Bumpless pump apparatus adjustable to meet slave system needs
First Claim
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1. An improved pump which comprises:
- first and second positive displacement pumps which have a chamber and a piston means therein, said piston means being connected to a piston rod and extending therefrom and driven by a motive means which reciprocates the piston rod to thereby pump fluid from the cylinder into an outlet line wherein each of said positive displacement pumps includes a valve means to selectively be connected to a downstream system and wherein the downstream system has a specific pressure and one of said pumps has a pump pressure equal to the downstream pressure and the other of said pumps has a pressure below the downstream pressure;
a pressure actuated transducer connected to the respective outlet lines of said pair of positive displacement pumps, said transducer means incorporating means responsive to pressure comparison cross over between the two pressures supplied thereto and further forming an output signal indicative of a pressure comparison cross over wherein the other of said pumps is brought up to a pressure matching the downstream pressure; and
drive means respectively connected to the motive means for the respective pair of pumps, said drive means incorporating means responsive to the output signals supplied thereto to reverse operation of the positive displacement pumps on response to the signal from said pressure responsive switch means, said drive means further incorporating a switch which initiates pumping movement of one of said pumps at a point in the movement of the other of said pumps where the other pump has exhausted a portion of its displacement so that the first of said pumps is reversed and the other continues to pump at the pressure of the downstream system.
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Abstract
Pumping apparatus which incorporates connected piston type positive displacement, slip free pumps is disclosed. They provide pumped outputs at a common displacement rate. They run out of phase to one another so that while one is pumping, the other is able to refill. A three way valve under control of a pressure responsive switch delivers pumped fluid to the down stream outlet when a pressure match is achieved. The apparatus finds application as a constant rate continuous fluid injection pump.
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Citations
12 Claims
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1. An improved pump which comprises:
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first and second positive displacement pumps which have a chamber and a piston means therein, said piston means being connected to a piston rod and extending therefrom and driven by a motive means which reciprocates the piston rod to thereby pump fluid from the cylinder into an outlet line wherein each of said positive displacement pumps includes a valve means to selectively be connected to a downstream system and wherein the downstream system has a specific pressure and one of said pumps has a pump pressure equal to the downstream pressure and the other of said pumps has a pressure below the downstream pressure; a pressure actuated transducer connected to the respective outlet lines of said pair of positive displacement pumps, said transducer means incorporating means responsive to pressure comparison cross over between the two pressures supplied thereto and further forming an output signal indicative of a pressure comparison cross over wherein the other of said pumps is brought up to a pressure matching the downstream pressure; and drive means respectively connected to the motive means for the respective pair of pumps, said drive means incorporating means responsive to the output signals supplied thereto to reverse operation of the positive displacement pumps on response to the signal from said pressure responsive switch means, said drive means further incorporating a switch which initiates pumping movement of one of said pumps at a point in the movement of the other of said pumps where the other pump has exhausted a portion of its displacement so that the first of said pumps is reversed and the other continues to pump at the pressure of the downstream system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification