US2091499A

US2091499A - Pump

Info

Publication number: US2091499A
Application number: US714509A
Authority: US
Inventors: Aldrich M Brown
Original assignee: FRED E WEST; LEWIS LERIO JR
Current assignee: FRED E WEST; LEWIS LERIO JR
Priority date: 1934-03-07
Filing date: 1934-03-07
Publication date: 1937-08-31
Anticipated expiration: 1954-08-31

Description

PUMP

Filed March 7, 1934 2 Sheets-Sheet 1 Enventor.

I I i I A,MBmw/a citton lcga/ A. M. BROWN Aug. 31, 1937.

PUMP

2 Sheets-Sheet 2 Filed March '7, 1934 I still Patented Aug. 31, 1937" PATENT OFFICE PUMP Aldrich M. Brown, Mobile, Ala., assignor of onethird to Fred E. West, one-third to Louis Lerio, and one-third to Lewis Lerio, Jr., all of Mobile,

Application March '2, 1934, Serial No. 714,509'

- 14 Claims. (01.103-183) This invention relates to pumps in general, but more particularly to motor-operated water pumps, and has for one of its objects to provide a simplified and unitary construction which 5 may be manufactured and sold as a unit.

Another object of the invention consists in providing a pump with a bleeder or unloading device so that the load on the pump at starting will be negligible, thereby permitting the use of a 10 split-phase motor which has a low' starting torque but which quickly builds up to the power of the more expensive repulsion-induction motor.

Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings, in which, a a

Figure 1 is a vertical sectional view through the pump and operating parts.

Figure 2 is a side elevational view of the pump.

Figure 3 is a fragmentary horizontal sectional view taken on line 3-3 of Figure 1.

Figure 4 is a fragmentary detail view of a slightly modified form of pump, and

Figure 5 is a fragmentary sectional view of a.

further modified construction. Referring to the drawings in more detail, the numeral I indicates the tank of the pump, and is provided with a discharge pipe 2 leading to a house or other point to be supplied with water.

' 30 An' electric motor 3 is mounted on the side of tank I and through belt 4 drives pulley 5 which is fixed to the operating shaft 6 of the pump.

An automatic switch I is provided in pipe 2 and serves to shut down and start up the pump in 35 response to varying pressures in tank I.

The shaft 6 is mounted in bearings 8 which are positioned in sleeves or tubes 9 extending inwardly from diametrically opposite sides of the tank. A packing IU of leather or the like is provided for that end of the shaft extending through the tank wall and is tapered as'indicated by numeral ll so as to readily press against the shaft in accordance with the water pressure in the system. For the purpose of improving the seal between the packing and shaft a series of annular grooves l2 are formed in the shaft. The

outer end of packing- I0 is providedwith a flange l3 which overlaps the end of the sleeve 9 and a cap l4 serves to clamp the flange against the sleeve to provide the necessary seal. The outer end of the other sleeve '9 is closed by a plain threaded cap l provided with a sealing gasket l6. 1 I

A pair of oppositelydisposed eccentrics I1 7 55 formed on a sleeve l8 are detachably fixed to the shaft 6 as by means of a screw or the like l9, and function to alternately reciprocate the pump rods 26 which are provided with the eccentric straps 2i. Rigidly connected to the lower ends of the rods 26 are the pistons comprising the annular washers 22 secured between the two metal clamping members 23 and 24.

The pistons 22 operate in a pair of cylinders 25 bored out of a solid block and seated on theupper end of a casing 26 and against the lower open end of the tank l. The casing 26 is removably secured in position by nuts 21 which are threaded onto bolts 28 extending through openings in lugs 29 on the lower end of the casing.

The pistons 22 are provided with passageways 36 which are closed on the. upstroke by springpressed valves 3|. Also, the lower ends of the 6 cylinders 25 are provided with apertures 32 for the entrance of water into the cylinders on the upstroke of the pistons, and with spring-pressed valves 33 to close these apertures on the downstroke of the pistons. A gravity valve 34 is provided for closing the entrance to casing 26 when the pump is shut down.

