JPS61253319A - Structure for attaching radiant tube - Google Patents

Abstract

PURPOSE:To prevent the generation of deformation and crack to a radiant tube by attaching the end on the burner flame delivery side of the radiant tube in such a manner that said end can be slidably attached to the wall of a furnace via bellows. CONSTITUTION:A stepped cylindrical bellow rest 4 is formed to the inside of a base plate 3 of the furnace wall. A sliding side ring 6b and a stationary side ring 6c formed to the rest 4 are connected and the bellows 6 consisting of the hollow bellows part 6a is disposed. The radiant tube 1 is inserted successively through the insertion hole 2b of the ring 8 formed to the rest 4, the insertion hole 2d of the ring 6c and the insertion hole 2c of the sliding side ring 6b. A sliding ring 10 fixed to the end 12 of the tube 1 is then fitted into the sliding hole 2a of a flange 5 and the upper end 12 of the tube 1 is slidably and attachably and detachably attached to the burner side of the plate 3 via a gasket 11. The radiation of hot wind to the outside is prevented by the above- mentioned structure.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to continuous annealing furnaces for cold-rolled steel sheets and tin plates, and various other heat treatment furnaces, heating furnaces, and soaking furnaces. The present invention relates to a radiant tube mounting structure for heating equipment that is applied to the mounting of radiant tubes used in heating equipment such as the present invention.

(Prior Art) A radiant tube mounting structure in a conventional heating equipment will be explained with reference to FIG.

In the figure, 101 is a radiant tube that is approximately W-shaped, and its main body is attached to a furnace wall base 103 having a through hole 102.

More specifically, the furnace wall base 103 has fitting holes 1 into which both end portions of the radiant tube 101 can be fitted.
02, 102 are provided, and the fitting holes 102, 10 in the furnace wall outer surface portion 103a of the furnace wall base 103 are provided.
Twelve joining bolts 107 for joining a heat storage burner (not shown) are installed in a circle along the circumference of each of the openings 2 at equal intervals. Both end portions of the radiant tube 101 are fitted into the fitting holes 102, 102 from the inside of the furnace wall base 103, and then are in a state of slightly protruding from the furnace wall outer surface portion 103a. In addition, a flange ring 113.113 is attached to the radiant tube 101, in which the same number of through holes 113a are formed on the same circumference in accordance with the arrangement of the joining bolts 107, and a hole 113b into which the end of the radiant tube 101 can be fitted.
are fitted to both ends of the holder and fixed by welding from both sides. Furthermore, the flange rings 113, 113 respectively connect the connecting bolts 107, 107 to the through holes 113a, 11.
3a, and the furnace wall outer surface portion 103a of the furnace wall base 103.
It is fixed by welding in close contact with the A heat-resistant member 120 made of ceramic fiber is provided inside the furnace wall base 103 other than the fitting holes 102, 102 formed in the furnace wall base 103.

(Problems to be Solved by the Invention) However, in the conventional radiant tube mounting structure, both end portions of the radiant tube 101 are firmly fixed to the furnace wall outer surface portion 103a of the furnace wall base 103. When thermal strain occurs due to the temperature difference between the high temperature part 2A on the burner side and the low temperature part 2B on the exhaust side in Figure 1,
Since the expansion and contraction cannot be released, large deformation or cracks may occur in the radiant tube 101, or the radiant tube 101 and the furnace wall base 103 may
The attachment part to the furnace wall outer surface 103a may be damaged, and in such a case, there are problems such as the need to repair the auxiliary equipment.

This invention was made in view of the problems with the conventional radiant tube mounting structure explained above.
The object of the present invention is to provide a radiant tube mounting structure that reduces the need for repairs to incidental equipment and enables the reuse of parts.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a mounting structure for a radiant tube that is approximately W-shaped, has both ends attached to the furnace wall, and sends out a burner flame from one end. The present invention is characterized in that at least the burner flame delivery side end of the radiant tube is slidably attached to the furnace wall portion via a bellows.

