JP3029560B2 - Furnace air agitator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace such as an electric furnace or a hot air circulating furnace or a drying furnace, in which the heating air in the furnace is efficiently heated or dried. The present invention relates to an improvement in an in-furnace air stirring device for forcibly stirring or circulating.

[0002]

2. Description of the Related Art FIG. 5 is a schematic explanatory view of a conventional in-furnace air stirrer. In this embodiment, a fan 43 having a plurality of blades is fixed to the tip of a rotary drive shaft 42 of the electric motor 41. The heated air rising toward the ceiling 40 in the furnace is forcibly sent back downward by the rotating fan 43,
The air in the furnace is stirred or circulated.

[0003]

In this conventional in-furnace air stirring apparatus, the in-furnace air is simply stirred or circulated only by rotation of an axial fan provided with a plurality of blades. It ’s primitive,
The stirring efficiency or circulation efficiency was extremely low.
In view of the above, an object of the present invention is to provide a device capable of forcibly stirring or circulating heated air in a furnace, and to provide a device having extremely high stirring or circulation efficiency.

[0004]

According to a first aspect of the present invention, there is provided a heating furnace or a drying furnace which is provided in a furnace such as a heating furnace or a drying furnace and agitates air in the furnace. The air agitator includes an impeller 2 fixed to a drive shaft 1 for transmitting a rotational force from a drive source, and a housing 5 for housing the impeller 2 therein.
An air inlet 12 is provided at an end of the drive shaft 1 opposite to the drive source, and an annular air outlet 15 is provided at a predetermined interval for discharging air from a position outside the air inlet 12. Air is supplied to the annular air discharge port 15
An air guide passage extending in the discharge direction of the air is formed , and the heated air in the furnace sucked from the air inlet 12 is supplied to the air.
-Spiral discharge from the air discharge port 15 in a diagonally outward direction on the side of the suction port 12 . Thereby, when the stirring device according to the present invention is mounted on the ceiling in the furnace, the air in the furnace is sucked from the air suction port 12 having the downward opening, and is discharged from the air discharge port 15 in a spiral diagonally downward direction. Then, the furnace air is forcibly stirred or circulated, and the heat circulation or heat transfer efficiency of the furnace air is improved. According to a second aspect of the present invention, in the first aspect, the housing 5 is provided with a discharge port adjusting member 20 capable of adjusting the interval between the air discharge ports 15 in a wide and narrow manner. Thereby, the wind speed of the discharge air can be adjusted.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 of the accompanying drawings illustrate an embodiment of the present invention.
FIG. 1 is an overall sectional explanatory view of a stirring device according to the present invention. The upper end of the drive shaft 1 for transmitting the rotational force in the figure is connected to an electric motor, not shown, and the lower end is fixed to the impeller 2. The impeller 2 is for a centrifugal fan, and uses what is generally called a turbo fan. The plurality of blades provided on the impeller 2 extend outward or radially or spirally around the drive shaft 1.

A housing 5 for housing the impeller 2 therein includes an outer member 6 and an inner member 7, and the outer member 6 and the inner member 7 are fixed by an inner fixing plate 8. The fixing plate 8 is a donut-shaped disk, in which a large number of air insertion holes 10 are provided over the entire surface, the outer periphery of which is welded to the outer member 6, and the inner member of which is attached to the inner member. 7 is screwed. An air inlet 12 is provided at a substantially central portion of the inner member 7 of the housing 5, that is, at an end of the drive shaft 1 opposite to the drive source.
Therefore, the air inlet 12 is located at the lower end of the drive shaft 1 when the stirring device is installed on the ceiling in the furnace. The stirrer according to the invention of the present application can be freely attached to other wall surfaces in accordance with the structure of the heating furnace or the like, as well as the ceiling in the furnace. On the other hand, the air discharge port 15 is connected to the peripheral portion 16 of the outer member 6 of the housing 5.
And the gap between the inner member 7 and the outer peripheral edge 17.

In this embodiment, the discharge port adjusting member 2 for adjusting the width of the interval between the discharge ports 15 to be freely and narrowly.
0 is further added. The discharge port adjusting member 20 has a stepped cylindrical shape having an opening in the center, and is screwed to the female screw portion 9 planted in the inner member 7 of the housing 5 by a thumb screw 21. I have. In addition, a coil spring 25 is interposed around the female screw portion 9, and the coil spring 25 constantly urges the discharge port adjusting member 20 outward (downward in the figure). Thus, by loosening the thumbscrew 21, the discharge port adjusting member 20 moves outward, and the discharge port 1
The interval width of 5 is widened. In this embodiment, four thumb screws 21 are used to fix the discharge port adjusting member 20 to the inner member 7 of the housing 5 at four locations.

