JPH0113998Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a radiant panel applied to heating furnaces and the like.

[Prior art and its problems] In heating furnaces that heat objects such as steel with a flow of high-temperature gas, radiation of the high-temperature gas is primarily used as a means of heat transfer, but gas is essentially a radiation source. Due to the low heat transfer efficiency of the furnace. Therefore, in recent years, it has been proposed to improve the heat utilization efficiency by installing a radiant panel inside the furnace. It has also been proposed to use a breathable plate-like body as such a radiant panel.

To explain a conventional example of a heating furnace equipped with such a radiant panel, as shown in Fig. 5, the furnace ceiling 1
A radiant panel 2 is installed parallel to the support surface 3, and a high-temperature gas flow is circulated as shown by the white arrow in the figure to heat the object 4 supported on the support surface 3. The radiant panel 2 emits radiant heat as indicated by solid arrows in the figure. However, in such conventional technology, the radiant heat emitted from the lower surface of the radiant panel 2 hits the object to be heated 4, but the radiant heat emitted from the upper surface of the radiant panel 2 hardly contributes to heating the object to be heated 4. Item 4 could not be heated effectively.

Therefore, as shown in FIG. 6, a heating furnace was proposed in JP-A-60-17686, in which a radiant panel 2 was installed almost perpendicular to the high-temperature gas flow.
In this heating furnace, most of the high-temperature gas flow passes through the air-permeable radiant panel 2 and heat is effectively transferred to the radiant panel 2, and a portion of the radiant heat released from the radiant panel 2 is directly exposed. The radiant heat that hits the object to be heated 4 and the furnace ceiling 1 is reflected and hits the object to be heated 4, so that the object to be heated 4 can be heated effectively.

As the radiant panel 2, a ceramic breathable plate-like body having a honeycomb shape or the like is suitably used. However, while it is relatively easy to obtain honeycomb-shaped ceramic breathable plate bodies with a cross-sectional area of about 12 x 12 cm, it is quite difficult to manufacture ceramic plates with a cross-sectional area several times this size. In order to create a radiant panel with a large area of 0.5 to ^several square meters for use in steel heating furnaces, etc., it is necessary to incorporate a large number of such ceramic breathable plates. In that case, in order to provide heat resistance, most of the material is made of ceramics, so the structure must be resistant to breakage. Furthermore, in consideration of manufacturing costs and ease of repair in the event of damage, it is desirable to have a structure that is as simple as possible.

The above-mentioned Japanese Patent Laid-Open No. 60-17686 also proposes a radiant panel used for this purpose. In this radiant panel, a plurality of ceramic honeycombs are placed on a beam suspended from hanging rods at both ends, and a horizontal frame is placed on top of the beam. Next, another plurality of ceramic honeycombs are placed on top of this horizontal frame, and another horizontal frame is placed on top of this, and so on, and this process is repeated to form a radiant panel.

Although a radiant panel with such a configuration is useful in its own way, the relatively low strength ceramic honeycomb is subjected to the load of multiple horizontal frames stacked on top of it, and the horizontal frames are loaded with multiple horizontal frames stacked on top of it. The load is applied to the horizontal frame and multiple ceramic honeycombs, each of which is easily damaged.

Therefore, the present inventor previously proposed a radiant panel as shown in FIG. 4 in which most of the horizontal frames were replaced with vertical frames in Utility Application No. 58-134423.

However, in the case of the radiant panel of Japanese Patent Application Laid-open No. 60-17686 and the radiant panel of U.S. Pat. As can be seen, they are all supported by one beam 23. The beams therefore have a relatively large cross-sectional area and are of considerable weight. Additionally, in order to prevent the ceramic honeycomb and frame material placed directly on the beam from slipping off, grooves are formed on the upper surface of the beam, giving it a complex cross-sectional shape. Moreover, since this beam is provided under the flow of high-temperature gas, it is made of high-strength ceramics. As a result, long beams with large and complex cross-sections had to be manufactured from high-strength ceramics.
It is not easy to manufacture such beams by economically advantageous extrusion methods.

