JP3290080B2 - Electric axial blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric axial flow blower for pumping a corrosive gas or a high-temperature gas under pressure.
In particular, the present invention relates to an electric axial flow blower having a high cooling effect of the electric motor.

[0002]

2. Description of the Related Art Conventionally, when an electric motor for driving an impeller is provided in a high-temperature gas in an axial blower for handling a high-temperature gas, the electric motor is insulated according to the gas temperature in order to prevent the motor from burning. When the class is expensive, such as class F or class H, and the motor is provided outside the casing, the casing is bent at a large curvature, and the shaft of the impeller is moved out of the casing, and the impeller is driven by the external motor. A driving method is known. In the case of an axial blower that handles corrosive gas, a method in which an impeller is driven by an electric motor provided outside the casing is used in order to prevent generation of rust or the like in the electric motor.

[0003] However, the method of increasing the insulation class of the motor increases the cost of the apparatus, and even if the insulation class is increased, the motor is always exposed to high-temperature gas, so that the reliability is poor and the maintenance and inspection are difficult. Further, when the motor is provided outside the casing, the structure becomes complicated and the efficiency is reduced.

An axial blower in which an electric motor is provided in a casing so as to be cooled is disclosed in
No. 97799 has been proposed. According to the present invention, as shown in the half sectional view of FIG. 4, an exhaust duct 54 and an intake duct 55 for communicating the inside of a case 52 accommodating the motor 51 and the outside of the casing 53 are provided, and the motor 51 is provided. They are trying to cool.

[0005]

However, according to the above-mentioned prior art, an exhaust duct 54 for communicating the inside of a case 52 provided with an electric motor 51 and the outside of a casing 53 is provided.
And the need to provide the intake duct 55, the structure of the casing 53 becomes complicated, and much production time and cost are required. In addition, since the exhaust duct 54 and the intake duct 55 cannot be effectively cooled unless they are provided at a plurality of locations around the electric motor, they have a very complicated structure and are not practical.

On the other hand, in the case of such an axial blower, there is a case where it is desired to change the static pressure and the air volume in a casing having the same diameter by changing the use conditions or the like. However, in the case of such an axial blower, the specification is usually determined by the rated output of the electric motor. Therefore, it is impossible to increase the rated output of the same electric motor to increase the static pressure and air volume of the blower. for that reason,
In some cases, the entire casing is replaced in order to increase the static pressure and air flow, and in this case, much time and cost are required.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the present application is directed from a central portion to an outer side where a motor can be arranged on a central axis from the outside of a casing. The open motor case is integrally formed with the casing, and an electric motor base on which the electric motor is arranged is provided on the center axis of the casing in the electric motor case. As described above, the structure of the casing that can cool the motor is simplified by integrally molding the motor case with the casing. If the motor mount is provided in the motor case that is opened outward from the center of the casing, the motor can be moved to the center of the casing. It can be easily arranged on a shaft.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to the present application is to integrally form an electric motor case which is opened from the center to the outside so that the electric motor can be arranged on the central axis from the outside of the casing. Further, an electric motor base on which the electric motor is arranged is provided on the center axis of the casing in the electric motor case. As described above, the structure of the casing that can cool the motor can be simplified by integrally molding the motor case that is opened from the center part to the outside with the casing. If the motor case is provided in this motor case, the motor can be positioned at the center of the casing. It can be easily arranged on a shaft.

If the motor frame is provided with a partition wall for preventing cooling air from flowing from the discharge side to the suction side, it is possible to prevent cooling air flowing from the discharge side at the rear of the motor from flowing to the suction side. .

Further, if the motor mount is detachably provided from the casing, the static pressure and air volume can be increased by using the same casing by changing the motor by removing the motor mount from the casing.

Further, if the flanges are integrally formed at both ends of the casing, the entire casing can be integrally formed, so that the structure is further simplified.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a drawing showing one embodiment of an electric axial flow blower of the invention according to the present application, wherein (a) is a side sectional view, (b) is a front view, and (c) is an AA sectional view. .

As shown in the figure, an electric motor case opened from the center to the outside so that the electric motor M can be arranged on the central axis c from outside the casing 1 at a substantially central portion of the casing 1. 2 are integrally formed. The shape of the motor case 2 is such that the side on which the impeller 3 which is the discharge side o of the cooling wind w is provided is formed on a surface substantially orthogonal to the casing central axis c, and the anti-impeller side which is the suction side i of the cooling wind w. The casing 1 is formed with an inclined surface that gently spreads outward from the center portion. The axial direction of the casing 1 is longer than the length of the motor M, the width direction is wider than the width of the motor M, and the depth direction is the motor. It is formed so as to draw an arc that is larger than the radius of M and does not come into contact with the electric motor M.

