Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1995-02-21
1998-02-17
Look, Edward K.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
415 562, 137114, 137907, F04B 4906
Patent
active
057185646
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The present invention is generally related to the pumps field and more precisely relates to a centrifugal water pump having the multiple functions of depth suction, self-priming, pressure adjustment, self-priming with pressure adjustment, automatic start up and shut down.
2. Description of the prior art
At the present time there are known both self-priming centrifugal pumps and depth suction centrifugal pumps.
The first type of these pumps comprises an internal by-pass through which a little share of water circulates backwards from the delivery side to the suction side, thus allowing the pump to be always flooded during the elimination of the air present in the suction pipe. When this air is ended the pressure increases causing a ball valve provided in the by-pass to stop such backflow so as to reduce the pressure drops inside the pump. Other types of self-priming pumps are not provided with the ball valve in the by-pass and reduce the pressure drop due to the permanent internal circulation of water by means of a Venturi tube at the delivery side.
The second type of these pumps comprises a minor delivery outlet through which a share of flow is led to an ejector placed at the suction point (i.e. in a deep well) so as to increase the local pressure and allowing the water to be sucked by the pump in spite of the depth.
Concerning the pressure adjustment, the pumps are provided with external circuits comprising either pressure control valves or flow control valves or speed control devices of the engine.
As concerning the start up and shut down of the engine, the pumps can be provided with automatic devices comprising pressure switches connected with the power supply of the engine of the pump and operating in case of overcoming the pressure limits inside the body of the pump.
The above described pumps are able to solve separately the priming, depth suction, pressure adjustment and automatic shut down and start up problems, but at the present time said features and functions have never been combined.
It is an object of the present invention to provide a centrifugal pump having the multiple functions of depth suction, self-priming, internal pressure adjustment and automatic shut down/start up in case of pressure overcoming maximum limits.
SUMMARY OF THE INVENTION
The above objects are reached by the centrifugal pump according to the invention which has a diffuser engaging with a suction body and a delivery body fixed to the upstream and downstream ends of said diffuser respectively and provided with corresponding suction and delivery chambers. The characteristic of the pump is that said diffuser is housed in a water jacket defined by a spacing case fixed between said bodies and communicating with said delivery chamber. The suction body comprises a multifunctional chamber communicating with the jacket and provided with a first and a second auxiliary outlet communicating with the suction chamber and with the external of the pump respectively. There are provided plugging means engaging in said auxiliary outlets and suitable for different pumping functions.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the pump according to the invention will be made clearer with the following description of a non limiting, exemplifying embodiment, with reference to the attached drawings.
In the drawings:
FIG. 1 shows a longitudinal sectional view of a centrifugal pump according to the invention;
FIG. 2 shows a partial sectional view of a self-priming valve of the pump of FIG. 1;
FIG. 3 shows a partial sectional view of a pressure adjustment valve of the pump of FIG. 1;
FIG. 4 shows a partial sectional view of a self-priming -- pressure adjustment valve of the pump of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to FIG. 1 a centrifugal pump has a diffuser 1 engaging with a rotor 25, a suction body 2 and a delivery body 3 fixed to the upstream and downstream ends 1a and 1b of said diffuser 1 respectively. Suction body 2 and delivery body 3
REFERENCES:
patent: 4669495 (1987-06-01), Boyce
Philip A. Schweitzer. Handbook Of Valves. (Industrial Press: New York, 1972, pp. 162-163.
Look Edward K.
Nocchi Pompe S.P.A.
Thai Xuan M.
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