US2462214A

US2462214A - Rotary pump with easily removable rotor

Info

Publication number: US2462214A
Application number: US598059A
Authority: US
Inventors: Carl A Namur
Original assignee: SPECIALTY BRASS Co Inc
Current assignee: SPECIALTY BRASS Co Inc; SPECIALTY BRASS COMPANY Inc
Priority date: 1945-06-07
Filing date: 1945-06-07
Publication date: 1949-02-22
Anticipated expiration: 1966-02-22

Description

C. A. NAMUR ROTARY PUMP WITH EASILY REMOVABLE ROTOR o 4 9 1 9m. 2 .hm e F 5 Sheets-sheet 1 WN NNINNl MNA r IV E m ma s. w Q.

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ROTARY PUMP WITH EASILY REMOVABLE ROTOR Filed June 7, 1945 5 Sheets-Sheet 3j Zzwezzzor/ C'ary fmur Feb. 22, -1949. C, A, NAMUR 2,462,214

ROTARY PUMP WITH EASILY REMOVABLE ROTOR Filed June '7, 1945 5 Sheets-Sheet 4 ven 22072 cfrzmw;

Feb. 22, 1949. c. A. NAMUR 2,462,214

ROTARY PUMP WITH EASILY REMOVABLE ROTOR Filed June '7, 1945 5 Sheets-Sheet 5 I l l l I 'L Patented rennais-19 ,l l 2,452,214 UNITED STATES param omas cialty Brass Company, Incorporated, Kenosha,

Wis., a corporation oi Wisco substituted for abandoned application Serial No.

373,358, January 6, 1941. This 7, 1945, Serlal N0. 598,059

application June Claims. (Cl. 1413-205) end to provide the annular bracket I5 into which the casing B is fitted.

The casing B comprises the inboard head I8 and the outboard-head I1. The inboard head I8 An object of the invention is to provide a pump of the rotary type in which the parts are in accurate relation and alignment and which at the 'same time permits of easy and convenient dismantling and reassembly for cleaning. Another object is to provide a pump which will accommodate substantial liquid pressures without leakage and without the additional wear usually associated with higher pressures. Another object is to provide a pump of the rotary type in which the cylindrical surface swept by the impelling means is not interrupted by inlet and outlet ports, thus to produce a more uniform flow of liquid throughout the pumping cycle and avoid irregular wear of the surfaces. provide in a pump of this character improved impeller mechanism employing a spacing member for keeping the impeller blades always in proper position with respect to the surface being swept. Still another object is to provide impeller mechanism employing resilient spacing means for the blades, thus to compensate for wear on the various parts. A further object is to provide a. rotary type pump which is more eilicient and which is sturdy and positive in its operation. Still other objects and advantages will appear after the following description in which one embodiment of the invention is described in detail.

In the accompanying drawings, Figure l is a longitudinal vertical sectional view of one form of the improved pump fully assembled; Fig. 2,

l.an elevational view showing the outboard end of the pump; Fig. 3, a view as in Fig. 2 but with the clamp, outboard head of the casing, and pulley removed; Fig. 4, a horizontal sectional view taken as indicated at line dof Fig. 3 and showing the outboard head in place; Fig. 5, a detail perspective view of the spacer element; and Fig. 6, a detail view showing the shaft nut and rotor retaining nut assembly at the end of the drive shaft, the view being taken as seen from line 6-6 of Fig. l.

As illustrated, A designates a frame; B, a casing structure providing the liquid enclosure; C, liquid impelling mechanism within the enclosure; and D, mechanism for driving the impelling mecha- Another object is to.

has a cylindrical wall portion I8 and a rear end portion- I8, the outer periphery being cut away at 20 to provide a seat against the bracket I5.

A pin 2| in bracket I5 ,engages a socket 22 in head I8 to hold the head in the correct angular position.

The outboard headl Il has near its outer edge a chamfer corner 23, and the'rim 24 of the inboard head portion I8 extends into this chamfer. The edge 25 of rim 24 is beveled so as toV provide an annular space for the gasket 28. The gasket 26 is triangular in cross section, and'increased pressure from within the casing tends only to press it more rmly into the converging walls retaining it, thus to provide a tighter seal between I the inboard and outboard heads.

