DE2411899A1 - Multiple reciprocating-sphere-piston pump - has rotor with axial bores for reciprocating spheres acting as pistons - Google Patents

Abstract

During rotation the spheres travel axially through the bores in the rotor under the action of inclined tracks with semicircular cross-section provided in each of the pump end covers, thus producing a pumping action. The pump is preferably combined with a three phase induction motor in which the motor rotor itself is the pump rotor. The motor may, alternatively, be an external rotor motor or be provided with cylindrical instead of spherical pistons elements. The pump is cooled by air circulated around the pump periphery. The running surfaces can be metallic or a suitable hard plastics.

Description

THREE-PHASE PUMP 1. Description The invention is based on a combination a three-phase squirrel cage motor and a new type of pumping system. Both, both Motor and pump are located in the same housing, and it results the following advantages over conventional systems: a) With this system, Otherwise common drive shaft seals can be dispensed with because the drive takes place by an electromagnetic rotating field that can affect the interior of the pump, without this giving rise to a path to the outside for the pump medium.

b) by means of an extended construction (multi-chamber system) In addition, the usual bearings for certain pumping media can be dispensed with, as the Pump system with its spherical pistons a radial bearing, the rotor and the bearing cover cause an axial bearing.

c) By combining the pump and drive motor in one housing the space required for an equivalent pumping system is in many cases by one considerable factor can be reduced.

d) The new pumping system allows a high pumping capacity to be expected. Various piston shapes can also be used.

1.1 Presentation of the drawings Figure shows a three-phase motor in Section that has been expanded into a two-chamber ball pump system. The special on the stator of this motor is that its winding "i" is embedded in plastic "b" and "h" which prevents the pumping medium from penetrating the winding.

There are two sockets "f" in the rotor or rotor, each with two Balls are guided. These balls serve as a kind of piston through which the bottom and bottom Overpressure spaces are created.

The spaces are created by the fact that during one rotation of the runner insert the balls at different depths into the bearing cover "k", along the line "m", penetration. To the spherical segment-shaped channel in the bearing cover leads from the outside, left and to the right of the point with the lowest penetration depth, a hole. The two holes serve as inflow and outflow for the pump medium.

The balls are also guided by spacer bars "n". To a To obtain a flat surface, are on the circular end faces of the rotor Steel washers "e" attached; the usual aluminum conductors must therefore continue can be implemented inside the rotor.

Figure 2 shows the rotor of a two-chamber pump system. He differentiates differs from a conventional squirrel cage only in that two ball guide bushes?! f? 1 are built in and that its aluminum winding is appropriate to this situation Way takes into account.

The aluminum short-circuit winding is implemented behind the end faces. With "p" the conductor bars are in the axial direction, with "o" the outer ones, below the End faces running, connecting conductors and with "c" denotes the laminated core.

FIG. 9 shows a three-phase motor in section with a 4-chamber pump system. The fact that in this system a total of 8 balls alternately in the bearing cap intervene, the rotor receives its radial bearing. Through the circular steel discs "e" on the end faces of the rotor and by selecting the appropriate materials for the two bearing cover, the rotor is positioned in the axial direction. This system is supposed to make it possible to dispense with conventional bearings.

1.2 Functional description By the effect of the stator rotating field on this starts the runner with a turning movement.

Due to the construction, the balls (Figure 1, g) are forced to follow the lines (Figure 1fm). In the space that is delimited by a spherical segment-shaped channel in the bearing cover and the circular end face of the Rotor, the movement of the ball creates an overpressure in front of it and behind it a negative pressure. This pressure generation characterizes the pumping effect through which the medium is conveyed from the inlet to the outlet opening. They are two identical bearing caps (Figure 1, k) are available, which are installed rotated by 1800 Construction, two pump rooms are realized at the same time.

1.3 Choice of material As a result of the fact that the pump medium enters the engine compartment occurs, particular attention must be paid to the type of medium.

Constructive options that take into account the various circumstances are: a) storage (ball bearings, slide bearings, self-storage through multi-chamber system) b) bearing caps (plastics or various metals) c) balls (plastics or various metals) d) ball guide bushes (plastics or various metals) Due to the relatively large number of combinations of different materials a multitude of possible uses is to be expected.

1.4 Cooling If the motor is not cooled by the pump medium If this is sufficiently guaranteed, a fan can be attached to a bearing cover without losing any of the construction principle of a closed system without seals must be departed. The fan is then stored on the outside of the bearing cover, and it is driven by induction, starting from the interior of the motor.

1.5 Extension of the system 1.5.1 External rotor motor The described Two-chamber and multi-chamber systems can be used just like with conventional three-phase motors the external rotor principle too. With this variant, the Increase the ratio of the outer diameter (FIG. 1, R) to the pump radius (FIG. 1, r); this increases the piston space in relation to the bystem size, which is advantageous can affect the system.

1.5.2 Piston variations The spherical pistons can be equipped with other types of pistons, e.g. flat-bottomed flasks. The spacer bars (Figure 1, n) are through Replaced flat materials that look like a kind of cross shape only with a certain distance from the system center are housed in the runner. The balls are in this system replaced by cylindrical rollers. Such a system can be used for certain applications offer certain advantages.

Claims (1)

2. Claims The following should be protected as patentable: The ball piston pump system, characterized by piston parts that move in the axial direction during one rotation of the rotor are shifted and thereby generate the pumping effect, as in (Figure 1, Figure 3) shown. b) The combination of a three-phase squirrel cage motor and the under "a" mentioned ball pump system, characterized by its arrangement according to (Fig 1 and 3) c) The ball pump system, applied to a three-phase external rotor motor, marked or described under 1.5.1 d) The variation of the pistons - e.g. flat-bottomed pistons -marked or described under 1.5.1