JPH04229098A - Centrifugal decounter - Google Patents

Abstract

PURPOSE: To regenerate the deceleration energy of a motor used as a break and send it out as a current to the other motor during operation of the device, and keep the motion speed of a driven element constant. CONSTITUTION: A centrifugal decanter in which the two motors 1 and 6 of a ball 5 and a screw 8 are coupled with each other by frequency converters 9 and 10, and the DC circuits of these frequency converters are connected with each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal decanter with an energy recovery function. The centrifugal decanter is equipped with a conveying screw. The conveying screw is accommodated in a ball having the same axis as the screw, in particular in an internal cylindrical/conical ball. The ball is rotationally driven by the first electric motor at a speed different from the speed of the screw, which is rotationally driven by the second electric motor and the reduction unit.

0002

[Prior Art and Problems to be Solved by the Invention] U.S. Pat.
A type of device that sends the signal back to the motor is disclosed. However, the speed of the ball cannot be changed. Changing the speed differential between the ball and the conveying screw requires disassembling the device and replacing the drive gear. In short, it is important to be able to adjust the speed of the ball to control the finish of the product being processed and to vary the differential speed to control the water content of the solid extract.

The centrifugal decanter of the present invention with first and second frequency converters overcomes these drawbacks. A. of the first and second frequency converters. C. The circuit outputs are electrically connected to the first and second motors, respectively. D of two converters. C. The positive terminals of the circuits are electrically connected to each other, and the negative terminals of these converters are also electrically connected to each other.

[0004] Frequency converter D. C. By connecting the circuit, it is possible to recover the energy of the second motor when it is acting as a brake and send this energy to the first motor. Moreover, A. which can be controlled individually using a control unit. C. The installed circuit allows the speed to be adjusted to a constant level even while the device is in operation.

Preferably, a diode is installed between the second frequency converter and the first frequency converter, and a D.C. C. It prevents current from flowing and allows current to flow only in the opposite direction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram of a centrifugal decanter according to the present invention.

The centrifugal decanter is equipped with a first motor 1 that rotates a first shaft 3 using a drive belt. The first shaft 3 rotates the outer rim of the reduction unit 4 and also rotates the cylindrical/conical ball 5.

[0008] The second motor 6 moves the second shaft 7 to the first
This second shaft 7 drives the screw 8 inside the cylindrical/conical ball 5 through the reduction unit 4 at a rotation speed faster than the rotation speed of the ball 5. A of the first frequency converter 9
．． C. The output end of the circuit 9a is electrically connected to the first motor 1. A. of the second frequency converter 10. C.
The output of the circuit 10a is electrically connected to the second electric motor 6. Two frequency converters 9, 10 D.
C. The positive and negative terminals of circuits 9c and 10c are each connected to each other, and D. C. In order to allow current to flow from frequency converter 10 to frequency converter 9, but not in the opposite direction, a diode 11 is installed between the two positive terminals.

The frequency of the current flowing through the circuits 9a, 10a is determined by the control unit 15, via voltage dividers 13, 14, respectively.
12 to maintain a constant speed during operation of the device.

During operation, the braking energy recovered by the frequency converter 10 is sent to the motor 1 via the frequency converter 9, rather than being wasted using resistors or the like.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a centrifugal decanter according to the present invention.

[Explanation of symbols]

1 First motor 2 Drive belt 3 First shaft 4 Reduction unit 5 Cylindrical/conical ball 6 Second motor 7 Second shaft 8 Screw 9 First frequency converter 10 Second frequency converter

Claims (2)

[Claims] 1. A centrifugal decanter comprising: a ball rotatably driven by a first electric motor; and a ball housed within the ball and rotatably driven by a second electric motor and a speed reduction unit at a speed different from the speed of the ball. a screw, first and second frequency converters each having an output end of an alternating current circuit, a positive terminal of a direct current circuit and a negative terminal of a direct current circuit; the output end of the alternating current circuit of the first frequency converter is electrically connected to the first motor, and the output end of the alternating current circuit of the second frequency converter is electrically connected to the second motor. A centrifugal decanter that is connected to the DC circuit, with the positive terminals of both DC circuits electrically connected to each other, and the negative terminals of both DC circuits electrically connected to each other. 2. The decanter according to claim 1, further comprising a diode installed between the second frequency converter and the first frequency converter, so that a direct current is transmitted from the first frequency converter to the second frequency converter. A decanter designed to prevent current from flowing.