US2394932A - Pump - Google Patents

Description

2 Sheets-Sheet 2 a o T Y 7 m m ...S V

2"mlili/l/ilwf, INA M ALEXANDER MHz/ame BY Feb. 12, 1946. A. v. MUELLER PUMP Filed Jan. 1l, 1944 arrows.

' varied greatly.

Patented Feb. 12, 1946 Alexander V. Mueller,

Salem, Ohio, assigner to The Deming Company, Salem, Ohio, a corporation of Ohio Application January 11,.4 1944, Serial No. 517,175

. 8 Claims. (Cl. 103-113) This invention relates to a self-priming pump of the type where some of the discharged liquid is returned to the suction s ide of the pump to effect the priming and there is automatically acting means to shut off such returning liquid when no longer needed.

The general object of thev invention is to provide a self-priming pump having discharge and suction passageways with a communication between such passageways, extraneously of the impeller, closed during the normal operation of the pump but available whenever necessary to supply priming liquid to the impeller independentof the relative pressuresl in such passageways. To this end, I have so arranged my pump that the recirculation of liquid is controlled by the fluid pressure in the dischargepassageway andis independent of the pressure in theinlet passage way, whether'the pump has been standing and its operation just started or whether it loses its prime during operation.

A further and particular object of the invention is to devise a self-priming pump with a control of such character, and so connected for operation, that stopping of the recirculation shall not be affected by vacuum or reduced pressure in-the suction conduit to the impeller but shall take lplace equally well with slight or great negative pressure in such conduit.

Other objects and features of the invention will be apparent from the following description of a preferred embodiment ofthe invention illustrated A in the drawings.

-it in the closed position; Figure 4 is a radial section of the controllingdevice taken on the linel 4-4 of Figure 3 looking in the direction of the As shown in Fig. 1, Ill designates a suitable pump frame having a vertical end plate ll. 20 designates the driving shaft which is shown asA mounted in a frame-,carried bearing 2l and embraced by a stuffing box sleeve 22 mounted in a cylindrical portion I2 of the frame. On the end of the shaft shown is keyed the impeller 30 which is shown as having a disc portion 3l bearing, in a complementary recess` in the frame member Il and as carrying suitable vanes 32. The construction ,described is merely illustrative and may be The impeller vanes 32 operate in an impellerl casing 40, shown as of volute form and as having a central suction intake passageway 4I leading to the eye of the impeller and a suitable dis# charge orice 42. This "volute impeller ycasing 401s shown as an integral part of a casting providing the discharge and suction passageways and a chamber for the valve but, if desired, all ofthese parts may be 'separate casings secured together.

In the form shown, the liquid passageway to the pump comprises a suction chamber 44 leading from the suction inlet 45, preferably as high as the top of the impeller, thence leading downwardly and inwardly at 46 to the eye of the impeller. The casting provides a discharge-chamber 41 into which the orifice 42 empties, which discharge passageway is shown as terminating above in a discharge orifice 48 and as continuing downwardlyA below the suction conduit 4I into the space designated 49.

' 50 and 5I designate the outer wall of. the dis.

charge chamber. The wall 50 leads downwardly from the discharge orifice 48 until it merges with the suction conduit 4I while the4 wall portion 5|'- continues downwardly to the base of the chamber portion 49. A suitable barrel-like wall 53 connects with the walls 50 and 5I at the outer edge and with wa1ls54 and 55 at the'inner edge. These inner` walls terminate in the same vertical plane where they abut the vertical face of the pump member Il to.-which they are bolted. One of such bolts is shown at 60 and there is preferably an interposed gasket 6I between these parts. The recirculating valve is carried in a chamber 10 of its own shown as provided by the same casting which provides the suction and discharge chambers. Figs. 1 and 3 show'rig'id extensions of the outer walls of these chambers furnishing a wall 12 of general conical form which at its upper end continues at a sharper angle and merges with horizontal under portion o f the suction conduit 4| and on the vertical side with the Wall 5I. At the outer end of the conical portion 12 the walls are flanged inwardly at 13 to provide a at face having a central opening. Mounted in this opening is the casing 8 0 of the lrecirculating valve, which I will now describe.

The casing 80 has at its outer end an annular flange 8| lying against the frame wall 1 3. Then `the casing is shown as extending inwardly in a conical form at- 8.2 to a partition portion 83. Beyond theA partition the casing 84 as a cylindrical member. This cylindrical member is mounted within a cylindrical flange` 15 of the general casting.

-90designates a cap secured to the ange 8l ofthe valve, and 92 a diaphragm having its pe-` ripheral margin between thecap and flange, the cap and diaphragm being clamped in place by suitable cap screws 94. Clamped to the diaphragm by internal and external plates 95 is a 'fitting 96 to which-is pivoted a rod 91 carrying the valve. T he rod 91 is shown asextending wall extends at partition' 83.

