JPH0245758Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hanging fixture that can cope with high-temperature creep deformation of a high-temperature tube body (radiation tube) in a radiation tube heating type furnace in various heat treatment furnaces.

(Prior art) A high-temperature tube (radiation tube) used in a heat treatment furnace that requires atmosphere adjustment is installed at the furnace ceiling and furnace bottom so that the direction in which the material to be heat treated advances is perpendicular to the furnace space. The length and diameter of the tube correspond to the amount of heat required for heat treatment. Due to the similarity of shapes, names such as U-shape and W-shape are used as shape names.

In the U-shape, the straight part of the font corresponds to the straight pipe of the high-temperature pipe body, and the ridged part corresponds to the curved pipe. The W type is a shape in which two U shapes are further connected by a curved pipe. The straight pipes are arranged in parallel on the same level with a certain distance between them, and are connected by curved pipes that maintain the distance so that the combustion flame and gas flow smoothly inside the pipes.

Inside the furnace, a straight pipe section with a size corresponding to the width of the furnace and a curved pipe connecting the straight pipes are installed so that the opening of the straight pipe exits outside the furnace. Usually, the U-shaped or W-shaped high-temperature tube is placed horizontally across the inside of the furnace, and especially at the furnace ceiling, the high-temperature tube is supported using both sides of the furnace. There is.

As a support method, the straight pipe at the opening is inserted into a hole penetrating the furnace wall to support it, and the straight pipe on the furnace side is lengthened. If the straight pipe section is long, if it is supported only by the through hole and the end on the support side, the high-temperature pipe body will bend, causing a situation that does not meet the usage conditions. In order to prevent this situation, a hanging fixture is used to support the straight pipe section at the center of the furnace.

The shape of the central suspension fitting commonly used in the past is such that a cross beam 2 supporting a high-temperature tube 1 is suspended by two rod rods 3, as shown in FIG. The rod rod 3 and the cross beam 2 are welded 20
Alternatively, it is fixed with bolts and nuts 30 and suspended in the furnace from the furnace ceiling 6.

In this case, the rod rod 3 passes through a hole in the bricks and insulation material of the furnace ceiling 6, and each time the high-temperature tube 1 on the cross beam 2 fixed to the rod rod 3 repeats expansion and contraction in the axial direction, the rod rod 3 moves back and forth, damaging the bricks or insulation material of the furnace ceiling 6, or conversely deforming the high-temperature tube 1.

Also, regarding the deformation of the high temperature tube body 1 in the left and right direction,
A similar situation is occurring. Furthermore, the rod rod 3 and the cross beam 2 once assembled in the furnace may be deformed, etc., and when they are removed and replaced, the rod rod 2 and the cross beam 3 may be damaged.
All parts needed to be replaced with new ones.

In addition, one rod 3 as shown in FIG.
Therefore, when supporting the high-temperature tube body 1, a receiving metal fitting 4 having a curved surface is used, and the rod rod 3 and the receiving metal fitting 4 are used.
The high temperature tube 1 is placed on the concave surface of the tube.

The bracket 4 is a rod rod 3 that is fixed and suspended from the furnace ceiling 6 by welding or bolts.
It is suspended by. The rod rod 3 is the fourth
In the case of the figure, when the high-temperature tube 1 moves in a direction perpendicular to the plane of the paper, the rod rod 3 is bent into an arch in the direction perpendicular to the plane of the paper from near the furnace ceiling 6. When the rod rod 3 moves in the left-right direction with respect to the plane of the drawing, the rod rod 3 bends in an arch from the vicinity of the furnace ceiling 6 to the left and right in the figure.

In the above case, if the rod rod 3 is not deformed in the hanging fixture shown in FIG. 4, the high temperature tube 1 and the rod rod 3 will come into contact with each other, and the rod rod 3 will not bend, but the straight high temperature tube 1 will be bent. creates a deformed concave surface. In addition, the high temperature tube 1 rides on the receiving fitting 4, creating a concave surface on the high temperature tube 1. When the rod rod 3 is bent into a bow, the contact portion between the rod rod 3 and the cross beam 2 shown in FIG. 3 or the bracket 4 shown in FIG. 4 is bent into a dogleg shape.

Furthermore, when the parallel pipes deform separately in the vertical direction and a single load acts on the bracket 4 and the rod rod 3, if the strength of the bracket 4 is stronger than the strength of the rod rod 3, the rod rod 3 will deform. , even if the high-temperature tube 1 becomes cold and returns to its original state, the rod rod 3 remains deformed. Conversely, if the receiving metal fitting 4 is weaker than the rod rod 3, the receiving metal fitting will be deformed.

(Problems to be solved by the invention) The structure of the conventional hanging fittings could only absorb movement in one direction, so the movement of the high-temperature pipe body 1 due to expansion, contraction, and deformation could not be done smoothly.
The hanging fittings are now restraining the high-temperature pipe body 1, and various external forces (bending, compression, torsion, etc.) are applied, and the hanging fittings, which are used to extend the life of the high-temperature pipe body 1, are actually shortening their lifespan. There was a problem with making it shorter.

Other problems include deformation and damage to the hanging fittings themselves, damage to the furnace bricks and insulation, and a structure that makes it impossible to easily replace parts within the furnace depending on the degree of damage to the fittings.

Furthermore, with conventional hanging fittings, heat accumulates in the part that is in contact with the high-temperature tube 1, causing a local decrease in the temperature of the high-temperature tube 1, causing partial deformation of the high-temperature tube 1, etc. The dot was hot.

