Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Cross flow runner
Patent
1982-09-23
1985-02-19
Yuen, Henry C.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Cross flow runner
415213T, F04D 500
Patent
active
045002533
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a side-channel pump comprising an open impeller and a side-channel formed with a semi-circular side wall and having an inlet and an outlet and a bead projecting substantially axially into the side-channel, which is located between the inlet and the outlet.
Contrary to the centrifugal pump the side-channel pump has a flow rate/pressure characteristic according to which maximum pressure is obtained at zero flow rate. The side-channel pump consumes maximum power at this maximum pressure. E.g. DE-A-15 28 822 discloses a solution of the problem to reduce the pressure at lower flow rates. The side-channel pump shown and described therein is of the type referred to above, and in that case the purpose of the bead is to provide a modified extension of the flow rate/pressure characteristic which for the side-channel pump having no bead normally is a straight line, i.e. the pressure increases linearly at decreasing flow rate. In one embodiment, several individual beads are provided one after the other in the side-channel, which extend substantially in the circumferential direction of the side-channel, and in another embodiment a single bead is provided concentrically with the side-channel. The bead or beads, respectively, are located in the central region of the side-channel only and extend axially over a quite long distance towards the impeller, the bead or beads, respectively, having a height amounting to 1/2 to 3/4 of the depth of the side-channel.
According to DE-B-27 14 459, the purpose of the bead of a side-channel pump of the type referred to is to attenuate effectively the sound arising due to cavity resonance. In that case the bead is located substantially centrally between the inlet and the outlet of the side-channel and, considering the flow loss, the height thereof is limited to a maximum of 25% of the depth of the side-channel.
The purpose of the invention is primarily to provide a side-channel pump of the type referred to above having a bead in the side-channel, which is particularly well suited for use as a suction source e.g. in a vacuum cleaning apparatus. In this application, the side-channel pump often has to operate in the most central region of the flow rate/pressure characteristic, but at some occasions it is necessary to use the maximum subatmospheric pressure. When heavy objects have to be sucked up, this high subatmospheric pressure is needed for transporting the object through the suction conduit to the separator, and at an obstruction, if any, in the suction conduit causing a flow rate of substantially zero, the high subatmospheric pressure is needed in order to make possible that the material forming the obstruction in the suction conduit is sucked away. Thus, there is a need of a side-channel pump which has a high subatmospheric pressure at zero flow rate and at the same time has high pressure values in the most central region of the characteristic. This need shall be satisfied by the invention, and this is achieved by the side-channel pump of the type referred to above. The side-channel pump according to the invention comprises an open impeller; a side-channel formed with a semi-circular side wall and having an inlet and an outlet; and a bead projection substantially axially into the side-channel and located between the inlet and the outlet at an angular distance from the center of the inlet (as seen in the rotational direction of the impeller) of about 1/5 of the arc over which the side-channel extends from the center of the inlet to the center of the outlet, and preferably is located about 90.degree. from the center line between the inlet and the outlet and having a height of about 25% to about 40% of the internal radius of the side-channel.
The invention will be explained in more detail with reference to the accompanying drawings in which
FIG. 1 is a flow rate/pressure chart,
FIG. 2 is a perspective view, partly a cross-sectional view, of an embodiment of the side-channel pump according to the invention,
FIG. 3 is a cross-sectional view of the pump housing tak
REFERENCES:
patent: 2842062 (1958-07-01), Wright
patent: 3973865 (1976-08-01), Mugele
patent: 4204800 (1980-05-01), Bentele et al.
patent: 4376613 (1983-03-01), Schoenwald
Kwon John
Yuen Henry C.
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