US1701239A - Pump and like device for controlling the rate of delivery of fluids - Google Patents

Description

Feb. 5, 1929. 1,701,239 E. LUNGE PUMP AND LIKE DEVICE FOR CONTROLLING THE RATE OF DELIVERY OF FLUIDS Filed Nov. 13, 1 925 2 Sheets-Sheet 1 1;; p 16 15 y' 1 1,; 11011 6 I v F Feb. 5, 1929., 1,701,239

. E. LUNGE PUMP AND LIKE DEVICE FOR CONTROLLING THE RATE OF DELIVERY OF FLUIDS Filed Nov. l3 l9 ZSheetS-Sheet 2 54 54 F49 .5 'l 50 6;] i f 53' M Li 2 9 E.

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I lky. 7. 59 52 INVZN T0 7 ywwQwa M Patented Feb. 5, 1929. UNITED, STATES PATENT OFFICE.

ERNEST LUNGE, OF LONDON, ENGLAND, ASSIGNOR TO COURTAULDS LIIIITED, OF

LONDON, ENGLAND, A DRITISH COMPANY. I

PUMP AND LIKE DEVICE FOR CONTROLLING THE RATE OF DELIVERY OF FLUIDS.

Application filed November 13, 1925, Serial No. 68,875, and in Great Britain November 20, 1924.

This invention is for improvements in or in that the liquid flows through all the pump relating to pumps and like devices for conchambers in series towards the outlet. trolling the rate of delivery of fluids, and The invention also comprises various spemore specifically relates to a particular type cific constructions such as are illustrated in of the apparatus for obtaining a continuous the accompanying drawings, and the novel 60 and uniform delivery of liquids at constant features of these constructions will be hereinvelocity, as described in patent application after pointed out.

No. 68,874 filed November 13 1925. Accord- In these drawingsing to that specification, the apparatus com- Figure 1 is a sectional elevation of a simprises the combination with two cyclically- 'plified or diagrammatic construction in 65 actuated pumps whereof each has a deliveryaccordance with this invention; stroke, which includes a period of delivery Figures 2 and 3 are corresponding plan at the desired uniform rate, towards an outviews showing the parts in different posilet common to both of them, and whereof the tions;

said uniform delivery periods successively Figure 4 is an elevation of one practical 70 overlap one another, of a chamber which is embodiment of this invention;

expanded at such arate as to accommodate Figure 5 is a sectional plan of Figure 4; within the apparatus during the overlapping F igure 6 is an elevation of a modified conperiods and without altering the fluid presstruction;

sure in the apparatus, all the flow towards the igure 7 is a plan of the same; and 75 outlet that is in excess of the desired amount. Figure 8 is an end View looking from the The apparatus described in the said -specileft of Figure 6. fication is characterized in that the excess Like reference characters indicate like flow of the liquid which is being delivered parts throughout the drawings.

towards the outlet is diverted from its path Referring first to Figure 1, the pump com- 80 of flow, and accommodated inaspecial champrises a cylinder 10 provided with an inber, whereby the excess is temporarily sublet-opening 11 at one end for connection to a tracted from the total flow. supply-pipe, and from the other open end a The present invention comprises apparatus hollow piston-member 12 extends into the for the same purpose but which is so concylinder. This piston-member is provided 85 structed that the liquid which is being delivwith a valve 13 which can be opened to permit ered towards the outlet is received and stored communication through the member 12, or in the accommodating chamber whilst conclosed to shut 6 such communication. The tinuing its passage towards the outlet. The piston-member 12 enters an intermediate cylapparatus may, according to another feature ind-er 14 and is provided with means for reon of this invention, comprise two reciprocating ciprocating it through a stroke whereof the delivery-pumps, and a chamber bounded by limits are indicated in Figures 2 and 3 in a the pistons of the two said pumps, which cycle of movement as hereinafterdescribed. chamber receives and stores the excess flow. In the other end of the cylinder 14 there is 40 According to a further feature of the nvenmounted a similar piston-member 15 which tion the appara Which mpr s W has a similar valve 16, and the other end of ciprocating pumps and an intermediate this piston-member 15 enters a cylinder 17 chamber as abov t f h. is characterized which is provided with an outlet or deliveryin that the three pump-chambers are arranged port 18.

45 in series with one another, and all the liquid The cycle of movement of the piston-memflows through all the chambers towards the h 12 f th ition shown in Figures 1 outlet. and 2 consist-s of a delivery-stroke towards This intermediate or accommodating chamthe left which includes a brief period of acbc may e te d a reciprocating pu p, celeration, a long period at a uniform veloc- 59 since its action is similar thereto, as herein ity, and a brief period of slowing and stoplater described; using this terminology, the ping. This stroke is followed by a more invention. comprises three reciprocating rapid return-stroke towards the right which pumps operated in unison in the cycle deis accomplished at any convenient rate. scribed in the specification of concurrent pat The cycle of movement of the piston-menicnt application aforesaid, but characterized ber 15 is exactly similar to that of the pistonmember 12, but it is displaced in phase therefrom, so that its period of movement at a uniform rate overlaps at both ends the similar period of movement of the piston-member 12. That is to say, for each of the pistonmembers, the slowing-down of the deliverystroke towards the left, the comparatively rapid return-stroke towards the right, and the acceleration up to the desired uniform delivery-rate towards the left all takes place within the period of uniform movement of the other piston.

