US3622255A

US3622255A - Pump

Info

Publication number: US3622255A
Application number: US848225A
Authority: US
Inventors: Gavril T Lusztig
Original assignee: Individual
Current assignee: Individual
Priority date: 1969-08-07
Filing date: 1969-08-07
Publication date: 1971-11-23
Anticipated expiration: 1988-11-23

Abstract

Pump, comprising a casing, pumping teeth solid with a pumping wheel, sealing teeth solid with a sealing wheel, the pumping teeth and the sealing teeth moving in annular spaces which are separated along a portion of their length and do intersect along another portion of their length; part of that contour of the sealing teeth and that surface of the disc or ring of the pumping wheel which effect the sealing between the suction zone and the pressure zone being parts of two substantially spherical surfaces with common center and substantially equal radii; and the arrangement of the pumping wheel and sealing wheel being such that their respective axis do intersect in the center of the spherical surfaces described above.

Description

United States atent [72] Inventor Gavril T. Lusztig 21 Appl. No. 848,225 122 Filed Aug. 7, 1969 I45] Patented Nov. 23, 1971 [73] Assignee Gavrll T. Lusztig 80 Lupton Lane Apt. 1C, Haledon, NJ. 07508 [54] PUMP 10 Claims, 4 Drawing Figs.

[52] U.S.C1 418/195, 418/196 [51] 1nt.C1 F0lc1/08, FO4c 1/04, F04c 17/04 [50] Field ofSearch 418/195, 10,196; lO3/l25,l27, 1l7;230/l37,142, 150; 91/69, 85; 123/12C, 12 E [56] References Cited UNITED STATES PATENTS 1,284,768 11/1918 Powell 91/85 2,679,352 5/1954 Vance... 230/137 3,335,669 8/1967 Gerber 103/127 Primary li.\-aminerCarlton R. Croyle Assislan! Examiner-John J. Vrablik Atmrne v.1ames E. Niles ABSTRACT: Pump, comprising a casing, pumping teeth solid with a pumping wheel, sealing teeth solid with a sealing wheel, the pumping teeth and the sealing teeth moving in annular spaces which are separated along a portion of their length and do intersect along another portion of their length; part of that contour of the sealing teeth and that surface of the disc or ring of the pumping wheel which efiect the sealing between the suction zone and the pressure zone being parts of two substantially spherical surfaces with common center and substantially equal radii; and the arrangement of the pumping wheel and sealing wheel being such that their respective axis do intersect in the center of the spherical surfaces described above.

PATENTEUNUV 23 I911 3,622,255

' SHEET 2 OF 2 PUMP Various pumps are known in the prior art, which present the common feature of a casing containing cavities in which a number of two or more wheels with meshing teeth are disposed. One or more wheels work as pumping wheels, the teeth of these wheels will be called hereinafter pumping teeth; the remaining wheels work as sealing wheels, the teeth of these wheels will be called hereinafter sealing teeth.

The cavities in the casing are partially filled out by the discs or rings which carry the pumping teeth and the sealing teeth; and by the possibly present other parts which can be fixed or rotatable together with the wheels in such way that there remain empty annular spaces, in which the pumping teeth and the sealing teeth move during the rotation of the wheels. The annular space in which the pumping teeth move and those in which the sealing teeth move are completely separated along a portion of their length, and along another portion of their length they are intersecting, such that during the rotation of the wheels the pumping teeth enter in the annular space in which the sealing teeth move, then the pumping teeth move a distance being completely immersed in the space in which the sealing teeth move contained in the spaces between the sealing teeth, and then leave that space.

In the portion in which the pumping teeth enter in the spaces between the sealing teeth the fluid is expelled, this portion being called hereinafter pressure zone, and communicates to the pressure port; in the portion in which the pumping teeth leave the spaces they hold between the sealing teeth, the fluid is aspirated; this portion being called hereinafter suction zone, and communicates to the suction port.

The sealing of the suction zone from the pressure zone occurs in the direction of the rotation of the wheels by means of the pumping teeth and the sealing teeth, the contours of which are fitted with small clearance in respect to the corresponding surfaces of the casing. It is also essential for the sealing that the discs or rings of the pumping and sealing wheels are fitted with small clearance between their lateral surfaces and the corresponding surfaces of the casing. Contrary to the direction of the rotation, the sealing of the suction zone from the pressure zone occurs by means of the sealing teeth, the contours of which are fitted with small clearance in respect to the corresponding surfaces of the casing, and in respect to the corresponding surfaces of the disc or ring of the pumping wheel, or with a possibly present disc, which is rotating together with the pumping wheel and lateral with the casing.

