JPH0989241A - Furnace air agitating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To forcedly and efficiently agitate or circulate a heated air in a heating furnace or the like. SOLUTION: A drive shaft 1 has its one end connected to a rotary drive source and secures to its other end an impeller 2. Provided centrally in a lower portion, as viewed in the drawing, of a housing 5, which receives the impeller 2, is an air suction port 12, outside of which is provided an air discharge port 15 in an annular manner. An adjusting member 20 for the air discharge port is mounted to an inner member 7 of the housing by means of thumbscrews 21, which are driven or loosened to permit coil springs 25 to freely adjust a size of a spacing in the air discharge port 15. An air in a furnace is sucked from the air suction port 12 to be pressure fed by revolution of the impeller 2 to be forcedly spirally discharged downwardly and obliquely from the air discharge port 15, which is provided annularly in an outer peripheral portion of the housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently heats air in a furnace in order to effectively heat or dry a product contained in a heating furnace such as an electric furnace or a hot air circulating furnace or a drying furnace. The present invention relates to improvement of 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 agitator, in which K indicates the inside of the furnace, an electric motor 41 is installed on the upper surface of the ceiling 40 of the furnace, that is, outside the furnace. The fan 43 having a plurality of blades is simply fixed to the tip of the rotary drive shaft 42 of the electric motor 41. The rotating fan 43 forcibly sends back the heated air rising toward the ceiling portion 40 in the furnace downward,
The air in the furnace is agitated or circulated.

[0003]

In this conventional in-furnace air agitator, the in-furnace air is agitated or circulated only by the rotation of an axial fan provided with a plurality of blades. It ’s a primitive one,
The stirring efficiency or circulation efficiency was extremely low.
Therefore, in the present invention, it is an object of the present invention to provide a heating air in the furnace that can be forcibly stirred or circulated, and to provide a heating air having extremely high stirring or circulation efficiency.

[0004]

In order to solve the above problems, in the first aspect of the present invention, the inside of a furnace provided in a furnace such as a heating furnace or a drying furnace for stirring air in the furnace The air agitator includes an impeller 2 fixed to a drive shaft 1 that transmits a rotational force from a drive source, and a housing 5 that houses the impeller 2 therein.
Is provided with an air suction port 12 that opens to the end side opposite to the drive source of the drive shaft 1, and an air discharge port 15 that discharges air from a position outside the air suction port 12. The heated air in the furnace sucked in from the air is discharged radially or spirally from the air discharge port 15. According to a second aspect of the present invention, in the first aspect of the invention, the air discharge port 15 is provided in an annular shape, and the in-furnace air is discharged from the entire circumference of the annular air discharge port 15. As a result, when the stirring device according to the present invention is attached to the ceiling of the furnace, the air in the furnace is sucked in through the air inlet 12 having the downward opening, and radially in the lateral direction from the air outlet 15, or The air in the furnace is obliquely discharged downward, and the air in the furnace is forcibly stirred or circulated, and the heat circulation or heat transfer efficiency of the air in the furnace is improved. According to a third aspect of the present invention, in the first or second aspect of the invention, 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. 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 embodiments of the present invention.
FIG. 1 is an overall cross-sectional explanatory view of a stirring device according to the present invention. Although not shown, the upper end of the drive shaft 1 that transmits the rotational force 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 is generally called a turbo fan. A plurality of blades provided on the impeller 2 extend radially or spirally outwardly around the drive shaft 1.

A housing 5 for accommodating the impeller 2 is composed of 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 disc, and is provided with a large number of air insertion holes 10 all over the surface thereof, the outer peripheral portion of which is welded to the outer member 6, and the inner peripheral portion of the inner member. 7 is screwed on. An air intake port 12 is provided at a substantially central portion of the inner member 7 of the housing 5, that is, at an end portion side of the drive shaft 1 opposite to the drive source.
Therefore, the air suction port 12 is located on the lower end side of the drive shaft 1 when the stirring device is installed on the ceiling part in the furnace. The stirrer according to the present invention is not limited to the ceiling part in the furnace, and can be attached to other wall surfaces by adapting to the structure of a heating furnace or the like. On the other hand, the air outlet 15 is provided at the peripheral portion 16 of the outer member 6 of the housing 5.
And the outer peripheral edge portion 17 of the inner member 7 is formed.

