US2690716A - Rotary pump - Google Patents

Description

1954 B. H. M LAUGHLIN ,690,

ROTARY PUMP Filed Dec. 29, 1952 2 Sheets-Sheet l Fig.

Fig.5

Fig. 4

Barrett H. McLaughlin INVENTOR.

Oct. 5, 1954 Filed D60. 29, 1952 B. H. MCLAUGHLIN 2,690,716

ROTARY PUMP 2 Sheets-Sheet 2 Barre/I H. Mafia (541 BY @Mm Patented Got. 5, 1954 ROTARY PUMP Barrett H. McLaughlin, Whitinsville, Mass.

Application December 29, 1952, Serial No. 328,446

1 Claim. 1

The present invention relates to new and useful improvements in rotary pumps and compressors.

An object of the invention is to provide a double acting abutment pump which Works on the principle of increasing a volume within the pump; trapping the liquid which has been pulled in; con necting the volume with a discharge; and decreasing that volume.

Another object is to provide a rotary pump of improved eiiiciency, which is simple and practical in construction, relatively inexpensive to manuiacture, and otherwise well adapted for the purpose for which the same is intended.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanyin drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a top plan view;

Figure 2 is a sectional view taken on a line 2--2 of Figure 1;

Figure 3 is a sectional view taken on a line 3-3 of Figure 2;

Figure 4 is a sectional view of the pump housing with the end plate and impeller removed, and

Figure 5 is an enlarged sectional view of one of the abutments.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of my invention, the numeral 5 designates a pump housing formed with a circular pump chamber 6 and provided with a removable end or cover plate 1 secured to the housing by studs or bolts 8.

An inlet port 9 is formed in the top of the housing having a substantially rectangular shaped throat iii extending substantially the entire width of chamber 6 and positioned substantially tangentially wtih respect to the chamber and an outlet port 1 l is formed at one side of the housing and is provided with a throat l2 shaped similar to and entering chamber 6 adjacent throat it and positioned radially with respect to chamber B.

An abutment I3 is slidable in a pocket Hi formed in the housing between throats l0 and [2, the outer end of the pocket being closed by a cover plate is secured to the housing by bolts [6 and a pair of guide pins l'l project inwardly at the inner side of the cover plate into bores 18 in the outer end of the abutment and on which the abutment is slidable. Coil springs I9 are positioned in the bores it behind the pins to project the inner rounded end of the abutment in the .2 chamber 6 to block ofi throat it from throat [2.

A second abutment 26 is slidable in a pocket 2! at a substantially diametrically opposite side of chamber 5 from abutment l3 and the two abutments and pockets are of duplicate construction whereby the abutments are spring projected into the chamber 6 and at an acute rearwardly disposed angle with respect to the direction of rotation of an impeller 22 0 elliptical shape rotating in the chamber and of a size to have its major axis equal to th internal diameter of the chamber. The abutments bear aga nst substantially diametrically opposite sides of the impeller.

A drive shaft 23 is cast integrally at one flat side of the impeller and is journaled in a bushing 24 supported in a stuffing box 25 at one side of the housing while a stub shaft 26 is cast integrally at the other fiat side of the impeller and is journaled in a bushing 21 in a bearin recess 28 in cover plate 7.

A pair of passages 29 and 39 are formed in the impeller and each extend transversely with respect to the axis thereof and are inclined in crossed relation with respect to each other and have their adjacent ends positioned at opposite sides of the apex of the lobes ti and 32 0f the impeller so that a clearance is at all times provided between th circular wall of the chamber and the ends of the passages and while the lobes 3i and 32 are in close working contact with the wall of the chamber to block one passage from the other.

The opposite ends of the passages 29 and 36 are flared to provide relatively wide slot-like throats 33 extending substantially the entire width of the impeller for the unrestricted flow of liquid into and out of the passages from and to the chamber.

Th volume of fluid being pumped is always constant in the pump chamber while volumes between certain points within the chamber are always changing. As the impeller 22 moves clockwise, the apex of lobe 3! moves away from abutment is and towards abutment 2B and the opposite apex of lobe 32 moves away from abutment 2i! and towards abutment l3 causing the areas behind the lobes 3| and 32 to increas and pulling fluid into chamber 6 behind the lobes and forcing fluid in advance of the lobe 3| from the chamber through passage 29 and out of outlet post H, as shown by the arrows in Figure 2, and also forcing the fluid in advance of lobe 32 directly out of outlet port I I.

The abutments i3 and 29 separate chamber 6 into an inlet chamber 3 5 having direct communi- 3 cation with inlet port 9 and an exhaust or outlet chamber 35 having direct communication with outlet port H, as shown by dotted lines in Figur 2, and passages 29 and 30 connect the inlet and outlet chambers to each other at all stages of the rotation of the impeller.

The shape of the impeller and the crossed arrangement of the passages 29 and 30 cause the pump chamber 6 to be twice filled and emptied with each complete revolution of the impeller.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be une necessary. However, since numerous modifica tions and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed as new is as follows:

A pump comprising a housing providin a circular pump chamber and provided with inlet and outlet ports adjacent each other, an elliptical impeller fitted in and rotatable in said pump chamber and having diametrically opposite end lobes in the major axis of the impeller, a pair oi spring biased abutments slidable in said housing to project nto said pump chamber at diametrically opposite sides of the chamber and slidably engage said impeller, one of said abutments being located between said adjacent ports, said lobes and abutments in one direction of rotation of the impeller dividing the pump chamber into a pair of diametrically opposite fluid intake and a pair of diametrically opposite fluid discharge chambers communicating with said inlet and outlet ports respectively, said lobes in said direction of rotation of the impeller creating intake in the intake chamber behind said lobes and pressure in the discharge chamber in front of said lobes to fill said intake chamber and empty said discharge chamber through said inlet andontlet ports, respectively, and a pair of through passages in said impeller at opposite sides thereof crossed relatively to each other open at the ends thereof onto said lobes at diametrically opposite sides of the major axis of the impeller to cross connect said intake chambers behind said lobes and to cross connect said discharge chambers in front of said lobes, whereby said pump chamber is filled and emptied twice during each rotation of said impeller.

References Cited in the file of this patent STATES PATENTS Number Name Date 1,348,103. George July 27, 19 0 2,232,951 Kosian Feb. 25, 1941 2,609,754 Prendergast et a1. Sept. 9, 1952 2,648,952 Dasher Aug. 18, 1953 FQBE N PATE um r Cou ry Da 305,17 Germa -.---T--.-.---- 6, 1

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