As described above, the air discharge port 15 is formed by the space between the peripheral portion 16 of the outer member 6 and the outer peripheral portion 22 of the discharge port adjusting member 20. The hanging part 2 of the outer member 6
6 and the hanging portion 27 of the inner member 7 form an air guide passage, so that the sucked air can be efficiently guided downward. Further, the peripheral portion 16 forming the leading edge of the hanging portion 26 and the outer peripheral portion 22 of the discharge port adjusting member 20 extend in parallel to each other by a predetermined length in the air discharge direction to form an air guide passage. doing. Directivity is given to the air by the guide passage for this fixed length.

Although a plan view of the stirring device viewed from above is not shown, it shows the outer shape of the outer member 6 of the housing 5 and has a circular shape. Therefore, the overall external shape of the stirring device according to the present invention has a circular shape with a thickness in which the impeller 2 is housed, and a lower portion of the peripheral portion extends downward over the entire circumference. It will have a shape having a portion. The discharge port 15 is located over the entire periphery of the outer periphery of the lower end of the annular protrusion. The heated air in the furnace according to the above configuration is sucked from the air suction port 12 provided at the center of the lower surface of the stirring device as shown by the arrow in the figure, and is pressure-fed in the circumferential direction by the action of the impeller 2. Is guided by the outer member 6 of the housing 5 and the discharge port adjusting member 20, and is forcibly discharged in a diagonally downward spiral form from the discharge ports 15 located all around the outer peripheral lower part of the stirrer.

Here, the position of the air discharge port and the direction of the guide path of the discharge port are not limited to the above embodiment, and the design can be freely changed. For example, the hanging portion 26 of the outer member 6 can be implemented without being provided, and an air discharge port can be provided at an appropriate position on the outer peripheral portion 18 of the outer member 6. By directing the guide passage obliquely downward at this position, the discharge air can be spirally discharged obliquely downward. Also, the air discharge port does not necessarily have to be provided in a ring shape as in the above-described embodiment over the entire circumference, and there is a portion such as a partition portion where air is not discharged such as a partition in a part of the ring-shaped opening. Is also good. In this way, the position of the air discharge port may be located outside the air intake port 12 located at the center lower part, and the annular opening can be implemented even if it does not open over the entirety, What is necessary is just to comprise so that it may discharge spirally in the diagonally downward direction.

FIG. 2 is a partial cross-sectional explanatory view showing a state in which the discharge port adjusting member 20 is moved downward in the drawing to widen the interval between the discharge ports 15. By appropriately loosening the respective thumb screws 21, the discharge port adjusting member 20 moves downward by the action of the coil spring 25. As a result, the interval between the discharge ports, that is, the peripheral portion 16 of the outer member 6 and the discharge port adjusting member 2
Thus, the width of the space between the outer peripheral portion 22 and the outer peripheral portion 22 is increased. Conversely, when the thumb screw 21 is tightened, the state shifts to the state shown in FIG. 1 and the width of the interval between the discharge ports 15 is adjusted to be narrow. By this adjustment, the wind speed of the discharge air can be controlled. In this embodiment, the discharge port adjusting member 20 has a deep dish shape with a circular hole at the center, and is screwed to the inner member 7 of the housing via a coil spring 25 with a thumb screw 21. However, the present invention is not limited to this configuration, and can be implemented without using a thumb screw, a coil spring, or the like.

FIG. 3 is a partially sectional explanatory view showing another embodiment of the discharge port adjusting member. The discharge port adjusting member 30 has a substantially cylindrical shape, and has a lower end extended outward. An appropriate number of screw insertion holes 31 are provided near the upper end of the discharge port adjusting member 30. The screw insertion hole 31 is formed as a long hole that is long in the vertical direction in the figure. Then, the discharge port adjusting member 30 is screwed into a screw hole provided in the inner member 7 of the housing 5 by a screw 32 and fixed. At this time, since the screw insertion hole 31 is formed as a long hole, the discharge port adjusting member 30 can be moved up and down in the figure. By this vertical movement, the width of the interval between the discharge ports 15 can be freely adjusted. This discharge port adjusting member can be implemented in various shapes,
It is also possible to carry out the present invention by attaching it to the outer peripheral surface of the outer member 6 of the housing 5, and various design changes can be made.

