JPH074471Y2 - Exhaust device for tunnel furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tunnel furnace, and more particularly, to an exhaust device of the tunnel furnace.

<Prior art> The tunnel furnace is used for firing ferrite, ceramics, etc., and the workpieces mounted on the base plate are sequentially fed into the tunnel furnace to determine the length of the tunnel furnace and the moving speed of the base plate. The temperature of the tunnel furnace, the composition of atmospheric gas in the tunnel furnace, the pressure in the furnace, etc. are adjusted so that a predetermined heat treatment can be received within a predetermined time determined by It is done like this.

Usually, a tunnel furnace has a refractory material, for example, a brick lining, and has a lower part and an upper part that are separated by a bed plate to be transferred. For heating, a heater is provided on the lower and upper parts of the bed plate. Is usually done by.

<Problems to be solved by the invention> Since the workpiece usually generates gas when heat-treated,
It is necessary to achieve proper gas circulation in order to properly maintain the composition, pressure, temperature, etc. of the atmospheric gas in the furnace.
For that purpose, it is necessary to properly carry out the gas supply and the gas exhaust.

In conventional tunnel furnaces, gas is normally fed in from the bottom of the row of workpieces in the direction of the bed plate transfer, and exhaust is also performed from the top of the row of workpieces in the direction of the bed plate transfer. Met.

However, when exhaust is performed in the lateral direction, the exhaust holes tend to be blocked by tar or the like.

An object of the present invention is to provide an exhaust device for a tunnel furnace that solves the above problems in the conventional art.

<Means for Solving the Problems> According to the present invention, a plurality of upper heater accommodating recesses that are open to the inside of the furnace are provided in the ceiling wall of the tunnel furnace at intervals in the longitudinal direction. In a tunnel furnace in which upper heaters are arranged in the recesses, the upper heater accommodating recess is communicated with an exhaust device including a plurality of main exhaust holes that open inside the furnace and penetrate the ceiling wall almost vertically. An exhaust device for a tunnel furnace is provided.

The at least one upper heater accommodating recess may be communicated with at least one main exhaust hole through a substantially horizontal passage.

The exhaust device may be provided with a tar separator.

The exhaust device may include an exhaust chamber provided above the ceiling wall.

<Operation> Since the upper heater accommodating recess is made to communicate with the exhaust device including a plurality of main exhaust holes that open inside the furnace and penetrate the ceiling wall, the exhaust stays inside the furnace, particularly in the upper heater accommodating recess. Is eliminated, the atmosphere can be easily controlled, and the desired performance of the workpiece can be secured.

<Embodiment> FIG. 1 is a partial cross-sectional view of a tunnel furnace shown as a first embodiment of the present invention, in which 1 is a ceiling wall, 2 is a bottom wall, 3 is a work piece, and from the left in the drawing. Base plate 4 on the right side
It is placed on and moves with the base plate 4. Reference numeral 5 is a base plate supporting portion on which the base plate 4 is placed. 7 is a gas inlet for feeding gas into the furnace.

The ceiling wall 1 is provided with a plurality of upper heater accommodating recesses 8 which are spaced from each other in the longitudinal direction (horizontal direction in the figure) with an opening 9 opening into the furnace. The upper heaters 10 are arranged respectively in the. An exhaust chamber 11 is provided above the ceiling wall 1, and a plurality of main exhaust holes 12 spaced in the longitudinal direction are provided so as to penetrate the ceiling wall 1 and open to the inside of the furnace and the exhaust chamber 11. Further, a plurality of auxiliary exhaust holes 13 and 14 are provided to connect the upper heater housing recesses 8 and the exhaust chamber 11 to each other. In the figure, an auxiliary exhaust hole 13 directly connects the upper heater housing recess 8 and the exhaust chamber 11, and an auxiliary exhaust hole 14 connects the upper heater housing recess 8 and the exhaust chamber 11 to the main exhaust hole 12.
Can be connected via.

By providing the exhaust holes 12, 13, and 14, the atmosphere gas inside the furnace can be easily controlled, and the quality of the product can be improved.

