JPH0612380Y2 - Spacer for heat dissipation pipe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a spacer for a heat radiating pipe arranged and used in a heat treatment furnace.

[Conventional technology]

In a steel or other heat treatment furnace, a heat radiation pipe made of a heat-resistant alloy is placed in the furnace, and heating gas is supplied into the pipe from the outside of the furnace and discharged to the outside of the furnace to keep the atmosphere in the furnace constant and the heat radiation pipe in the furnace. There is a type of heat treatment furnace that heats the inside of the furnace by radiating heat from the outer periphery. This radiant pipe is also called a radiant tube or heater tube. In addition to a straight tube, a part of the tube is bent to make a U-shape, O-shape, W-shape, and a forked shape (tribend type). It is used by being positioned above and below the wall.

For example, in a W-shaped radiator tube, as shown in (a) and (b) in Fig. 2, two straight tubes 1a, 1b, 1c, and 1d are arranged in parallel with a short one in between. Are connected to each other in a W shape by U-shaped curved portions 2a, 2b and 2c which are curved by 180 °, and both ends thereof are vertically fixed to one furnace wall 7 and the lower curved pipe portion is connected. The support 8 welded to 2c is disposed in the furnace by supporting it from the bottom of the furnace with refractory bricks or the like.

Then, on the outer surfaces of the intermediate straight pipe portions 1b and 1c, which are close to the curved pipe portions 2a and 2c and are opposed to each other, a rectangular parallelepiped support fitting 3 having an H-shaped cross section and a shape fitting between both legs of the support fitting 3 are formed. The rectangular parallelepiped sliding metal fitting 4 having a U-shaped cross section is welded, and the supporting metal fitting 3 and the sliding metal fitting 4 are also welded to each other on the opposite outer surfaces of the straight pipe portions 1c and 1d which are close to the curved pipe portion 2b. The pipes are allowed to move relative to each other with respect to expansion and contraction caused by temperature change, and the lower part supports the upper part.

In such a support structure, not only the fittings of the support fitting 3 and the sliding fitting 4 are disengaged from each other during use, but also the straight pipe portion 1b near the curved pipe portions 2a, 2b, 2c is affected by the extension force due to expansion. , As a result of concentrating on 1c, cracks were generated in the vicinity of the welded portions of the support fittings 3 and the sliding fittings 4, and they could not be used for a long time. Further, the extension of the pipe causes the pipe to be twisted, which causes the support fitting 3 and the sliding fitting 4 to be twisted.
It is considered to be one of the causes of cracks near the.

In order to solve this problem, the present applicant has previously shown in FIG.
(A), (b) A support metal fitting 3 including a trough-shaped portion having an arcuate cross section and a leg portion integrally provided in a T-shape at the outer center portion thereof.
Is welded to a curved pipe portion 2c adjacent to the curved pipe portion 2a and a curved pipe portion 2b adjacent to the straight pipe portion 1d with a leg, and the inside of the gutter-shaped portion opposite to the welding side is welded. The concave portion formed by the cylindrical surface is formed into the curved pipe portion 2a.
The structure that fits on the outer surface of the pipe and the outer surface of the straight pipe part 1d
It was proposed in Japanese Patent No. 2519.

According to this structure, since the support fitting 3 is welded to the bent outer surface of the radiating pipe, that is, the spherical surface, it is possible to withstand the stress generated by the extension of the pipe, and the adjacent pipes are formed by the concave portions having the cylindrical surface. By fitting with each other, relative movement and twisting of the tubes can be allowed, the fitting is disengaged, and cracks caused by applying a force near the welded portion of the support fitting can be prevented.

Generally, the heating gas is supplied to the radiating pipe from the upper side of the pipe as shown by the arrow, and the gas whose temperature has dropped due to heat dissipation in the furnace is discharged from the lower side to the outside of the furnace. Becomes Therefore, when the support fitting 3 shown in FIG. 3 is welded to the upper side of the curved pipe portion 2b to support the straight pipe portion 1a, the straight pipe portion 1a buckles and the support fitting 3 bites into the straight pipe portion 1a. As a result of the expansion and contraction of the straight pipe portion 1a being restrained, the straight pipe portion 1a is cracked. Further, since the support fitting 3 slides on the opposite side surface while supporting the upper load, there is a problem that stress concentrates on the sliding surface of the pipe and cracks occur.

