US873528A - Vapor-pump. - Google Patents

Description

PATENTED DEC. 10, 1907.

3 SHEETS-SHEET 1.

Y H. A. FLEUSS. VAPOR PUMP.

a v F APPLICATION FILED SEPT. 15, 1905.

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No. 873,528. PATBNTED DEG. 10,-1907. H. A. FLEUSS.

VAPOR PUMP.

APPLICATION FILED SEPT.15, 1905.

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VAPOR PUMR. APPLICATION PILEDfiEPT. 15, 1905.

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UNITED sTATEs PATENT oEEIoE.

HENRY ALBERT FLEUSS, OF READING, ENGLAND, ASSIGNOR To PULSOMETER ENGINEERING COMPANY, LIM TED, or READING, ENGLAND.-

VAPOR-PUMP.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed $eptember 15, 1905 Serial No. 278.668.

steam engines and more especially with condensers used in conjunction with turbines.

In surface condensers used with steam engines it is now common to draw off the condensed water by one pump, and to use a secondpump for drawing oii air, and it may be more or ess uncondensed steam from the condenser. The vacuum obtainable by pumps hitherto used for this purpose is however not as complete as it is capable of being made.

According to my invention I employ for the drawing off of air and more or less steam from the condenser, a, pump kept heated suflicientlyto avoid steam condensing within it, and delivering the air and steam to a second or subsidiary condenser from which all water resulting from condensation of steam is drawn ed by a second pump maintained in as cool a state as practicable.

The pump for drawing off air and steam from the first condenser and delivering them to the second,-I form as in my well known vacuum pumps with the delivery valve at' the top of a vertical cylinder and with this valve and the reciprocating piston kept always covered with oil, some of the oil above the piston being compelled to pass the de livery valve at the end of each upstroke, and a corresponding quantity of oil being al lowed fto flow backon to the piston during the first portion of the down stroke, by reason of a projection on the piston holding the delivery valve open at this time. To avoid condensation of steam in such a pump, I

' form the end cover of the cylinder (in which is formed the seating for the delivery valve) hollow, and maintain it in a heated state by passin exhaustor other steam through it.

The oi above the delivery valve is thereby kept heated, and the oil above the piston is also heated by its being brought into contact with the heated cylinder end at the com- 55 pletion of each upstroke. Theoil is in this Water remaining within the pump. In this way pumps similar to my well known vacu- .way kept sufiiciently heated to prevent any .um pumps are rendered capable of pumping steam or steam laden air just as efliciently as they could before be used for pumping dry air, and as is well known these pumps are capable of producing extremely high vacuum.

The outlet from the delivery chamber which is above the cylinder I couple by a delivery pipe with a second condenser, it

may be with the upper end of a vertical coil cooled externally. Upon the above mentioned delivery pipe, I provide a relief-valve to allow of free discharge of air when starting. The lower end of the coil, or the outlet from this second condenser, I lead to the suction inlet of a second but unheated pump, in fact the water and air delivered to this pump should be as cold as practicable.

Figure 1 is a vertical section and Fig. 2 a horizontal section on the line a b Fig. 1 of a pump for pumping steam or vapor constructed as above described. Fig. 3 shows an elevation and Fig. 4 a plan of a pair of pumps of this kind drawing steam and air from a steam engine condenser and deliver ing them to a second condenser from which condensed water and air is drawn 0H by a second pump which may be of ordinary construction.

, In Figs. 3 and 4 a a are two pumps each formed in the manner above described to be capable of pumping steam or rarefied aqueous vapor. b is t e lower part of an ordinary surface condenser and l) 1) parts of some of its lower tubes. 0 is a pipe taking air steam or rarefied vapor from the lower part of the condenser to the suction inlet of the two pumps and c a pipe by which water resulting from condensation is drawn off by a pump in the ordinary way. d are delivery pipes by which the vapor is conveyed from the pumps to the upper end of a vertical coil e cooled externally by water admitted continuously to the lower part of the tank f and allowed to flow away from itat the top. Relief valves are provided at g g on the delivery pipes 01 to allow of free discharge of air when starting. it is a pipe leading from the lower end of the coil to a small tank'i and from thence to the suction inlet of a pump k which may be of any suitable construction. The piston rods of the pumps a and it have fixed to them cross-heads a, 76', connected by rods, a, 762, to a pair of beams, y, which are connected by the rod, y, to a crank on the shaft, 3

The construction of the pumps a will be understood from Figs. 1 and 2. In these figures Z is the pump barrel, m the piston or bucket, m a projection on it, and m a valve in it. n is the delivery valve in the pump barrel cover a. 0 is a chamber above this cover opening at the top into an enlarged chamber 1) from which there is a discharge outlet at 1). The piston rod works through a stuffing box in the center of the delivery valve n a coiled spring a; surrounding the piston rod between this stuffing box and an abutment above it which may he a second stufiing box keeps the packing tight and presses the delivery valve downwards on to its seat. A third stu'fling box u kept covered with oil is also used at the top to prevent leakage of air downwards into the chamber 0.

Steam or vapor is drawn into the pump through the suction inlet 1 and chamber 8.

The delivery valve and the piston or bucket are as shown kept covered with oil. The pump barrel cover is as shown formed with a hollow annular chamber t and is kept heated by steam admitted to this chamber through a pipe 15. t is an outlet by which steam and condensed water can pass away from the annular chamber.

When the piston is at the bottom of its stroke as shown in Fig. 1 it is below the openings s which connect the chamber 8 with the pump barrel and the pump barrel fills freely with steam or vapor or air. When the piston rises and approaches the upper part of its stroke the vapor becomes compressed and would condense if it were not kept heated by the oil on the top of the piston. At the top of the stroke the compressed vapor and some of the oil above the piston are discharged through the delivery valve a into the chamber 0. At the commencement of the down stroke this valve is for a short time kept open by the projection m on the piston to allow oil to flow back from the chamber to the barrel Z and as the oil in this chamber rests on the cover of the annular steam chamber if this oil is kept always in a heated state so that, no condensation of vapor takes place. In place of the oil in the chamber 0 being kept heated by steam supplied to an annular chamber surrounding the seat of the delivery valve it might be kept heated in other ways, I however prefer to heat in the way above described.

Pumps constructed in the above manner with the oil kept heated. so that no condensation of vapor can take place within the pump are applicable for pumping ordinary undried air or condensible vapors of all kinds for producing a vacuum in the chamher from which the vapors are drawn as for example from evaporating and drying chambers.

What I claim is 1. The combination of a pump having its delivery valve and piston covered. with liquid and means for heating said liquid above the delivery valve.

2. The combination of a pump having its delivery valve covered with liquid, a chamber surrounding the delivery valve, having its upper surface formed of thin metal and forming part of the bottom of the oil containing chamber above the delivery valve and means for passing steam through the chamber to heat said. liquid and thus prevent the condensation of vapor while passing through the pump.

HENRY ALBERT FLEUSS.

Witnesses:

H. D. JAMESON," F. L. RAND.

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