US1698235A - Rotary pump - Google Patents

Description

Jan. 8, 1929. 1,698,235

A. MATHls- ROTARY PUMP File-d Dec. 20, 1924 2 Sheets-Sheet 2 H64 v 555 Fla 6 7 'Y v f @Em/waffe MTH/s INVENTOR ATTO EY Patented Jan. 8, 1929.

UNITED 'STATES PATENT OFFICE.

ALEXANDER MATHIS, OF NEW ORLEANS, LOUISIANApASSIGNOR TO MATHIS R-S PUMP COMPANY, OF DENVER, COLORADO, A CORPORATJON OFYCOL-ORADO.

Romani; PUMP.

Application filed December 2o, 1924; serial no'. 757,182.

The present invention relates to rotary pumps of single or multiple reciprocating piston, or vane, types; said vanes alternately obtruding and receding during each cycle of 5 the rotor. n

Objects of the invention are to provide a mechanism of simple construction specially adapted to low rotor speeds and capable of' producing a high vacuum, which may be operated by Amanual or mechanical means and which has the elements thereof so organized that the largest power turn is produced with each revolution of the rotor; to provide a casing of special and novel construction and have rotatably mounted therein a rotor, also of special and novel construction; to set in or flatten the peripher of a segmental section of this casing and hring it into substantial contact with "the periphery of the rotor,

abruptly creating and terminating the power chamber and effectively separating the suction from the compression chambers; to provide easy egress of the pistons on the suction stroke and a knife edge scrap-er at the' inner end of the discharge port or chamber, which will effectively deflect all the fluids and any incidental foreign solid matter towards the discharge opening; to' so position the ports in the casing as to facilitate a suction intake with the least possible friction losses due to the ingress of the finids, and to augment the facility of discharge of not only the fluids but also and automatically, of all incidental solid foreign matter; to provide pistons of special and novel construction which, while acting in conjunction with elements hereinafter set forth, reduce frictional resistance to a minimum, yet form an air seal of superior efficiency with .the inner periphery of the rotor and the casing on all sides and prevent adherence f yforeign particles to the casing; to provide a special and suitably design-ed cam, or cams,

for automatically, and with the greatest p0s.

sible abruptness, terminating the power cycle of the vanes and relieving the important sections of the mechanism from all avoidable wear; to provide a pump which operates with facility and is characterized byA a minimum number of simply constructed parts which are capable of withstanding the strain necessarily imposed thereon.

Other objects of the invention will be apparent from the following description of t e present preferred form ofthe invention taken in connection with the accompanyingl drawings wherein Fig. 1 is a vertical sectional view of a typical pump'constructed in accordance with this invention, showing the case, rotor and vanes, the section being taken through the ports of 00 the casing but outside of the rotor and vanes;

Fig. 2 is a sectional view of the invention taken approximately along the vertical center line 2-2 of Fig. 1;

Fig. 3 is a horizontal sectionalview of the 65 pump showing a portion of the rotor broken away to disclose details;

Fig. 4: is an inside elevation view of one of the casing heads showing the cam formed therein; l

Fig. 5 is a vertical sectional view taken on the line 5 5 of Fig. 4f; l

.Figr is a vertical sectional view of a modified form of casing head showing the cam formed yseparatel from the head per se;

Fig. 7` is an end elevational view of the rotor; A

Fig. 8 is an elevational view :of the rotor looking at the periphery and showing a part thereof broken away to disclose details; v 3 Fig. 9 is van end elevational view of one of the vanes; and

Fig. 10 is a perspective view of the same. j The ldevice of this invention consists of a hollow casing 11, of partly circular conguration equipped with an intake port 12, and an exhaust port 13, located at the respective ends of the power chamber. The heads or X ends 14 of this casing may be made solid therewith or detachable and bolted thereto as at W 15. Both sides or heads are formed to have bearings 16 and 17 concentric with the cyliny' drical part ofthe casing 11, and in axial r .F ment with each other. The casin is s a or flattenedon the 'side of the inta'e anc dis- 95 charge ports, as indicated. at 18, and its inner at 21 thereby providing a breast 22 which conintimate contact therewith.

forms to the shape of the rotor 19 and is in This construction will effectively prevent the compression 'at 13 from reducing the suction at 12, thereby increasing the elliciency of performance; At 21 the breast is abruptly terminated in a sharp Wedge preferably slightly diagonal, which, in effect, provides a voluteknife edge scraper in continuous sliding engagement with the eriphery of the rotor, thus, not only deilectmg towards the discharge port all the pumpage but also effectively removing from the surface of the rotor all incidental particles of foreign matter. Furthermore, lodgement of p articles between the breast 22 and rotor 19 is prevented.

