Dual disc pump

Details Dual disc pump Dual disc pump

2000-06-12

2001-11-13

Thorpe, Timothy S. (Department: 3746)

Pumps

Expansible chamber type

Mechanically actuated distributor

C417S539000

Reexamination Certificate

active

06315532

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dual disc pump.
2. Description of the Prior Art
Double disc pumps comprise a housing having a pumping chamber therein, an inlet and an outlet to the pumping chamber, first and second seats formed in said pumping chamber at spaced locations, a suction pumping disc reciprocable into and out of engagement with said first seat, a pressure pumping disc reciprocable into and out of engagement with said second seat and means to reciprocate said pumping disc out of phase with one another.
In traditional double disc pumps the pump is essentially glandless and gives indefinite dry running ability, combined with good self-priming and solids handling. These pumps are ideal for medium flow sludge transfer duties and are widely used on unmanned primary sewerage treatment works. A double disc pump eliminates the need for shaft sealing and valve problems inherent in other types of pumps. In addition to sludge transfer, these pumps can handle liquids, slurries, large suspended solids, thixotropic media and liquid/gas mixtures.
While such double disc pumps have proved to be generally satisfactory there is room for improvement.
SUMMARY OF THE INVENTION
According to the present invention, the suction disc is phased to lag by more than 180° behind the pressure disc.
The applicants have found that, as compared with conventional pumps in which the suction disc is phased to lag by exactly 180° behind the pressure disc, certain advantages arise.
Firstly, there can be a very marked reduction in the noise of the pump.
Secondly, there can be a worthwhile improvement in the efficiency of the pump, producing a higher flow rate. This combination of improvements is highly surprising and is contrary to normal pump technology experience.
In a preferred construction according to the invention the suction disc is phased to lag by between 190° and 225°, and preferably by between 205° and 215° behind the pressure disc.
In particular if the latter parameters are chosen, experiments have shown that, in one particular construction, the noise level of the pump, operating perfectly normally, can be reduced from about 85 dBA and the flow rate can be increased from about 45 m
3
/hr to about 48 m
3
/hr.


REFERENCES:
patent: 4473339 (1984-09-01), Hughes
patent: 5529466 (1996-06-01), Tackett
patent: 5733105 (1998-03-01), Beckett et al.
patent: 5993174 (1999-11-01), Konishi
patent: 6200111 (2001-03-01), Foss
patent: 539247 (1941-09-01), None
patent: 1399742 (1975-07-01), None
patent: 2013287 (1979-08-01), None

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