JPS581499A - Drive apparatus of centrifugal dehydrator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a centrifugal dehydrator, and in particular, in one in which the drive section that provides dehydration rotation for dehydration performance is composed of an axial gap induction motor, when the induction motor is not energized, The braking of the rotor is completely ensured and the rotor is
The gap between the stators is precisely set to a state with good rotational efficiency, and the rotor is also prevented from wobbling.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the housing of the centrifugal dehydrator, 2 is the dehydration tank, 3 is the dehydration capacity rotatably arranged in the dehydration tank 2, 4 is the dehydration shaft, and 6 is the space between the dehydration tank 2 and the dehydration shaft 4. A bellows having elasticity is provided to maintain watertightness, 6 is a sealing member, and 7 is a bearing part.

The model is an axial air gap induction motor, which includes a stator 8, a rotor 9, and a motor shaft 1o. The stator 8 is constructed by integrally molding an iron core 8&, a coil 8b, etc. with a resin material such as non-combustible thermosetting polyester.

The rotor 9 has a rotor core 9eL made of aluminum by diamond-cast molding, shaped into a disc, and its center portion fitted and fixed onto the motor shaft 10. That is, the rotor 9 does not move relative to the motor shaft 10 in either the rotational direction or the axial direction.

11.12 is a bearing provided on the stator 8, and the motor shaft 10
is rotatably supported. 13 is the motor shaft 10 and the dehydration shaft 4
A coupling 14 connecting the two is a suspension that elastically supports the drive section.

Reference numeral 16 denotes a brake lining, which is fixed to the fixed plate 16 so that its sliding surface faces the outer surface of the rotor 9, that is, the upper surface of the rotor 9 in FIG.

A spring 17 biases the rotor 9 away from the stator 8 via the spacer 18 and the bearing 11, and applies an axial force to the rotor so that the upper surface of the rotor 9 comes into contact with the opposing brake lining 16. Give it to 9.

Numeral 19 is a suspension mounting screw that connects the fixing plate 16, stator 8, and suspension 14 to a support 20 for supporting the suspension 14 via a spring washer 21 for adjusting the gap between the rotor 9 and the lining 16. It is fixed with screws.

A support shell is fixed to the bottom of the 22-piece housing 1 with screws 23, and the other end of the suspension 14 is screwed to the annular convex portion 22a at the center thereof.

24 is a dehydration lid that opens and closes the upper opening of the dehydration liquid 3. Then, by opening the dehydration lid 24, a lid switch or a time limit switch (none of which is shown) is opened, and power supply to the induction motor V is stopped.

Next, the bearing 11 will be explained in detail. The bearing 11 has an inner ring 111L, an outer ring 11b, and balls 11c, and the same is true for the bearing 12.

A spring 17 is attached to the upper end surface of the inner ring 111L via a spacer 18.
is located, and this spring 17 urges the rotor 9 upward.

On the other hand, by energizing the induction motor V, a field force that attracts the rotor 9 is generated in the stator 8, and the rotor 9 is pulled downward against the spring 17 by this force.

Due to this tension, the inner ring 11a is out of dimension as shown by 2 in FIG. 2 compared to the outer ring 11b, that is, the inner and outer rings 11a
1b phase T7. (The outer dimension of the gear in the D+#I+ direction is pushed down by a dimension 1. By pushing down by a dimension 2, a gap corresponding to the above dimension is created between the brake lining 16 and the outer surface of the rotor 9.

In the above configuration, when the centrifugal dehydrator is operating, opening the dehydration lid 24 opens the lid switch (not shown) or the time limit switch (not shown) as described above. Then, the energization to the axial gap 14% motor M is turned off. At this time, the rotor 9 moves upward in FIG. 1 along with the shaft 1o in the length direction of the motor shaft 10 due to the force of the spring 170, and the upper surface of the rotor 9 comes into contact with the brake lining 16, causing the rotating dehydrated fluid to 3 is braked and its rotation is stopped.

Conversely, when the axial air gap induction motor M is energized, the rotor core 91L of the rotor 9 is attracted by the field force set by the core 8a of the stator 8, the coil 8b, etc., and at the same time, the rotor core 91L is attracted. 9 is the gap size between the inner and outer rings 111L and 11b of the bearing 11. The rotor 9 moves downward together with the motor shaft 10. As a result, the rotor 9 separates from the brake lining 16 and is released from braking, resulting in a dewatering movement. will be started.

As described above, the rotor 9 moves together with the motor shaft 10, but it goes without saying that the movement of the motor shaft 1o also moves the dehydration shaft 4 and the dehydration liquid 3 connected thereto.

A configuration has already been proposed in which the rotor 9 is slidable in the length direction of the motor shaft 1o and linked in the rotational direction. Therefore, the rotor 9 is likely to run out of its surface, and considerable precision is required to prevent this runout. Further, in order to increase the rotational force of the rotor 9, it is necessary to make the stator 8 as close to each other as possible, but it is difficult to make the stator 8 close to each other because of the risk of surface wobbling as described above.

However, as is clear from the above embodiments, according to the present invention, the rotor is fixed to the motor shaft, and when the axial gap induction motor is energized and de-energized, the rotor engages the gears between the inner and outer rings of the bearing. Since the rotor moves outside the dimensions, the entire range of rotor movement can be reliably controlled, and the rotor can be placed fairly close to the stator without surface runout, increasing its rotational force. Moreover, the braking system can be controlled completely and accurately.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a centrifugal dehydrator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts thereof. 3... Dehydration liquid, M... Axial gap induction motor, □8... Stator, 9... Rotor, 1o... Motor Shaft, 11...Bearing, 111L...Inner ring, 1 l b 9. -2
゜Outer ring, 17... Spring.

Claims (1)

[Claims] The drive unit that rotates the dewatering basket for dewatering is composed of an axial gap induction motor, and the induction motor is comprised of a motor shaft rotatably supported by a stator and a bearing provided on the stator, and a motor shaft fixed to the motor shaft. a rotor, a spring is disposed between the stator and the rotor, and when the induction motor is energized, +if the gear lug dimension in the axial direction of the inner and outer rings of the bearing is A site of a centrifugal dewatering machine characterized in that the rotor is configured so that it approaches the stator side against force, and the outer surface of the rotor separates from a brake lining attached to the stator side.
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