JP4313427B2 - Firing furnace - Google Patents

Description

  The present invention relates to a firing furnace for firing forged workpieces and ceramics using charcoal as fuel, and more particularly to a firing furnace capable of improving article firing efficiency by extending a flame of combustion gas for a long time.

  Conventionally, ceramic pottery used as a firing furnace for firing pottery is a large fixed type constructed with refractory bricks, etc., requires a large space for installation, and becomes expensive equipment. Has already proposed a pottery kiln (climbing kiln) that burns ceramics using charcoal as a fuel so that hobby potters can easily burn the pottery at home personally. .

  This ceramic pottery is mounted on a bottomed bottom kiln member, a cylindrical kiln member that forms a vertical article firing chamber inside by stacking on the bottom kiln member, and an uppermost cylindrical kiln member. Combustion that raises the article firing chamber by placing the article to be fired inside the article firing chamber, putting charcoal in the bottom kiln member and burning it with the air supplied from the air supply port The article is fired with gas.

  By the way, in the ceramic pottery as described above, the high-temperature combustion gas generated by burning the charcoal in the bottom kiln member rises in the article firing chamber, thereby firing the article on the article placing plate. However, in such a pottery kiln, in order to improve the firing efficiency of the article, it is necessary to make the flame of the combustion gas as long as possible and to bring the combustion gas into direct contact with the article. There was room for improvement in the kiln.

  Therefore, the object of the present invention is to improve the firing efficiency of the article by making the flame of the combustion gas as long as possible and by directly bringing the combustion gas into contact with the article by increasing the stagnant time in the article firing chamber. An object of the present invention is to provide a calcined furnace for firing.

In order to solve the problems as described above, the present invention is a horizontally long square, a front wall that is one end, a front wall that is a rear wall that is the other end, and a furnace body in which the interior is an article firing chamber. An internal hollow charcoal combustion chamber provided at a position below the front wall with respect to the furnace main body, and for passing the combustion gas from the charcoal combustion chamber to the article firing chamber, The position of the upper part and the lower part in contact with the front wall inside the article firing chamber rises vertically from the charcoal combustion chamber, and the length direction with respect to the inside of the article firing chamber is equal to the lateral width of the article firing chamber. Connected by a rectangular passage that opens, and a vertical exhaust passage is provided at the center of the rear wall of the furnace body so that the vertical exhaust passage opens at the upper portion of the furnace body. The exhaust port communicating with the chamber and the exhaust channel communicating with the exhaust passage and the article firing chamber at the same lower position A port is provided so as to penetrate horizontally to the exhaust passage, and each exhaust port is formed so as to be able to select communication with and shut off from the exhaust passage by a plug member inserted and removed from the outside of the furnace body. The vertical direction of the exhaust port provided at the bottom and the exhaust port provided at the bottom and the length direction along the width direction of the article firing chamber of the opening facing the article firing chamber of the passage are arranged in a cross shape.

  In the rear wall of the furnace body forming the article firing chamber, a vertical exhaust passage that opens at the top of the furnace body at a central position, and an exhaust passage that horizontally penetrates the rear wall on both sides of the upper portion of the rear wall, Two exhaust ports that communicate with each other and an exhaust port that communicates with the lower end of the exhaust passage are provided at the lower center of the rear wall. Each exhaust port is connected to the exhaust passage by a plug member that is inserted and removed from the outside of the furnace body. Blocking is selected.

As described above, according to the present invention, since the narrow passage for the combustion gas to pass between the charcoal combustion chamber and the article firing chamber is formed, the flow of the combustion gas from the charcoal combustion chamber toward the article firing chamber is reduced. The speed is increased in the narrow passage, the flame of the combustion gas becomes long and reaches the far side of the article firing chamber, the article can be fired at a high temperature, and the firing efficiency for the article can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown, the firing furnace 1a of the present invention is formed in a firing furnace of the lateral to be used for firing the ceramic with charcoal A fuel.

The firing furnace 1a is internally forms a furnace body 22 made of an article firing chamber 21 with a long oblong rectangular back and forth with the refractory material, coal combustion chamber in a lower position at the front wall 23 of the furnace body 22 24 A plurality of upper and lower exhaust ports 26 and 27 can be opened and closed on the rear wall 25 of the furnace body 22, and the combustion gas passes through the upper part of the charcoal combustion chamber 24 and the lower front end of the article firing chamber 21. It is structured to be connected by a narrow passage 28 for this purpose.

The charcoal combustion chamber 24 is formed hollow inside using a refractory material at the lower part of the front wall 23 of the furnace body 22, and the charcoal supply port 29 opened at the lower front surface of the front wall 23 of the furnace body 22 is provided with a lid member 30. The charcoal combustion chamber 24 has a structure in which an air supply port 32 that can be opened and closed by a plug member 31 is provided in the lower part of the front surface of the charcoal combustion chamber 24, and a rooster 33 is disposed inside the charcoal combustion chamber 24.

The narrow passage 28 connecting the charcoal combustion chamber 24 and the article firing chamber 21 is a rectangular vertical passage that rises vertically from the upper end of the charcoal combustion chamber 24. As shown in FIGS. 2 and 3, the upper end of the narrow passage 28 opens to the article baking chamber 21 with a length equal to the lateral width with respect to the inside of the article baking chamber 21.

  The rear wall 25 of the furnace body 22 is provided such that a vertical exhaust passage 34 is opened at the center of the upper portion of the furnace body 22, and two exhaust passages communicating with the exhaust passage 34 are provided on both sides of the upper portion of the rear wall 25. An exhaust port 26 and an exhaust port 27 communicating with the lower end of the exhaust passage 34 are provided horizontally through the lower center of the rear wall 25. These exhaust ports 26, 27 are plugs that are inserted and removed from the outside of the furnace body 22. By the member 35, communication and blocking of the exhaust passage 34 are selected.