[Purpose of the invention] Therefore, the purpose of the present invention is to solve these problems of the prior art and provide a light-weight or easy-to-manufacture radiant panel.

[Configuration of the invention] The radiant panel of the invention is a radiant panel that is installed suspended in a furnace through which high-temperature gas flows, and includes at least two hanging rods suspended from the furnace ceiling at a predetermined interval. , a beam structure connected to the lower end of the hanging rod, a plurality of frame members and a plurality of ceramic plate bodies placed and supported on the beam structure, and the beam structure has a high height. It is characterized by consisting of a strong non-grooved beam and a grooved beam placed thereon.

Therefore, this radiant panel is supported as a whole by the hanging rod, and most of the load is applied to the beam structure connected to the lower end of the hanging rod. This beam structure consists of a high-strength non-grooved beam and a grooved beam placed thereon.

Therefore, the plurality of frame members and the plurality of ceramic plates are engaged with and supported by the grooves of the grooved beam, and not only can they simply receive the load, but also are prevented from falling off due to displacement. Furthermore, the loads of the plurality of frame members, the plurality of ceramic plates, and the grooved beams are all supported by the high-strength non-grooved beams. Moreover, this high-strength grooveless beam has a simple cross-sectional shape because it does not have grooves, and it does not require a function to prevent the frame material and ceramic plate from slipping off, so it can have a small cross-sectional shape. , high-strength products that can withstand bending loads can be easily manufactured using techniques such as extrusion molding.

On the other hand, although grooved beams have a more complex cross-sectional shape than non-grooved beams, they are not subject to large bending loads, and therefore do not necessarily require high strength products. This means that it can be easily manufactured using technology. Further, the radiant panel of the present invention has an extremely simple structure as a whole, is easy to assemble, and can easily be constructed in a large area.

[Specific Configuration] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 2, a pair of hanging rods 12, 12 are suspended in parallel through the furnace ceiling 11. A mounting fitting 13 is provided at the upper end of each hanging rod 12, and the length of the lower end of the hanging rod 12 can be adjusted by means of a bolt 10 of the fitting 13. After the hanging rod 12 is inserted into the hole 14 of the furnace ceiling 11 and adjusted to a predetermined lower end protrusion length, the hole 14 is filled with materials such as castable refractories and bricks.
2 is firmly fixed. Note that the hanging rod 12 is preferably formed of high-strength ceramics such as silicon carbide and silicon nitride.

A grooved beam 17 and a round pipe 18, which is a non-grooved beam, are attached to the lower ends of the hanging rods 12, 12. As can be seen from FIG. 1, the grooved beam 17 has a groove 25 formed on its upper surface and a groove formed on its lower surface to have an H-shaped cross section, and is placed on the round pipe 18. Therefore, the grooved beam 17 can withstand the compressive load due to the weight of the plurality of vertical frames 19 and the plurality of ceramic air-permeable plates 20 placed thereon, and also prevents misalignment of these by the grooves 25. If it can be prevented, grooved beam 1
The thickness of each part of 7 may be small and the bending load is not so great, so it does not necessarily need to be made of high-strength ceramics. Therefore, ceramics made of appropriate materials such as mullite, alumina, silicon carbide, and silicon nitride can be used, and reaction sintered bodies of silicon carbide and silicon nitride are also preferred. Note that the grooves on the lower surface not only increase the strength of the grooved beam 17 itself, but also prevent misalignment between the grooved beam 17 and the round pipe 18.

The round pipe 18 has a vertical frame 1 placed on it.
9, the weight of the ceramic breathable plate-like body 20 and the grooved beam 17 is applied, and this round pipe 18
Since both ends thereof are only supported by the stopper pins 27, a considerable bending load is applied thereto. Therefore, the round pipe 18 is made of high strength ceramics. Specific materials include silicon carbide and silicon nitride pressureless sintered bodies. The round pipe 18 has a simple and small cross-sectional shape, and even if it is a high-strength product, it can be easily manufactured by extrusion molding or the like. Round pipes are particularly lightweight and
Although extrusion molding is preferable because it is easy, solid round bars, square bars, etc. may be used instead.