In this embodiment, the discharge port adjusting member 2 for adjusting the space between the discharge ports 15 to be wide and narrow.
0 is further added. The discharge port adjusting member 20 has a stepped tubular shape having an opening in the center, and is screwed by a thumbscrew 21 to a female screw portion 9 planted in the inner member 7 of the housing 5. There is. In addition, the coil spring 25 is interposed around the female screw portion 9, and the coil spring 25 constantly biases the discharge port adjusting member 20 in the outward direction (downward direction in the drawing). As a result, 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 thumbscrews 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 edge portion 16 of the outer member 6 and the outer peripheral edge portion 22 of the discharge port adjusting member 20. Also, 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, and the sucked air can be efficiently guided downward. Further, the peripheral edge portion 16 forming the tip edge of the hanging portion 26 and the outer peripheral edge portion 22 of the discharge port adjusting member 20 extend in parallel to each other by a certain length in the air discharge direction to form an air guide passage. are doing. The direction of the air is imparted by the guide passage of this fixed length.

Although not shown in the drawing, a plan view of this agitator viewed from above shows the outer shape of the outer member 6 of the housing 5 and has a circular shape. Therefore, the overall outer 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 the lower portion of the peripheral portion thereof has an annular projection extending downward over the entire circumference. The shape will have a part. The discharge port 15 is located at the outer peripheral portion of the lower end of the annular projection over the entire circumference thereof. With the above configuration, the heated air in the furnace is sucked from the air suction port 12 provided in the central portion of the lower surface of the stirring device and is pressure-fed in the circumferential direction by the action of the impeller 2, as shown by the arrow in the figure. It is guided by the outer member 6 of the housing 5 and the discharge port adjusting member 20, and is forcibly discharged spirally downward from the discharge port 15 located around the entire lower peripheral portion of the stirring device.

Here, the position of the air discharge port, the direction of the guide passage of the discharge port, and the like are not limited to those in 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 the air discharge port can be provided at an appropriate position on the outer peripheral portion 18 of the outer member 6. At this position, the discharge air can be discharged radially in the horizontal direction, or the discharge air can be discharged spirally in the oblique downward direction by directing the guide passage in the oblique downward direction. Also, the air outlet is
As in the above-described embodiment, it is not always required to be provided in an annular shape over the entire circumference thereof, and there may be a portion such as a partition portion where air is not discharged, in a part of the annular opening portion. In this way, the position of the air discharge port may be located outside the air suction port 12 located in the lower central portion, and the annular opening portion can be implemented even if it is not opened over the whole, The ejected air may be configured to be ejected radially in the lateral direction or spirally in the obliquely 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 intervals between the discharge ports 15. By appropriately loosening each thumbscrew 21, the discharge port adjusting member 20 is moved downward by the action of the coil spring 25. Thereby, the space between the discharge ports, that is, the peripheral edge portion 16 of the outer member 6 and the discharge port adjusting member 2
The width of the space between the outer peripheral edge portion 22 and 0 is increased. On the contrary, when the thumbscrew 21 is tightened, it shifts to the state of FIG. 1 and the interval width of the discharge ports 15 is adjusted to be narrow. By this adjustment, it is possible to control the speed of the discharged air and the like. In this embodiment, the discharge port adjusting member 20 has a deep dish shape with a circular hole in the center, and this is screwed to the inner member 7 of the housing via the coil spring 25 with the thumbscrew 21. However, the present invention can be implemented without using such a configuration and without using a thumbscrew, a coil spring, or the like.

