end to balance the relative angular displacement of both links ensures a constant supporting force regardless of the temperature difference between the suspended section in the boiler and the heat transfer tube. To provide a heat exchanger tube support device for a boiler that can support the heat exchanger tubes without applying excessive force to the heat exchanger tubes.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

Figure 4 shows an embodiment of the boiler heat exchanger tube support device according to the present invention, and in the figure, the same or corresponding parts as in Figures 1 to 3 are designated by the same numbers. Explanation will be omitted.

Now, according to the present invention, instead of the conventional hanging rod, a first link 20 whose upper end is rotatably supported on the upper heat exchanger tube group 8 side, and a lower heat exchanger tube group 9, 10 (10 is shown in the figure) are used. a second link 21 whose lower end is rotatably supported on the (not shown) side, and a state in which the lower end of the first link 20 and the upper end of the second link 21 are rotatably supported at predetermined intervals. and a connecting lever 22 that connects both links 20.21. It is characterized by the provision of a weight 24 that absorbs and balances the relative angular displacement of the links 20, 21.

Elaborating this, the first and second links 20.21
extend in substantially the same straight direction from the upper and lower heat exchanger tube groups 8 and 9, respectively, and extend in a direction perpendicular thereto, and are supported in line at predetermined distances apart on the connecting lever 22. .

The connecting lever 22 also has a weight 2 having a predetermined weight at an extending end 22a extending from the base thereof at a predetermined angle.
It is equipped with 4.

Here, the weight of the weight 24 is determined by the distance L□ between the support portion of the first link 20 on the connection lever 22 and the weight 24.
, if the distance between the support portions of both links 20°21 is L2, then Ll/L2×(required supporting force).

Further, the extending end 2 of the connecting lever 22 provided with the weight 24
The inclination angle of 2a with the horizontal plane is the same as that of both links 2 mentioned above.
It is determined by the relationship between the elongation of 0 and 21 and the interval between the upper and lower heat exchanger tube groups 8; 9 and 10.

That is, when the elongation of both links 20 and 21 is smaller than the interval between the upper and lower heat exchanger tube groups 8; Conversely, if the elongation of both links 20 and 21 is greater than the distance between the upper and lower heat exchanger tube groups 8; It has been confirmed through experiments that the weight 24 may be provided upwardly at an inclination angle of about 30 to 60 degrees.

This is because, like the former, the growth of both links is 20.21,
When the distance between the lower heat exchanger tube group 8; 9 and 10 is smaller, L□ increases as the relative elongation of both links 20 and 21 decreases, and as a result, its supporting force gradually increases. On the other hand, as in the latter case, the elongation of both links 20 and 21 increases as the upper and lower heat exchanger tube groups 8
;If the interval is larger than the interval between 9 and 10, both links 20
．． As the relative elongation of 21 increases, the upwardly inclined weight 24 descends, thereby increasing L, and as a result, the supporting force gradually increases and becomes balanced. It should be obvious.

Therefore, according to such a configuration, regardless of the difference in the amount of expansion and contraction due to the temperature difference between the hanging part and the heat exchanger tube group 8; 9, 10, it is possible to maintain a substantially constant supporting force and to balance This makes it possible to provide an excellent support device as a means for suspending heat exchanger tubes within a boiler.

However, the present invention is not limited to the structure of the embodiment described above, and the shape and structure of each part may be modified or changed as appropriate. The amount of inclination in the upward and downward directions is appropriately selected depending on the required supporting force.

As explained above, according to the heat exchanger tube support device for a boiler according to the present invention, a pair of links are rotatably supported on the upper and lower heat exchanger tubes, and both links are rotated at a predetermined interval. Since a weight is provided at the extending end of the connecting lever that is movably supported to balance the relative angular displacement of both links, the structure is simple and inexpensive. It absorbs the expansion/contraction difference due to the temperature difference between the hanging part and the heat transfer tube part, eliminates the problem of excessive force being applied to the heat transfer tube side, and allows the heat transfer tube to always be supported with a constant support force. It has excellent effects.

[Brief Description of the Drawings] Figure 1 is a schematic side view of a boiler showing an example of a conventional support device, Figures 2 and 3 are enlarged views of its main parts, and Figure 4 is a boiler heat exchanger tube according to the present invention. FIG. 2 is an enlarged view of essential parts of an embodiment of a support device. 1...Boiler steel support column, 3...Support beam, 4...Hanging rod, 5.6.7.8.9.
10... Heat exchanger tube group, 16a=16b;
17a, 11b"" stopper, 18...Zen, 2
0...First link, 21...Second link, 22...Connection lever 22a...
... Its extended end, 23 ... Hanging means, 24
... Weight.

Claims (1)

[Scope of utility model registration request] A support device that is interposed between upper and lower heat exchanger tubes in a boiler and suspends and supports the lower heat exchanger tube, comprising: a first link whose upper end is rotatably supported on the upper heat exchanger tube side; and the lower heat exchanger tube. a second link whose lower end is rotatably supported on the side;
A connecting lever is provided which connects both links by rotatably supporting the lower end of the first link and the upper end of the second link at a predetermined interval, and this connecting lever has one end extending laterally. and a weight is provided at the extending end thereof to balance the relative angular displacement of the first and second links due to the temperature difference between the upper and lower heat exchanger tubes and the suspended portion. Features: Heat transfer tube support device in boiler.