GEA Mechanical Equipment engineering for a better world

Technical Data | Decanters type CD 20, CE 20, CD 30, CE 30, CD 34, CE 34, CB 36, CB 45, CC 45, CA 50, CB 50, CB 63, CA 75

GEA Westfalia Separator 2-Gear Drive

The patented 2-gear drive from GEA

Westfalia Separator permits automatic

torque measurement and differential

speed control. The main motor drives

the bowl via the housing of the primary

gear and simultaneously the housing of

the secondary gear. The speed-controlled

secondary motor drives the input shaft

of the secondary gear.

This drive is recommended if

• the discharged solids from the

decanter are to have the lowest

possible residual moisture

• the decanter is to be run at the

smallest possible differential speeds

with maximum solids discharge

volumes

• the discharged solids are to have

a uniform DS content despite

fluctuating production conditions

• the capacity is to be increased as

compared to decanters with

standard drive

Advantages

• Torque-dependent differential speed

control

• The basic differential speed can be

altered by exchanging the belt pulleys

• Stepless torque load signal

• Reliable overload protection

(electrical, without shear pin); the

machine can be re-started immediately

• Improved efficiency due to internal

feedback

• Available for installation in explosive

surroundings

• Very low space requirement

• Low maintenance requirement and

environmentally friendly

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GEA Mechanical Equipment

GEA Westfalia Separator Group GmbH

Werner-Habig-Straße 1, 59302 Oelde, GermanyPhone: +49 2522 77-0, Fax: +49 2522 77-2089www.gea.com

Technical Data 2-Gear DriveOperating principles and constructional features

Decantertype

Basic differen-tial speed from / to

Differential speed control range approx.

Secondary motor

CD 20.-..-.2 2 – 33 min-1 12 min-1 0.75 kW

CE 20.-..-.2 2 – 33 min-1 12 min-1 0.75 kW

CD 30.-..-.2 1.5 – 40 min-1 9.5 / 13 min-1 2.2 kW

CE 30.-..-.2 1.5 – 40 min-1 9.5 / 13 min-1 2.2 kW

CD 34.-..-.2 1.5 – 40 min-1 9.5 / 13 min-1 2,2 kW

CE 34.-..-.2 1.5 – 40 min-1 9.5 / 13 min-1 2.2 kW

CB 36.-..-.2 2 – 35 min-1 8 min-1 1.5 kW

CB 45.-..-.2 2 – 49 min-1 7.5 / 15 min-1 7.5 / 11 kW

CC 45.-..-.2 2 – 49 min-1 7.5 / 15 min-1 7.5 / 11 kW

CA 501.-..-.2 2 – 49 min-1 7.5 / 15 min-1 7.5 / 11 kW

CB 50.-..-.2 1 – 70 min-1 17 / 25 min-1 7.5 / 15 kW

CB 63.-..-.2 1 – 73 min-1 19 min-1 22 kW

CA 75.-..-.2 1 – 41 min-1 8 min-1 30 kW

Function

Drive for torque-dependent control of the differential speed.

Field of application

Everywhere where a high dewatering level of the solids is

required, e. g. in starch and waste water treatment plants, the

beverage and food industry etc. The basic differential speed is

flexibly adapted to the process.

1 Secondary drive motor

2 Secondary gear

3 Bowl drive

4 Bowl

5 Scroll

6 Separation space

7 Feed

8 Gravity discharge of the

clarified liquid phase

9 Solids discharge

10 Primary gear

11 Primary drive motor

1 2 3 4 5 6

7

891011

Operating principles of the 2-gear drive

The height of the torque between the bowl and the scroll

depends on the nature of the solids, the solids level in the bowl,

the bowl speed and other factors. The power consumption of the

secondary motor depends on the torque between the scroll and

the bowl.

The basic differential speed remains constant as long as the

torque does not exceed the control begin. If the torque exceeds

this value, the controller increases continuously the frequency-

controlled secondary motor speed and hence the differential

speed. The increased differential speed accelerates the convey-

ance of the solids in the bowl.

Reduction in the solids volume results in corresponding reduc-

tion of the torque at the scroll. Consequently, the controller reacts

to the decreasing torque by reducing the speed of the secondary

motor, which results in a drop in the differential speed.

Bowl and scroll drive

As in the case of the gear drive in the standard decanter version,

the bowl (4) is driven by the main motor (11) via V-belts. The pri-

mary gear (10) whose housing is firmly connected to the bowl (4)

and rotates at the same speed drives the scroll (5) via the driven

shaft. The secondary gear (2) is driven by the secondary motor (1).

In addition, the driven shaft of the secondary gear is connected

to the drive shaft of the primary gear on which the housing of

the secondary gear rotates. Due to an internal power feedback to

the bowl drive (3), the housing of the secondary gear (2) is braked.