[Problems to be solved by the device]

The present invention is intended to provide a structure of a support fitting that does not cause such cracking.

[Means for Solving the Problems]

The present invention is a support fitting that is welded to the outer surface of a bent portion of a heat radiation tube that is bent up and down, and is movably mounted on the upper surface of the support fitting in the same direction as the extension direction of the heat radiation tube. A spacer for a radiating pipe is formed of a single or a plurality of sliding metal fittings, and a cylindrical recess that slidably fits with an adjacent radiating material is formed on the surface of an intermediate metal fitting in contact with the adjacent radiating material. Use it as a solution.

〔Example〕

First, the present invention will be described with reference to the embodiment shown in FIGS.

A support metal fitting 3 having legs is welded to the upper side of the curved pipe portion 2b. The surface of the support fitting 3 on the side of the straight pipe portion 1a is formed in a horizontal plane parallel to the straight pipe portion 1a. A slide fitting 4 is placed on the support fitting 3. The surface of the sliding metal fitting 4 which is in contact with the supporting metal fitting 3 is formed into a flat surface so that the sliding metal fitting 4 can move on the supporting metal fitting 3 along the extension direction of the straight pipe portion 1a. Slippers 4
A cylindrical recess parallel to the straight pipe portion 1a having a curvature slightly larger than the outer diameter of the straight pipe portion 1a is formed on the surface of the straight pipe portion 1a side, and is fitted into the straight pipe portion 1a. On the surface of the support metal fitting 3 in contact with the sliding metal fitting 4, an oval hole 5 having a long direction parallel to the straight pipe portion 1a.
The sliding metal fitting 4 is integrally provided with a pin 6 projecting into the hole 5 so as to prevent the sliding metal fitting 4 from coming off from the supporting metal fitting 3.

In this embodiment, the number of the slip fittings 4 is one, but two slip fittings 4 can be stacked and used so that they can slide on each other.

[Action]

Sliding metal fitting 4 that comes into contact with the straight pipe portion 1a due to buckling of the straight pipe portion 1a
However, even if it bites into the straight pipe portion 1a and the relative movement cannot be performed, the sliding function between the sliding metal fitting 4 and the supporting metal fitting 3 causes a gap between the straight pipe portion 1a and the curved pipe portion 2b. Since relative movement can be maintained, pipe cracking can be prevented.

[Effect of device]

According to the present invention spacer, it is possible to prevent cracks from being generated in the mutual supporting portions of the heat radiating tube, especially in the high temperature portion, and it is possible to extend the life of the heat radiating tube as compared with the conventional case.

[Brief description of drawings]

FIG. 1 (a) is a side sectional view of an embodiment of a spacer for a heat dissipation pipe according to the present invention, FIG. 1 (b) is a front view of FIG. 1 (a), and FIG.
(A) and (b) are the front and side views of the conventional heat dissipation pipe spacer showing the relationship with the heat dissipation pipe, and Fig. 3 (a) and (b) are the conventional heat dissipation which is an improvement of the one shown in Fig. 2. It is the front view and side view of a spacer for tubes. 1a, 1b, 1c, 1d …… Straight pipe section 2a, 2b, 2c …… Curved pipe section 3 …… Supporting metal fitting 4 …… Sliding metal fitting 5 …… Hole, 6 …… Pin, 7 …… Furnace wall 8 ... …support

Claims (1)

[Scope of utility model registration request] 1. A support fitting welded to an outer surface of a bent portion of a heat radiating pipe bent up and down, and movably mounted on the upper surface of the support fitting in the same direction as the extension direction of the heat radiating pipe with respect to the support fitting. A radiating pipe spacer having a cylindrical recess that slidably fits to an adjacent radiating pipe is formed on the surface of the sliding lug that is in contact with an adjacent radiating pipe.