Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1984-01-12
1985-12-24
Gluck, Richard E.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417 19, 417 34, F04B 4900
Patent
active
045603227
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a regulator in a motor driven pump for the regulation of the output pressure so as to maintain a predetermined value.
It is a principal object of the present invention to provide a regulator of the kind mentioned above, which automatically and reliably regulates the output pressure according to a previously adjusted value, by way of example in connection with an increase or a reduction respectively of the output flow from the pump, among other things in order to prevent cavitation and to reduce the risk of an interruption of the flow of the liquid in the pump.
It is an additional object of the invention to throttle the liquid supply to the motor of the pump to a minimum automatically, when there is an interruption in the supply.
Regulators of the prior art function either electronically or by means of pistons. Such constructions are complicated and have large dimensions.
The objects of the invention are obtained by means of a regulator according to the present invention, which is subststantially characterized by a main valve arrangement, preferably a double diaphragm, which via a preferably spring biased transmission means of movement is connected with a control mechanism serving the purpose of regulating the capacity of the pump. A chamber, which is defined by or bordering upon said main valve arrangement, is connected with the output pressure from the pump in order to actuate said main valve arrangement, so that the adjustment of the control mechanism of the pump capacity to a desired degree can be made. An increased or reduced, respectively, fluid output from the pump causes a displacement of the main valve arrangement towards the maximum and the minimum position respectively of the same.
The invention is described in the following, reference being made to the accompanying drawings, in which:
FIG. 1 is a partly sectional perspective view of a regulator designed according to the invention,
FIG. 2 shows the regulator in another sectional view,
FIG. 3 is a peerspective view of the regulator,
FIG. 4 is a schematical view showing the regulator in a first position,
FIG. 5 shows the regulator in a second position,
FIG. 6 shows the regulator in a third position, and
FIG. 7 shows an additional embodiment of a regulator.
The regulator is intended to find an application in pumps working with a liquid.
More specifically (FIG. 8) the regulator R of the invention described in greater detail further below is connected to the suction and pressure sides of a pump P via hoses 31 and 30, respectively. Regulator R controls, via a linkage 4 and wire 10, a motor M which in turn drives pump P. Regulator R has a regulator housing, which in the drawings is indicated with the digit 1. It is formed by a number of housing parts 1A, 1B, 1C and 1D respectively, which are coupled together and have a number of recesses which in unassembled condition of the parts 1A-1D are open and located right in front of each other in order to form a number of chambers and spaces, the location and function of which will be explained further on.
The housing 1 has a preferably angular arm 4, which is pivoted on a shaft 5, which is supported by a fastening means 6 on the housing 1. Said arm 4 by the bias of a spring 7 tends with one angular arm portion 4A to be moved in direction towards the housing 1, while at the same time it is abutting against one end 8A of a pistion rod 8, which through an opening 9 protrudes out of the housing 1.
The other angular arm portion 4B of the pivoting arm 4 is connected with the throttle control of the propulsion means of the pump, i.e. the motor, said connection by way of example comprising a wire 10 (see FIGS. 4 to 6) or other similar transmission means. The spring biased piston rod 8 through the opening 9 penetrates into a space 11, which extends through the three housing parts 1B, 1C and 1D, and in the space between the same clamps two diaphragm elements 12A and 12B respectively, which together form a double diaphragm 12. This double diaphragm 12 is by means of the end portion 8B of
REFERENCES:
patent: 2704631 (1955-03-01), Bancel
patent: 2816507 (1957-12-01), LeGore
patent: 2989000 (1961-06-01), Alcaro
patent: 3796515 (1974-03-01), Lindgvist et al.
patent: 4140436 (1979-02-01), Schumacher
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