US2765745A

US2765745A - Pump

Info

Publication number: US2765745A
Application number: US489324A
Authority: US
Inventors: Harry J Sadler; Ernest E Cook
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-02-21
Filing date: 1955-02-21
Publication date: 1956-10-09
Anticipated expiration: 1973-10-09

Description

PUMP

Harry J. Sadler and Ernest E. Cook, Minneapolis, Minn. Application February 21, 1958, Serial No. 489,324

1 Claim. (Cl. 103-42) Our invention relates broadly to pumps; and in particular, relates to pumps of the type having a release mechanism for by-passing fluid from the outlet to the inlet side of the pump when excessive pressure is developed at the pump outlet.

An object of our invention is to provide an improved pump of the class described which is simple, compact, and durable in construction, more simple and easier to manufacture than any previously known similar pump structures, and which is also highly reliable and efficient in operation.

A further object of our invention is to provide an improved pump of the class described having an end cap comprising a reduced portion and a flange portion, the former telescoping into an open end of the main body portion of the pump to form a side wall of the operating chamber and the latter being provided with circumferentially spaced openings through each of which extends a headed bolt; these bolts connect the end caps to the main body portion of the pump for limited movement toward and away from the pump impeller, which is mounted for rotation in the pump chamber; and the cap is adjustably and yieldably urged into engagement with the adjacent end of the impeller.

Ihese and other objects and advantages of our invention will become apparent in the course of the following specification and claim, reference being had to the accompanying drawings wherein:

Fig. 1 is a view in plan of our invention with some parts being broken away and some being shown in section; and

Fig. 2 is a view partly in vertical section and partly in end elevation taken substantially on the line 22 of Fig. 1.

Referring with greater particularity to the drawings, wherein like parts will be indicated by the same numeral, our novel and improved pump comprises body means 10, which preferably is integrally formed and comprises the major portion of the pump housing. Body portion defines a cylindrical chamber 11 which has one open side and an opposite flat side wall 12. Body means 10 has circumferentially spaced inlet and

outlet ports

13 and 14, respectively, which open into the pump chamber 11.

A shaft 15 is journalled in a bearing boss 16 in body means 143 and extends generally perpendicular to flat side walls 12 from within the chamber 11 outwardly behind the limits of body means 10. An impeller, indicated in its entirety by the numeral 17, is anchored to the inner end of shaft 15 by any suitable means for common rotation therewith. Impeller 17 is mounted eccentrically within cylindrical chamber 11 for rotation therein on an axis defined by shaft 15. Impeller 17 may be of the rotary vane type or the gear type. Preferably, as shown, impeller 17 comprises a rotor 18 having circumferentially spaced radially outwardly opening recesses 19 formed therein, which are parallel to the axis of rotor 18 and extend throughout the width thereof, and rollers 20 which are mounted in recesses 19 for limited radial movements 2,765,745 Patented Oct. 9, 1956 2 between the bottoms thereof and the cylindrical Wall of chamber 11.

We provide a single unitary end cap 21 which is releasable in relation to the body portion 10, to be described in more detail hereinafter. The end cap 21 is formed with a diametrically reduced portion 22 which telescopes into the open end 23 of body means 10 to form the side wall 24 of chamber 11. Reduced portion 22 has an annular groove 25 in which is contained a sealing ring or the like 26. End caps 21 is formed with a circumferentially extended flange 27 having several, preferably four, circumferentially spaced openings 28 extending therethrough. The circumferentially extended portion 29 of body means 10 encompassing open end 23 has outwardly opening threaded holes 39 formed therein, one of which is to be aligned with each of the openings 28 in flange 27. Bolts 31, each having a head 32 and a threaded end 33, extend through openings 28 and are screw-threaded into threaded holes 31) to connect the end cap 21 to body means 10 for limited movements toward and away from impeller 17. Resilient means comprise several coiled compression springs 34, preferably there are four, one associated with each of the bolts 31. Springs 34 encompass bolts 31 between flange 27 and bolt heads 32 to yieldably urge end cap 21 axially into engagement with the adjacent end of impeller 17. It is clear that the bias exerted by springs 34 may be adjusted by manipulation of bolts 31.

The bias of springs 34, adjusted as aforementioned, under normal operating conditions maintains end cap 21 in engagement with impeller 17, as shown in full lines in Fig 1; however, if the pressure within chamber 11 increases to a predetermined value, end cap 21 will be moved axially outwardly away from impeller 17 to the position shown in dotted lines in Fig. l, to permit fluid to be by-passed past impeller 17 from outlet port 14 to inlet port 13. The initial tension or bias of springs 34 determines the amount of pressure which may be built up within chamber 11 before axial outward movement of end cap 21 and the resulting pressure release.

Our novel and improved pump, as herein disclosed, has been built and tested and found to accomplish all of the aforementioned objects and advantages. We have formed a structure Which is extremely simple and compact and yet efliciently and reliably operative. While we have shown a preferred commercial embodiment thereof, it will be obvious to those skilled in the art that our invention may be modified by many substitutions and equivalents and that this disclosure is intended to be illustrative only; therefore we intend to be limited solely by the scope of the appended claim.

We claim as our invention:

A pump comprising a casing having an internal axially outwardly opening cylindrical bore defining an operating chamber open at one end and closed at the other, said casing having inlet and outlet ports formed therein opening into said chamber intermediate the open and closed ends thereof, a shaft journalled in said casing for rotation and extending into said chamber generally normally through the closed end thereof, an impeller anchored to said shaft for common rotation therewith and mounted in said chamber for rotation therein, a single unitary end cap closing the open end of said chamber and releasable in relation to said casing, said cap comprising a circumferentially extended radially outwardly projecting flange and a cylindrical reduced portion, said reduced portion being axially aligned with and received in said bore for longitudinal movement toward and away from said impeller and having a radially outwardly opening channel formed therein adjacent the inner end thereof, an annular sealing member received in said channel and engaging the inner surface of said bore, said flange having a plurality of circumferentially spaced openings extending axially therethrough radially outwardly of said reduced portion each in alignment with a different one of a plurality of outwardly opening internally threaded holes formed in said casing, a plurality of headed bolts each extending through a different one of said openings and screw threaded into said casing for maintaining said end cap to said casing for limited longitudinal move ments, a plurality of coiled compression springs each encompassing a ditferent one of said bolts between the head thereof and the flange of said end cap for yieldably urging said end cap toward and into engagement with the adjacent end of said impeller; whereby, the bias of said springs may be adjusted by manipulation of said bolts. and upon an increase of the pressure within said chamber above a certain value as determined by the bias of said References Cited in the tile of this patent UNITED STATES PATENTS 1,675,079 ZisCh June 26, 1928 1,694,805 Wiltse Dec. 11, 1928 1,870,192 Butler Aug. 2, 1932 2,037,894 Grisell Apr. 21, 1936 2,134,153 Seyvertsen Oct. 25, 1938 2,462,732 Dusevoir Feb. 22, 1949 2,642,001 Dale et a1 June 16, 1953 FOREIGN PATENTS 36,212 Switzerland Mar. 1, 1906