JPS60190699A - Volute fan - Google Patents

Abstract

PURPOSE:To prevent the temperature rise in the casing of a volute fan by providing an intermediate frame having a vent between the fan casing and the motor casing while providing an extending tube having a vent at the bearing holding section. CONSTITUTION:A bearing holding section 12 is provided on the sideboard 11 of motor casing 1 while the air fed from a cooling fan 5 will pass through the vent 14 of an extended tube 13 and a vent 71 of an intermediate frame 7 to leave the heat in the casing thus to cool the interior of the fan casing. Consequently, the temperature rise in the fan casing upon driving can be suppressed to cause no thermal influence.

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]

The conventional vortex blower has a 5K motor section a as shown in Figure 1.
It consists of a blower section and a blower section. That is, in the motor part a, a rotating shaft d is inserted through the motor casing C, and an impeller e of the blower part is fixed to one end of the rotating shaft d.
A cooling fan f for cooling the motor part a is fixed to the other end.

On the other hand, in the blower section, a blower casing 1 is formed by a return plate g and a cover h formed on its outer periphery, and an impeller e fixed to the rotating shaft d is provided inside the blower casing 1.
is built-in. 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.

When the rotating shaft d of the electric motor section is driven, the impeller e
As the external air rotates, external air is sucked into the blower casing 1 from the suction port of the sound absorber, and the sucked air is accelerated and pressurized, and is discharged from the discharge port of the sound absorber with a desired wind pressure. It has become so.

By the way, in the conventional vortex blower shown above, heat is generated in the blower casing 1 due to air friction loss. , thereby preventing any thermal effects on the bearing j.

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 provides a motor casing having a side plate formed with a bearing holding part at one end, the motor casing being inserted through the motor casing, one end being supported by the bearing holding part of the side plate via a trap bearing, and the other end being supported by the bearing holding part of the side plate through a trap bearing. A rotating shaft with a fixed cooling fan,
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 a ventilation hole in a peripheral side thereof, and holding the side plate for a bearing. The part extends to the blower casing, and the inside has an appropriate gap with the rotating shaft, and an extension pipe is formed that connects the inside of the blower casing and the bearing, and a pore is formed on the circumferential side of the extension pipe. This feature 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 instead the blower casing and the motor casing are formed on each side. That is, this vortex blower has a motor section A
and a blower section B, including a motor casing 1, a rotating shaft 2, and a blower casing 3.

Specifically, the motor casing 1 is made of a cylindrical body in which a stator is installed, 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 the bearing 4? One end of the rotary shaft 2 is supported through it. 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 of a return plate 31 through which one end of the rotating shaft 2 is inserted, and a cover 62 attached to the outer periphery of the return plate 31, and the rotating shaft 2 is inserted inside the cover 62.
An impeller 53 fixed to one end is built-in. Further, a sound absorber 6 having an intake port and an exhaust port is attached to the lower part of the blower casing 6, that is, the lower part of the reflux plate 31.

When the impeller 55 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 transferred to the reflux plate 31 and the impeller 63.
The gas is accelerated and pressurized while flowing back through the air, and is discharged from the exhaust port at a desired air pressure. At that time, the electric motor generates heat, so the cooling fan 5 rotates to remove air from the electric motor part A.
By spraying on the air, it is possible to cool down the machine section A.

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 circumferential edge of one end of the motor casing 1, and the other end is attached to the outer circumferential edge of the return flow plate 31 of the blower casing 3.

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 and extends to the blower casing 3. The extension tube 15 is formed at the end of the bearing holding part 12 facing the return flow plate 61 so as to extend to the return flow plate 510 rotation shaft insertion part 31a, and has an appropriate gap with the rotation shaft 2 and is connected to the rotation shaft 2 and the rotation shaft. The inside of the blower casing 3 is connected. Further, a ventilation hole 14 is bored in the peripheral side of the extension portion 130, 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, heat generated within the blower casing 3 escapes to the outside through the ventilation holes 14 of the extension tube 13 and the ventilation holes 71 of the intermediate frame 70, and the cooling air for the motor is passed through the ventilation holes 71 and the ventilation holes 71. Extension tube 16 via pore 14
The inside of the blower casing 6 can be cooled by being sucked into the blower casing 6.

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. Vent hole 1 of extension pipe 13
4 into the intermediate frame 7, and escapes to the outside through the ventilation hole 71 of the intermediate frame 7. Therefore, the heat inside the blower casing 1 can be released to the outside.
It is possible to suppress the temperature rise inside the blower casing. 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 feeding machine section B. Moreover, intermediate frame 7
Since cooling air for the electric motor is introduced inside the extension pipe 13, the extension pipe 13 can be cooled, and therefore the bearing 4 can be cooled well.

Furthermore, when the vortex blower is used for air intake, the inside of the blower casing 1 becomes negative pressure, so the cooling air for the electric motor sucked into the intermediate frame 7 flows through the extension pipe 130 as shown by the arrow in FIG. The air is sucked into the blower casing 1 from the ventilation holes 14, -' through the extension pipe 13. 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 rising during operation, and the structure is configured so that there is no thermal effect on the electric motor section and bearings, so that higher pressure can be achieved. There are effects that can be addressed.

[Brief explanation of drawings]

Fig. 1 shows a broken cross-sectional view of 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... Electric 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 lI21 $2 figure

Claims (1)

[Claims] a motor casing having a side plate with a bearing holding part formed thereon; and a rotating shaft through which the mirror-shaped motor casing is inserted, one end of which is supported by the bearing holding part of the side plate via a trap bearing, and one end of which protrudes outward. an impeller fixed to the one end of the rotating shaft; a blower casing that covers the impeller; and an intermediate frame interposed between the core blower casing and the motor casing and having a ventilation hole on the peripheral side. An extension pipe is formed between the bearing holding part of the side plate and the blower casing with an appropriate gap from the rotating shaft, and connects the inside of the blower casing and the bearing. A vortex blower characterized by having ventilation holes formed on the circumferential side.