The motor case 2 is connected to the casing 1
If it is integrally formed, the structure of the casing 1 can be simplified, and the productivity of the casing 1 can be increased. Moreover, in this embodiment, since the flanges 1a at both ends are also integrally formed, the productivity can be further increased. The material of the casing 1 to be integrally molded may be a fiber reinforced plastic (FR) from the viewpoint of heat resistance, strength, or productivity.
Composite materials such as P) are preferred.

The casing 1 is provided with an electric motor base 4 on which the electric motor M can be disposed on the casing center axis c in the electric motor case 2 with the electric motor case 2 opened downward. In the motor mount 4, a motor mount plate 4a for mounting the motor M and a mount mount plate 4b for mounting on the casing 1 are connected by a connecting plate 4c, and the motor mount 4 is connected to the opening 2a of the motor case 2 by the mount mount plate 4a. It is attached to a flange 1 b provided on the outer surface of the continuous casing 1. This motor mount 4
Is formed at a height such that the axial center of the electric motor M is positioned on the center axis c of the casing when attached to the flange 1b. According to the motor mount 4 thus formed, the motor M can be easily mounted on the casing center axis c from the opening 2a of the motor case 2 integrally formed with the casing 1. That is, if the motor M is mounted on the motor base 4 in advance, and the motor base 4 is provided on the motor case 2 of the integrally formed casing 1, the motor M can be easily disposed on the casing center axis c. Complete. The shaft M protruding from the motor case 2
If the impeller 3 is attached to a, the assembly of the electric axial flow blower V is completed. Note that Mb is a seal member of the shaft Ma.

In this embodiment, the motor mount 4
Is provided with a partition wall 5 for preventing the flow of the cooling air w in the axial direction of the motor, and the partition wall 5 is configured to prevent the flow of the cooling air w in the axial direction of the motor in the motor case 2. . In this embodiment, the partition 5 is the motor mounting plate 4.
a to approximately the outer surface position of the casing 1. Therefore, the cooling air w flowing from the suction side i, which is the rear part of the motor M, to the discharge side o, which is the front part of the motor M, does not flow again to the suction side i. In addition, since the cooling air w which has come out to the outer surface of the casing 1 mixes with the surrounding air, the air temperature on the suction side i does not increase.

Further, in this embodiment, the partition wall 5 is provided between the motor mounting plate 4a and the mounting plate 4b for reducing the weight of the motor mounting 4, but the suction side i depends on the shape of the motor mounting 4. And the discharge side o.
The configuration of the partition 5 is not limited to the above embodiment.

According to the electric axial blower V configured as described above, the electric motor M can be cooled by the following operation.

That is, when the impeller 3 is driven by the motor M provided on the center axis c of the casing by the motor mount 4, air flows through the outer fan Mc provided in the motor M, and this air flow is generated. Electric motor M as cooling air w
To cool. The cooling air w is sucked from the suction side i by the external fan Mc provided at the rear of the electric motor M at a substantially normal temperature state, and becomes a large flow exiting from the front discharge side o through the outer surface of the electric motor M. The cooling air w sucked from the opening 2a of the motor case 2, which is largely opened to provide the motor M, flows through the motor case 2 through a flow path having a sufficient space.
The electric motor M inside can be cooled effectively. In addition, the loss due to the cooling air flow passage in the motor case 2 is small.

FIG. 2 is a diagram showing a measurement result of the temperature inside the motor case in the electric axial flow blower V. According to the measurement result, after about 30 minutes have passed, the suction temperature becomes lower than the atmospheric temperature. A rise of about 3 ° C on the side i and a rise of about 3 ° C on the discharge side o are observed, and after about 120 minutes, the rise of about 4 ° C on the suction side i and about 5 ° C on the discharge side o is higher than the atmospheric temperature Can be seen.
Therefore, it is understood that there is a cooling effect that the motor M can be sufficiently cooled without greatly increasing the temperature around the motor. If such cooling is performed with a sufficient amount of cooling air, thermal deterioration of the bearing grease, poor lubrication, seizure of the bearing, and the like can be reliably prevented.

FIG. 3 shows an electric axial blower V as described above.
3A and 3B are drawings showing a case where a high-output motor is provided in (a), and FIG. Note that FIG.
The same components as those shown in FIG. In this figure, by changing the motor mount without changing the casing 1, the output of the motor is changed to increase the static pressure and air volume of the electric axial flow blower.