FIG. 3 is a partial cross-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 portion that extends 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 drawing. Then, the discharge port adjusting member 30 is screwed into the screw hole provided in the inner member 7 of the housing 5 by the 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 interval width of the ejection ports 15 can be freely adjusted. This outlet adjustment member can be implemented in various shapes,
It is also possible to mount it on 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 stirrer 35 according to the present invention is installed in the 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 device rotates, and the heated air in the furnace is sucked from the air intake port at the center of the lower surface of the device (arrow A), and is forcibly heated obliquely downward from the discharge port 15. The air is blown out (arrow B), and the discharge air as a whole is arrow C.
As shown in (1), a spiral flow that spreads downward is formed, and the mixture is agitated or circulated throughout the furnace. As a result, the heat circulation or heat transfer efficiency in the furnace was improved, and the heating efficiency or drying efficiency could be significantly increased compared to the conventional heating furnace or drying furnace.

Although the embodiment has been described above, the feature of the present invention is that the in-furnace air is sucked in from the lower central portion of the apparatus and is laterally (horizontally) from the outer peripheral portion of the apparatus. Alternatively, it is only necessary to forcibly discharge the sucked air radially or spirally in the oblique downward direction, and the shape, size, material, etc. of the device can be freely designed and changed. For example, in the above-described embodiment, the discharge port 15 is provided at the outer peripheral portion of the annular protrusion that extends downward from the outer peripheral portion of the housing 5, but it is not necessary to provide this downwardly extending portion. An ejection port may be provided at an appropriate position on the thick disk-shaped outer peripheral portion, and air may be ejected laterally or obliquely downward from this portion. It is also possible to install a number of guide plates in a row in the guide passage of the air discharge port so as to be orthogonal to the air discharge port, so that the air is not discharged spirally but linearly and radially in the outward direction. Will be discharged. The design of the discharge port adjusting member can be changed in various ways, and it can be provided on the outer peripheral portion of the outer member of the housing. This discharge port adjusting member can be carried out without being provided in particular, and the air discharge port can be fixedly formed by the outer peripheral member and the inner peripheral member of the housing.

[0015]

The present invention having the above-mentioned structure has the following effects. In the first and second aspects of the present invention, rising heated in-furnace air is sucked through the central suction port, and the sucked heated air is radiated laterally outward or obliquely downward. Can be spirally discharged in the direction, and the air in the furnace is forcibly stirred or circulated,
Very effectively promotes heat circulation or heat transfer of the air in the furnace,
We were able to dramatically improve heating efficiency and drying efficiency. In the third aspect of the present invention, since the discharge port adjusting member capable of adjusting the space between the air discharge ports to be wide and narrow is attached, the wind speed of the discharge air can be adjusted as necessary. As a result, it is possible to appropriately adjust the distance between the discharge ports according to the volume of the furnace and the like.
As described above, the present invention has a simple configuration and exerts a great effect.

[Brief description of drawings]

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

FIG. 2 is a partial cross-sectional explanatory view showing the embodiment of the present invention, showing a state in which the intervals of the ejection ports are widened.

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

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

FIG. 5 is an explanatory view showing a conventional furnace air agitator.

[Explanation of symbols]

 1 Drive Shaft 2 Impeller 5 Housing 6 Outer Member 7 Inner Member 12 Air Suction Port 15 Air Discharge Ports 20, 30 Discharge Port Adjustment Member

Claims (3)

[Claims] 1. An in-furnace air agitator provided in an oven such as a heating oven or a drying oven and agitating the air in the oven, is fixed to a drive shaft (1) for transmitting a rotational force from a drive source. It is equipped with an impeller (2) and a housing (5) that houses this impeller (2), and this housing (5) has an opening on the end side opposite to the drive source of the drive shaft (1). Air intake (12) and air intake (1
2) Air discharge port (1
5) is provided, and the heated air in the furnace sucked in through the air suction port (12) is discharged radially or spirally from the air discharge port (15) in the furnace. 2. The furnace according to claim 1, wherein the air discharge port (15) is provided in a ring shape, and the air in the furnace is discharged from the entire circumference of the ring-shaped air discharge port (15). Air stirring device. 3. The in-furnace air according to claim 1 or 2, characterized in that a discharge port adjusting member (20) capable of adjusting a space between the air discharge ports (15) to be wide and narrow is attached to the housing (5). Stirrer.