JPH0565720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a swirl blower particularly suitable for obtaining high wind pressure.

[Background of the invention]

As shown in FIG. 1, a conventional vortex blower is comprised of a motor section a and a blower section b. That is, the motor part a has a rotating shaft d attached to the motor casing c.
is inserted, and the impeller e of the blower section b is fixed to one end of the rotating shaft d, and the cooling fan f for cooling the electric motor section a is fixed to the other end. On the other hand, in the blower section b, a blower casing i is formed by a return plate g and a cover h formed on the outer periphery thereof, and an impeller e fixed to the rotating shaft d is built inside the blower casing i. The circulation plate g also serves as a part of the motor casing c, and its central portion is supported at one end of the rotating shaft d via a bearing j.

Then, when the rotation axis d of the electric motor section is driven,
As the impeller e rotates, outside air is sucked into the blower casing i from the suction port of the sound absorber k, and the sucked air is accelerated and pressurized, so that it is delivered to the sound absorber k with a desired wind pressure. It is designed to be discharged from the discharge port.

By the way, in the conventional vortex blower shown above, heat is generated in the blower casing i due to air friction loss, so both sides of the bearing mounting part formed on the return plate g are opened to dissipate the heat inside the blower casing. Ventilation is provided to prevent the bearing j from being affected by heat.

However, when trying to increase the wind pressure to improve performance, the temperature inside the blower casing i becomes particularly significant, and as a result, the lubricant (grease) in the bearing j deteriorates due to the influence of heat, causing the bearing j to burn out. This may not only cause sticking, but may also have a thermal effect on the inside of the motor casing a. Therefore, there is a drawback that it cannot cope with higher wind pressure.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention aims to provide a vortex blower that can prevent the electric motor section and bearings from being adversely affected by heat, and that can cope with higher pressures.

[Summary of the invention]

The present invention relates to a motor casing having a side plate formed with a bearing holding part at one end, the motor casing inserted through the motor casing, one end supported by the bearing holding part of the side plate via a bearing, and the other end being supported by the bearing holding part of the side plate through a bearing. A blower casing having a rotating shaft to which a cooling fan is fixed, a blower casing having an impeller fixed to one end of the rotating shaft, and an intermediate frame interposed between the blower casing and the motor casing and having ventilation holes on the circumferential side. The extension pipe extends from the bearing holding portion of the side plate to the blower casing, has an internal space with an appropriate gap from the rotating shaft, and connects the inside of the blower casing and the bearing. It is characterized by having ventilation holes formed on the circumferential side of the
This makes it possible to achieve the above object by suppressing the rise in temperature within the blower casing.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the vortex blower according to the present invention, the blower casing does not constitute a part of the motor casing as in the conventional case, and the blower casing and the motor casing are each constructed separately. That is, this vortex blower consists of a motor section A and a blower section B, and includes a motor casing 1 and a rotating shaft 2.
and a blower casing 3.

Specifically, the motor casing 1
consists of a cylindrical body with a stator installed inside, and a side plate 11 is formed at one end of the cylindrical body. A bearing holding portion 12 is formed in the center of the side plate 11, and one end of the rotating shaft 2 is supported by the holding portion 12 via a bearing 4. The rotating shaft 2 has a rotor and is inserted through the motor casing 1. One end of the rotating shaft 2 is supported by the holding part 12 via a bearing 4, and the other end has a rotor for cooling the motor. A cooling fan 5 is fixed.

The blower casing 3 is formed by a return plate 31 through which one end of the rotating shaft 2 is inserted, and a cover 32 attached to the outer periphery of the return plate 31, and a cover 32 fixed to one end of the rotating shaft 2 inside. A built-in impeller 33 is built in. Also, the blower casing 3
A sound absorber 6 having an intake port and an exhaust port is attached to the lower part of the reflux plate 31 .

When the impeller 33 is rotated by the drive of the rotating shaft 2, air is sucked into the blower casing 3 from the intake port of the sound absorber 6, and the air is circulated between the reflux plate 31 and the impeller 33. However, by being accelerated and pressurized, it is discharged from the exhaust port at a desired wind pressure. At this time, since the electric motor generates heat, the motor section A can be cooled by blowing air onto the electric motor section A by rotating the cooling fan 5.

