JPS6341076Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to vibration control in unbalanced operation of a centrifugal separator.

In a centrifugal separator, a sample to be separated is set in a rotor and separated by high speed rotation. In this case, if the sample to be separated is not set in the rotor in a well-balanced manner symmetrical to the rotational axis, the rotor will swing around, and when the rotor swings, the drive motor that rotates the rotor will swing around, resulting in stable rotation. I can't.

Operation with large vibrations is not only extremely dangerous, but also makes it impossible to separate the sample with high precision.

In order to rotate the rotor stably, it is best to have a structure that prevents one part of the rotating shaft system from wobbling as much as possible. That is, in the case of the structure of this centrifuge, it is important to provide vibration isolation at the lower end of the motor, that is, at the position furthest from the rotor.

Conventionally, the lower end of the motor is not supported elastically, so when the rotor vibrates, the lower end of the motor swings around significantly. Therefore, when a large unbalanced operation occurs, the entire rotating system swings out and stable rotation cannot be obtained, and the rotor collides with the rotor chamber, sometimes resulting in damage to the rotating shaft.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to improve the unbalanced operation performance of this type of centrifugal separator, thereby simplifying the operation and enabling safe operation. The present invention will be explained below with reference to examples.

The motor 1 is elastically supported vertically by a cabinet 5 by an anti-vibration spring 2. When the rotor 3 becomes unbalanced, the rotor 3 swings around. As a result, the lower part of the motor 1 swings around a lot. When the unbalance of the rotor 3 increases, the lower end of the motor 3 also swings significantly and rotates unstablely. However, the lower end of the motor 3 is provided with a radial damper 4 that elastically supports it from the outer circumferential direction. The damper 4 is held in a cabinet 5, and when the whirling amplitude of the motor 1 is small, the amount of deflection with respect to the load is large and the elastic supporting force is small, and when the whirling amplitude is large, such as when passing a critical speed, the amount of deflection with respect to the load is small. The cross-sectional area of the outer diameter side is larger than that of the inner diameter side so that the elastic supporting force becomes larger as the elastic support force becomes smaller. FIG. 2 shows a characteristic curve of the damper 4, with the load W plotted on the horizontal axis and the deflection amount δ plotted on the vertical axis.

According to the present invention, the lower end of the motor is elastically supported by a radial damper, which reduces the amount of deflection with respect to the load rapidly when the swinging load of the motor exceeds a predetermined value. Since the lower part of the motor does not swing around even when the motor is turned on, vibration control is possible and stable rotation can be obtained from low speeds to high speeds. Therefore, centrifugation can be performed even if the sample to be separated has a rough balance.
Furthermore, even if there is a large imbalance in the rotor, the entire drive system does not undergo large vibrations, so the rotor does not come into contact with the rotor chamber or abnormal stress is generated in the rotor shaft.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the centrifugal separator of the present invention. FIG. 2 is a characteristic curve diagram of the radial damper according to the present invention. 1 is a motor, 2 is an anti-vibration spring, 3 is a rotor, 4 is a radial damper, and 5 is a cabinet.

Claims (1)

[Scope of utility model registration request] In a centrifugal separator in which a motor that drives a rotor is elastically supported vertically in a cabinet, the lower outer periphery of the motor is elastically supported by a radial damper, and the radial damper is used to prevent the whirling load of the motor applied thereto exceeding a predetermined value. A centrifugal separator characterized by being configured such that the amount of deflection against load after that is rapidly reduced.