JP2003293998A - Axial flow blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cool a belt and pulleys without lowering the efficiency of an axial flow blower. <P>SOLUTION: In this axial flow blower, a belt 10 is applied from a drive pulley 9 for a motor 8 installed on the outside of a cylindrical casing 1 to a driven pulley 6 for an impeller 7 installed in the cylindrical casing 1 to transmit a rotating power, and the drive pulley 9, the belt 10, and the driven pulley 6 are covered by a belt cover 2. A heat discharge tube 11 leading from near the driven pulley 6 in the belt cover 2 to the outside of the cylindrical casing 1 is provided separately from the portion of the belt cover 2 at least covering the belt 10 so that cool air in the belt cover 2 can be discharged through the heat discharge tube 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various air blow applications (for example, exhaust of contaminated air, atomized paint, various gases, ventilation,
Axial blower used for air supply).

[0002]

2. Description of the Related Art As shown in FIG.
For example, as shown in FIG. 7, an impeller 25 rotatably supported in a substantially central portion of a cylindrical housing 22 is attached to a duct 20 communicating with a hood 21 or the like, and a driving pulley 28 and a belt are driven by a motor 27. By being rotated through 29 and the driven pulley 26 in this order, the contaminated air taken in from the hood 21 is discharged to the outside.

In order to ensure safety and protect the belt 29 from pollution and deterioration due to exhaust air,
A belt cover 23 that covers the drive pulley 28, the belt 29, and the driven pulley 26 and seals them is provided also as a support member that supports the impeller 25.

[0004]

However, in the conventional axial blower 19, although the wind was generated inside the belt cover 23 due to the rotation of the belt 29 (arrow in FIG. 6), The inside of the belt 29 and the drive pulley 2 are closed because the inside is hermetically sealed and air is retained as described above.
The frictional heat between the belt 8 and the driven pulley 26 raises the temperature of the belt 29 and is stored inside the belt cover 23. Further, in order to reduce the air resistance and increase the efficiency of the blower, the belt cover 23 needs to be as thin as possible, and the diameters of the drive pulley 28 and the driven pulley 26 also need to be reduced. Therefore, the belt 29 is deformed with a small radius by the pulleys 28 and 26, and thus deformation heat is generated. This deformation heat also raises the temperature of the belt 29 and is also stored inside the belt cover 23. When the temperature of the belt 29 rises in this way, there is a problem that the life of the belt 29 is shortened and the frequency of replacement is increased.

Therefore, as shown in FIG. 7, a method has also been adopted in which a hole 30 is formed in the outer portion of the cylindrical casing 22 of the belt cover 23 to discharge the heat inside the belt cover 23. There is a limit to the radiation of the frictional heat and the heat associated with the deformation, and the effect on the life of the belt 29 cannot be ignored.

Therefore, an object of the present invention is to solve the above problems,
It is to cool the belt and the pulley without reducing the efficiency of the axial blower.

[0007]

In order to achieve the above object, the axial blower according to the present invention has a blade provided inside a tubular casing from a drive pulley of a motor provided outside the tubular casing. Wrap the belt around the driven pulley of the car to transmit the rotational power,
In an axial blower in which a drive pulley, a belt, and a driven pulley are covered with a belt cover, at least the belt of the belt cover is covered with an exhaust heat passage communicating from the vicinity of the driven pulley inside the belt cover to the outside of the cylindrical casing. It is characterized in that it is provided separately from the portion so that the cooling air inside the belt cover is discharged through the heat exhaust path.

As the motor, a motor with a cooling fan is used which allows cooling air to flow inside the motor and discharges it to the drive pulley side. The discharged cooling air is taken into the belt cover and flows to the driven pulley side. It is preferable.

The belt cover may have a separate or integrated intake portion that is provided outside the cylindrical housing and that takes in the cooling air discharged from the motor with a cooling fan.

It is preferable that the driven pulley is provided with vanes that create a flow of cooling air around the driven pulley toward the exhaust heat passage.

The exhaust heat passage is not particularly limited, but the following two modes can be exemplified. (1) A mode in which the exhaust heat pipe extends from the opening provided near the driven pulley of the belt cover to the outside of the belt cover and reaches the tubular casing. The shape of the exhaust heat pipe is not particularly limited, but it is preferable that the exhaust heat pipe is formed in a cross-sectional streamline with low flow resistance against the axial flow of the blower. The formation direction of the heat exhaust pipe is not particularly limited, but one that extends in the radial direction of the tubular housing can be exemplified, and one that extends in a direction that forms a substantially right angle with the belt cover and one that extends substantially parallel to the belt cover can be exemplified. . The number of exhaust heat pipes is not particularly limited, but is appropriately selected in consideration of the production cost and the effect of exhaust heat. (2) A mode in which an exhaust compartment is formed in a part of the inside of the belt cover separately from the drive pulley of the belt cover and the portion covering the belt.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment in which the present invention is embodied in a forced exhaust axial flow fan of a factory will be described below with reference to FIGS.