FIG. 4 is an explanatory view showing a state in which the stirring device 35 according to the present invention is installed in a furnace. K indicates the inside of the furnace, and the outer member 6 of the housing 5 can be fixed and attached to the ceiling 40 of the furnace. When the electric motor 41 is started, the impeller in the apparatus rotates, and the heated air in the furnace is sucked from the air suction port at the center of the lower surface of the apparatus (arrow A), and is forcibly heated obliquely downward from the discharge port 15. The air is blown out (arrow B), and the discharge air is the arrow C as a whole.
As shown in (2), the flow becomes a spiral flow that spreads downward, and is stirred or circulated throughout the entire furnace. Thereby, the heat circulation or heat transfer efficiency in the furnace was improved, and the heating efficiency or the drying efficiency could be greatly increased as compared with the conventional heating furnace, drying furnace and the like.

Although the embodiment has been described above, the present invention is characterized in that air inside the furnace is sucked in from the lower central part of the apparatus and swirled obliquely downward from the outer peripheral part of the apparatus. Any shape can be used as long as it can forcibly discharge the sucked air, and the shape, size, material and the like of the apparatus can be freely changed. For example, in the above-described embodiment, the discharge port 15 is provided on the outer peripheral portion of the annular protruding portion that extends the outer peripheral portion of the housing 5 downward, but it is not necessary to provide the downwardly extending portion. A discharge port may be provided at an appropriate position on the thick disk-shaped outer peripheral portion, and air may be discharged obliquely downward from this portion. The discharge port adjusting member can also be variously changed in design, and can be provided on the outer peripheral portion of the outer member of the housing. This discharge port adjusting member can be embodied without being provided, and the air discharge port can be freely formed fixedly by both peripheral portions of the outer member and the inner member of the housing.

[0015]

The present invention having the above configuration has the following effects. In the first aspect of the present invention,
The ascending heated air inside the furnace is sucked in from the central inlet, and the sucked heated air can be discharged in a spiral diagonally downward, forcibly stirring or circulating the air inside the furnace. As a result, the heat circulation or heat transfer of the air in the furnace was extremely effectively promoted, and the heating efficiency and the drying efficiency were dramatically improved. In a second aspect of the present invention,
Since the discharge port adjusting member that can adjust the interval between the air discharge ports can be freely adjusted, the wind speed of the discharge air can be adjusted as needed. This makes it possible to adjust the interval between the discharge ports appropriately in accordance with the volume in the furnace or the like. As described above, the present invention has a simple configuration and exerts a great effect.

[Brief description of the drawings]

FIG. 1 is an overall sectional explanatory view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional explanatory view showing an embodiment of the present invention, and shows a state in which an interval between discharge ports is widened.

FIG. 3 is a partial cross-sectional explanatory view showing an embodiment of the present invention, and shows another mode of a discharge port adjusting member.

FIG. 4 is an explanatory view showing a state in which the apparatus according to the present invention is installed in a furnace, and illustrates a flow of air in the furnace.

FIG. 5 is an explanatory view showing a conventional in-furnace air stirring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Impeller 5 Housing 6 Outer member 7 Inner member 12 Air suction port 15 Air discharge port 20, 30 Discharge port adjusting member

Claims (2)

(57) [Claims] An oven provided in a furnace such as a heating oven or a drying oven.
Is fixed to the drive shaft (1) that transmits the rotational force from the drive source in the furnace air stirring device that stirs the air inside
The impeller (2) and the housing that houses the impeller (2)
The housing (5) has a housing (5) opposite to the drive source of the drive shaft (1).
The air inlet (12) opening to the end side and the air inlet (1
2) Discharge air from outside positionAnnular at predetermined intervals
ofAn air discharge port (15) is provided,This annular air discharge port (15)
An extended air guide passage is formed,  Heated air in the furnace sucked from the air inlet (12), D
Diagonally outward on the side of the air inlet (12)Air outlet (15)
The air in the furnace is discharged from the furnace in a spiral shape
Stirrer. 2. The in-furnace air agitator according to claim 1, wherein a discharge port adjusting member (20) capable of adjusting the distance between the air discharge ports (15) to be wide and narrow is attached to the housing (5). .