As shown in FIG. 3, the grooved beam 17 has holes 26 at both ends through which the hanging rods 12, 12 pass, and a groove 25 is formed in the upper surface along the longitudinal direction.
A through hole is formed in the round pipe 18 as well. The hanging rod 12 has a hole 26 and a round pipe 1.
8, and the stopper pin 27 is inserted from the lateral direction as shown in FIG.
A beam structure consisting of a round pipe 7 and a round pipe 18 is adapted to be secured to the lower end of the hanging rod 12.

The plurality of vertical frames 19 are supported by having their lower ends fitted into the grooves 25 of the grooved beam 17 (see FIG. 3), and mutually arranged at a predetermined interval at approximately right angles to the grooved beam 17. will be erected parallel to. A guide groove 28 is formed as a guide on the inner surface of the vertical frame 19. Therefore, the vertical frames 19 located on both sides have a U-shaped or H-shaped cross section, and the vertical frame 19 located in the middle has a U-shaped or H-shaped cross section. It has an H-shaped cross section. These vertical frames 19 can be formed by extruding mullite, alumina, silicon carbide, or the like.

Between each vertical frame 19, a plurality of honeycomb-shaped ceramic air-permeable plate-like bodies 20 are arranged in the vertical direction. In this case, the breathable plate-like body 20 has one side, for example.
It is a 12 cm square with a thickness of 1 to 3 cm, and has a shape in which a number of 5 mm square holes with 0.5 mm hole walls are drilled through and open on the square surface.

In this embodiment, the breathable plate-like bodies 20 are bonded together with an adhesive 21 in the width direction of the panel surface, and are used as a group of two pieces. This increases the distance between the vertical frames,
By reducing the number of vertical frames, the structure can be made simpler and the overall weight can be reduced. Such adhesive 2
As No. 1, it is preferable that the coefficient of thermal expansion is approximately the same as that of the ceramic plate. A group of two joined breathable plates 20 are supported by inserting their ends into the guide grooves 28 of each vertical frame 19, and are arranged in multiple stages vertically between each vertical frame 19 to form a panel. form a surface.

The second horizontal frame 16 has hanging rods 12 at both ends thereof,
12 is inserted through and connected to the upper part of the hanging rod, so that it can be slid up and down. As shown in FIG. 1, the second horizontal frame 16 has grooves formed on the upper and lower surfaces and has an H-shaped cross section, and the upper end of the vertical frame 19 fits into the groove on the lower surface, and The upper part of the frame 19 is supported by a second horizontal frame 16.

Similarly, the first horizontal frame 15 has hanging rods 12, 12 inserted through its both ends, a groove formed in its lower surface, and a U-shaped cross section. Note that the first and second horizontal frames 15 and 16 can be made of the same material as the vertical frame 19.

Between the first horizontal frame 15 and the second horizontal frame 16, a plurality of partition walls 22 are arranged in the horizontal direction with their upper and lower edges inserted into the grooves of the horizontal frames 15 and 16. . This partition wall 22 is used to save the air permeable plate 20 when the distance between the heated object (not shown) and the furnace ceiling 11 is too wide and there is no need to form a radiant panel covering almost the entire height. used for. Therefore, in the present invention, the first horizontal frame 15 and the partition wall 22 are not necessarily necessary. As the partition wall 22, a molded ceramic fiber board, a calcium silicate board, or the like can be used.