The axial blower of the present invention comprises a cylindrical casing 1, an impeller 7, a motor 8 for rotating the impeller 7, and a drive for transmitting the rotational power of the motor 8 to the impeller 7. A pulley 9, a belt 10 and a driven pulley 6 are provided.

The cylindrical housing 1 is formed in a cylindrical shape, and flanges 1a extending in the radial direction are provided at both ends thereof. A cylindrical inner cover 2a is formed in a part of the cylindrical housing 1 so as to penetrate from the substantially central portion of the cylindrical housing 1 to a part of the cylindrical housing 1 and open to the outside of the cylindrical housing 1. And an outer cover 2b formed so as to enclose the opening of the inner cover 2a or the output side of the motor 8 is formed.

A motor 8 is mounted on a pair of mounting portions 1b provided on the outer side of the cylindrical casing 1, and a drive pulley 9 fixed to a rotation shaft of the motor 8 is positioned above the opening of the inner cover 2a. It has become. As the motor 8, a motor with a cooling fan 8a is used which allows cooling air to flow into the motor 8 and discharges it toward the drive pulley 9. The discharged cooling air is taken into the belt cover 2 to drive the driven pulley 6a. It is designed to flow to the side.

The inner end of the inner cover 2a is closed, and a bearing mounting portion 3 having a plane perpendicular to the axial direction of the cylindrical casing 1 is formed on the side near the inner end. Bearing mounting part 3
A shaft 4 extending in the axial direction inside and outside the inner cover 2a is arranged substantially at the center of the inner cover 2a, and is rotatably attached to a substantially frustoconical bearing 5 formed outside the bearing mounting portion 3. .

The shaft 4 inside the inner cover 2a
A driven pulley 6 is attached to the base end of the. The driven pulley 6 is provided with blades 6a that create a flow of cooling air around the driven pulley 6 toward an exhaust heat passage described later.

An impeller 7 is attached to the tip of the shaft 4 extending to the outside of the inner cover 2a. The impeller 7 is provided inside the tubular casing 1 so that the axial direction thereof coincides with that of the tubular casing 1. Further, the impeller 7 is formed with a plurality of (six in the illustrated example) blades 7a.

Further, from the vicinity of the driven pulley 6 inside the belt cover 2, an exhaust heat pipe 11 as an exhaust heat passage communicating with the outside of the cylindrical casing 1 is provided separately from the belt cover 2.
Cooling air inside the belt cover 2 is exhausted through the exhaust heat pipe 11.

The heat exhaust pipe 11 extends from the opening provided in the vicinity of the driven pulley 6 of the inner cover 2a to the outside of the inner cover 2a and reaches the cylindrical casing 1. The heat exhaust pipe 11 is cylindrical so as to be substantially orthogonal to the inner cover 2a. Two of them extend in the radial direction of the housing 1. The outer end of each heat exhaust pipe 11 is connected to the tubular casing 1, and the inside of the heat exhaust pipe 11 is outside the tubular casing 1 by, for example, three holes 1c penetrating the tubular casing 1 at the connection site. Communicating with. Further, the exhaust heat pipe 11 is formed in a cross-sectional streamline with low flow resistance with respect to the axial flow of the blower.

Inside the belt cover 2, a belt 10 is wound around a driving pulley 9 and a driven pulley 6 to transmit rotational power. Therefore, the drive pulley 9, the belt 10 and the driven pulley 6 are in a state of being covered by the belt cover 2.

By using the axial blower as described above, the cooling air generated by the cooling fan 8a built in the motor 8 is discharged to the drive pulley 9 side, and then the inner cover is formed by the outer cover 2b of the belt cover 2. It is taken into the inside of 2a and is made to flow to the driven pulley 6 side. This allows a flow of air around the drive pulley 9, the belt 10 and the driven pulley 6 (arrows in FIGS. 1 to 3), and the drive pulley 9, belt 10 and driven pulley 6 are cooled in that order by cooling air. . The cooling air is then
Since it flows from the inner end to the outer end inside the heat exhaust pipe 11 and is discharged to the outside of the cylindrical casing 1, heat is not stored inside the belt cover 2. Therefore, the temperature of the belt 10 is unlikely to rise and the life of the belt 10 is extended, so that the frequency of replacement is reduced.

Further, since the driven pulley 6 is formed with the blade 6a, when the driven pulley 6 rotates, the blade 6a is rotated.
Also rotates to promote the inflow of the cooling air into the exhaust heat pipe 11, and the exhaust heat effect is enhanced. Furthermore, since the exhaust heat pipe 11 is formed in a cross-sectional streamline with a low flow resistance with respect to the axial flow of the blower, the internal cross-sectional area of the exhaust heat pipe 11 is secured to enhance the exhaust heat effect and the air generated by the exhaust heat pipe 11 is increased. Resistance can be reduced.

Next, FIG. 4 shows a second embodiment of the axial-flow blower, which is different from the first embodiment only in the exhaust heat passage. Therefore, only the difference will be described.