A clamp 55 extends about the casing and has its ends hooked over the bracket I5. \At' the center of this clamp is a screw 56 which when turned down presses against the center of the outboard head l1, thus at the same time holding the casing within bracket I5 and holding the heads of the casing together insealed engagement.

A wear ring 21 is contained within the inboard head I6, and the interior cylindrical surface 28 of this ring is the surface swept by the impelling mechanism in the operation of the pump. Wear ring 21 has its inboard end abutting the end portion I9 of the inboard head and has its outboard end abutting the outboard head I1. Ring 21 is slightly longer than the interior of wall I8, so

- that as the outboard head I1 is pressed inwardly,

this ring is held tight and secure against rotation within the casing. At the same time, the resilient gasket 26 provides an adequate seal between the two heads.

As shown more clearly in Figs. 3 and 4, the casing structure B is provided with inlet and outlet ports. The interior of tube 30 communicates with the channel 3i in head portion I8 outward of wear ring 21. Channel 3| extends into the end-pass channel 32 about the inboard end of ring 21 and also into the channel 33 about the outboard end of ring 21. Thus, when tube 30 is used as a liquid inlet, the incoming liquid passes into channel 3i and simultaneously through channelsv32 and 33 into the interior of the Wear ring 21.

Similarly, the interior of tube 35 communicates msm c. with the channel as in the wan ns, and this chan- The frame A may be of any suitable construcnel connects with channels 31 and 38 extending tion and. as here shown, includes a base I0 and respectively around the inboard and outboard an outer shell I I into which is received the inner ends of the wear ring.

shell I2 which carries the ball bearings I3 and Tube 30 'may be the inlet and tube 35 the out- I4. The outer shell II is formed at its inboard let, or tube 35 may be the inlet and tube'30 the outlet, depending on 3 which' is rotated. Tne/impeuer mechanism c includes an annular rotorfelemcnt Il whiclris carried on the rotor direction the'impeller back plate 4I. Element 4l has a cylindrical outer 5 surface and contains a center cavity-ll having preferablya cylindrical surface 4l coaxial with the outer surface. Rotor 4I is mounted for rotation within wear ring 21 and is eccentric with respect to the axis of ring 21 so that at one po t its outer surface approaches the surface of e wear ring but near a diametrically opposite point these surfaces are a maximum distance apart.

A plurality of slots Il* extend radially through Moabit greater is the emciency of the seal for shutting oi! possible leakage from the casing.

In operation, the pump is driven by power ,applied at pulley Il. The shaft It in turn drives the rotor ll. and the space 80, between'the rotor and the wear ring, is caused to .move about the casing from inlet port to outlet port.v The blades also move along' with the rotor member and sweep the liquid in front of them. As the blades rotate, the spacer I moves along with them, and it also permits movement of the blades with respect to itself. The rounded inner edges of the rotor Il; in the embodiment shown, four such L slots are employed, but more or less may be used as desired. Rotorblades I2 extend through the slots 4I, their outer ends engaging the surface 28 of wear ring 21, and their inner ends extending into the hollow center of rotor 4I).

A spacer Il is disposed within cavity Il and its surface engages the inner ends of each of the blades 42 so as to maintain these blades in their proper positions, with the outer ends contacting the wear ring. This spacer is cylindrical and is unattached to any part. Its axis is preferably the same as the axis of the wear ring 21. It maybe a solid cylindrical piece or it may be tubular. However, it should preferably have a resilient surface, and in the embodiment shown it takes the form of a split ring, the ring being expansible so that as the surface of wear ring 21 or the ends of the blades l2 become worn, the spacer ring expands to yet maintain the blades in proper contact with the wear ring surface. If desired, the spacer may be provided with a reinforcing core member.