The general configuration of the casing between point and mner periphery 23 of the v casing may be either as shown in Fig. 1 or an suitable combmation of lines, arcs or both, ca

culated'to more or less abruptly bring the periphery 23 of the casing.

vanes into full normal engagement with inner The rotor 19, illustrated in Figs. 7 and'8, 'is made relatively smaller in diameter than the inside diameter of the casing 11, the difference in thesediameters being controlled by considerationsmfdesign of the mechanism as awhole. The 'side faces-.24 of the rotor are made to maintain a close sliding contact with the .inside surfaces of the heads 14V of the casing; To further augment theair sealing features of the rotor `an annular flange 25 is provided o-n each side of the rotor which `rform the closest possible sliding lit on any or all sides within thegrooved recesses 26 of l' .basing heads 14.

i 'i Portions 0f the rotor are removed to provide spaces 27' andthereby reduce the weight of the rotoix 'A shaft 8 is rotatably mounted in the bearings 16 .a Ad 17 ofthe 4casing and may have either one or both of'itsterminal's extended to permit .the application ofpower thereto. Vane receiving slots-29 are formed in the rotor andare so arranged. that the longitudinal axes thereof,` when vertically ar- 29, at theirouter ends may openfthrough the ranged asshown'in Fig. l`` will be parallel to a vertical line drawn'through the axis of the rotor. These slots 29 are placed in communication through openings 32 'which extend through the center of t-he rotor. The slots side of both rings 25, or may leavel these rings intact as shown in Fig. 8. .f v `Each of' he slots 29 has va vane or piston l 33, as shown in Fig. 9,- fitted and reciprocably mounted therein, said vanes being oblong in shape and equipped'with outstanding wings 35 ontheir advancing faces, the outer ter minals 36 conforming to the arc on the inner periphery 23 of the casing 11. The inner terminals of the vanes are/.equi ped with pins 37 which are movable into t 1e openings 32 when the vanes are retracted in their slots.

mounted thereon.- The vanes are normally held apart by helical springs 41 which encircle the pins 37 and impinge against the inner ends of the vanes to urge the outer ends of the latter against the yinner periphery 23 of casing 11. The springs 41 extend through 'the openings 32 as shown in Fig. 2.

To abruptly terminate compression strokes of the vanes 33, as illustrated by dotted line 42 in Fig. l, the .rollers 40 "are mounted to ride on a cam 43. This cam in its entirety, (see Fig. 4) may be formed Within theA casing heads 14 as illustrated by Fig. 5. If desired, however, the cam and casing head may be made -in two sepa-rate arts, 44 and 45 respectively, as illustratedl y Fig. 6. The inner terminal points 46 of actuating cams 43 are so located as to vnot only withdraw the vanes along the dotted line 42 of Fig. 1 but also to withdraw the outer terminals of the vanes 36, so as to effectively prevent them from impinging on the knife edge 21 of the `casi/ng and destroy its maximum effectiveness, as set any4 undue Wear on this very important section of the casin 4and inevitabll reducing the curvature of tie terminal en s 36 of the vanes which would bring about a reduction in their performance, eliiciency and wearing qualities; y

The cam surface over the remaining portionof its magnitude 48 is so shaped as to lpermit unhindered egress of the vanes freni within` the rotor on the suction stroke side vand to leave the outer terminals 3d of the vanes in full, unrestrained contact with the casing periphery 23, against Vwhich it is VJgently pressed by the springs 41 until the full power turn is completed.

In Fig. 1 the arrow to the u per. right hand indicates the direction of t e power turn.

. The lower of the vanes 33 is shown ready to be released from the restraint of the cam surface 47 and ready to goy into position shdwn by the dotted lines 49. In this position the space from the vane towards the port 12 will 4constitute the suction, or vacuum side,- the arcuate distance of travel from dotted lines 49 to dotted lines 50 constituting an approximate power turn. When the vane reaches the point indicated byl the dotted lines 50 it is withdrawn into t e rotor by reason of the configuration of the cam upon which the rollers 40 of the vane ride. Point 51 of Fig. 4, representing the beginning of the cam actua-ting surface, is so positioned. as to cause the vanes to begin to withdraw from contact with casing periphery 23 only after the opposite vane, emerging from the rotor on the suction side, has come into engagement with periphery 23, as illustrated bythe relative positions of 49 and 50 of Fig. l.

