SU1002029A1 - Laboratory centrifugal machine rotor - Google Patents

Description

The invention relates to centrifugal devices for performing physical or chemical processes, in particular rotors with freely suspended centrifuge cups housed in mandrels supplied with the rotor. The invention can be used in biology, biochemistry, biophysics, physiology, micro, biology, medicine, colloid and physical chemistry, geology, soil science and other branches of science and production associated with precise separation of fractions by size and density in various dispersion media. .

Known centrifugal rotor with freely suspended glasses in special mandrels tl, C2.

The closest known to the invention is a rotor of a laboratory centrifuge, including a housing mounted on an electric motor shaft with supports for cup mandrels 2.

The known rotors perform a passive role during centrifugation, i.e. they hold special mandrels with glasses, in which in a horizontal position under the action of centrifugal force, separation occurs

fractions depending on their size and density in various dispersion media. One part of the dispersed phase remains in suspension, and the other settles as a precipitate. When you turn off the centrifuge mandrel with glasses long before the rotor stops moving to a vertical position (non-working). Rotation of the rotor

10 with the vertical position of the glasses leads to the formation in the last rotation of the dispersion medium when the rotor is completely stopped, resulting in a part of the sediment cone-shaped

15. The form rises to a peak to the very top of the dispersion medium. Thus, a partial mixing of the dispersed phases occurs again, introducing an error in the work and reducing the quality of the preparations obtained.

The aim of the invention is to improve the quality of separation by eliminating the mixing of the phases after their separation.

25

The goal is achieved by the fact that the rotor of the laboratory centrifuge, including a housing mounted on the motor shaft with supports for the cup mandrels, is provided with a placed

Claims (2)

30 in the housing by a gear system serving to ensure rotation of the cups in the direction opposite to the direction of rotation of the rotor at the moment of its stopping, while the pinion gears of the system interact with the rack and pinion mechanism attached to the flange of the motor housing and are connected to the mandrels by means of fingers and . Fig. 1 shows a rotor of a laboratory centrifuge, top view (a thin line shows a gear system); in fig. 2 - A-A in FIG. 1. The rotor includes case 1, passive supports 2 of centrifugal cups and their active supports 3. In the case there is a gear system, containing gears 4, transmitting the movement of the mandrels, gears 5, receiving rotational movement from the conical distribution gears 6 driven gears 7 , the driving tester 8 with bearings 9 and the intermediate gears 10. The driving gear 8 of the system interacts with the rack and pinion mechanism, made in the form of a ring 11 mounted on the flange 12 of the motor housing, and are connected to the mandrels by means of ohm rods 13 and fingers 14. The rotor is mounted on shaft 15 of the motor rotor 16. The rotor operates as follows: As soon as the rotor starts to rotate, the driving gears 8, by moving the camping ring with a rack gear 11 begins to rotate the entire system. The glasses in the mandrels rotate to the side. opposite to the direction of rotation of the rotor. When the centrifugal force increases, the glasses with mandrels move to a horizontal position, with the drive gear of each mandrel (not shown) coming out of the engagement with gear 4, while the mandrel moves the pin 14, which by means of the pull 13 moves the drive gear 8, removing it from engagement with the ring. 11 The mechanism is disconnected; the rotor holds special mandrels with centrifuge cups in which the dispersed phase is separated by size and density. When the rotor stops, the mandrel with a glass smoothly moves to a vertical position, the leading gear wheel of the mandrel engages with gear 4, at which time the mandrel moves the finger 14 to the center of the centrifuge, through the cable 13 enters the driving gear 8 into engagement with the ring 11. The mechanism is transferred to working position. Centrifugal cups received rotation in the mandrels, thus excluding the possibility of displacing medium movement relative to the cups and mixing the dispersed phases separated during centrifugation. Claims A laboratory centrifuge rotor comprising a housing mounted on an electric motor shaft with supports for cup holders, characterized in that, in order to improve the quality of separation by eliminating phase mixing after their separation, it is provided with a gear system arranged in the housing for ensuring rotation of the glasses in the direction opposite to the direction of rotation of the rotor at the time of its stopping, while the drive gears of the system interact with the rack and pinion mechanism mounted on the housing flange engine, and associated with the mandrels by means of rods and fingers. Sources of information taken into account in the examination 1. German patent 2637900, cl. B 04 B 5/04, 1978. 2.Sokolov V.I. Modern industrial centrifuges. M., Mechanical Engineering, 1967, p. 174 (prototype).