(Means for solving the problem) The present invention consists of a rod rod on which a hanging fitting for a high-temperature tube is suspended, an upper connecting fitting connected to the lower part of the rod, and an intermediate connecting fitting connected in a ring shape. It consists of a connecting fitting and a receiving fitting connected to this fitting.

In other words, there is a rod rod that penetrates the furnace ceiling, and a removable upper connection fitting is attached to the bottom of the rod.
A hanging metal fitting is constructed by assembling the annular part of the metal fitting and the annular part of the intermediate connecting metal fitting so as to be perpendicular to each other, and a receiving metal fitting at the lower end of the intermediate connecting metal fitting that supports the combined high-temperature pipe body so that it can be attached or detached freely. be.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 shows a hanging fitting for a high-temperature pipe body in one embodiment of the present invention, and FIG. 2 shows an overall outline of the hanging fitting installed in a furnace.

Reference numeral 5 denotes a rod rod that supports the hanging fitting parts in the furnace, and this rod rod penetrates the furnace wall 21 of the furnace ceiling part 6, and a spring 6' is provided on the part that protrudes outside the furnace.
The springs 6', 6 are balanced by a part of the dead weight of the high-temperature tube 1 and the weight of the furnace hanging fitting part 22.

Reference numeral 7 denotes an upper connecting fitting, which has a U-shaped notch for fitting the protrusion 8 at the lower end of the rod rod 5, and a flat surface that allows rotation at the part that contacts the protrusion 8 of the rod rod 5. The lower side of the upper connecting fitting 7 forms an annular portion 9 having a substantially circular cross section.

The protrusion 8 of the rod rod 5 and the U of the upper connection fitting 7
A removable stopper metal fitting 10 is attached to the character part to prevent it from coming off due to various movements. Reference numeral 11 denotes an intermediate connecting fitting, which is formed of an annular portion 9 of the upper connecting fitting 7, an annular portion 12 engaged in a ring shape, and a hanging rod portion 13 formed integrally with the annular portion 12 on the lower side of the annular portion. has been done. This annular part 1
2 also has a substantially circular cross section, and the plane formed by the annular portion 9 of the upper connecting fitting 7 and the intermediate connecting fitting 11
The plane is perpendicular to the plane formed by the annular portion 12 .

Reference numeral 14 denotes a receiving part for the high-temperature tubes 1, which has recesses 15 for holding each of the parallel high-temperature tubes 1 from below, and a U-shaped cut in the middle of both recesses 15. It is removably engaged with a protrusion 16 provided on the lower side of the hanging rod portion 13 of the intermediate connecting fitting 11. In addition, a plurality of holes 17 are provided in the recessed portion of the metal holder 14 so as to penetrate through the curved surface, thereby allowing air to circulate.

(Function) In the present invention, the upper connecting fitting 7 and the intermediate connecting fitting 1
The contact point of 1 is a contact between curved surfaces, and the contact surfaces are made up of parts that are substantially in point contact, so when the high-temperature tube 1 is displaced to the left or right in FIG. The ring of the intermediate connection fitting 11, while riding on the ring of the upper connection fitting 7, shifts to the left or right to absorb the displacement.

Also, when the intermediate connector 11 is displaced in a direction perpendicular to the plane of the paper in FIG. 1, the hanging rod portion of the intermediate connecting fitting 11 moves in the direction perpendicular to the plane of the paper to absorb the displacement. High temperature tube 1
When is displaced vertically, the spring 6' acts to absorb the displacement.

(Effects of the invention) By using the hanging fitting of the present invention, it is possible to cope with extremely complicated displacements of the receiving fitting due to expansion and contraction of the high-temperature tube, and therefore the movement of the rod rod is reduced. Most of the damage to the ceiling bricks has disappeared. It was confirmed that the heat dissipation holes significantly reduced the local deformation of the high-temperature tube body that had occurred in the receiving metal part, and that the heat dissipation effect was significant.

Due to the above comprehensive effect, the temperature of the high temperature tube is
By hanging the center part even at around 1150℃,
It is now possible to hold high-temperature tubes with significantly less deformation than before. Therefore, by using the hanging fitting of the present invention, it is possible to use the pipe in an atmosphere where the temperature of the tube body is from 950°C to about 1200°C.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is an explanatory diagram showing an overall outline of one embodiment of the present invention, and FIG. 3 is an explanatory diagram showing a conventional example.
FIG. 4 is an explanatory diagram showing another conventional example. DESCRIPTION OF SYMBOLS 1...High-temperature pipe body, 5...Rot rod, 7...Upper connecting fitting, 11...Intermediate connecting fitting, 14...Bracket.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A rod rod penetrating the furnace ceiling and suspended from the outer wall of the furnace with a spring interposed, and a rod rod with a substantially circular cross section that is removably locked to the lower part of the rod rod. an upper connecting fitting formed in an annular shape; an intermediate connecting fitting comprising an annular portion having a substantially circular cross section that engages in a ring shape with the annular portion of the upper connecting fitting; and a hanging rod portion integrated with the annular portion; and a support for supporting a high-temperature tube removably locked to the lower end of the hanging rod part of the intermediate connecting fitting, and the plane formed by the annular part of the upper connecting fitting and the plane formed by the annular part of the intermediate connecting fitting. A flexible hanging fixture for high-temperature pipes that is configured to be orthogonal to the 2. A flexible hanging fixture for a high-temperature tube according to claim 1 of the utility model registration claim, which has a through hole in the supporting surface of the support for the high-temperature tube.