JPH06218338A - Fan for aspirator - Google Patents

Abstract

PURPOSE: To reduce the manufacture- and assembly costs of a fan for suction devices and simultaneously to increase the safety to insulation defects. CONSTITUTION: A fan casing 10 is integrally composed of electrically insulative plastic and itself forms an insulating shell 11. The insulating shell tightly separates a motor chamber 1 from the inside chamber 4 of the suction device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction device fan, in which a fan motor supported in a fan casing is electrically insulated and is dust-tight and water-tight to the suction device inner chamber. Related to the ones arranged in.

[0002]

2. Description of the Related Art In a suction device in which wet dust or even water is sucked, it is important to arrange the motor chamber in a dust-tight and water-tight manner and electrically insulated from the inner chamber of the suction device.

For this purpose, plastic casing shells have been used in addition to metal fan casings in the past, so that dust and water cannot enter the motor chamber from the suction device inner chamber, and the motor chamber cannot be placed above it. The casing shell itself closely follows the suction device casing so as to be insulated against the surroundings.

This construction has the disadvantage that the additional casing shell increases the manufacturing costs, and the electrical insulation required due to the fan casing being made of metal is external and especially in the suction device. Care must be taken to ensure that the room is guaranteed in each case.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to enable a fan for a suction device of the type described above to be manufactured and assembled at a reduced cost and at the same time be more safe against insulation defects.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the means of the present invention is such that the fan casing is integrally made of electrically insulative plastic, and the insulating shell itself is formed. That is, the insulating shell closely separates the motor chamber from the suction device inner chamber.

[0007]

The means of the present invention obviates the need to attach an additional plastic shell to the fan casing, which reduces manufacturing costs and because the fan casing is made of plastic, insulation defects are more reliable. It can be avoided.

Advantageously, the fan casing is provided with a bearing for the fan drive shaft, which bearing is provided with a sealing element for sealing against dust and water.

The stator casing of the fan motor uses screw bolts, and the screw bolts have a head capable of being fixed in the fan casing in an assembled state and a screw portion at the other end on the fan motor side. It is advantageous to be fixed to. Therefore, for assembly, the screw bolt is inserted with the head into the casing. The hole in the casing for receiving the screw bolt is configured in the casing rib so that the screw bolt is located in the motor chamber. The screw bolt is also electrically insulated by being inserted in the plastic fan casing in the manner described above.

In an advantageous configuration, the fan casing is constructed substantially concentrically to the axis of the fan drive shaft,
In addition, a peripheral seal member is additionally provided to seal the motor chamber to the suction device inner chamber and the suction device inner chamber to the surrounding space.

Therefore, the fan casing integrally made of plastic forms a central shell which separates and seals the suction device inner chamber from the motor chamber, and additionally the motor chamber with the above mentioned peripheral sealing member. Seal against the surroundings.

In the preferred cylindrical construction, the sealing element is preferably provided in the form of a sealing ring.

[0013]

The drawing shows a cross-sectional view of a fan for a suction device. A fan motor 9 for driving a fan ventilator 7 is arranged in the motor chamber 1, of which a stator pack 5, a fan drive shaft 8 and a motor fan blade 6 are shown. The stator pack 5 is fixed to the fan casing 10 using screw bolts 12. For this purpose, the screw bolts 12 are inserted laterally from the inside into the casing 10 during assembly and are screwed together using nuts with corresponding threads. The original fan ventilator 7 is located in the suction device inner chamber 4, which is arranged directly and concentrically on the motor shaft 8. The motor shaft 8 is in the upper part of the bearing 2 and in the lower part of the fan casing 10 the bearing 3
Is supported by. The bearing 3 has a seal member,
The seal member bearings the suction device inner chamber 4 or the motor chamber 1
Against dust and watertight.

The fan casing 10 is completely closed to the motor chamber 1 except for the penetration for the fan drive shaft 8 of the motor. The fan casing 10 has a continuous shell-shaped rim or an insulating shell 11 that is concentrically formed with the axis of the fan drive shaft 8 in the peripheral part, and the rim has a motor chamber 1 and a suction device inner chamber. Work to seal from 4. For that purpose, sealing members 15 and 16 are provided so that both the motor chamber 1 and the suction device inner chamber 4 are sealed from the surroundings.

Therefore, according to the present invention, the fan motor 9
The screw bolts 12 and the motor fan blades 6 are arranged in a dense and electrically insulated manner with respect to the suction device inner chamber 4 by means of a fan casing 10 which is embodied as a closed plastic shell.

[Brief description of drawings]

1 is a cross-sectional view of a fan for a suction device according to the present invention.

[Explanation of symbols]

1 motor room, 2, 3 bearings, 4 suction device inner room,
5 Stator pack, 6 Motor fan blades, 7
Fan ventilator, 8 Fan drive device, 9
Fan motor, 10 fan casing, 11
Edge, 12 screw bolt, 13 head, 14 screw part, 15 and 16 sealing member

Claims (5)

[Claims] 1. A fan for a suction device, wherein a fan motor (9) supported in a fan casing (10) is electrically insulated, and dust to the suction device inner chamber (4). In the tightly and watertightly arranged type, the fan casing (10) is integrally made of electrically insulative plastic, and the insulating shell (1
1), wherein the insulating shell closely separates the motor chamber (1) from the suction device inner chamber (4). 2. The fan casing (10, 11) comprises a bearing (3) for the fan drive shaft (8), which bearing (3) comprises a sealing member for sealing against dust and water. The fan according to claim 1, which is provided. 3. The stator pack (5) of the fan motor (9) is fixed to the fan casing (10, 11) by means of screw bolts (12), the screw bolts being assembled in the fan casing (10, 11). 3. The fan according to claim 1, further comprising a head portion (13) fixed in the inside of the bracket) and a screw portion (14) at an end portion on the side of the other fan motor (9). 4. The fan according to claim 1, wherein the fan casing (10, 11) is concentric with the axis of the fan drive shaft, and additionally the motor chamber ( 1) A fan provided with a peripheral sealing member for sealing the suction device inner chamber (4) with respect to a surrounding space. 5. A fan according to claim 4, wherein the additional peripheral sealing element is configured in the form of at least one sealing ring.