US1739139A - Pump - Google Patents

Description

l Dec. 10, 1929. H'H HAIGHT 1,739,139

PUMP

Filed May 18 1925 lag Fiji.

Patented Dec; 1o, 1929 A HIRAM H. HAIGHT, 0F MILWAUKEE, WISQONSIN PUMP Application med may is, 1925. serial No. 30,952.

. pumped and adapted to be self-cleansing,

whereby to prevent accumulations of foreign matter in the bearings.

It is a further object of the invention to provide a pump which is adapted to act upon electrolytes without being subject to electrolytic decomposition which might affect the material of which the pump is-constructed. This last feature is of great importance for the reason that ordinary sea water and many other less common substances have the propertyof establishing an electrical current between differing metals in a pump, whereby such metals are eaten away or caused to unite with other substances. action is comparatively weak in the.cas'e of sea water and yet the life of a pump used for sea water may be materially shortened by such action. It is one of the objects of the present invention as aforesaid to do away with electrolytic action, this being preferably accomplished by the use of a suitable nonmetallic bearing material which is preferably also free from attack by acids, and which therefore is 'peculiarly adapted for use in bearings which are lubricated by the elec.- trolyte or other material which is. being pumped. n In the drawings:l e

Figure 1 shows'a view largel p axial section through a pump em invention.

Figure 2 is a view taken on line 2 2 of Figure 1.

Figure 3 is aview similar to Figure 2, showingon a. slightly enlarged scale a modiication of the invention.

Figure 4 is a detail view in perspective, showing a further modification of certain of, the parts of the pump. a

Like parts are identified by the same reference characters throughout the several views.

The pump casing includes a body portion lO and a cover portion 11 which is adapted to be clamped to the body portion about the inin .vertical odying this The electrolytic terposed gasket 12. The pump mounted within the-above` described casing will preferably be of the type which includes a rin or lantern gear and a pinion, either of which,

for thepurposes of the may be primarily driven which will run idle.

In the Figure .present invention, and the other of 1 'construction the driving shaft 15 has the lantern or ring gear 16keye to its end whereby to therefrom. The pinion side of the pump casing be primarily driven 17 meshes upon one with the ring gear 16 andis driven therefrom about the axis of a stub shaft 18 which is slightly'eccentrie with reference to the axis of the driving shaft 15.

A crescent-shaped baffle tween the pinion l7and of the casing where not in mesh. The and gear results in 19 is interposed begear 16 at that side the pinion and gear are mesh between the pinion a displacement of the fluid acted on by the pump so that such uid is drawn into the pump casing through the intake manifold 20 and is expelled from the casing through the outlet manifold 21. The

action of known no necessary.

pumps of this character bein further explanation is deemed well to be It has heretofore been thought desirable use bushings or bearing sleeves of some comparatively soft metal between the several rotatable parts of the vpump and the adjacent stationary parts of the pump'case. For example, the pump casing and movable parts of the pump have frequently been constructed of some such metal as iron or steel and bearing sleeves of bronze or brass have been interposed between the moving and stationary parts of the pump. Salt various other substances of acting upon certain metals in of other metals to set up a flow current betwen such metals.

will act as an electrolyte in brass and iron or steel.

water, however, andhave the property the presence of electrical. Thus, salt water the presence of A similar action oc-4 curs when salt water is in the presence of brass and some other as Babbitt or the like.

In order to overcome tion. I have resorted to metal for all metallic still softer metal, Such this electrolytic acthe use of a single parts of the pump! `throughout the metallic parts A v bushing 25 is in Comunication throu 35, 36, and 37 withthe inlet manifo d 20 of the-pum "jidwthrough' the ss from the outside of the pumptowardwthe which are exposed tothe action of the electrolyte which is being acted upon by the pump, together with a non-metallic bearing liner which may be mounted either upon the rotary part or upon the 'adjacent stationary part, or may be allowed to float between said parts disconnected from both. It is broadly immaterial what particular `metal is used of the pump which are exposed to the electrolyte. The metals, above mentioned, are'most commonly used in pumps, but it will be obvious that the choice of a particular metal will depend to a large degree upon 'the resistance oii'ered by such metal to the purely chemical action ot' Athe material handled by the pump, While physical strength must also be given consideration. Amongthe various nonmetallic materials, such as fiber or the-like, which mghtbe used in carrying out this invention, I have found that molded rubber is best suited for my purpose,since rubber provides an excellent bearing for metallic rotors such asthe shafts and 18 and the gears-16 and 17.

