Refrigeration – Utilizing solar energy
Patent
1980-12-09
1983-05-17
Wayner, William E.
Refrigeration
Utilizing solar energy
126432, 165 22, 417393, F04B 1700, F24J 302
Patent
active
043834183
DESCRIPTION:
BRIEF SUMMARY
SUMMARY AND OBJECTS OF THE INVENTION
The invention relates to a circulator pump for conveying a liquid and/or gaseous medium in a closed circuit in which a heat exchanger is located to which heat is supplied from outside, e.g. energy from the sun, and which supplies this heat to another heat exchanger by means of the medium to be circulated, the other heat exchanger delivering heat, e.g. for purposes of heating.
It is an object of the invention to construct the drive of the circulator pump in such a manner that no external energy, such as electric current or mechanical drive, is required. Furthermore as large a volume as possible is pumped through the circuit for a small internal consumption.
The solution of the problem resides in providing a circulator pump which is driven by itself by utilization of the temperature drop prevailing between its input and its output and by the expansion pressure resulting therefrom, and is formed by two differential piston pumps which are mechanically connected together and which are alternately loaded by the medium by means of an automatic control device.
Owing to the use of the medium to be circulated as a drive for the circulator pump, independence from external energy is obtained. In combination therewith it is attained by the use of an automatic control device with differential pistons, wherein a minimum of diverted energy is sufficient for the drive, so that a very good degree of efficiency of the installation is still present.
A relatively large step-up ratio of the differential piston can ensure in a simple manner that only a small volume is required for the drive of the pump, in contrast thereto, however, a large volume is pumped through the circuit. In this case a medium is always pumped from a heat store of higher temperature to a heat store for the delivery of the energy to a lower temperature level. The conveyed quantity of liquid is to be relatively large in proportion to the quantity of liquid which is required for the actuation of the differential piston pumps which the circulator pump constitutes.
Furthermore it is essential that the input loaded by the medium of higher temperature, of the differential piston pumps is alternately connected by the automatic control device to the chambers which comprise the larger volume because of the larger piston areas of the differential piston pumps.
Furthermore it is proposed according to the invention to construct such a thermal drive based on a temperature drop, consisting of at least one heat exchanger system which is filled with liquid and/or gaseous media, one prime mover which is driven by these media, and one charging pump which feeds media to the system, by the use of two differential piston pumps which operate in push-pull. The pistons of these differential piston pumps are connected together by a common piston rod. The piston rod carries control ducts which load an auxiliary control slider member. As soon as the differential pistons reach their end positions, the control ducts of the piston rod load the auxiliary control slider member which in turn switches the chambers of the two differential piston pumps to oppositely directed movement.
It is advantageous to construct the invention in such a manner that the heat exchanger system is always connected to the two chambers of the same differential piston pump, the same pressure prevails at the piston from both sides, so that special sealing measures can be omitted. In particular expensive seals which would be subjected to wear may be dispensed with.
A further embodiment of the invention resides in the arrangement of at least one piston on the reciprocatory auxiliary control slider member, the piston operating as a double-acting pump.
Since both systems, that is to say the differential piston pumps and the auxiliary control slider member with its piston, perform a reciprocatory movement, this double-acting pump at the auxiliary control slider member may be utilized for various additional functions, e.g. for preliminarily compressing the medium before it is fed to
REFERENCES:
patent: 2986907 (1961-06-01), Hoop
patent: 4300540 (1981-11-01), Gray
patent: 4304529 (1981-12-01), Gerich
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