That is, by removing the motor mount 4 (FIG. 1) detachably provided on the casing 1, and attaching the external motor mount 6 in place of the motor mount 4 (FIG. 1), the same casing 1, That is, the static pressure and air volume of the electric axial flow blower Va are increased by using the casing 1 having the same diameter. Reference numeral 10 denotes a support for the casing 1.

The external motor mount 6 includes a mount mounting plate 6a.
A frame 6b extending from the casing to the casing center axis c;
A bearing 6c provided on the casing central axis c of the frame 6b, and a shaft 6d supported by the bearing 6c
And a pulley 7 provided on the shaft 6d on the side opposite to the impeller;
The motor mounting plate 6f whose distance to the gantry mounting plate 6a can be adjusted by adjusting bolts 6e.

According to the external motor mount 6, the mount mounting plate 6a is mounted on the flange 1b of the casing 1 so that the shaft 6d
Of the motor Ma provided on the motor mounting plate 6f and a pulley 7 provided on the shaft 6d, with a belt 9 applied thereto, and a mounting frame 6a If the distance between the motor and the motor mounting plate 6f is adjusted to the optimum distance by the adjusting bolt 6e, the casing 1
, The high-output motor M can be easily provided.

That is, if only the configuration related to the electric motor Ma is replaced, the speed of the impeller 3 is increased by the high-output electric motor Ma without replacing the casing 1, thereby increasing the static pressure and air volume of the electric axial flow blower Va. Can be. In this case, since the electric motor Ma is provided outside the casing 1, sufficient cooling by the external fan can be performed. It should be noted that the impeller 3 can be driven by the electric motor Ma using a gear other than the belt hanging.

The output of the electric motor Ma and the output of the electric motor M described above may be appropriately determined according to the use conditions and the like.

Even if the electric motor case 2 is formed so as to protrude inside the casing 1 as shown in FIGS. 1 and 3 described above, this type of axial flow blower is used in a place where the static pressure is low. It can be operated without reducing the air volume.

[0028]

The invention according to this application is implemented in the form described above, and has the following effects.

If an electric motor base is provided from the outside of the casing in the electric motor case integrally formed with the casing, an electric axial flow blower in which the electric motor is disposed on the central axis of the casing can be easily formed, so that the electric motor can be cooled. And the time and cost required for manufacturing and assembling the axial blower can be reduced.

Further, if a partition wall for preventing the cooling air from flowing from the discharge side to the suction side is provided, the cooling air flowing from the discharge side at the rear of the motor can be prevented from flowing to the suction side. It is possible to obtain a cooling effect.

Furthermore, if the motor mount is detachably provided from the casing, the motor mount can be removed from the casing and the motor can be changed, so that only the output of the motor can be increased using the same casing. With this casing, it is possible to easily increase the static pressure and air volume.

If the flange is formed integrally with the casing, the productivity of the casing can be further increased.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a drawing showing one embodiment of an electric axial flow blower of the invention according to the present application, (a) is a side sectional view, (b) is a front view, and (c) is an AA sectional view. is there.

FIG. 2 is a diagram showing a temperature inside a motor case in the motor-driven axial blower of FIG. 1;

3A and 3B are diagrams showing a state in which a high-output motor is provided in the electric axial flow blower of FIG. 1, wherein FIG. 3A is a side sectional view, and FIG.
It is B sectional drawing.

FIG. 4 is a half sectional view showing a conventional axial blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 1a ... Flange 2 ... Motor case 2a ... Opening 3 ... Impeller 4 ... Motor mount 5 ... Partition wall 6 ... External motor mount 7 ... Pulley 8 ... Belt 9 ... Pulley i ... Suction side o ... Discharge side w ... Cooling Wind c: Casing central axis M, Ma: Electric motor Mc: External fan V, Va: Electric axial flow blower

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F04D 29/58 F04D 29/52 F04D 29/64 F04D 19/00 F04D 25/08 F04D 25/16 F04D 29 / 32

Claims (4)

(57) [Claims] 1. An electric axial flow blower having an electric motor for driving an impeller on a central axis of a cylindrical casing, wherein the electric motor can be disposed on the central axis of the casing from outside the casing. An electric axial flow blower characterized in that an electric motor case opened outward from a center portion is integrally formed as described above, and an electric motor base on which a motor is disposed on a central axis of a casing in the electric motor case is provided. 2. The electric axial flow blower according to claim 1, wherein a partition wall for preventing cooling air from flowing from the discharge side to the suction side is provided on the motor mount. 3. The electric axial flow blower according to claim 1, wherein the electric motor base is detachably provided from the casing. 4. The electric axial flow blower according to claim 1, wherein flanges are integrally formed at both ends of the casing.