In the prior art, the sealing between the sealing teeth and the surface of the disc or ring of the pumping wheel or of the possibly present disc which is rotating together with the pumping wheel, occurs along plane surface (s). That implies the disadvantage of limiting the choice of the arrangement of the wheels; and especially the compensation of the hydraulic pressure-load upon the wheels becomes impossible or unfeasible, and could be achieved only by introducing other disadvantages, especially the augmentation of the volumetric losses.

According to the present invention, that part of the contours of the sealing teeth, and that surface of the disc(s) or ring(s) of the pumping wheel(s), and sometimes also of the casing, which are fitted with small clearance to effect the sealing between the suction zone and the pressure zone are portions of two substantially spherical surfaces with common center of curvature and substantially equal radii, the radii differing only slightly for forming the necessary running clearance between the surfaces in relative motion. Also according to the present invention, the arrangement of the pumping wheel(s) and of the sealing wheel(s) is such that their respective axis do intersect in the center of curvature of the spherical surfaces described above.

One important feature of the present invention resides in the accomplishment of the sealing between the moving parts using surface-contacts (respective gaps) between them, thus avoiding the poor sealing efiects of the customary linear sealing-line design.

Another important feature resides in the possibility to compensate the hydraulic-pressure loads upon the wheels by using adequate arrangements.

These and other features of the invention will emerge clearly from the preferred embodiments described in connection with the drawings, in which:

FIG. 1 is a longitudinal cross-sectional view of the pump or motor.

FIG. 2 is a partial sectional view taken along a spherical surface through a suction zone and a pressure zone of the pump or motor shown in FIG. 1.

FIG. 3 is a longitudinal cross-sectional view of a similar sump or motor as shown in FIG. 1 having a relatively wide disc of the pumping wheel.

FIG. 4 is a longitudinal cross-sectional view of a pump or motor having two sets of pumping teeth.

Following is a description of the pump or motor shown in FIG. 1:

A casing, 1, contains cavities which are partially filled out by a disc, 2, a shaft, 3, a key, 4, and a ring, 5. In the remaining empty annular spaces are disposed the pumping teeth 6 solid with the disc 2 and the sealing teeth 7 solid with the ring 5.

Further cavities

8 and 9 are provided in the casing 1, which respectively connect the suction zones and the pressure zones to the corresponding ports. A pumping wheel consists of the disc 2 and the pumping teeth 6 solid with it. A sealing wheel consists of the ring 5 and the sealing teeth 7 solid with it. The axis 11 of the pumping wheel and the axis 12 of the sealing wheel are intersecting in a point which is at the same time the center of curvature of the spherical surface 13 of the disc 2 and of the spherical surface 14 of the contour of the sealing teeth 7. A key 10 is provided to connect the shaft 3 with a driving device not shown in the drawings. The arrows 15 and 16 are indicating the direction of the motion of the pumping teeth and the sealing teeth; the arrows l7, l8, l9 and 20 are indicating the flow of the pumped fluid. The shaft 3, the pumping wheel and the sealing wheel are rotatable in respect to the casing. The shaft 3 being driven, the pumping wheel is turning together with it and the pumping teeth 6 shown in the partial section represented in FIG. 2 move for instance in the direction indicated by the arrow 15. The meshing sealing teeth 7 are pushed by the pumping teeth 6 and move in the direction indicated by the arrow 16; this causes the rotation of the sealing wheel.

In the situation shown in FIG. 2, following the direction indicated by the arrows l5 and 16, the annular spaces in which the pumping teeth move and that in which the sealing teeth move are first separated, then they are intersecting and finally separated again. In the portion in which the pumping teeth 6 enter in the annular space in which the sealing teeth 7 move the fluid is expelled, this being indicated by the arrows l9 and 20. This portion being a pressure zone, it communicates to the pressure port (not shown in the drawings). In the portion in which the pumping teeth 6 leave the spaces they held between the sealing teeth 7, the fluid is aspirated, this being indicated by the arrows l7 and 18. This portion being a suction zone, it communicates to the suction port (not shown in the drawings).

The sealing of the suction zone from the pressure zone occurs in the direction of the movement indicated by the arrows l5 and 16 of the pumping teeth 6 and sealing teeth 7 by means of the pumping teeth 6 and the sealing teeth 7, the contours of which are fitted with small clearance in respect to the corresponding surfaces of the casing l. The sealing is completed by the fit with small clearance of the lateral surfaces of the disc 2 and ring 5 in respect to the corresponding surfaces of the casing l.

Contrary to the direction of the movement of the pumping teeth 6 and sealing teeth 7, the sealing of the suction zone from the pressure zone occurs by means of the sealing teeth 7, the tops of which have according to this invention spherical surfaces 14 which are fitted with small clearance in respect to the also spherical surface 13 of the disc 2 and the also spherical surface of the casing i, which forms small gaps with the spherical surface 14 of the tops of the sealing teeth 7. The sealing is completed by the fit with small clearance of the lateral surfaces of the sealing teeth 7 and the lateral surfaces of the disc 2 and ring in respect to the corresponding surfaces of the casing l.