The movable portion of the valve comprises a sleeve having an internal spider |0| in which the end of the rod 91 is threaded. so ,that the rod, when operated by the diaphragm to which it is attached, may operate Vthe sleeve. A suitable spring, which may be a helical compression spring ||0, is mounted between the diaphragm and cap 90 and tends to' maintain the sleeve valve in the position shown in Fig. 1.

Extending through the wall of the valve cylinder 84 are openings |20 communicating with the annular valve chamber 10. The drawing shows a suitable conical screen |2| surrounding the openings 20. An opening |25 through the wall 5| connects the general discharge chamber with the valve chamber. Likewise an opening |26 connects the valve chamber with the suction conduit 46, and is formed and positioned to make a nozzle directed toward the eye of the impeller.

There is also anopening |28 through the head portion 82 of the valve casing linto the space between the partition 83 and the diaphragm.

It results from the construction described that when the valve parts are in the position shown in Fig. 1, there is an open passageway from the discharge chamber 41 and its lower portion 49 through the opening |25 to the valve chamber and thence through the openings |20 to the'interior of the valve cylinder and then axially through the valve and the passageway |26 to the suction conduit 46. This passageway, however is closed whenever the valve is in the position shown in Fig. 3, whereA the sleeve bridges the openings |20 and interrupts the passageway.I y

I prefer to provide a self-closing valve at the suction intake 45. As shown in Fig.l 1, this is provided by an annular member |30 carrying a disc valve |3| hinged to the annular member at |32, and coacting with the inner face thereof. |35 indicates an annular member internally threaded for the attachment of the suction pipe. These two annular members are secured together upon an interposed gasket |36 and such parts secured to the pump casing upon an interposed gasket |31 by suitable cap screws |38.

Describing the operating of the parts shown,

and assuming thatA the pump is standing after having been used, there will be water in the suction passageway 46 below the suction Valve chamber and the valve will be open las shown in Fig. 1. Now when the pump starts this water primes the pump, and the rotation of the impeller carries water from the suction passageway through the orifice 42 of the volute casing into the upper portion of the discharge chamber 41 and its lower portion 49. Some of this water passes through the ports |25 and |20 into the interior of the valve and thence through the passageway |26 into the suction passageway 46. There is thus a recirculation from the discharge chamber into the suction chamber and this continues to supply liquid to the impeller even though air may be drawn in with the incoming liquid through thel `suction passageways.'

. through a suitable guiding bushing carried by the moved along its seat and over the openings |20 to close the same, the valve thus coming into the position shown in Fig. 3.

The closing of the valve by the pressure in the discharge chamber shuts off the recirculation of the liquid, and thereafterthe pump operates to receive liquid from the suction passageway 4B' and discharge the entire amount to the delivery pipe without loss by reason of recirculation.

If at any time during the operation of the pump, air reaching the impeller interferes With the 1mpeller throwing a solid stream of water, the resulting diminution in pressure in the discharge chamber relieves the pressure through the opening 28 against the diaphragm and the spring ||0 thereby moves the diaphragm and valve to open the ports |20. This enables circulation from the discharge chamber to the suction chamber and results in the priming being reestablished.

It will be`noticed that the passageway |26, which as heretofore stated forms a nozzle, discharging toward the eye of the impeller, is comparatively close to the impeller, so that a small amount of liquid coming-through this passageway may be effective in priming the pump. The

passageway |26 is'quite small in comparison with causes such need also causes the valve to open,

so that priming automatically takes place.

It will -be further seen that by reason of the sleeve valve shown the valve is not subjected to improper action resulting from the vacuum or reduced pressure in the suction passageway. If the rotating impeller should draw fluid faster than the same can be supplied through the suction opening, or should the suction valve fail to open, this reduced pressure does no harm since the open sleeve of the valve allows the same pressure to exist on each end thereof and hence the valve situation as controlled by the discharge pressure is not changed.

Pumps of this type are frequently used for drawing up water for a considerable height and simply allowing it to spill over from the discharge chamber as, for instance.. in draining sumps, mines, etc. Accordingly, there is liable to be very little positive head pressure on the discharge side while there may be a decided negative pressure on the suction side. On'the other hand, the situation may be reversed and the pump may ldraw water from a low level and deliver it to a conslderable height, lthus causing comparatively great positive pressure and a small negative pressure.