(Example 1) In Fig. 0, which describes one embodiment of the present invention using Figs. End 12
is attached to the burner side of a heat-resistant furnace wall base 3 that constitutes the furnace wall portion after being attached to heating equipment such as a heating furnace or a soaking furnace. More specifically, the furnace wall base 3 includes a furnace wall outer surface portion 3a having a flange 5 having a sliding hole 2a formed in a circular center portion fixed by a welded portion 5a, and the flange Joint bottles 7 into which the heat storage burners (not shown) are fitted are arranged at equal intervals on the circumference. A bellows portion 4 of the stepped cylinder A is formed inside the furnace wall outer surface portion 3a of the furnace wall base 3, and the radiant tube 1 is fitted into the stepped portion 4a at the center portion without resistance. A fixing ring 8 with a possible fitting hole 2b is attached. Furthermore, a sliding side ring 6 is formed in the bellows portion 4 near its opening with a fitting hole 2c through which the radiant tube 1 can be fitted without any gap.
b, and a fixed side ring 6C having a fitting hole 2d that is slightly larger than the fitting hole 2C near the inner part thereof, and a bellows 6 comprising a hollow bellows part 6a connecting both the rings 6b and 6C. is arranged, and the fixed side ring 6c is welded and fixed to the fixed ring 8,
Furthermore, the sliding side ring 6b is attached to the flange 5.
It is slidably fitted inside a sliding hole 2a formed in the. Then, the radiant tube 1 is inserted into the fitting hole 2b of the fixed ring 8 and the fixed side ring 6 of the bellows 6.
After sequentially fitting the fitting hole 2d of C and the fitting hole 2c of the sliding ring 6b, the end portion 1 of the radiant tube 1
The sliding ring 10 welded and fixed to the bellows 6 can be slidably fitted inside the sliding hole 2a formed in the flange 5, and the sliding ring 10 of the bellows 6 which has been fitted first
b, and the sliding hole 2 by inserting the gasket 11 between them.
They are removably connected by bolts 9 on the inside of a.

As described above, the end portion 12 of the radiant tube 1 is
Since it is connected to the snake 11m [6, it is supported in the tube diameter direction in the sliding hole 2a formed in the second flange 5 via the sliding ring 10 and the sliding side ring 6b, and
The inside of the radiant tube 1 can be slid on, so that the radiant tube 1 will not be significantly deformed or cracked due to the difference in thermal expansion.In addition, since the gasket 11 is provided, the radiant tube 1 and the bellows In addition, a heat-resistant member 20 made of ceramic fiber is provided inside the furnace wall base 3 other than the mounting hole of the radiant tube 1, to prevent heat loss. is prevented.

(Example 2) Figure 3 shows f! of this invention. In FIG. 0 showing an embodiment of J2, a furnace wall base 3 has a furnace wall outer surface portion 3a having a flange 5 in which a sliding hole 2a is formed in the center of a circular shape, and the furnace wall base 3 has a furnace wall outer surface portion 3a having a flange 5 formed with a sliding hole 2a in a circular center portion. Joint ports 7, into which heat storage burners (not shown) are fitted, are arranged at equal intervals on the circumference. A stepped cylindrical bellows portion 4 is formed inside the furnace wall outer surface portion 3a of the furnace wall base 3, and the radiant tube 1 can be inserted into the stepped portion 4a at the center without resistance. A fixing ring 8 with a fitting hole 2b is used for attachment. Also, the bellows portion 4
has a sliding side ring 6b forming a fitting hole 2C on its opening side into which the radiant tube 1 can be fitted without any gap.
In addition, the fitting hole 2C is provided on the stepped portion 4a side.
A fixed side ring 6C having a slightly larger fitting hole 2d is provided, and a bellows 6 made of a hollow bellows portion 6a is provided between the two rings 6b and 6c.
c is in a state of being welded and fixed to the fixing ring 8. Furthermore, the sliding side ring 6b is slidably fitted inside the sliding hole 2a formed in the flange 5, and the radiant tube 1 is inserted into the fitting hole 2b of the fixed ring 8 and the sliding hole 2a formed in the flange 5. Fitting hole 2 of fixed side ring 6C of bellows 6
d and then welded and fixed to the end portion 12 of the radiant tube 1.