The pump shown in FIG. 3 works basically on the same idea as that shown in the FIG. 11. The parts In to 14a shown in FIG. 3 are homologous to the parts 1 to 14 shown in FIG. 1. The disc in of the pump shown in FIG. 3 is, however, substantially wider than the disc 2 of the pump shown in FIG. 1. Because this difference in the case of the motor shown in FIG. 3 the sealing of the suction zone from the pressure zone occurs in the direction of the movement of the pumping teeth 6a and sealing teeth 7a by means of the pumping teeth 6a and the sealing teeth 7a, the contours of which are fitted with small clearance in respect to the corresponding surfaces of the casing in and in respect to the corresponding surface of the disc la. The sealing is completed by the fit with small clearance of the lateral surfaces of the disc in and ring 50 in respect to the corresponding surface of the casing in and by the fit with small clearance between the surface 13a of the disc Ia and the corresponding surface of the casing la.

Contrary to the direction of the movement of the pumping teeth 6a and sealing teeth 7a, the sealing of the suction zone from the pressure zone occurs by means by the sealing teeth 7a, the tops of which have according to this invention, spherical surfaces 14a which are fitted with small clearance in respect to the also spherical surface 13a of the disc 20. The scaling is completed by the fit with small clearance of the lateral surfaces of the sealing teeth 7a and the lateral surfaces of the ring 5a in respect to the corresponding surfaces of the casing Ia.

In both of the preferred embodiments described, the hydraulic pressure-loads upon the pumping wheel and the sealing wheel are compensated, because in both of the described embodiments there are two diametrically opposed pressure zones, and the pressure forces applied upon the wheels in the area of the one and the opposite zone are equal in value and have opposite directions, thus compensating one the other.

While the described embodiments present two particular cases of the width of the disc of the pumping wheel (6 and 6a it is understood that the width of that disc can have any other suitable value.

It is also understood that, while in the described embodiments the annular space in which the pumping teeth. move and the annular space in which the sealing teeth move do intersect in two diametrically opposite areas; by changing the relative position of the annular spaces, arrangements can be obtained in which said two annular spaces do intersect in two areas which are not diametrically opposed, or arrangements in which they intersect in one area only.

It is also understood that while in the described embodiments the pumping teeth are solid with a disc and the sealing teeth are solid with a ring, arrangements can be provided in which the pumping teeth are solid with a ring and the sealing teeth are solid with a disc.

It is also understood that while each of the described embodiments contains one set of pumping teeth and one set of sealing teeth, arrangements can be provided containing more than one set of pumping teeth and/or more than one set of sealing teeth In FIG. 4 is shown another embodiment which works basically on the same idea as that shown in FIG. 3. The parts lb to 14b, shown in FIG. 4 are homologous to the parts In to Me shown in FIG. 3. However, the pump shown in FIG. 4 comprises two sets of pumping teeth 6b] and 6b2 solid with the disc 21;, and the annular space in which the pumping teeth 6b! move does intersect the annular space in which the sealing teeth 7bmove in one area, and the annular space in which the pumping teeth 6b2 move does intersect the annular space in which the sealing teeth 7b move also in one area, diametrically opposed to the area in which the annular space in which the pumping teeth 61 move does intersect the annular space in which the sealing teeth 7b move.

It is also understood that the described arrangement can be 5 also used as fluid motor, flow meter, mixing device or in any other purpose suited by this invention.

I claim:

l. A rotary pump comprising a casing having a number of cavities connected by annular spaces having sidewalls, a disc mounted for rotary motion in one of said annular spaces in said casing and having a plurality of equally spaced radially outwardly extending teeth on its outer periphery positioned to sealingly engage said sidewalls and to move through said cavities, a ring mounted for rotary motion in the other of said spaces in said casing in a plane oblique to the plane of motion of said disc and having a plurality of equally spaced radially inwardly extending teeth on the inner periphery positioned in a transverse relation to the direction of motion of said ring to sealingly engage said sidewalls and to mesh with the teeth on said disc at the points of intersection of the plane of motion of said disc and ring, said teeth on said disc being smaller in width than the teeth on said ring, one of said teeth on said ring always being in sealing engagement with said sidewalls at the said points of intersection to seal the cavities on one side of said points of intersection from the cavities on the other side of said points of intersection whereby a pressure chamber is formed in the cavity at the point of engagement of said teeth and a suction chamber is formed at the point of disengagement of said teeth.

