Delivery unit

Abstract

Delivery units are already known which have a drive rotor and an output rotor driven by the drive rotor, which are supported in a housing, interact in a meshing manner through a spur toothing in each case and draw fluid through at least one inlet and push said fluid out through an outlet, wherein the inlet and the outlet are separated from each other by two separating webs. In order to control the flow rate through the delivery unit, a rotational speed control, a bypass control, or, for gases, a suction throttling, for example, can be carried out. A rotational speed control is energy efficient, but very expensive, because an electric motor must be used, the rotational speed of which can be controlled. In the bypass control, the fluid is delivered from the outlet through a bypass back to the inlet, which however is energetically unfavorable and connected to hydraulic losses. The delivery unit according to the invention is improved in such a way that on the inlet side the flow rate can be controlled very easily and with few hydraulic losses and on the outlet side the inner compression can be adjusted in the event of delivery of gases. According to the invention, at least one of the separating webs (9,10) has at least one control opening (12), the opening cross-section of which can be controlled with a control slide (13).

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a delivery unit. A delivery unit is known already from DE 10 2004 026 048 A1 comprising a drive rotor and an output rotor driven by the drive rotor which are mounted in a housing, interact in a meshing manner via a respective spur toothing and draw fluid through at least one inlet and push said fluid out through an outlet, wherein the inlet and the outlet are separated from each other by two separating webs. In order to control the flow rate through the delivery unit, a rotational speed control, a bypass control or, for gases, a suction throttling can, for example, be carried out. A rotational speed control is energy-efficient but very expensive as an electric motor must be used, the rotational speed of which can be controlled. In the case of bypass control, the fluid is delivered from the outlet via a bypass back to the inlet, which however is unfavorable in energy terms and is associated with hydraulic losses.SUMMARY OF THE...

AI Technical Summary

Benefits of technology

[0002]In contrast, the delivery unit according to the invention has the advantage that on the inlet side the flow rate can be controlled very easily and with few hydraulic losses and on the outlet side the inner compression can be controlled in the event of the delivery of gases, by virtue of the fact that at least one of the separating webs has at least one control opening, the opening cross section of which can be controlled by a control slide. The design according to the invention, in contrast to the prior art, requires less space for the volume flow control, is more cost-effective and is more energy-efficient.

[0005]According to a second embodiment, at least one control opening connected to the outlet side is arranged in a region of the first separating web which lies behind the first transition point in the direction of rotation, as in this way the inner sealing of the delivery unit can be controlled.

Problems solved by technology

A rotational speed control is energy-efficient but very expensive as an electric motor must be used, the rotational speed of which can be controlled.

In the case of bypass control, the fluid is delivered from the outlet via a bypass back to the inlet, which however is unfavorable in energy terms and is associated with hydraulic losses.

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