Accordingly, I place within the bearing sleeve portlon 24 of the pump case body 10 a rubber bushing 25 which may have a flanged head 26, if desired. The rubber not only acts as an insulating medium to keep shaft 1 5 out of contact with casing portion 10 but also serves as an excellent bearing material to permit the rotation with very little friction of the metallic shaft 15 therewithin. The? flange 26 serves conveniently as an end thrust bearing member for the purpose of positioning the gear 16 properlywithin the casing. The end of sleeveportion 24 of the casing v is preferably counter-bored and threaded to.

comprise a packing gland in which a rubber rin 27 may be seated to receive the pressure of t e packing 28 forced thereagainst by the packing nut 29.

In order to providev for the self lubrication of thel bearing of shaft 15vwithin the rubber sleeve or bushin 25, I provide in the said sleeve and imme iately a jacent the packing gland just referre'dto an aperture or Iseries of apertures 30. Pipes 31 and 32 afford communication between apertures andthe outlet manifold 21 of t e pump casing. The chamber 34within the pump casing immediately surrounding the end of the rubber h'pipes Thus, the outside end of the bearing 1s su ject to such high pressures as exist at the. ump outlet and which are communicate to the bearing through wherea'sthe inside en d of the bearing is m communication through chamber 34 with such reduced pressures as exist at the pump'nlet. Thereby there tends to beproduced a flow of bearingA and preferably -of this arrangement the bearin openings 3 0,

inside thereof. Such a flow of` liquid acted upon by the pum not only lubricates the bearing between ru ber bushing 25 and shaft 15 but also performs the additional function of washing the bearing, This is particularly important when the pumpis handling such.

materials as paper stockfand the like, in which the pulp has a tendency in the ordinary'pump to work into the bearings and to escape through the bearings to the exterior of the pump. In such an event, however, it may be preferable to connect the pipe 40 to some independent source of liquid under pressure inorder that clean lubricant may always be available for bearing flushing purposes. In the presentdevice the outside portion ,of the bearing is subject to as high pressuresas exist within the pump or the system of which the pump is a part, whereas there is a low pressure zone established in chamber 34 at the inside end of the bearing. Consequently, there will be no tendency for foreign matter carried in suspension b y the fluid acted upon by the pump to work into the bearing,

shaft 18 opens to the end of the shaft against a disk 42 which directs into the bearing hereinafter to be described the liquid which issues under pressure from the duct 41. The

bearing between the rotor or pinion 17 and the relativel stationary shaft 18 is provided blyl means o a rubber bushing or sleeve 45 whic may be fixed either to the stationary or the 4movable parts adjacent thereto or may be floated between such parts. A low ressure chamber 46 is formed, if desired, in t e cover portion 11 of the pump casing and may communicate through return duct 47 and pipes 48 and 49. with the pi e 37 which leads to the intake manifold 20 o the pump. As a result upon which the' pinion 17 is rotatable is a so lubricated and cleansed just as Ais the bearing in which shaft 15 turns.

In addition to the use of rubber for bearing purposes at the points above indicated I may also line the pump casing with rubber at 50. Such a lnin furnishes a smooth non-metallic bearlng sur ace between the glear 16 and the body of the casing. Due to t e vfact that the liner 50 is atall times subject to the action of the liquid being pumped no special' passages for its lubricatlon are necessary.

In the Figure 3 construction I have illustrated a pump similar to that disclosed in my cogending application, Serial No. 14,636,

March 11, 1925,in which a tangential izo inlet ymanifold 52 and a tangential outlet mani-fold 53 are provided. In this device the drive shaft 15', instead of being connected wlth the ring gear 16, is keyed to the pinion 17 The ring gear 16 is driven by the pinion Y and finds a bearing within the pump casing.

Vvention, the ring gear rotor 16 stub shaft 18 and the bearing thereupon.

Shaft 15, however, will preferably be provided`with a bearing formed exactly in accordance with the disclosure in Figure 1. It is, of course, immaterial to this invention whether the pinion or the gear is primarily driven, and the disclosure of Figure 3 is introduced for the purpose of showing that it is also immaterial whether the bearing surface of rubber is formed upon the rotor as in Figure 3 or upon the stationary parts adjacent thereto, as is the case in Figure 2, Where the liner 50 is represented as being a part of the pump casing. In either event the rubber or other non-metallic material takes the Wear and co-operates with the metal to provide an excellent bearing surface without requiring the use of diiferent metals for that purose.

p In Figure 4 I have illustrated a construction in which the entire rotor is molded from rubber. The rotor 60 is intended to repre- Y sent a rubber roten-and it will be obvious that under such circumstances no special liner or facing 55 is necessary. In order to provide adequately for the wiping of the interior of the pump casing I prefer to breakV up the continuity of the' rubber surfaces by staggering the inlet and outlet ducts 56 and 57 in the manner clearly shown. Certain of these ducts may comprise slots disposed centrally witlrreference to the side. faces of the 'rubber rotor 60. Others o f these ducts may comprise notches of greater or less axial extent, as indicated. As a result of this staggered arrangement of the'ducts. it will be obvious that at short intervals 'about the 'pe' riphery of the rotor there will always b e a sharp edge adapted to wipe the interiorV surface of the. pump casing, whereby to keep such surface free of foreign matter.