The casing 26 and cylinder block 25 provide an annular compartment which constitutes both a vacuum and a pressure chamber for the pump, and in order to equalize the pressure between tank I and casing 26 after the pump ceases operation a bleeder or by-pass is provided. This elevment is indicated in the pump shown in Figures 1, 2, and 3 by the numeral 35, and consists of a passage of rather small diameter bored vertically through the cylinder block and providing limited communication between the tank I and casing 26. By this construction the pressures in the tank and the casing become equalized after the pump stops and thus the load on the pump is removed thereby permitting the pump to be restarted by a motor having an initial low torque, such as a split-phase motor. A screen 36 is pref erably installed at the upper end of the passage 35 to avoid clogging. v

The lower end of the casing 26 is'provided with an entrance conduit 31 threaded at its lower end and adapted to be screwed onto the upper end of a. well pipe or into an opening 38 formed in a stand or base member 39. This member is also provided with a lateral opening 40 in which may be threaded a pipe section 4| leading to the well, and a vertical opening 42 adapted to receive the upper end of the well pipe depending upon the particular condition encountered in installing the pump.

In the modified form of the invention shown in Figure 4 the pump' is essentially the same as that just described except that the by-pass or bleeder 35 is omitted, and means are provided for temporarily permitting a free circulating of liquid through the pump. In this construction a cylinder 52 is connected across the inlet and

outlet pipes

50 and 5|, respectively, and in it is mounted a piston 53 provided with a central aperture 54 of small bore establishing limited communication between the upper and lower ends of the cylinder and likewise between the high and low pressure sides of the pump. A comparatively weak spring serves to normally hold the piston at the upper end of cylinder 52, and when the '15 pump is set in operation it withdraws water from the under side of the piston and transfers water from the tank I to the upper side of the-piston thereby causing the piston to descend until it reaches the stops 55'provided on the interior of 20 the cylinder adjacent its lower end. This moveiment of the piston at the initiation of. the pump pperation provides for the transfer of a predetermined volume of water. without difference in pressure, from one side of the pump to the other, 25 thereby avoiding the placing of a load on the pump until the motor has had sufficient time to reach its maximum power. The opening 54' permits a limited communication between the two .sides of the pump at all times, and when the tank or chamber 60 provided with a horizontal partition SI and connected to the high and low pressure sides of the pump by

pipes

62 and 63, 40 respectively. The partition is provided with an iopening 64 controlled by a spring-pressed valve 65, and a smaller opening 65 at one side of opening 64. The valve 65 is normally held open by its spring to permit the desired communication be- 5 tween the two sides of the pump, but is gradually closed by the force of the liquid flowing around it ,as the speed of the motor increases. A small dash pct 65' may be associated with the valve 55 to delay the closing of the valve; if desired. The 5 smaller opening 66 of course permits a restricted flow of fluid during the entire period of operation of the pump, andafter the pump is shut down this smaller passage permits sufliclent communication to equalize the pressures on both sides 55 of the pump and thus allows the valve 55 to re turn to its normal or open position.

In the operation of each of the three forms of the invention the by-pass or bleeder provides the necessary means to equalize the pressures on the 60 two sides of the pump immediately after the pump shuts down. In the form shown in Figures 1, 2 and 3 this equalization is performed by the liquid in the tank I being forced through passage 35 and compressing the air in the combined 65 vacuum-pressure chamber 2 6. When the motor 3 is again started the compressed air in chamber 26 will force the water upwardly in cylinders 25 as the piston reciprocates thereby postponing the placing of a load on the pump until the power of the motor has reached its maximum.

This same result is accomplished in the construction of Figure 4 in that the piston 53 is forced downwardly, thereby allowing for the desired transfer of water to the pressure side of 75 the pump without placing a load on the pump From the foregoing description and the accom panying drawings it will be apparent to those skilled in the art that I have devised an exceedingly simple and inexpensive motor-operated pump; that the pump is so designed as to permit of the use of the relatively low priced split-phase type of motor; that only few moving parts are employed; that by reason of the mounting of the operating shaft in the tank itself the advantages of a reciprocating pump are obtained without the attendant disadvantage of frequent leaks due to the difliculty of properly packing reciprocating rods; that the device is of unitary and compact formation such as will permit'of its'being sold as a unit; and that it mayin many cases be installed by merely threading the same as a unit on the upper end of a well pipe.