Thus, an intermediate frame 7 is interposed between the motor casing 1 and the blower casing 3. The intermediate frame 7 has a cylindrical shape, and one end thereof is attached to the outer peripheral edge of one end of the motor casing 1.
and the other end is the return flow plate 31 of the blower casing 3
are attached to the outer periphery of each. A ventilation hole 71 is formed in the circumferential side of the intermediate frame 7. The ventilation holes 71 pass through the circumferential side of the intermediate frame 7, for example, along the axial direction, and are formed in plural along the circumferential direction.

Further, an extension pipe 13 is formed in the bearing holding portion 12 of the side plate 11 so as to extend up to the blower casing 3. The extension tube 13 is connected to the bearing holding section 12.
is formed at the end facing the reflux plate 31 so as to extend to the rotating shaft insertion part 31a of the reflux plate 31, and communicates with the rotating shaft 2 with an appropriate gap and the inside of the bearing 4 and the blower casing 3. has been done. Further, a ventilation hole 14 is bored in the peripheral side of the extension part 13, and the inside and outside of the extension tube 13 are communicated through the ventilation hole 14. The ventilation hole 14 is formed perpendicular to the axial direction of the extension tube 13.

When the vortex blower is driven, the heat generated in the blower casing 3 is released to the outside through the ventilation hole 14 of the extension pipe 13 and the ventilation hole 71 of the intermediate frame 7, and the cooling air for the electric motor is passed through the ventilation hole 14 of the extension pipe 13 and the ventilation hole 71 of the intermediate frame 7. The inside of the blower casing 3 can be cooled by being sucked into the extension pipe 13 through the ventilation hole 14.

Since the vortex blower according to the present invention has the above-described configuration, its operation will be described separately for use for discharge and intake. That is, when the vortex blower is used for discharge, the pressure inside the blower casing 1 becomes positive, so the heat generated inside the blower casing 1 leaks into the extension pipe 13 as shown by the arrow in FIG. It enters the intermediate frame 7 through the ventilation hole 14 of the extension tube 13 and escapes to the outside through the ventilation hole 71 of the intermediate frame 7. Therefore,
Since the heat inside the blower casing 1 can be released to the outside, it is possible to suppress the temperature inside the blower casing from increasing. As a result, not only the bearing 4 is not adversely affected by heat, but also the motor section A is not adversely affected by the blower section B. Moreover, since cooling air for the electric motor is taken in inside the intermediate frame 7, the extension pipe 13 can be cooled, and therefore the bearing 4 can be cooled well.

In addition, when a vortex blower is used for intake, the inside of the blower casing 1 becomes negative pressure.
As shown by the arrow shown in the figure, the cooling air for the electric motor sucked into the intermediate frame 7 passes through the extension pipe 13 from the ventilation hole 14 of the extension pipe 13 to the blower casing 1.
sucked inside. Therefore, since the cooling air is sucked into the blower casing 1, an increase in the temperature inside the blower casing 1 can be reliably suppressed. As a result, the bearing 4 is cooled, so that the bearing 4 and the motor section A are not adversely affected.

〔Effect of the invention〕

As described above, according to the present invention, the temperature inside the blower casing is suppressed from increasing during operation, and the structure is configured so that there is no thermal effect on the electric motor section and bearings. There are effects that can be addressed.

[Brief explanation of drawings]

Fig. 1 is a cutaway sectional view showing an example of the configuration of a conventional vortex blower, Figs. 2 and 3 show an embodiment of the vortex blower according to the present invention, and Fig. 2 shows a state in which it is used for discharge. FIG. 3 is a cross-sectional view for explaining the operation, showing a state in which it is used for intake. 1... Motor casing, 11... Side plate, 12
... Bearing holding part, 13 ... Extension pipe, 14 ... Extension pipe ventilation hole, 2 ... Rotating shaft, 3 ... Blower casing, 4 ... Bearing, 5 ... Cooling fan, 7 ...
Intermediate frame, 71...Intermediate frame ventilation hole.

Claims (1)

[Claims] 1. A motor casing having a side plate formed with a bearing holding part, and a rotating motor through which the motor casing is inserted, one end of which is supported via the bearing on the bearing holding part of the side plate, and one end of which protrudes outward. a shaft; an impeller fixed to the one end of the rotating shaft;
A blower casing that covers the impeller, and an intermediate frame that is interposed between the blower casing and the motor casing and has a ventilation hole in the peripheral side, wherein the bearing holding portion of the side plate and the blower A vortex flow characterized by forming an extension pipe that has an appropriate gap between the rotating shaft and the casing and connecting the inside of the blower casing and the bearing, and a ventilation hole formed on the circumferential side of the extension pipe. Blower.