An exhaust pipe 15 is connected to the exhaust chamber 11, and the exhaust pipe 15 is provided with a tar separator 16 and an exhaust fan 17.

The exhaust chamber 11, the exhaust holes 12, 13, and 14, the exhaust pipe 15, the tar separation device 16, and the exhaust fan 17 constitute the exhaust device of the present invention.

FIG. 2 is a sectional view of another embodiment according to the present invention, in which a base plate 4 for supporting the workpiece 3 is provided on a base plate supporting portion 5 for partitioning the inside of the tunnel furnace into an upper chamber 23 and a lower chamber 22. The paper is transferred on the rails perpendicular to the paper surface. The upper heater 10 is located in the upper heater accommodating recess 8 and is supplied with electric power through the lead wire 10a. The lower heater 19 is arranged in the lower chamber 22
Power is supplied via 19a.

The gas insertion tube 7 ′ has a plurality of openings 7 a, 7 a for supplying gas into the furnace from the lateral direction of the furnace, below the lower heater 19. Gas is sent from the lower chamber 22 to the upper chamber 23 through the opening 20 provided in the base plate supporting portion 5.

The exhaust system is composed of a plurality of main exhaust holes 12 (indicated by broken lines) spaced in the longitudinal direction similar to the embodiment of FIG.
Auxiliary exhaust hole 1 that connects 12 with the upper heater housing recess 1
4, an exhaust pipe 18 connected to the main exhaust hole 12, a tar separation device 16 connected to the exhaust pipe, and an exhaust fan 17. It is desirable to appropriately provide a manifold (not shown) for commonly connecting the plurality of main exhaust holes 12 to the exhaust pipe 18. Connecting each upper heater housing recess 8 with the auxiliary exhaust hole 14 to the main exhaust hole 12 simplifies the structure of the exhaust system and thus the furnace.

The above-described embodiment is merely an example, and various modifications of the length, height, and other shapes can be implemented within the scope of the present invention.

<Effects of the Invention> According to the present invention, since the upper heater housing recess is made to communicate with the exhaust device including the plurality of main exhaust holes that are open to the inside of the furnace and penetrate the ceiling wall, the inside of the furnace, especially the upper heater housing is accommodated. Exhaust gas does not stay in the recess, the atmosphere can be easily controlled, and desired performance of the workpiece can be secured.

[Brief description of drawings]

1 is a partial longitudinal sectional view of a tunnel furnace according to a first embodiment of the present invention, and FIG. 2 is a partial transverse sectional view of a tunnel furnace according to a second embodiment of the present invention. 1: Ceiling wall, 3: Work piece, 4: Base plate 5: Base plate support, 7: Gas inlet 8: Upper heater housing recess, 9: Opening 10: Upper heater, 11: Exhaust chambers 13, 14 : Auxiliary exhaust hole, 12: Main exhaust hole 15, 18: Exhaust pipe, 16: Tar separation device 17: Exhaust fan, 19: Lower heater 20: Opening of base plate support part, 22: Lower chamber 23: Upper chamber

Claims (4)

[Scope of utility model registration request] 1. A type in which a plurality of upper heater accommodating recesses are provided inside the ceiling wall of a tunnel furnace and are opened in the furnace at intervals in the longitudinal direction, and the upper heaters are respectively disposed in the upper heater accommodating recesses. In the tunnel furnace, the exhaust apparatus for the tunnel furnace is characterized in that an upper heater accommodating recess is made to communicate with an exhaust apparatus including a plurality of main exhaust holes which are opened inside the furnace and penetrate the ceiling wall substantially vertically. 2. The tunnel furnace exhaust system according to claim 1, wherein at least one upper heater accommodating recess communicates with one of the main exhaust holes through a substantially horizontal passage. Exhaust device for tunnel furnace. 3. An exhaust device for a tunnel furnace according to claim 1, wherein the exhaust device includes a tar separator. 4. The exhaust device for a tunnel furnace according to claim 1, wherein the exhaust device includes an exhaust chamber provided in an upper portion of a ceiling wall.