My control valve is designed to meet such varying situations by being independent of the pressure conditions in the suction line.

the valve and shut of! the priming water, By

making the spring ||0 light enough a very small f pressure head may be sumcient to seat the valve in opposition to such spring.

vMoreover should dirt` or other foreign matter get past the screen I2| into the interior of the valve, this does no harm as the same can pass readily through the `valve and thence be dis- Hence, ex cessive suction has no effect in tending to seatv not needed.

charged through the openlng ,l`2 into `the suction through the valve sleeve to the suction conduit,

chamber.` f

My valve is simple in construction, there is nothing about it to get out of order and it may be readily mounted in place in its chamber and thus incommunication with both the discharge and suction passageways. n the other hand, the

valve may be readily removed whenever it is de` sired to clean the embracing screen or for any other purpose.

I claim: 1. In a pump, the combination of `an impeller,

a casing therefor having a suction oriiice anda pressure .discharge orlnce, a conduit leading to said suction oriilce, a conduit for pumped liquid leading from the pressure discharge orince,- a return 'passageway lfrom theV pressure .conduit terminating in a nozzle discharging into'the suction conduit toward the impeller, said nozzle being of a casing Itherefor having s side inlet 'and a dischargev outlet, a suction conduit leading to the side inlet, anda conduit for pumped liquid leading from the discharge outlet', a return passage.- way from the pressure conduit terminating in a nozzle discharging into the suction conduit toward the eye of the impeller, and m`eans controlled'by the static pressure above atmospheric pressure in the pressure conduit and independent oi the suction inthe'suction conduit'tor closing said return'passageway' when priming liquid is 3. In a pump, the'combination oi.' an impeller, a suction inlet conduit and a discharge conduit, a passageway for recirculating liquid from the discharge sideof the impeller to the suction side', and a device tor-controlling said passageway having a cylinder with a port and a slidable hollow sleeve within the cylinder 'adapted to 4closethe Port. said port and said sleeve when not `covering the port forming a portion of said passageway.

and a diaphragm subjected to the pressure of the 4. In a pump,the combination1 an peller of means deping a suction passageway leading to the Vimpcllerand a discharge. passage.-

way leading from thefimpeller, a valve chanribexjv in. communicationy withthe discharge passageaild pressure control means'ifor' 'operating' the v ve. j

5. In a pump, the combination, withganimpeller. oi.' vmeans denning a suction.passageway wayleading from the impellerravalve chamber in communication withthe dischargepassageway, a valve casing in said chamber having ,a barrel with a port through it, an open-ended a diaphragm, a rod connecting the diaphragm to the valve sleeve, a spring acting against one side of the diaphragm and tending to move the valve to open position, and means for admitting pressure fluid from said valve chamber to the interior ofV the. valve case to act against the other side of the diaphragm to close the valve.

6. A pump vhaving a suction chamber and a discharge chamber, a valve construction comprising a valve casing having a body and'a cylinder separated by a partition, there being a port through the wall of the cylinder in open communication with the discharge chamber, an open ended sleeve valve in the cylinder adapted to vcover or uncover said port and having its interior in communication with the suction chamber, a

rod for operating the sleeve valve connected to it and passing slidably'through the partition, a diaphragm across the body of the valve casing and connected to the rod, a spring tending to move the diaphragm in one direction, and a port discharged liquid and adapted vto operate the isleeve. i f

through said casing body adapted to admit iluid from the discharge chamber to the space between the diaphragm and partition, to move the diaphragm in the opposite direction.

7. In a pump, the combination, with means providing a discharge chamber and a suction chamber, of a valve chamber in open communivcation with the discharge' chamber,`a valve in lthrough the wall of the cylinder in communica- .tion withfthe'valve chamber, a 'port through the head in communication with the valve chamber, a diaphragm across thehead, a cap clamping the diaphragm against the head, a helical spring between the'cap and diaphragm tending to move the diaphragm toward the partition, a sleeve valve in the cylinder, a rod passing through the partition and connecting the sleeve valve with the diaphragm,a port through the headoi the valve casing between the diaphragm and partition, whereby pressure in the valve chamber may operate the diaphragm in opposition to the spring to move thevalve across the port of its cylinder, the. space within the valve communicating with the suction chamber of the pump, whereby diminished discharge pressure in the 'pump' resultsin a .recirculation of the liquid from the discharge chamber through the valve to the suction cham- ..ber.

. 8. A. pump having a suction chamber and a discharge chamber, -a removable valve casing in- "serted in a region in open communication with the discharge chamber, said valve casing having i Yu .bodyv-portionl with an annular flange by which vitis securedin place and with a cylindricalporleading tothe impeller and a diseharse passageltion' and a-partition between thebodyand cynn- .I drical. portion, a sleeve valve in the cylindrical portion controlling a port. through the wall thereof, and having it interior in communication with the suction chamber, a screen surrounding the valve casing and secured thereto outside of said port, a diaphragm within said casing connected with'the sleeve valve, and means for subsleeve valve in the barrel adapted-to close thel Jecting the diaphragm tothe in the-discharge chamber. y

ypressure oi! liquid

Images