JPH0910631A - Centrifugal separator equipped with vibration absorber having shearing viscous resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve separation efficiency by controlling whirling movement or noise generated by the eccentricity of a driving shaft or the unbalance of a rotary part to a minimum at the time of operating in a centrifugal separator. SOLUTION: A shearing vibration absorber 5A is attached between a motor supporter 1A and a motor flange 2a integrated with a motor 2 and the driving shaft is integrated with a motor shaft 3 to completely eliminate the eccentricity of the driving shaft to the motor shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge equipped with a shear type vibration absorber in order to operate the centrifuge quieter and more efficiently.

[0002]

2. Description of the Related Art A centrifuge is a machine for separating a substance having a high specific gravity and a substance having a low specific gravity by centrifugal force. The conventional machine has a problem in the rotating shaft system, vibration is generated during operation, and the separated substances are mixed again during the separation, resulting in poor efficiency.

In FIG. 3 (1a), a (2) motor is mounted on a motor support, and (3B) a motor shaft is integrated with a (3b) flange joint. (3b) A flange joint has a (3d) pin implanted therein, while (3) a flange joint attached to a drive shaft (3c) has rubber (3a) with a hole into which the pin is inserted. A piece is planted. (3d) is inserted into this rubber piece. (3)
The drive shaft is supported by a (3C) drive shaft support via a (3e) ball bearing.

[0004]

In the centrifuge, vibration due to whirling occurs during rotation due to shaft deflection even if the drive shaft and the motor shaft center coincide with each other. Therefore, the vibration due to whirling is compared. It occurs in the extremely low speed rotation range and occurs during the rising of the rotation and during the falling of the rotation.

In addition to the above, when the rotating rotor or the like has an unbalanced mass, the vibration is further increased.

If an elastic joint or the like is used for connecting the motor shaft and the drive shaft, it is inevitable that the center of the motor shaft and the drive shaft are displaced. Deviation of the center causes a decisive problem in rotating machines.

As a result, the substances which have been separated in the rotor are mixed again, so that the separation efficiency becomes poor.

[0008]

[Means for Solving the Problems] It is necessary to improve the separation efficiency and reduce the noise caused by vibration.

In order to match the centers of the motor shaft and the drive shaft, the motor shaft and the drive shaft are integrated. As a result, the number of parts is reduced and the economic effect is large.

For the purpose of improving the separation efficiency, it is desirable to install a vibration absorber that absorbs vibration when whirling occurs and induces vibration.

[0011]

As described above, since the centers of the motor shaft and the drive shaft are aligned with each other, the motor shaft and the drive shaft are integrated with each other, and a vibration absorber is attached to a moving portion, whereby the separation efficiency and the noise can be improved.

Whirling occurs at a relatively low rotational speed in the process of gradually increasing the rotational speed after the motor is started. Passing this whirling rotation speed, stable rotation is maintained without vibration and noise. At the time of this whirling, vibration can be reduced by installing a vibration absorber to suppress the vibration.

The separation operation ends at a certain rated rotation speed, and the rotation speed gradually decreases when the power supply is closed. Whirling occurs again during the descent, and the separated substances are mixed again by this whirling. This is damped by a vibration absorber to prevent mixing.

[0014]

EXAMPLE In FIG. 1, (1) a motor support attached to a centrifugal separator body (1A) is attached, and
A shear type vibration absorber (4) compression type vibration rubber is attached to A), and (2) motor is supported by this compression type vibration damping rubber via a motor flange (2a).

The vibration absorber used in this apparatus is a vibration absorber utilizing the shearing of a viscous fluid, and the commonly used vibration absorber is a cylindrical vibration absorber, and its vibration absorption force is the speed of an object to be vibration-absorbed. It is proportional to the square. From the viewpoint of kinematics, it is desirable that the velocity is proportional to the first power of the speed of the object. In FIG. 2, when the (6) cylinder and the (5) piston move relative to each other, the viscous fluid interposed in the gap of (6a) is sheared, and the shearing force acts on (6) and (6).
Limit the relative motion of a). The ball joint (5a) is attached to the motor flange of FIG. 1, and the threaded portion (5a) is attached to the piston (5). On the other hand, the (5f) ball joint is attached to the motor support in FIG. 1 (1A). Therefore, when the motor (2) in FIG. 1 rotates and (3) the drive shaft whirling motion starts, the motor support (1A) and the motor (2) perform relative motion. When the drive shaft runs around (3A), the rotor vibrates. When (5a) and (5b) expand and contract, (5) piston and (6) cylinder move relative to each other (6a) (6d) in the gap
The viscous resistance of viscous fluid acts to control the vibration amplitude.

[0016]

Since the present invention is constructed as described above, the following effects can be exhibited.

Since the motor shaft and the drive shaft are integrated, they do not deviate from the center, that is, eccentric, so that the whirling of the drive shaft due to the eccentricity can be prevented. That is, the separation efficiency is improved.

By integrating the motor shaft and the drive shaft into one body, the number of parts is reduced and the economic effect is great.

Noise is also reduced by unifying the motor shaft and the drive shaft.

By using the shear-type vibration absorber, even if whirling occurs due to imbalance of the sample in the rotor, an ideal vibration absorbing effect is exhibited and the separation efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an external assembly view of a centrifuge.

FIG. 2 is a vertical sectional view of a shear type vibration absorber.

FIG. 3 is a vertical sectional view of a conventional centrifuge.

[Explanation of symbols]

1 centrifuge body, 1A motor support, 2 motor, 2a motor flange, 3 drive shaft, 3A rotor, 3B motor shaft,
3C drive shaft support, 3b flange joint, 3c flange joint, 4 anti-vibration rubber, 5A shear type vibration absorber, 5 piston, 5
a ball joint, 5b ball joint, 5c O-ring, 5d bearing, 5e ball bearing, 5f ball bearing, 6 cylinder, 6a clearance, 6b screw lid, 6c seal washer, 6d viscous fluid. (3a) Rubber piece

Claims (1)

[Claims] 1. In FIG. 1, (2) a motor shaft in a motor and (3) a drive shaft are integrated, and (1) a motor support attached to a centrifuge body, and (2a).
A centrifugal separator in which a viscous fluid is interposed in a skimmer (6a) formed by a cylinder and a piston (6) mounted between motor flanges, and a shear-type vibration absorber utilizing the shearing force of this viscous fluid is mounted.