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Rotary pump and multiple rotary pump employed thereof

Rotary pump and multiple rotary pump employed thereof description/claims

The present application is based on, and claims priority from, Korean Patent Application Serial Numbers 2004-0114504, 2005-0001006, 2005-0090212, and 2005-0090214.

1. Technical Field

The present invention relates, in general, to rotary pumps which pump fluid using suction force of rotor units that are rotated by drive motors and, more particularly, to a multiple rotary pump in which a drive motor is provided such that an output shaft of the drive motor is placed at an offset position, so that a rotational speed of the pump can be changed to a high or low speed, and in which an eccentric rotary body is moved in a space defined in each rotor unit, thus preventing a cross-plate from being damaged, and which ensures smooth rotation of the rotor units using a bearing means.

2. Description of the Related Art

As well known to those skilled in the art, pumps are machines which move fluid to another place, for example, from a low position to a high position.

However, conventional pumps have many problems. Hereinafter, a representative conventional pump will be explained, and problems experienced with this pump will be described.

FIG. 1 illustrates a rotary pump in which an upper rotor unit 2, which is provided in an upper chamber 1, is coupled to a lower rotor unit 4, which is provided in a lower chamber 3, through a cross-plate 5.

As shown in FIG. 1, in the conventional rotary pump, when the upper rotor unit 2 and the lower rotor unit 4 are placed upright, the distance between the centers of the upper and lower rotor units 2 and 4, which are offset from the chambers, is shortest.

In other words, the distance between the upper rotor unit 2 and the lower rotor unit 4 becomes shortest.

As shown in the second view of FIG. 1, when the upper rotor unit 2 and the lower rotor unit 4 are placed in an oblique direction, the distance between the centers of the upper and lower rotor units 2 and 4, which are offset from the chambers, is longest.

In other words, the distance between the upper rotor unit 2 and the lower rotor unit 4 becomes longest.

For example, as shown in FIG. 1, when the upper rotor unit 2 and the lower rotor unit 4 are placed upright, the distance between the centers of the upper and lower rotor units 2 and 4, which are offset from the chambers, is 6.90 inches (175.2 mm).

At this time, the distance between the upper rotor unit 2 and the lower rotor unit 4 is 2.41 inches (61.2 mm). As shown in FIG. 1, when the upper rotor unit 2 and the lower rotor unit 4 are placed in an oblique direction, the distance between the centers of the upper and lower rotor units 2 and 4, which are offset from the chambers, is 6.98 inches (177.2 mm).

At this time, the distance between the upper rotor unit 2 and the lower rotor unit 4 is 2.49 inches (63.2 mm).

Here, if the cross-plate 5, which couples the upper rotor unit 2 to the lower rotor unit 4, is a rigid body, the structure and operation of the rotary pump shown in FIG. 1 cannot be realized. In other words, the length of the cross-plate 5 must be varied depending on the positions of the rotor units 2 and 4.

To solve the above-mentioned problem, a rotary pump was proposed in Korean Patent Application No. 1994-010299, entitled “double cylindrical pump.”As shown in FIG. 2, this pump is constructed such that a cross-plate 3 is inserted into a sliding slot 2 formed in a circumferential outer surface of a first sliding body 1 (hereinafter, referred to as an upper rotor unit), and the cross-plate 3 is removably coupled to the upper rotor unit 1 and is integrally coupled to a second sliding body 4 (hereinafter, referred to as a lower rotor unit).

Thus, when the upper rotor unit 1 and the lower rotor unit 4 are placed in an oblique direction, the cross-plate 3 slides in the sliding slot 2 of the upper rotor unit 1, so that the distance between the upper rotor unit 1 and the lower rotor unit 4 can be varied. However, in this pump, in which the distance between the upper and lower rotor units 1 and 4 is varied by the cross-plate 3 moving in the sliding slot 2 of the upper rotor unit 1, because the cross-plate 3 slides in the sliding slot 2 while the upper and lower rotor units 1 and 4 are rotating, there is a likelihood of the cross-plate 3 being undesirably removed from the upper rotor unit 1. Furthermore, in the case that this pump structure is applied to a multiple rotary pump, because rotational force (torque) is applied to the upper rotor unit 1 prior to sliding movement of the cross-plate 3 in the sliding slot 2, torsional stress is applied to offset shafts which rotate the upper rotor unit 1.

Of course, this phenomenon may cause breakage of the offset shafts, the rotor units 1 and 4 or the cross-plate 3.

To solve this problem, a method in which eccentric gears are used to constantly maintain the distance between upper and lower rotor units has been used. However, in the case that this method is applied to a multiple rotary pump, the offset shafts rotate the upper rotor unit in a clockwise direction and rotate the lower rotor unit in a counterclockwise direction using the eccentric gears, thus generating torsional stress. As such, the eccentric gears can be used in a rotary pump having a single structure, but, in the case that the eccentric gears are used in a multiple rotary pump, because the orientations of the rotor units coupled to the shafts are different, an acceleration section is varied by the eccentricity. Thus, the possibility of breakage of the rotor units is increased.

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a multiple rotary pump which pumps fluid using suction force of rotor units rotated by a drive motor, and in which the drive motor is provided such that an output shaft of the drive motor is placed at an offset position, so that a rotational speed of the pump can be changed to high or low speed, and in which an eccentric rotary body is moved in a space defined in each rotor unit, thus preventing a cross-plate from being damaged, and which ensures smooth rotation of the rotor units using a bearing means.

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• Utility Patent

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