JPH0655030U - Gate type damper for furnace - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a gate type damper for a furnace that is easy to open and close, requires little maintenance, and has a long service life. [Constitution] In the first invention, hollow guides 5 made of metal into which cooling air is blown are provided on both sides of the flue 3, and dampers 4 made of heat-resistant ceramic are slidably supported by these hollow guides 5. In the second invention, the outer frame of the damper made of heat-resistant ceramic is used as a hollow body instead of the guide, and cooling air is blown into the inside thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gate-type damper for a furnace attached to a flue to control the furnace pressure.

[0002]

[Prior art]

 For example, in a downdraft furnace as shown in FIG. 1, it is desirable to attach a slidable gate type damper 4 to a flue 3 connecting the furnace body 1 and the chimney 2 in order to control the furnace pressure. In this case, the damper itself may consist of a refractory material with excellent heat resistance, a ceramic fiber, etc., but to facilitate opening and closing, use a metal material for the outer frame 4a and guide 4b of the damper. I have no choice. Then, since these metal materials are exposed to high heat, they are worn out in a short period of time, and there is a problem that maintenance requires a lot of trouble.

[0003]

[Problems to be solved by the device]

 The present invention has been completed in order to solve the above-mentioned conventional problems, and to provide a gate type damper for a furnace which can be easily opened and closed and has a long service life with little maintenance required. .

[0004]

[Means for Solving the Problems]

 The first invention made in order to solve the above problems is to provide a metal hollow guide on both sides of a flue into which cooling air is blown, and a heat-resistant ceramic damper can be slid by these midair guides. It is characterized by being supported by. A second invention made to solve the same problem is to install a heat-resistant ceramic damper mounted on a metal hollow frame into which cooling air is blown, by providing metal guides on both sides of the flue. The feature is that they are slidably supported by these guides.

[0005]

[Action]

 According to the first invention, the metal guide that slidably supports the damper made of heat-resistant ceramic is a hollow guide that is cooled by the cooling air blown into it. This prevents the outer frames of the guides and dampers from wearing out. According to the second invention, since the frame of the heat-resistant ceramic damper is a hollow metal frame into which the cooling air is blown, the high temperature exhaust gas flowing through the flue may damage the guide and the outer frame of the damper. Is prevented. Moreover, in either case, since the damper is opened and closed along the metal guide, there is an advantage that it can be easily opened and closed.

[0006]

【Example】

 Hereinafter, these devices will be described in more detail with reference to the illustrated embodiments. First Embodiment of the Invention FIG. 2 shows an embodiment of the first invention, in which hollow guides 5 made of metal are attached to the wall surfaces on both sides of the flue 3, and dampers 4 made of heat-resistant fiber are provided on the upper surfaces thereof. It was supported. As long as the damper 4 is made of heat-resistant ceramic, it can be made of refractory, lightweight foam, ceramic fiber block or molded body made of ceramic fiber, but it is lightweight and resistant to thermal shock from cold air. It is preferably made of fiber. The outer periphery of the damper 4 made of heat-resistant fiber is surrounded by a metal frame body 6, and a sliding surface is provided between the frame body 6 and the hollow guide 5. In the practical example, both the frame 6 and the hollow guide 5 are made of stainless steel, and the frame 6 is also cooled by the cooling air blown from the air ejection holes 7 formed on the inner surface of the hollow guide 5. It has become so. As shown in FIG. 3, a rack 8 is integrally attached to the damper 4 made of heat-resistant fiber, and by engaging the rack 8 with a pinion 10 driven by a motor 9, the damper 4 is opened. Can be closed.

In the first invention, the cooling air blown into the hollow guide 5 not only cools the hollow guide 5 itself, but also the cooling air blown out from the air ejection holes 7 causes the frame body around the outer periphery of the damper 4 made of heat-resistant fiber. Since 6 is also cooled, wear of these metal parts is prevented, and it can be used for a long period of time with almost no maintenance required. Further, since the slide surface is formed between the hollow guide 5 and the frame body 6, the damper 4 can be easily opened and closed, and the furnace pressure can be accurately controlled.

Embodiment of Second Invention FIG. 4 shows an embodiment of the second invention. In this case, the metal guides 11 provided on the wall surfaces on both sides of the flue 3 are solid bodies. is there. On the other hand, a metal frame 6 and a metal hollow frame 12 are attached to the outer periphery of the heat-resistant fiber damper 4, and cooling air is blown into the hollow frame 12. Further, as in the first invention, an air ejection hole 13 is formed in this hollow frame 12 to cool the periphery thereof.

In the second invention, the cooling air blown into the metallic hollow frame 12 cools the metallic hollow frame 12 and the portion in contact therewith, so that it is possible to prevent wear due to high temperature exhaust gas. The damper 4 can be opened and closed. Also, like the first invention, the damper 4 can be opened and closed easily.

[0010]

[Effect of device]

 As described above, according to these inventions, since the metallic slide portion of the damper is a hollow body and the cooling air is blown into it, it is easy to open and close, and it requires almost no maintenance work. It has the advantage that it can be used over a long period of time. Therefore, the present invention is of great practical value as a gate type damper for a furnace which solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a conventional example.

FIG. 2 is a sectional view showing an embodiment of the first invention.

FIG. 3 is another sectional view showing the embodiment of the first device.

FIG. 4 is a sectional view showing an embodiment of the second invention.

[Explanation of symbols]

 3 Flue 4 Damper made of heat resistant fiber 5 Hollow guide made of metal 11 Guide made of metal 12 Hollow frame made of metal

Claims (2)

[Scope of utility model registration request] 1. A gate-type damper for a furnace, characterized in that metal hollow guides into which cooling air is blown are provided on both sides of the flue, and heat-resistant ceramic dampers are slidably supported by these hollow guides. . 2. A guide made of metal is provided on both sides of the flue, and a damper made of a heat-resistant ceramic attached to a metal hollow frame into which cooling air is blown is slidably supported by these guides. Gate type damper for the furnace.