The driving mechanism D includes the hollow shaft Cil which is carried for rotation in the roller bearings I3 and Il. The driving end of this shaft extends through wall I9 of the casing B and is adapted to receive the hub 48 of lthe rotor Il. This hub preferably has a slight 'taper so that as it is drawn into the end of the shaft, a tight accurate ilt is effected. At one side, the hub 4l has a channel 41 which is traversed -by the pin il as the hub enters the shaft. Attached to the hub 4l is a rotor rod B2 which may be secured by having its end screwed into a tapped hole in the end of the hub. The rotor rod l2 extends through the hollow of shaft and has its extended end threaded and engaged by the rotor retaining nut B3 which bears against the end of the shaft. The hub 46 has a taper at the point where it meets the shaft which has a similar taper, these tapered surfaces helping to center the hub and rotor back plate l I.

A drive pulley S5 is mounted on shaft Il and secured to the shaft suitably by means of the key Il, and a pulley lock nut 81 is screwed on the end of the shaft. The nut 81 is provided with a ange B8, and the rotor retainingnut 83 is equipped with the ears 89 which extend about this flange. With nut 63 so engaged, it is held from movement axially of the shaft.

, An elcient liquid -seal is maintained between 6 the casing plate I9 and the rotating elements so as to prevent leakage of liquid between intermoving surfaces. This sealing means includes the retaining ring 10, the resilient ring 1I, the ring bearing 12, and the resilient ring 13. The construction and operation of such sealing means is. described in detail in my copending application, Serial No. 226,999, filed August 26, 1938 now abandoned. It is sufficient to state here that the greater is the pressure of the liquid, the

blades help during such intermovement to maintain constant spacing so that the outer ends of the blades are at all times in the proper contact with the wear ring. When a resilient spacer is used, any Wearpn'either the ends of the blades or on the wear ring or on spacer surfaces is compensated by expansion of the spacer.

When, for example, the rotor is driven clockwise, as seen in Figure 3, the liquid enters the pump through tube 20, passes ilrst into the channel II, then simultaneously through channels I2 and 23 into the space SII within the wear ring 21. Upon completion of the stroke, the liquid within the wear ring is forced out simultaneously through channels 31 and IB into the channel 30 from which it passes out through tube 35. When the rotor is driven in the other direction, the flow is in the opposite direction through the same channels.

By having the entering and leaving liquid pass around the blade-contacting surface instead of through it as in the usual construction, a sub` u stantlal advantage is gained. In ordinary conu this break in the surface causes unequal wear,

producing pockets in the wearing surface. With the present construction, the blades at all timesy contact only a uniform unbroken surface, and the inlet and outlet ports are at practically their full opening during the entire pumping cycle.

By having the liquid proceed simultaneously about each end of the wear ring into the pump interior and then simultaneously about each end of the ring on its way out,the liquid pressure on each end of the rotor is substantially the same, and in this way the improved construction eliminates end thrust on' the rotor due to liquid pressure.

The improved pump is particularly useful in connection with milk, other liquid foods, and in any application where sanitation is of importance, since this pump is very easily dismantled for cleaning.

To take the pump apart, it is necessary only to loosen and remove the clamp 55 by turning the screw 5B (this loosens the outboard head), and then turn the rotor retaining nut 63 to push the rotor hub 4S from its engagement with the shaft 60. This frees the rotor and also the inboard head and sealing rings. Thus, with twovery simple movements, substantially all the essential parts of the pump are loosened and made availlable for cleaning and inspection or replacement of parts.

Since the engagement of ears 69 on retaining nut 63 prevents movement of this nut axially of the shaft, rotation of this nut can serve only to push the rotor rod 62 endwise, forcing the rotor hub 46 to move directly endwise out of engagement with the shaft 6U. Thus, a very closely fitting joint is provided which, with the means provided, can be very simply and easily disengaged.

The reassembly of the parts can be accomplished in reverse order to the dismantling procedure just described. However, it may be pointed out that in securing the rotor to the shaft it is not possible, in a preferred embodiment of the invention, to assemble the parts with the rotor hub in the wrong angular position. The rotor rod 62 is preferably just long enough to extend through the hollow shaft 60 and engage the rotor retaining nut 63 only after the channel 41 on the hub has come into register with the pin 6i of the shaft and the parts have moved axially partly into position. Then turning of the retaining nut 63 draws the hub positively into close iitting relation with the shaft,` thus insuring accurate movements of the parts and more eillcient operation.