In the above configuration, each of the two breathable plate-shaped bodies 20 is held at both ends in the guide groove 28 of each vertical frame 19 to prevent it from falling off, and each vertical frame 19 is prevented from falling off.
are held at their upper and lower ends by the grooves of the second horizontal frame 16 and the grooves 25 of the grooved beam 17 to prevent them from falling off. The grooved beam 17, the round pipe 18, and the horizontal frames 15 and 16 are connected to the hanging rods 12 and 16 at both ends.
connected by. Therefore, a radiant panel having a large area can be formed by firmly assembling a plurality of air-permeable plate-like bodies 20. Since the breathable plate-like body 20 has a honeycomb shape, for example, high-temperature gas flows therethrough, heat is easily transferred, and the radiation performance is good.

In addition, most of the load of each breathable plate-like body 20 is applied to the grooved beam 17, and the vertical frame 19 and the horizontal frame 15, 16
Since the vertical frame 19 and the horizontal frames 15 and 16 are not easily damaged, the vertical frame 19 and the horizontal frames 15 and 16 are not easily damaged. In addition, when assembling this radiant panel, the breathable plate-like body 20 is attached to the vertical frame 19.
Workability is good because all you have to do is insert them between them and arrange them one above the other. Furthermore, since the overall structure is simple, manufacturing costs are relatively low.

In the present invention, the number of hanging rods may be three or more as necessary. Moreover, each hanging rod may be suitably joined in the length direction as necessary. Further, instead of the guide groove, a guide having an appropriately shaped protrusion or the like may be provided.

Honeycomb-shaped ceramic plates are preferred because they are lightweight and have low ventilation resistance. Among them, ceramics made of cordierite, mullite, silicon carbide, silicon nitride, alumina, etc. have high radiation properties. It is more preferable that it has and/or high heat resistance. However, the ceramic air-permeable plate-like body is not limited to a honeycomb-like body, and may have, for example, a three-dimensional network of air holes. Further, although it is preferable that the ceramic plate-like body has air permeability, it may be non-air permeable.

In addition, when applying the radiant panel according to the present invention to a heating furnace or the like, a plurality of radiant panels may be installed in parallel at predetermined intervals along the flow direction of high-temperature gas. Further, if the width inside the heating furnace is wide, a plurality of radiant panels as described above may be installed adjacent to each other in the horizontal direction.

As mentioned above, it is preferable that the radiant panel be installed so as to be suspended almost perpendicular to the high temperature gas flow, but it is not necessarily limited to this, and it may be suspended obliquely or parallel to the high temperature gas flow. It may also be installed.

[Effects of the Invention] As explained above, according to the present invention, a radiant panel having a large area can be formed by assembling a plurality of honeycomb-shaped ceramic plate bodies. Furthermore, by using the vertical frame, the ceramic plate is subjected to only a compressive load due to its own weight, so there is less risk of breakage. What is particularly important is that instead of the conventional single beam, the beam structure is made up of grooved beams and non-grooved beams, and their functions are shared, making manufacturing easier. In this way, a radiant panel can be provided that has a relatively simple structure, is easy to assemble, and is inexpensive to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a radiant panel according to an embodiment of the present invention, Fig. 2 is a front view of the radiant panel shown in Fig. 1, and Fig. 3 is a main part taken along line A-A in Fig. 2. 4 is a longitudinal sectional view of a conventional radiant panel, FIG. 5 is an explanatory diagram showing a conventional heating furnace, and FIG. 6 is an explanatory diagram showing a heating furnace to which the present invention is applied. 11: furnace ceiling, 12: hanging rod, 16: second horizontal frame, 17: grooved beam, 18: round pipe, 19: vertical frame, 20: ceramic plate, 21: adhesive.

Claims (1)

[Scope of utility model registration request] A radiant panel that is installed suspended in a furnace through which high-temperature gas flows, and includes at least two hanging rods suspended from the furnace ceiling at a predetermined interval, and a radiant panel connected to the lower end of the hanging rods. The beam structure includes a high-strength non-grooved beam and a plurality of ceramic plates placed on and supported by the beam structure. A radiant panel characterized by consisting of a grooved beam.