US1517898A - Pump for liquids at high temperatures - Google Patents

Description

Dec. 1924. 1,517,898

. L; s. o. A. FIEDLER PUMP FOR LIQUIDS AT HIGH TEMPERATURES Filed Dec. 14, 1923 Se'bastien 0M0 Alfred Fiedler INVENTOR',

Patented Dec. 2, 1924.

1,5175 FFI,

SEBASTIEN OTTO ALFRED FIEDLEB, OF PARTS, FRANCE, ASSIGNOE TO LAUXILIAIRE DES CHEMINS DE FER ET DE LINDUSTRIE, OF PARIS, FRANCE.

PUMP FOR LIQUIDS AT HIGH TEMPERATURES.

Application filed. December 14, 1923. Serial No. 680,625.

To all whom it may concern:

Be it known that I, Sneasrmn O'r'ro ALFRED FIEDLER, citizen of the French Republic, residing at Paris, in the French Lepublic, have invented new and useful 1mprovements in Pumps for Liquids at High Temperatures, of which the following is a specification.

It is well known that the pumps for liquids at high temperatures and particularly pumps for hot water, operate in a somewhat uncertain manner, since during the suction stroke of the pump a depression is produced above the liquid, which causes the more or less important formation of vapour. This vapour is then evacuated during the discharge stroke, but if there is a sutficient quantity thereof, steam pockets are 1 produced in the pipes, the drawbacks of the same being also well known. The present invention has for its object an improvement in pumps for liquids at high temperatures, and 1s more particularly 111- tended for pumps working in synchronism with another pump used to handle the same liquid but at a lower temperature, this improvement consisting in connecting by piping each chamber of the pump used to handle the liquid athigh temperature respectively with the analogous chamber of the pump used to handle the same liquid at a lower temperature and working in synchronism with the first pump, two valves opening in opposite directions being disposed in each of the two connecting pipes.

This arrangement permits the vapour produced by the suction of the pump handling the high temperature liquid to be condensed in the liquid handled by the pump used for the same liquid but at a lower temperature, and this ensures a regular working of the said pump when it operates with liquids even at very high temperatures.

The appended drawing shows by way of example, diagrammatically and in section, an improved tandem pump according to the invention, one cylinder being represented as operating with a liquid heated very near the boiling point and the other operating with the same liquid but at a much lower temperature, one of the end positions of the two pistons coupled together being shown in full and dotted lines.

In the form of construction shown in the drawing, 1 is the cylinder used to withdraw pression, and this liquid is cold water in the 1 case in which the cylinder 1 operates with hot water. I

Two pistons 3 and 41 reciprocate respec-. tively within the cylinders 1 and 2; the two pistons are connected together by the rod 5 and are actuated at the same time by the rod 6. The cylinder 1 has at 7 and 7 the admission orifices for hot water and at 8 and 8 the discharge orifices for this water. The

cylinder 2 has at 9 and 9 the orifices of admission for cold water and at 10 and 10*- the discharge'orifices.

' The chamber 11 of the cylinder 1 is connected with the analogous chamber 12 of the cylinder 2 my means of the piping 18. In

like manner the analogous chambers 14 and 15 of the two cylinders are connected by means of a second piping 16. Avalve box 17 is mounted on the pipe 13. This box contains two clack valves 18 and 19 which open in contrary directions and bear respectively upon the seats 18 and 19 A valve box 20 similar to the box 17 is disposed in the pipe 16. This box contains the clack valves 21 and 22 which open in contrary directions and bear upon their seats 21 and 22.

The operation of the tandem pump thus constituted is as follows. The pistons. 3 and 4 are supposed to start from their left hand dead centre (position in full lines in the drawing) and move to the right in the direction of the arrow 23. A suction of hot water thus takes place in the chamber 11 of the cylinder 1 through the orifice 7 and a suction of cold water takes place in the chamber 12 of the cylinder 2 through the orifice 9. The chambers 14: and 15 are on the contrary working on the discharge stroke.

By the efi'ect of the depression produced by the suction in the chamber 11, the clack valve 19 will fall by its own weight and will hence leave its seat 19. water will thus produce a certain vaporization, and the tension of the nascent vapour, added to the suction produced in the cham- The suction of hot ber 12, Will lift the valve 18 from its seat 18. The vapour thus produced can there fore pass through the pipe 13 and condense in the cold water which is entering the chamber 12 of the cylinder 2. The chamber 11 will thus become filled only with hot water, all the vapour which would tend to be produced being condensed, as stated, and the depression in the chamber 11 resulting from this condensation will increase the speed of admission of hot water into the said chamber 11, thus ensuring the filling in a complete manner. During this movement of the pistons 2-3 and l in the direction of the arrow 23, the hot water previously a-d.- mitted into the chamber 14 and the cold water admitted into the chamber 15 are discharged respectively through 8 and 10 The pressure prevailing in these chambers Will bring the valves 21 and 22 upon their seats 21 and 22, thus peventing all communication between these chambers.

During the return stroke of the pistons 3 and 1, the valves 21 and 22 will afford passage for the vapour given off during the suction of the hot water into the chamber 14, which vapour will condense in the chamber 15. The valves 18 and 19 will on the contrary be brought upon their seats, thus cutting off all communication between the chambers 11 and 12 which are operating by discharge.

These effects will be produced indefinitely in like manner.

Obviously, various constructional modifications may be brought to the device above described Without departing from the spirit of the invention. One has chiefly consid ered the application to water pumps, but obviously the invention is applicable to pumps used to convey any liquids at high temperatures.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. A pump installation comprising a pump for liquid at a high temperature, a pump for the same liquid at a lower temperature, means for operating said pumps in synehronism and means for connecting the suction chamber of one pump with the suction chamber of the other pump during the suction stroke.

2. A pump installation comprising a pump for liquid at a high ten'iperature, a pump for the same liquid at a lower temperature, means for operating said pumps in synchronism, a pipe connecting the suction chamber of one pump with the suction chamber of the other pump, a valve box on said pipe and two valves in said valve box, both valves being adapted to open in opposite directions during the suction stroke.

3. A pump installation comprising a double acting pump for liquid at a high temperature, a double acting pump for the same liquid at a lower temperature, means for operating said pumps in synchronism, pipes connecting the synchronously working suction chambers of the two pumps and valve boxes respectively provided on said pipes, each valve box embodying two valves adapted to open in opposite directions when the corresponding suction chambers of the pumps are operating on suction stroke.

In testimony whereof I have signed my name to this specification.

SEBASTIEN QTTO ALFRED FIEDLER.

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