The fact that the wear ring 21 is held positively between the heads of the pump is also an advantage, since this engagement prevents rotation of the wear ring and at the same time the heads are held positively at the same uniform spacing.

This enables the rotor to be closely tted with a minimum of space between the outboard end of the rotor and the outboard head, and no allowance need be made, as in the ordinary constructions, for varying thickness of a gasket.

While in the foregoing description, I have set forth one structure in considerable detail for the purpose of showing an embodiment of the invention, it will be understood that the details of such structure may be varied widely by those skilled in the art without departing from the spirit of my invention.

I claim: 1. In a pump structure providing an impeller chamber, a pump impeller mounted in said chamber and equipped with a rear plate and a hub extending rearwardly from the plate, a hollow shaft for said impeller' mounted for rotation within said pump structure and receiving vthe hub of said impeller plate, means fixed to said shaft for rotating the same, said hollow shaft being provided at its rear end with an outwardlyextending retainer ange, a rod received within said hollow shaft and fixed to said impeller plate hub, said rod having an outer threaded end, a wheel provided with a groove receiving said flange of the hollow shaft and being provided centrally with a nut receiving the threaded end of said rod. and a closure for said chamber axially aligned with said rod.

2. In a pump structure, ahollow shaft rotatably mounted therein, said structure providing an impeller chamber open at its forward end, an impeller within said chamber and provided with an impeller plate having a hub slidably received within the end of said hollow shaft, a key carried by said shaft and engaging a slot extendingV along said hub and opening at the rear thereof, an impeller rod xed to the hub of said impeller plate andhaving a threaded end at its rear, a collar carried by said hub for spacing the same centrally within said hollow shaft, a wheel mounted at the rear end of said pump structure and provided centrally with a nut receiving the threaded end of said rod, interlocking means carried by said'wheel and pump structure for rotatably supporting said wheel upon said structure, and a removableclosure supported inthe forward end of said pump chamber to close the same.

3. In a pump structure providing an impeller chamber open at its forward end, an impeller Ain said chamber and provided at its rear with an impeller plate equipped with a rearwardlyextending hub, a hollow shaft rotatably mounted in said pump structure and having its forward end receiving said hub, key and groove means releasably locking said hub and shaft together, a rod fixed to said hub atA one end and having its other end threaded, a rotatable wheel equipped centrally with a nut receiving the threaded end of said rod, cooperating means carried by said wheel and pump structure for rotatably confining said wheel upon said structure, and releasable closure means closing the forward end of said chamber in axial alignment with said rod, said wheel when rotated in one direction advancing said rod axially to remove said closure and expose said impeller for cleaning.

4. Ina pump structure providing an impeller chamber open at its forward end, an impeller in said chamber and provided at its rear with an impeller plate equipped with a rearwardly-extending hub, a hollow shaft rotatably mounted in said pump structure and having its forward end receiving said hub, key and groove means releasably locking said hub and shaft together, a rod fixed to said hub at one end and having its other end threaded, a rotatable wheel equipped centrally with a nut receiving the threaded end of said rod, cooperating means carried by said wheel and pump structure for rotatably confining said wheel upon said structure, and releasable closure means closing the forward end of said chamber in axial alignment with said rod,

said wheel when rotated in one direction advancing said rod axially to remove said closure and expose said impeller for cleaning, and when rotated in the other direction being eifective for moving the impeller inwardly within said chamber.

5.. In a pump structure providing a chamber open at opposite ends, a hollow shaft rotatably mounted in said structure and extending through one end of said chamber, packing supported about said hollow shaft within said chamber, an

impeller mounted in said chamber and provided with an impeller plate closing the space in front of said packing, said plate being provided with a hub received within said hollow shaft, a rod fixed to said hub and extending through and beyond said hollow shaft, said rod being provided with a threaded portion at its rear, a member rotatably secured upon said structure and equipped centrally with a nut receiving the threaded end of said rod, and a closure member movable axially -in alignment with said rodand releasably secured upon said pump structure.

CARL A. NAMUR.

REFERENCES CITED The following references are of record in the f-eof this patent:

UNITED 'STATES PATENTS Date