The operation of this pump will now be described, and it will be assumed that the whole of the interior of the cylinders and pistons from the inlet 11 to the outlet 18 are filled with liquid. The piston-member 12 has its valve 13 closed, and it is moving at a uniform rate towards the outlet, so that it is delivering liquid thereto through the open valve 16. The piston-member 15 is moving at the same rate towards the left, and this movement is then stopped. Whilst the uniform movement of the piston-member 12 continues, the piston-member 15 is returned, on its quick return-stroke, with the valve 16 open, towards the right. Its motion is then reversed and accelerated until it is moving at the same rate as the piston-member 12 which is now reaching the end of its period of uni form movement towards the left. When the two pistons are moving at the same rate towards the left, the valve 16 is closed. The delivery of liquid to the outlet 18 is thereupon effected by the piston-member 15. The

piston-member 12 which still has its valve 13 closed, is therefore still delivering liquid towards the outlet, but this liquid is accommodated by the movement of the pistonmember 15 towards the outlet; in other words, a body of liquid is trapped between the valve 13 and the valve 16 and is moved avith them towards the outlet, but is shut off therefrom.

Before the piston-member 12 ceases its period. of uniform movement, the valve 13 is opened, and immediately thereafter the pistonmembcr 12 reaches the end of its delivery-stroke towards the left. The continued movement of the piston-member 15 towards the left draws in liquid from the inlet 11 through the valve 13 so that the whole apparatus remains full of liquid and the rapid return-stroke of the piston-member 12 towards the right is effected. This does not interfere with the inflow of liquid to the space behind the valve 16, since the valve 13 is open.

Before the piston-member 15 reaches the end of its period of uniform delivery, the piston-member 12 returns to the right, rcverses its movement and. commences its period of uniform movement towards the left. Immediately thereafter, the valve 13 is closed, so that the two pistonsare moving left with both valves closed, the piston-member 12 being on the early part of its period of uniform delivery, and the piston-member 15 approaching the'end of its period of uniform delivery. The valve 16 may now be opened and the uniform delivery of the liquid to the outlet 18 is continued by the pis ton-member 12, since its valve 13 is closed. This completes the cycle of operations, for the various parts have returned to the position and arrangement indicated in Figure 1, at which the description of the cycle commenced.

The space between the valves 13 and 16 constitutes the accommodating chamber above referred to; it might be described as a reciprocating pump which is supplied with liquid on its suction-stroke through the valve 13 whilst that valve is moving to the right, and the valve 16 (closed) is moving to the left. Its delivery-stroke is effected by the movement of the valve 13 (closed) towards the left, whilst the valve 16 (open) is moving towards the right. The delivery takes place into the cylinder 17.

Turning now to the practical embodiments of this invention, the construction illustrated in Figures 4 and 5 comprises a body-portion 19 which is conveniently formed as'a casting and is provided with a through-bore 20 which is closed by plugs 21. Two cylindrical bores 22, 23, which are parallel with one another, communicate with the space 20, and serve as cylinders for hollow piston- members 24, 25, respectively. These pistons are provided with valves 26, 27 respectively, and at their upper ends they engage with cylinders 28, 29. respectively. In this construction the cylinders 28, 29 are formed as separate parts, and one of them, 28, communicates by a lateral port or branch 30 with the supply-pipe for the fluid and the other cylinder communicates with a lateral port or branch 31 to constitute the outlet or delivery-device. The whole device is supported by three pegs or the like 32, whereof one is formed on each of the parts 19, 28, 29 respectively. The parts are supported endwise by means of brackets 33, 34, and laterally by brackets 35, 36, which also hold the plugs 21 in position- It will be seen that this construction provides perfect flexibility for the whole ap ar'atus, and avoids any possibility of trou le The operation of this device is exactly similar to that described with reference to Fig ure 1, the piston 24 corresponding to'the piston 12, the chamber to the cylinder 14, the piston 25 to the piston 15, the inlet to the inlet 11, and the outlet 31 to the outlet 18.

The construction illustrated in Figures 6,

7 and 8, is simpler, in that the various features designed to permit self-alignment of the parts are omitted. Two castings 39, are each provided with a pair of bores 41, 42 and 43, 44, respectively. The cylinders 41, 42 communicate with the inlet 45 and the outlet 46 respectively, and the two cylinders 43, 44 are put in communication with one-another by a passage 47. This passage is conveniently formed by drilling through from the outside and the opening 48 is closed by a removable plug 49.

Hollow pistons 50, 51, provided with valves 52, 53, respectively, are reciprocated each in a pair of cylinders in a similar manner to the construction illustrated in Figures 4 and 5, any suitable mechanism being used for reciprocating the cylinders and operating the valves according to the cycle of movement hereinbefore described with reference to F igure 1.

It will'bc appreciated that the general construction of the device is simple and inexpensive, and moreover, it is such that the parts can be very readily taken apart, cleaned and reassembled in a minimum of time by unskilled labour.

It will be understood that the invention is not limited to the specific constructions here inbefore described, for obviously the genera design .of the Whole device is such as lends itself to many modifications in its practical embodiments, and all such are held to lie within the scope of this invention.

What I claim as my invention and desire to secure by Letters Patent is:

1. In pumping apparatus, the combination of a body portion having two cylindrical bores communicating with one another, a tubular piston reciprocable in and projecting from each of said bores, a memberhaving a cylindrical bore engaging the other ends of each of said pistons, and taking its alignment therefrom, and abutments engaging endwise .said body-portion and said member to prevent separating movement thereof;

2. In pumping apparatus, the combination of two pump chambers in series with one another, a piston reciprocable in each of said chambers, so that it has a period of uniform motion in the delivering direction which overlaps the corresponding period of the other pump, valves in said pistons, and means for operating said valves.

In testimony whereof I affix my signature.

ERNEST LUN GE.

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