The position indicated by the dotted lines 52 of Fig. l represents the vane 50 completely withdrawn and ready to pass the breast lor seal 22, the space between the dotted arc of its terminus 36 and the breast 22 illustrating the safeguard essential to the proper protection of t-he surface 22 against undue wear. This latter is very important as the entire efhciency of the mechanism largely depends on/the maintained closeness of the sliding l contact between the rotor and this arc 22.

It is apparent that various changes may be made in this device especially in its details of construction, proportlon and arrangement of parts, within the scope of the appended claims. The device may also function without the specific provisions of the rollers 40, and cams 43, 47 and 48 by merely shapingthe casing on the discharge side 13 approximately along the dotted line 42 and permitting the outer terminals 36 of the vanes to be actuated thereby on their receding strokes.

Therefore the specific formation of the casing and t 1e arrangement of the ports, es.

pecially with reference to that part of the casing between the ports making a concentric arc contact with the rotor, and the position of the discharge port with its specific provisions, alone are deemed of importance to produce effective results.` Taken in conjunction 'with rotor, vanes and actuating cams as herein set forth, the eciency of the performance and capacity to resist wear, become very vmaterially enhanced. These features are therefore considered of para-mount importance to the production of aneicient, economical and thoroughly dependable device of this kind.

It is also to be understood that although this device is herein described as a rotary pump, it may likewise capaoitate as an engine by the induction thereinto of Huids under pressure.

-`What is claimed is :-4

l. A rotary pump consisting ofa casing, a breast mounted in the casing, a rotor mounted within the casing in intimate contact with the breast` said casing being provided on one side of said breast with a suction port and on the other side thereof with a discharge port,

radially opposed vanes slidably mounted within the rotor and equipped with cam rollers, an inwardly inclined cam formed in each end ofl the casing the terminals of which are so proportioned along the arc of travel of the aforesaid cam rollers that the outer ends of the advancing vane will not break contact with the inner periphery of the Casing on the discharge side of the stroke before the following vane has been restored-to contact with the casing periphery and closed the suction port. l v

2. A. rotary pump consisting of a casing, a rotor equipped with slidably fitted vanes and cradling breast formed within the casing and in intimate contact with the periphery of the rotor, the terminal edge of said breast on the advancing side of the rotor periphery being terminated abruptly and formed diagonally with reference to the longitudinal axis of the rotor, to provide a volute edge scraper in contact with the advancing periphery of said rotor. vf

3. A rotary pump including a casing with a breast formed therein, a cam formed in each end of the casing, a rotor revolubl mounted in the casing in contact'with said breast and provided with vane slots, vanes slidably mounted in said slots and equipped with cam engaging rollers, springs urging the vanes from within the rotor on the release side of the cam and along the outer terminals of the vanes against the casing during the power stroke, said springs providing a cushion at the inner limit of the sliding travel of the vanes for absorbing the momentum occa@ sioned by the withdrawal of the vanesthrough the action of the cam on the cam rollers.

4. A rotary pump including a casing p-rovided with inlet and outlet ports, a rotor revolubly mounted in said casing and equipped with vanes having outstanding wings formed thereon for impingement against the casing, said rotor having slots formed therein which complement and slidably receive said vanes.

5. A rotaryv pump including a casing having a cam formed in each end thereof, a breast formed in the casing, the latter being provide-d with inletand outlet ports, a rotor revolubly mounted in said casing in contact with said breast, and provided with vane slots,

vanes mounted in said slots and equipped with rollers which impinge said cams for retracting the vanes into the rotor while passing over the casing breast, and springs interposed between the inner end of each vane and the bottom of its slot to urge the vane outwardly after the latter passes over the breast.

ti. A rotary pump including a casing equipped with a breast provided with an in- `let port on one side of the breast and an outlet port on the opposite side of the breast, a rotor revolubly mounted/in the casing in 'contact with the breast, means to withdraw the vanes into the rotor wlien passing over the breast, and inde endent means t-o urge the posite side to define acam, a rotor revolubly vanes outwardly aflger the latter have passed mounted :in `the casing and equipped with 10 over the breast. rollers projecting into the casing recesses, 7. A rotary pump including a casing proand springs urglng the vanes outwardly to 5 vided with inlet and outlet ports, the inner yeldingly maintain the'rollers engaged with lface of each end of the casing having a re- 4the walls ofthe recesses.- cess formed therein, the Wall f which is ar- In testimony whereof I aix my signature. cuate on one side and deformed on the op- ALEXANDER MATHIS.

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