Therefore, in this embodiment, as in the first embodiment, deformation and cracking due to the temperature difference between the burner side and the exhaust side of the radiant tube 1 can be prevented, and leakage of hot air can also be prevented by the bellows 6. . In addition, in this embodiment as well, the furnace wall base '! A heat-resistant member 20 made of ceramic fiber is provided in the internal space of A3 to prevent heat loss.

(Example 3) FIG. 4 shows a third embodiment of the invention.

In the figure, the furnace wall base 3 has a furnace wall outer surface portion 3a with a sliding hole 2e formed in a circular center portion and a flange 15 fixed thereto by welding.
Joint ports 7, into which heat storage burners (not shown) are fitted, are arranged at equal intervals on the circumference. A cylindrical bellows part 16 is formed inside the oven wall outer surface part 3a of the oven wall base 3, and is fitted inside the bellows part 16 on the opening side of the bellows part 16, and is connected to the flange 15. A sliding ring is provided with a fixing ring 17b into which the cylindrical portion 15a is fitted, and a fitting hole 2f near the inner part thereof into which the radiant tube 1 can be fitted without a gap, and which is capable of sliding on the inside of the bellows part 16. 17c, both rings 17b
, 17c is a bellows 1 consisting of a hollow bellows portion 17a.
7 is provided. Then, the fixing ring 17b fits into the cylindrical portion 15a of the flange 15, and the bellows portion 1
6, and the sliding ring 17c also allows the radiant tube 1 to fit into the fitting hole 2f.
After passing through the radiant tube 1 and fitting it into the sliding hole 2e of the flange 15, the radiant tube 1 is inserted inside the bellows portion 16.
It is welded and fixed to.

As described above, in this third embodiment, as in the above two embodiments, it is possible to prevent deformation and cracks from occurring due to the temperature difference between the burner side and the exhaust side of the radiant tube 1, and the bellows 6 prevents hot air from flowing out. It can be prevented. Also in this example.

A heat-resistant member 20 made of ceramic fiber is provided in the interior space of the furnace wall base 3 to prevent heat loss.

[Effects of the Invention] As explained above, the present invention provides a mounting structure for a radiant tube that is approximately W-shaped, both ends of which are attached to the furnace wall, and the burner flame is sent out from one end. Since at least the burner flame delivery side end of the tube is slidably attached to the furnace wall portion via a bellows, the temperature difference between the burner side high temperature part and the exhaust side low temperature part in the radiant tube Even if thermal strain occurs, the expansion and contraction can be released by sliding at the radiant tube attachment part.
It is possible to prevent the radiant tube from deforming or cracking, and also to prevent hot air from dispersing to the outside, reducing the need for repair of ancillary equipment, and making it possible to reuse ancillary parts. It has a huge effect.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a front view and a cross-sectional view illustrating the whole of one embodiment of the radiant tube mounting structure according to the present invention, and FIGS. 2 to 4 show the radiant tube mounting structure according to the present invention. FIG. 5 is an enlarged cross-sectional view illustrating a conventional radiant tube mounting structure. 1... Radiant tube, 3... Furnace wall base, 6... Bellows. Patent applicant Daido Steel Co., Ltd. Representative Patent Attorney Yutaka Oshio Figure 3 Figure 4

Claims (1)

[Claims] (1) In the mounting structure of the radiant tube, which has a roughly W-shape and has both ends attached to the furnace wall so as to send out the burner flame from one end, at least the burner flame sending side end of the radiant tube is attached to the furnace wall. A radiant tube mounting structure characterized by being slidably attached to the section via a bellows.