2. The pump according to claim 1 wherein the inner periphery of the teeth on said ring has a spherical contour, and the outer periphery of said disc between said teeth has a spherical contour corresponding to the contour on said teeth to form a seal on engagement.

3. The pump according to claim 1 wherein said sidewalls of the other of said spaces at the point of intersection with said one of said spaces has a length sufficient to bridge the gap between two of the teeth on said ring.

4. The pump according to claim 3 wherein said length is equal to the width of one gap and the thickness of one tooth.

5. A rotary pump comprising,

a casing having a first pair of sidewalls defining an annular space, a second pair of sidewalis defining a second annular space, intersecting said first annular space at an angle,

a disc mounted for rotary motion in said first annular space and having a plurality of radially outwardly directed pumping teeth on its outer periphery,

a ring mounted for rotary motion in said second annular space and having a plurality of radially inwardly directed sealing teeth on its inner periphery positioned in a transverse relation to the direction of motion of said ring to sealingly engage said sidewalls, said sealing teeth being larger in width than said pumping teeth and spaced for meshing engagement with said pumping teeth at the line of intersection of said annular spaces and being spaced apart a distance greater than the width of said pumping teeth,

and a cavity in said casing on each side of said line of intersection of said spaces,

one of said sealing teeth always sealingly engaging said sidewalls of said second annular space at the line of intersection of said annular spaces, whereby pressure chambers are formed on one side of the line of intersection of said spaces and suction chambers are formed on the other side of said line of intersection.

6. The pump according to claim 5 wherein said disc has a spherical contour between said pump teeth and said sealing teeth have a spherical contour corresponding to the contour of said disc to form a seal therebetween.

7. The pump according to claim 5 wherein the sealing surface of said sidewalls between said cavities bridges the gap between said sealing teeth.

8. The pump according to claim 5, wherein the disc is narrower than the ring.

9. The pump according to claim 8 wherein the outer surface second annular space at an angle, a plurality of pumping teeth of said disc is spherical and the inner surface of said teeth on on said disc mounted for rotary motion in said third annular said ring is spherical. space,

10. The pump according to claim 5 including a third pair of and te eth n sflid s ing with the p mping e h sidewalls positioned in a spaced relation to said first pair of on 52nd disc In said 11rd annulal' P sidewalls to define a third annular space intersecting said

Claims

1. A rotary pump comprising a casing having a number of cavities connected by annular spaces having sidewalls, a disc mounted for rotary motion in one of said annular spaces in said casing and having a plurality of equally spaced radially outwardly extending teeth on its outer periphery positioned to sealingly engage said sidewalls and to move through said cavities, a ring mounted for rotary motion in the other of said spaces in said casing in a plane oblique to the plane of motion of said disc and having a plurality of equally spaced radially inwardly extending teeth on the inner periphery positioned in a transverse relation to the direction of motion of said ring to sealingly engage said sidewalls and to mesh with the teeth on said disc at the points of intersection of the plane of motion of said disc and ring, said teeth on said disc being smaller in width than the teeth on said ring, one of said teeth on said ring always being in sealing engagement with said sidewalls at the said points of intersection to seal the cavities on one side of said points of intersection from the cavities on the other side of said points of intersection, whereby a pressure chamber is formed in the cavity at the point of engagement of said teeth and a suction chamber is formed at the point of disengagement of said teeth.

5. A rotary pump comprising, a casing having a first pair of sidewalls defining an annular space, a second pair of sidewalls defining a second annular space, intersecting said first annular space at an angle, a disc mounted for rotary motion in said first annular space and having a plurality of radially outwardly directed pumping teeth on its outer periphery, a ring mounted for rotary motion in said second annular space and having a plurality of radially inwardly directed sealing teeth on its inner periphery positioned in a transverse relation to the direction of motion of said ring to sealingly engage said sidewalls, said sealing teeth being larger in width than said pumping teeth and spaced for meshing engagement with said pumping teeth at the line of intersection of said annular spaces and being spaced apart a distance greater than the width of said pumping teeth, and a cavity in said casing on each side of said line of intersection of said spaces, one of said sealing teeth always sealingly engaging said sidewalls of said second annular space at the line of intersection of said annular spaces, whereby pressure chambers are formed on one side of the line of intersection of said spaces and suction chambers are formed on the other side of said line of intersection.

8. The pump according to claim 5, wherein the disc is narrower than the ring.

9. The pump according to claim 8 wherein the outer surface of said disc is spherical and the inner surface of said teeth on said ring is spherical.

10. The pump according to claim 5 including a third pair of sidewalls positioned in a spaced relation to said first pair of sidewalls to define a third annular space intersecting said second annular space at an angle, a plurality of pumping teeth on said disc mounted for rotary motion in said third annular space, and said teeth on said ring meshing with the pumping teeth on said disc in said third annular space.