It must be obvious from the foregoing thatl the objects of the present invention are wholly satisfied by the structure disclosed, and that I have provided not only a self cleaning and self lubricating bearing but also a construction such that regardless of the material which is acted lon by the pump there will be no electrolytic action occurring between the material of the pump proper and the material of which the bearings are made.' This latter rial acted upon by the pump', of dielectric bearing material disposed between said parts all metallic parts of said pump which are exposed to thel material acted on thereby being of the same metal to prevent electro- .lytic action in said pump.

2. In a pump, the combinationwith a caslng, a shaft mounted therein` und a rotary pump member mounted on said sha1' t within' said casing, of a rubber di-electric bushing forming a bearing for said shaft, all metallic `parts of said pump which are exposed to the material being pumped, being of the same metal to prevent electrolytic action in said pump. l 3. The combination with a pump casing. pumping mechanism therein including a gear element and a pinion'element, and a shaft operatively connected lwith one of said elements for driving the same, of a non-metallic di-electric bushing interposed between said shaft and a portion of said casing. all parts of said casing, said elements aud said shaft which are exposed to the material pumped. being made of the same metal to prevent electrolytic action in the pump.

4. In a pump, the combination with a pump casing, pumping mechanism therein ineludlng a ring gear element. and a pinion ele- .ment, and a shaft operatively connected to Y for said ring gear element adapted to pro vide a like bearing for said elements iny said cusing; all metallic parts of said pump which are exposed to the material pumped being made of the same metal to prevent electrolytic action in said pump.

5. In a pump, the combination with a pump casing having inlet and outlet ports, and la fluid displacing device.v of a rotor interposed between said device and said ports Within said casing and provided with apertures for liquid displaced. said apertures being variously Vpositioned and so distributed in the periphery of said rotor between the sides thereof that substantially all portions of the interior pcriphery of'said' casing will be traversed by such an aperture during rotation of said rotor.

6. The combination with a ported casing, of a rotor-having bearing contact with the interior thereof and provided with apertures so distributed across its bearing surface that the margins thereof will wipe substantially the entire inner periphery bearing surface of the casing.

7. The combination with a casing having an interior bearing surface and a port opening therethrough, of a rotor having a bearing in said surface and provided with offset apertures extending respectively substantially to one side or the other of said rotor and adapted successively to register with said port and rovided with margins ada ted to traverse su stantially all of said sur ace, whereby to cleanse said surface of solids and to be cleared by iuid traversing said ort,

8. The combination withl a casing aving an interior bearing surface 4 anda port opening therethrough, of a rotor provided with a complementary bearing surface anda ertures through said complementary sur ace sol distributed as to traverse substantially all of said casing bearing surface and to register successively with said port, and means for circulating fluid through said port and apertures registering therewith.

9. The combination with a casing having an interior bearing surface and a ort opening therethrough, of a rotor provid complementary bearing surface and apertures through said complementary surface so distributed as to traverse substantially all of said casing bearing surface and to register successively with said port, and means for circulating fluid through said port and apertures registering therewith, said means comprising a displacement devicel within said rotor.

10. The combination with a casing having aninterior bearing surface and a port opening therethrough, of a rotor provided-with a complementary bearing'sur'face and a ertures through said complementary sur ace so distributed as to traverse substantially all of said casi-ng bearing surface and to regislter successively with said ort, and means for circulating uid throug said port and apertures registering therewith, said rotor 1 being internall toothed and provided with at least one o said apertures for each interdental space, and said means comprising a pinion eccentricall mounted within said rotor in mesh with t e teeth at one side there-l 11. :Thelcombination with a ported casing having an interior bearing surface, of an intei-nal pump gear bearing in said surface vand provided withapertures opening toward said surface from its interdental spaces in offset positions, some of which open to one side or the. other of said gear, whereby to traverse substantialy all of said surface.

12. The combination with a ported casing ed with a said apertures being successively oii'set whereby the unapertured portion of said gear .is substantially helical in form.

HIRAM H. HAIGHT.

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