US2109804A

US2109804A - Self-priming pump

Info

Publication number: US2109804A
Application number: US523776A
Authority: US
Inventors: Arthur C Saxe
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-03-19
Filing date: 1931-03-19
Publication date: 1938-03-01
Anticipated expiration: 1955-03-01

Description

March. 1,1938. A. c. sAxE SELF PRIMING PUMP Filed March 19, 1931 ARTHUR C.S'AXE' Patented Mar. 1, 1938 UNITED STATES PATENT OFFICE SELF-PBIMING rum Arthur 0. Sate, Columbus, Ohio Application Mai-ch19, 1931, Serial No. 523,776

a Claims. (01. 103-113) v This invention relates to self-priming centrifugal pumps, theobject being chiefly to provide an improved construction whereby a by-pass having a valve between the discharge and suction chamhers is closed by the impact of the suction line water when the air or gases have been exhausted from said line. Other objects will appear from the disclosure. v

The invention is embodied in the example herein shown and described, the features of novelty being finally claimed.

In the accompanying drawing- Figure 1 is vertical section on the line 1-! Fl 2 with parts in full and broken out.

.Fig. 2 is a view in elevation looking at the righthand side of Fig. 1 with the suction line removed.

Fig. 3 is a view like Fig.1 of a modification. the

section being taken on the line III-III Fig. 4.

Fig. 4 is an elevational view looking atv the right-hand side of Fig. 3.

Referring first to the views, Figs. 1 and 2. the character 5 designates the ordinary impeller which is housed in a usual or suitable manner but has, in the present instance, a chamber 6 constituting a suction or intake chamber. Mounted above the impeller housing and intake chamber are a priming water and discharge chamber 1 and a chambered portion 8 forming an extension of the intake chamber b'ut leading downward into the suction chamber 6. The suction line 9 has a check valve at 9, for example, at its lower end and is connected at its upper end with the chambered portion 8.

The discharge from the impeller chamber ex- 5 tends upward from the bottom of the housing into the discharge chamber 1 through a passage ID in the rear.

The discharge chamber I communicates with the suction chamber 6 by means of a passage H formed with a valve seat, a valve I! being pivoted, as shown, in said passage, said valve adapted when suitably rocked to open and close the passage. Said valve l2 carries at its upper side within the discharge chamber I an arm I! on which is secured a weight I; and said valveat its lower sidewithin the suction chamber carries an. arm with a blade IS. The weight I4 is of sumcient mass when placed at a given point on the arm II to hold the, valve l2 normally in open position and with the blade Ii opposing the inlet to the suction chamber. When, in operation, air or gas, or water carrying a considerable quantity of air or gas, enters the suction chamber the blade and valve are not actuated; but when the water is substantially freed from gas it presses the blade to rock the valve to closed position, where it is held until released by reason of the presence of air or gas again coming from the suction line. It will be noted that the priming port II which leads from the priming fluid container to the im- 5 peller chamber is of less area than the port leading from the suction chamber into the impeller chamber.

The operation is this: 0

To prime the pump water is supplied through 1 the discharge or priming hatch 1' of the discharge chamber until such water reaches the level fixed by the opening of the suction line and the rotation of the impeller is started. The rota- 15 tion of the impeller first exhausts a mixture of air or gas and water from the suction chamber, after which both water and air or gas come together from the.suction line, and finally water alone. When water alone is drawn from the suction line its impact or pressure on the blade I5 50 urges that member downward and the valve to closed position. after which water alone is pumped through the suction line until exhausted from the sourceat the foot of the suction line.

It will be noted from Figures 1 and 2 that the 25 arm I! and weight ll are so arranged that weight II has its greatest oment'arm about the pivot of valve l 2 when the latter is open. This moment arm decreasesas the valve moves towards closed position and as the member l5 moves out of the 39 direct path of liquid in the suction line. The result is that there is a tendency for the valve to be kept open until the velocity head of fluid in the suction line reaches a selected degree but when the valve is once started towards closed 35 position, closing of the valve is facilitated by decrease in the length of the moment arm.