The exhaust heat passage in the present embodiment is an exhaust compartment 12 formed in a part of the inside of the belt cover 2 in place of the exhaust heat pipe 11 of the first embodiment. Outer cover 2b
The inner cover 2a and the inner cover 2a have the same structure as the outer cover 2b shown in FIG.
Partition 13 extending from the upper end to the vicinity of the driven pulley 6
Are formed. Inside the outer cover 2b and the inner cover 2a, a heat radiation section 15 as a portion covering the drive pulley 9 and the belt 10 and an exhaust section 12 separated from the heat radiation section 15 by a partition 13 are formed. ing. The heat radiating section 15 and the exhaust section 12 communicate with each other near the driven pulley 6. In addition, the exhaust compartment 1 of the outer cover 2b
An exhaust port 14 communicating with the outside of the belt cover 2 is provided on the second side.

The axial blower of this embodiment has a heat radiating section 15
The cooling air flowed toward the driven pulley 6 along
The drive pulley 9, the belt 10 and the driven pulley 6 are cooled in that order, and the cooled cooling air flows into the exhaust section 12. In addition, the cooling air after cooling is exhaust section 1
2 flows toward the exhaust port 14, and is discharged from the exhaust port 14 to the outside of the cylindrical housing 1.

Therefore, this embodiment differs from the first embodiment only in the structure of the exhaust heat passage, and is basically the same as the first embodiment. Then, according to this embodiment, the same effect as that of the first embodiment can be obtained.

Next, FIG. 5 shows a third embodiment of the axial-flow blower, which is different from the first embodiment only in the exhaust heat passage. Therefore, only the difference will be described.

In this embodiment, the outer cover 2b is left only in the portion corresponding to the heat radiating section 15, and the portion corresponding to the exhaust section 12 is eliminated. In the axial blower of this embodiment, the cooling air after cooling has the exhaust compartment 12 of the inner cover 2a.
After that, it is discharged from a part of the outer end of the inner cover 2a, and is basically the same as in the first and second embodiments. Then, according to this embodiment, the same effects as those of the first and second embodiments can be obtained.

The present invention is not limited to the above-described embodiment, but may be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows. (1) To change the number of exhaust heat pipes 11 such as one or three or more, or to change the radiation direction in the tubular casing 1. (2) Instead of the partition 13, a pipe extending from the vicinity of the driven pulley 6 to the vicinity of the exhaust port 14 is provided inside the belt cover 2.

[0031]

As described above in detail, according to the axial blower of the present invention, the belt and the pulley can be cooled without reducing the efficiency of the axial blower.

[Brief description of drawings]

FIG. 1 is a perspective view showing an axial blower according to an embodiment of the present invention.

FIG. 2 is a side view showing a coaxial blower.

FIG. 3 is a front view showing a coaxial blower.

FIG. 4 is a side view showing an axial blower according to a second embodiment of the present invention.

FIG. 5 is a side view showing an axial blower according to a third embodiment of the present invention.

FIG. 6 is a schematic view showing an example of use of an axial blower.

FIG. 7 is a perspective view showing a conventional axial flow fan.

[Explanation of symbols]

1 tubular housing 2 belt cover 6 Driven pulley 7 impeller 8 motor 9 Drive pulley 10 belts 11 Exhaust heat pipe as an exhaust heat path

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F04D 29/52 F04D 29/52 EF term (reference) 3H034 AA02 BB02 BB08 BB20 CC03 DD01 EE03 3H035 AA03 AA07 3J049 AA02 BH11 BH13 CA10 3J063 AA40 AB22 BA15 CA10 CB23 CD67 XH05 XH13 XH22 XH42 XH45

Claims (6)

[Claims] 1. A belt is wound around a drive pulley of a motor provided outside a cylindrical housing to a driven pulley of an impeller provided inside the cylindrical housing to transmit rotational power, and the drive pulley and the belt. Also, in the axial blower in which the driven pulley is covered with a belt cover, an exhaust heat path communicating from the vicinity of the driven pulley inside the belt cover to the outside of the cylindrical casing covers the drive pulley and the belt of the belt cover. An axial blower, wherein the cooling air inside the belt cover is exhausted through the exhaust heat passage. 2. As the motor, a motor with a cooling fan is used which allows cooling air to flow inside the motor and discharges it toward the drive pulley. The discharged cooling air is taken inside the belt cover and flows toward the driven pulley. The axial-flow blower according to claim 1, configured as described above. 3. The axial blower according to claim 1, wherein the driven pulley is provided with blades that create a flow of cooling air around the driven pulley toward the exhaust heat passage. 4. The exhaust heat passage is an exhaust heat pipe that extends from the opening provided near the driven pulley of the belt cover to the outside of the belt cover and reaches the cylindrical casing. Axial blower. 5. The axial blower according to claim 4, wherein the exhaust heat pipe is formed in a cross-sectional streamline having a low flow resistance with respect to the axial flow of the blower. 6. The exhaust heat passage is an exhaust compartment formed in a part of the inside of the belt cover separately from a portion of the belt cover covering the drive pulley and the belt. The axial blower described in 2 or 3.