DE1822891U - EXPLOSION-PROTECTED SPEED-CONTROLLED DRIVE FOR CENTRIFUGES USING A HYDAULIC MOTOR AND CONTROL PUMP. - Google Patents

Description

Explosion-proof, variable-speed drive for centrifuges using a hydraulic motor and control pump. ------------------------------------- In the chemical industry, explosion protection is a crucial factor when driving centrifuges. It is known to use appropriate electric motors, water turbines and similar drives to achieve a completely satisfactory solution to this problem in terms of function.

In the case of centrifuges with bottom discharge, however, this is often difficult tied together. So it is necessary, for example, when driving the centrifuge through Electric motors to arrange them laterally to the free cross-section of the emptying opening to keep it as large as possible. When the drum is emptied after the spin cycle should not be operated by hand, but by a scraper, is beyond the often the usual half speed during filling and full operating speed also provide a further, very low speed for scraping. The electromotive solution for these three speeds is relatively complex and space-consuming.

When driven by water turbines, the purely apparatus-related increases The effort is already considerable. The advantage of this latter drive lies in the Infinitely variable speed control, which can only be done electrically by expensive collector motors could be achieved. The main disadvantage, however, is that it is taken into account the so-called "passage speed". This is the case with water turbines around twice the operating speed. The result is an increase in the drum wall thickness, which can be taken into account in terms of strength due to the possible higher speed must and thus requires a further increase in the price of the unit.

The subject of the invention is the drive of centrifuges by hydraulic motors, which no longer have the above-mentioned defects. This engine comes directly with coupled to the drum shaft. A pump supplies the pressure medium to the motor and drives it at him. By regulating the pump, the motor speed can be continuously adjusted achieved. The starters and others required for the heavy start-up of centrifuges electrical control devices or special circuits are not required. The deceleration of the rotating parts is done by reversing the direction of rotation of the motor.

Further advantages of the hydraulic motor are its low weight, its low overall height, the elimination of any couplings, the enlargement of the free ones Exit surface for the material to be centrifuged in the emptying shafts and the perfect one Explosion protection for this drive. The oil supply, oil return and leakage lines can be laid as far as you want from the motor to the pump, so that the latter can also be used in can be installed in another room.

Furthermore, the advantages of the combination of the hydraulic motor, which is directly connected to the drum shaft, and the control pump for bottom discharge centrifuges can be seen as head drive, dfh. above the centrifuge drum t ---.... use as well as for top-discharge centrifuges, both in vertical and horizontal storage design.

In the same way, this drive can be used on continuous Centrifuges regardless of the type of discharge of the product, horizontally or vertically Construction with head or foot drive.

In the drawings, exemplary embodiments of the invention are to explain but not by way of limitation.

It shows the arrangement of the hydraulic motor and pump Fig. 1) in a vertically mounted centrifuge with bottom drive, Fig. 2) with a vertically mounted centrifuge Centrifuge with top drive, Fig. 3) in a horizontally mounted centrifuge.

A pump (1) supplies the hydraulic motor (2) with a pressure medium via a line (3) and drives the centrifuge drum (5) through the direct coupling of the hydraulic motor (2) and drum shaft (4). Over a Line (6) is the return of the pressure medium tel. - BSB claims. 1.) Explosion-proof drive from horizontal or vertically stored centrifuges with dis-

Claims (4)

continuous or continuous mode of operation regardless of which one Type of discharge of the Product, characterized in that a hydraulic motor (2) Connected directly to the drum shaft (4) and by regulating the hydraulic motor (2) a pump supplying pressure medium (1) a stepless speed change of the centrifuge drum (5) takes place, with the deceleration of the rotating parts by reversing the direction of rotation of the motor he follows. 2.) Explosion-proof drive according to claim 1), characterized in that that with vertically mounted centrifuges for bottom or top emptying of the hydraulic motor (2) is attached above or below the centrifuge drum (5), however in horizontally stored centrifuges either in front of or behind the centrifuge drum. 3.) Explosion-proof drive according to claim 1) and 2), characterized characterized in that in any continuous centrifuge the hydraulic motor with control pump also for stepless control of the discharge element for the dwell time of the product in the centrifuge drum. 4.) Explosion-proof drive according to claim 1) to 3), characterized characterized in that in any continuous centrifuge either the drum speed is continuously variable and the discharge organ speed remains constant or the The drum speed remains constant and the discharge organ speed is continuously variable is or both the drum speed and the discharge organ speed are continuously variable at the same time.