It will also be noted from Figures 1 and 3 that when the valve is closed, it is slightly hydrostatically unbalanced so that the unbalanced hydrostatic pressure will aid in keeping the valve closed. From these figures lt'will be noted that the upper surface of the valve I2 is so arranged that that portion of the area which is disposed to the right of the pivot pin thereof is of greater 45 area than .that portion which is disposed to the left of the pivot pin. This difference in area brings about the hydrostatic unbalance of the valve so that the pressure in the chamber I- acting on the upper surface of the valve tends to 50 keep the valve closed. However, as soon as the velocity head in the suction line acting on the, blade I! 1 falls below the selected degree, the weight" will be'sufilcient to overcome the hydrostatic unbalance and open the valve. 55

In this operation it will be noted that the priming water merely churns around in the impeller housing and discharge chamber until all the air or gas is exhausted from the suction line and suc- 5 ,tion chamber, but that when the water, minus the air or gas begins to flow, that is when the pump is primed, the pumped water is discharged through the hatch I of the discharge chamber.

In Figs. 3 and 4, the parts aresubstantially the same and are correspondingly designated except that the suction chamber, as shown at 6*, has greater upward extension and to a point sub-- stantially in line with the top of the discharge chamber. The modification shown permits a large quantity of priming water to be initially supplied to the pump, the level of which as in the former case can be at the bottom of the connection of the suction line with the extension intake chamber. With such construction no foot or check valve is required in the suction line to prevent loss of water by syphoning, which loss may occur when the operation of the pump is stopped;

The forms of the parts can be changed without departing from the gist of the invention as claimed. a v

What I claim is: 1. A self-priming centrifugal pump comprising an impeller chamber, a suction line leading into said impeller chamber, an impeller in said chamber, a container for priming fluid associated with said chamber, a port leading from said container to said impeller chamber, a discharge passage leading from said impeller chamber, a valve for controlling said port to admit priming fluid to said impeller chamber when open and to substantially exclude priming fluid therefrom when closed, and means for holding said valve open.

to admit priming fluid to said impeller chamber untihthe air is substantially exhausted from the suction line and until a fluid flow with a selected svelocity head is established therein and thereafter closing said valve and maintaining it closed while this condition continues to exist,

said last named means comprising a bame member of less area than the cross-section of the suction line projecting into the path of flow of the fluid therein but movable substantially entirely out of said path of flow by the action thereon of said selected velocity head of: fluid, and a weight associated therewith and pre-selected to prevent initiation of the closing movement of said valve untilsaid member is subjected to said selected -velocity head of fluid, said weight being so related to said valve that movement of the valve towards closed position decreases the effectiveness of the weight as said baiile member moves away from the center of flow.

2. A self-priming centrifugal pump comprising an impeller chamber, a suction line leading into-said impeller chamber, an impellerin said chamber, a container for priming fluid associated with said chamber; a port leading from said con-i tainer to said impeller chamber, said port being of less area than the port leading from the suction chamber into the impeller chamber, a discharge passage ieading from said impeller chamber, a valve for controlling said port to admit priming fluid to said impeller chamber when open and to substantially exclude priming fluid therefrom when closed, means for holding' said valve open to admit priming fluid to said impeller chamber until the air iss'ubstantially exhausted from the suction line and until a fluid flow with 76 aselected velocity head is established therein and thereafter closing said valve and maintain ing it closed while this condition continues to exist, said last-named means comprising a ballle member of less area than the cross-section of the suction line projecting into the path of flow of the fluid therein but movable substantially out of said path of flow by the action thereon of said selected velocity head of fluid, and a weight associated therewith and preselected to prevent initiation of the closing movement of said valve until said member is subjected to said selected velocity head of fluid, said weight being so related to said valve that movement of the valve towards closed position decreases the efiectiveness of the weight as said baflle moves away from the center of flow, said valve being slightly hydrostatically unbalanced when in closed 'posi- 3. A self-priming centrifugal pump comprisa ing an impeller chamber, a suction line leading into said impeller chamber, an impeller in said chamber, a container for priming, fluid associated with said chamber, a port leading from said container to said impeller chamber, said port being of less area than the port leading from the suction chamber into the impeller chamber, a discharge passage leading from said impeller chamber, a valve for controlling said port to admit priming fluid to said impeller chamber when open and to substantially exclude priming fluid therefrom when closed, means for holding said valve open to admit priming fluid to said impeller chamber until the air is substantially exhausted .from the suction line and ,until a fluid flow with a selected velocity head is established therein and thereafter closing said valve and maintaining it closed while this condition continues to exist, said last-named means comprising a ,bame member of less area than the cross-section of the suction line projecting into the path of flow of the fluid therein but movable substantially out of said path of flow by the action thereon of said selected velocityhead of fluid, and a weight associated therewith and preselected to prevent initiation of the closing movement of said valve until said member is subjected to said velocity head of fluid, said valve being slightly hydrostatically unbalanced when in closed position so that the unbalanced'hydrostatic pressure will aid in keeping the valve closed, said weight being into said impeller chamber, an impeller in said I chamber, a container for priming fluid associated v ng from said conwith said chamber, a port leadi tainer to said impeller chamber, said port being of less area than the port leading from the suction chamber in'to the impeller chamber, a discharge passage leading from'said impeller cham-' ber, .a valve for controlling said DQrttoadmi't from when closed, means for holding said valve.