  In the case of illustration, the furnace main body 22 can increase the volume of the article baking chamber 21 by stacking and assembling the bottomed base frame 22a, the upper frame 22b, and the lid member 22c, and stacking the upper frames 22b by the required number. An example is shown.

The upper end opening of the narrow passage 28 connecting the charcoal combustion chamber 24 and the article firing chamber 21 opens in a horizontal state below the article firing chamber 21, and the planar length direction of the upper end opening of the narrow passage 28 The vertical direction of the exhaust ports 26 and 27 is arranged in a cross shape.

The firing furnace 1a of the present invention is configured as described above. Next, a method for firing an article using the firing furnace 1a will be described.

Placed on grate 33 by introducing the coal A predetermined amount into the combustion chamber 24 of the coal, previously housed the article (not shown) firing cent article firing chamber 21 of the furnace body 22.

  When the charcoal A is ignited and burned in this state, the air flowing in from the air supply port 32 is supplied as primary air from the bottom of the rooster 33 and as secondary air from the top of the rooster 33, and the combustion gas flows in the vertical narrow passage 28. After passing, the gas flows toward the article firing chamber 21 of the furnace body 22.

Thus, when the narrow passage 28 is formed in the middle of the flow path of the combustion gas, the combustion gas is squeezed by the narrow passage 28 to increase the flow velocity, and the flame is well extended to reach the far side of the article firing chamber 21. It becomes also the combustion gas by a narrow passage 28 without going back to the combustion chamber 24 of the lower coal, thereby improving the firing efficiency of the article.

Further, when the article baking chamber 21 is heated, since the planar length direction of the upper end opening of the narrow passage 28 and the vertical direction of the exhaust ports 26 and 27 are arranged in a cross shape, the upper and lower exhaust ports 26, By selecting the opening / closing of 27, the flow path of the combustion gas flowing toward the article firing chamber 21 of the furnace body 22 can be adjusted.

In FIG. 1 , when the upper exhaust port 26 communicates with the exhaust passage 34 and the lower exhaust port 27 is closed, the combustion gas flowing into the article firing chamber 21 from the narrow passage 28 is as shown by an arrow a in FIG. In addition, the flow proceeds from the upper part of the article baking chamber 21 to the upper exhaust port 26, and the upper part of the article baking chamber 21 is heated to be in a state suitable for the initial stage of baking.

  Further, when the lower exhaust port 27 communicates with the exhaust passage 34 and the upper exhaust port 26 is closed, the combustion gas flowing into the article firing chamber 21 from the narrow passage 28 is as shown by an arrow b in FIG. It becomes a flow from the upper part of the article baking chamber 21 toward the lower exhaust port 27, whereby the flow path becomes longer, the stagnant time of the combustion gas is set longer, and the thermal efficiency is improved, It will be in direct contact with the article stored in the article firing chamber 21, and the article can be fired at a high temperature.

Temperature of the article firing chamber 21 by the combustion gas can be carried out by adjusting the amount of coal A to be introduced into the combustion chamber 24, the opening amount of the air supply port 32 and the exhaust port 26 and 27, no釉物products It is possible to perform baking, reduction firing of articles with carbon monoxide, and the like.

In the above embodiment, an article to be fired has been exemplified ceramics, for example, can also be used for firing the forging workpiece.

Longitudinal front view showing a firing furnace according to the present invention (A) is a rear view showing a firing furnace according to the present invention, (B) is a plan view of the same part cut out (A) is a cross-sectional plan view along arrow AA in FIG. 1, (B) is a cross-sectional plan view along arrow BB in FIG.

Explanation of symbols

21 Combustion chamber 22 Furnace body 23 Front wall 24 Combustion chamber 25 Rear wall 26 Exhaust port 27 Exhaust port 28 Narrow passage 29 Charcoal supply port 30 Lid member 31 Plug member 32 Air supply port 33 Rooster 36 Exhaust passage 35 Plug member A Charcoal

Claims (1)

A furnace body (22) having a horizontally-long square shape, including a front wall (23) at a front portion serving as one end and a rear wall (25) at a rear portion serving as the other end, and the inside serving as an article firing chamber (21);
An internal hollow charcoal combustion chamber (24) provided at a position below the front wall (23) with respect to the furnace body (22),
In order to allow combustion gas to pass from the charcoal combustion chamber (24) to the article firing chamber (21), the upper wall of the charcoal combustion chamber (24) and the interior of the article firing chamber (21) are placed on the front wall (23). The lower position in contact with the charcoal combustion chamber (24) rises vertically from the charcoal combustion chamber (24) and opens in the length direction equal to the lateral width of the article firing chamber (21) with respect to the interior of the article firing chamber (21). Connected by a square passage (28)
In the rear wall (25) of the furnace body (22), a vertical exhaust passage (34) is provided at a central position so as to open at the top of the furnace body (22),
An exhaust port (26) communicating with the exhaust passage (34) and the article firing chamber (21) is provided at the upper part of the rear wall (25), and the exhaust passage (34) and article firing chamber (21) are provided at the lower position. An exhaust port (27) that extends horizontally with respect to the exhaust passage (34),
These exhaust ports (26) and (27) are formed so as to be able to select communication and blocking with the exhaust passage (34) by a plug member (35) that is inserted and removed from the outside of the furnace body (22),
The vertical and vertical directions of the exhaust port (26) provided in the upper part and the exhaust port (27) provided in the lower part of the article firing chamber (21) having an opening facing the article firing chamber (21) of the passage (28). A firing furnace in which the length direction along the width direction is arranged in a cross shape.

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