In accordance with the patent statutes I have described what Inow believe to be the preferred form of construction as well as two modifications thereof, but it is to be understood that various changes may be made in minor phases of the device without departing from, the spirit of the invention and all such changes are intended to be.

included within the scope of the appended claims.

- What I claim is:

1. A water pumping system including, a tank, a pump connected with and delivering into the tank, a combined pressure 'and vacuum chamber on the low pressure side of the pump, and means for establishing a restricted communication between the high and low pressure sides of the pump at all times said means adapted to extend below the surface of the liquid in the chamber.

2. A water pumping system including, a tank,- a pump connected with and delivering into the tank, a combined pressure and vacuum chamber on the low pressure side of the pump, and a passageway of relatively small capacity permitting communication between the high and low pressure sides of the pump at all times said passageway adapted to extend below the surface of the liquid in the chamber.

3. A water pumping systemincluding, a tank, a pump connected 'with and delivering into the tank, a combined pressure and vacuum chamber on the low pressure side of the pump and a passageway of relatively small bore extending through a wall of said chamber to permit continuouscommunication between thehigh and low pressure sides of the pump said passageway adapted to extend below the surface of the liquid in the chamber.

4. A water system including a storage tank, one or more pump cylinders communicating with the tank, valved pistons for said cylinders, a combined pressure andvacuum chamber surrounding the cylinders and in communication therewith, and means for establishing continuous communication between the tank and chamber around the pump.

5. In combination a vertically disposed tank, a pair of pump cylinders communicating with the lower end of the tank, pump pistons in said cylinders, means for operating the pistons. a

chamber surrounding the cylinders .and in communication therewith, a wall of one of said cylinders provided with a vertical pasage permitting communication between the tank and chamber at all times.

6. In a pumping system, a pump, inlet and outlet pipes associated with the pump, a cylinder and piston connected across said pipes, and means for maintaining the piston toward the high pressure side of the pump when the latter is shut down and allowing it to move toward the low pressure side when the pump begins its operations,

'7. In a pumping system, a pump, inlet and outlet pipes associated with the pump, a cylinder and piston connected across said pipes, and a spring for maintaining the piston toward thehigh pressure side of the pump when the latter is shut down and allowing it to move toward the low pressure side when the pump begins its operations.

8. In a pumping system, a pump, inlet and outlet pipes associated with the pump, a cylinder and piston connected across said pipes, the sides or the piston being exposed to the high and low pressure sides of the system said piston provided with a passageway constituting a bleeder between the high and low pressure sides of the pump, and means for maintaining the piston toward the high pressure side of the pump when the latter is shut down.

'9. In combination, a motor-operated pump, 0 inlet and outlet pipes associated with the pump, a by-pass connected across said .pipes, a valve in said by-pass adapted to be closed by a predetermin'ed velocity of fluid, and a bleeder passage at one side of said valve.

10. In combination, a motor-operated pump, inlet and outlet pipes associated with the pump, a by-pass connected across said pipes, a valve chamber in said by-pass, an apertured partition in said chamber, a valve for closing said aperture 0 and exposed to the high and low pressure sides 01! the system, and a spring normally biasing said valve to open position.

11. In combination, a motor-operated pump,

inlet and outlet pipes associated with the pump,

a by-pass connected across said pipes, a valve chamberin said by-pass, an apertured partition in said chamber, said partition provided with a bleeder passage, a valve for closing the aperture in said partition and exposed to the high and low pressure sides of the system, and a spring normallybiasing the valve to open position.

12. A pumping system including a storage tank, a shaft extending into the tank, a pump rod and piston operated by the shaft, a pump cylinder communicating with the lower end of the tank and in which said piston is mounted, an openended casing secured to the lower end of the tank and surrounding said cylinder and in com munication therewith to provide a combined pressure and vacuum chamber, and a check valve for the lower end of the casing, said storage tank having a capacity substantially greater than that of the casing.

13. A pumpingsystem including a storage tank, a shaft extending into the tank, a pump rod and piston operated by the shaft, a pump cylinder communicating with the lower end of the tank and in which .said piston is mounted, an openended casing surrounding said cylinder and in communication therewith and bolts extending from the bottom of the tank and attached to the lower end of the casing, said storage tank having a capacity substantially greater than that of the casing.

ALDRICH M. BROWN;