open to admit priming fluid to said impeller chamber until the air is substantially exhausted from the suction line and until a fluid -flow with as'electedvelocityhead-istherein and thereafter closing said valve. and maintaining it closed while this condition continues to exist, said last-named means comprising a bame I an impeller chamber, a suction line leading into' member projecting into the path of fluid flowing through the pump ,and a weight associated said impeller chamber, an impeller in said chamber, a container for priming fluid associated with said chamber, a port leading from said container to said impeller chamber, said port being of less area than the port leading from thesuction chamber into the impeller chamber, a discharge passage leading from said impeller chamber, a valve for controlling said port to admit priming fluid to said impeller chamber when open and to substantially exclude priming fluid therefrom when closed, means for holding said valve open to admit priming fluid to said impeller chamber until the air is substantially exhausted from the suction line and until a fluid flow with a selected velocity head is established therein and thereafter closing said valve and maintaining it closed while this condition continues. to exist, said valve being slightly hydrostatically unbalanced when in closed position so that the unbalanced hydrostatic pressure will aid in keeping the valve closed, saidlmeans including a member for overcoming the slight hydrostatic unbalance to open the valve'when the velocity head of fluid inthe suction line falls below the selected degree.

6. A self-priming centriiugal pump comprising an impeller chamber, a suction line leading into said impeller chamber, an impeller in said chamber; a container for priming liquid associated with said chamber and disposed directly adjacent -to said suction line, a port leading i'rom said container into said suction line, port being of less area than the port leading from the suction line into the impeller chamber, a discharge e leading from said impeller chamber, a valve for controlling said port to admit priming liquid to said impeller chamber when open and to substantially exchide priming liquid therefrom when closed; means for holding said valve open to admit priming liquid to said impeller chamber 'until the air is substantially exhausted from the suction line and until a fluid flow with a selected velocity head is established therein and thereafter closing said valve and maintaining it closed while this condition continues to exist, said lastnamed means comprising a baiiie member connected to said valve and located in the suction line, said baiile member being of less area than the cross sectional area of the suction line and projecting into the path of flow oi the liquid therein but being movable substantially out of said path of flow by the action thereon of said selected velocity head of liquid, and an arm connected to the valve and projecting from the opposite side of the priming port into said priming liquid container, 'said' arm carrying a weight which is disposed in said priming liquid container andfwhich is preselected to prevent-initiation oi the closing movement of said valve until said weight as said baiile member moves away from the center of flow, said valve being hydrostatically unbalanced when in closed position so that the unbalanced hydrostatic pressure will aid in keeping the valve closed, the decrease in eiiectiveness of said weight and the unbalanced hydrostatic force serving to compensate for the decrease in efl'ectiveness of the velocity head force produced by movement of the baiile member away from the center of flow said weight being sumcient to overcome the hydrostatic unbalance to open the valve when the velocity head oi liquid acting on saidbaiile member falls below the selected degree.

AR'I'HUR C. saxn.

bai'le member is subjected to said selected ve- 'locity head of fluid, said weight being so related to said valve that movement of the valve towards closed position decreases the eflectiveness of the