Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1997-11-14
1999-06-22
Verdier, Christopher
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 551, F04D 500
Patent
active
059136570
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to improvements in and to pumps and, particularly, to side channel pumps characterized by increased efficiency and reduced noise generation. Accordingly, the general objects of the present invention are to provide novel and improved apparatus of such character.
In a conventional prior art side channel pump, an impeller with vanes arranged in a star-shaped manner and with open vane interspaces is closely surrounded by a housing. The housing forms axially, next to the impeller, a side channel which is open towards the impeller and in which the medium to be pumped is conveyed by an exchange of pulses with the impeller. German Patent 739,353 shows a prior art side channel pump design which has gained acceptance for single-stage pumps. In this prior pump both the supply and discharge of the medium take place the same side of the impeller. The supply and discharge spaces are consequently concentrated on one part of the pump. In the known pumps of this type, the side channel is also arranged on that side of the impeller on which the medium is supplied and discharged. This arrangement makes it simpler to guide the medium being pumped, because the inflow and outflow ports are connected directly to the side channel.
In other pump types, in which the supply and discharge of the medium take place on different sides of the impeller, and particularly in the case of multi-stage pumps, the medium being pumped has to flow from the supply side through the impeller to the discharge side (Pohlenz: Pumpen fur Flussigkeiten und Gase, Berlin 1975, page 336, 337).
There has been a long standing desire in the art to improve the efficiency and suction capacity of side channel pumps while simultaneously reducing the noise generated during the operation of such pumps
SUMMARY OF THE INVENTION
The present invention overcomes the above briefly-discussed and other deficiencies and disadvantages of the prior art by providing a novel and improved side channel pump wherein, on each impeller stage, the side channel is arranged on the opposite side of the impeller with respect to the supply and discharge ports. In a pump in accordance with the invention, the outflow end of the side channel is connected to the pump discharge port by means of a channel which extends radially to the outside of the impeller.
A pump in accordance with the present invention has a somewhat more complicated construction when compared to the prior art due to the fact that the side channel is not arranged on the medium supply and discharge side of the impeller. Nevertheless, cavitation in the liquid inflow region has been found to be reduced. This effect is unexpected. In previously proposed side channel pumps, unlike the pump of the present invention, a buffer cross-section of the side channel is provided between the medium inflow port and the impeller to minimize cavitation whereas, in accordance with the present invention, the medium coming from the medium inflow port strikes the impeller directly.
The discharge structure of a side channel pump in accordance with the invention is also novel and contrary to conventional practice. As is known from multi-stage pumps, there is per se no problem in guiding the medium being pressurized through the impeller from the side channel to the outflow port. It would therefore have been obvious to guide the medium from the side channel through the impeller to the outflow port. A requisite characteristic of side channel pumps is that they require a comparatively small amount of space and material, this characteristic being achievable because the housing closely surrounds the impeller on the circumference and its diameter is therefore restricted essentially to approximately the impeller diameter. The rerouting channel of a side channel pump in accordance with the invention is located radially outwardly with respect to the circumference of the impeller and this entails an enlargement of the pump housing. However, this departure from conventional de
REFERENCES:
patent: 3558236 (1971-01-01), Bylsma
patent: 4508492 (1985-04-01), Kusakawa et al.
patent: 5011369 (1991-04-01), Mine et al.
European Patent Office, Patent Abstracts of Japan, vol: 13, No: 455; Publication No. JP1177492, Jul. 1989; Patent No. A 1177492, Jul. 1989.
European Patent Office, Patent Abstracts of Japan, vol: 13, No: 405; Publication No. JP1147196, Jun. 1989; Patent No. A 1147196; Jun. 1989.
European Patent Office; Patent Abstracts of Japan; vol. 13, No: 405; Publicatino No. JP1147195, Jun. 1989; Patent No. A 1147195, Jun. 1989.
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