Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1983-07-22
1984-12-25
Gluck, Richard E.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
417344, 417346, F04B 910, F04B 1502
Patent
active
044900961
DESCRIPTION:
BRIEF SUMMARY
This invention relates to pump systems, and is particularly concerned with pump systems which are appropriate for propelling wet mixes and slurrys along a pipe, or even for the pumping of water. For example, the pump system of the present invention may be used for propelling a wet mix of concrete, or for the transportation of solids such as coal, limestone and the like which can be made into a slurry. The pump system of the present invention may also be used to pump "mud", the so-called mixture used in the drilling of wells, bored foundations, etc. The pump system can also be used as a pressure intensifier, for example for forcing a grout into rock or other porous material. The pump system of the present invention can also be used in conjunction with machines which produce continuous plastics extrusions, the pump system being used to force granular plastics material into the machine. The pump of the present invention can be adapted for use at very high pressures.
The pump system of the present invention is based upon a system which comprises at least two cylinders, in each of which a pump piston (or in the limit case the free end of a piston rod) is reciprocated by hydraulic or other power, with valve arrangements being provided so that, as each pump piston is moved backwards, i.e. is retracted, it draws the liquid, slurry, mix or the like into its associated cylinder from a suitable source, and as each pump piston moves forward it forces the liquid, slurry, mix or the like out of the cylinder and along a delivery pipe or the equivalent.
A disadvantage of known pump systems of this general type is that the rate of delivery of the material fluctuates, in that as one pump piston ends its forward movement the column of mix in the delivery pipe tends to come to a halt, and then, as the next pump piston commences a forward movement, it has to accelerate the whole column of mix in the delivery pipe. This leads to undesirable mechanical stresses in the system and to a waste of power, due primarily to the fact that the column of mix has to be accelerated twice in every pumping cycle.
British patent specification GB No. 1581640 describes a pumping system in which there are two cylinders each divided into two chambers by an interior wall. A piston rod extends through each wall and carries a piston at each end. The annular chamber in one cylinder between the dividing wall and one of the pistons is hydraulically connected to the corresponding annular chamber in the other cylinder between its dividing wall and the corresponding piston. A small pump feeds the connecting line and this line is equipped with a relief valve. The interconnection and the small pump effect a return movement of the pistons, whereby the return stroke of each piston is completed more rapidly than the forward stroke, and the forward stroke of each piston begins before the other piston completes its forward stroke.
However, this known system is not able to overcome the problem of preventing fluctuations in the output of material delivered. In this known system there would be sudden increases in pressure in the connecting line at certain times in the pump cycle, and this would cause pressure and flow variations in the output of the pumped material.
It is an object of the present invention to provide an improved pump system which reduces such fluctuations to a minimum and which is thus substantially free from mechanical and hydraulic shock. This is achieved by ensuring not only that the column of material in the delivery pipe does not stop between every single pump piston stroke, but also that there is an appropriate transfer of power from one piston to the other to result in a smooth, non-fluctuating output.
It is a further object of the invention to provide the pump system with a control circuit which senses given instants in the pumping cycle and responds thereto to cause a balanced output to be maintained.
Because the energy required to accelerate the material in the delivery pipe may be a relatively large part of the input power, this means that
REFERENCES:
patent: 3481622 (1976-09-01), Hall et al.
patent: 3847511 (1974-11-01), Cole
Gluck Richard E.
Hands-England Drilling Limited
LandOfFree
Pump system for liquid/solid materials with balanced output does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pump system for liquid/solid materials with balanced output, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pump system for liquid/solid materials with balanced output will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1150574