US2621605A - Pump - Google Patents

Description

Dec. 16, 1952 C. MARK, JR

PUMP

4 Sheets-Sheet l Filed Oct. l2, 1945 C. MARK, JR

Dec. v16, 1952 PUMP 4 Sheets-.Sheet 2 Filed Oct. l2, 1945 C. MARK, JR

Dec. 16, 1952 PUMP Filed oct. 12, 1945 4 Sheets-Sheet 5 INVENToR.

C. MARK, JR

Dec. 16, 1952 PUMP 4 Sheets-Sheet 4 Filed 0G17. 12, 1945 INVENTOR. laxgU/Z /Vaf/c J/r, @fw-TW Patented Dec. 16, 1952 PUMP Clayton Mark, Jr., Wilmette, Ill., assignor to Clayton Mark & Company, Evanston, Ill., a corporation of Delaware Application October 12, 1945, Serial No. 621,908

23 Claims. (Cl. 10S- 149) This invention pertains to pumps.

Heretofore there have been a number of types of pumps used to deliver liquid from both deep and shallow wells and for otherwise moving liquid, such as pumps of the centrifugal, turbine, jet, reciprocating, compressed air and gear types. Certain of these pumps are satisfactory for pushing liquid, while others are satisfactory for suction installations, but the pumps are not always suitable for various types of installations.

It is, therefore, an object of this invention to provide a rotary type pump suitable for pumping liquid from either deep or shallow wells and adapted for use as either a suction type pump, or a sump or deep well type pump.

Another object of the invention is to provide a pump which is inexpensive to manufacture and maintain, is very simple in construction and has a minimum of moving parts.

Another object of the invention is to provide a pump wherein the rotatable parts are in balance, and whereby it is possible to avoid the use of numerous bearings,

Another object of the invention is to provide a pump wherein friction between the relatively moving parts is reduced to a minimum, and wherein there is natural lubrication between the engaging surfaces of the rotor and stator.

Another object of the invention is to provide a pump of high eiiiciency that can be used at any desired pressure, thereby overcoming difficulties incident to the use of centrifugal, and jet pumps.

Another object of the invention is to provide a pump so constructed that it is capable of pumping sandy or muddy water, such as is necessary in clearing out a well, the pump being capable of pumping such sludge without damage to the Dump.

Another object oi the invention is to provide a pump comprising a rotor and stator wherein the stator is so arranged that it acts as a bearing for the rotor.

Another object of the invention is to provide a pump which can be operated by any convenient source of energy, such as a motor, gasoline engine, windmill or the like, and wherein the rotor can be operated at any practical, desired speed.

Another object oi the invention is to provide a pump that is self-lubricating and wherein a steady stream of liquid is delivered instead oi a pulsating stream.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as. will be more fully described and particularly pointed out 2 in the specication, drawings and claims appended hereto. Y

In the drawings which illustrate embodiments of the device and wherein like reference characters are used to designate like parts- Figure 1 is a fragmentary sectional elevation showing a pump embodying the invention applied to the suction pipe of a well and wherein the pump is utilized as a suction pump;

Figure 2 is a fragmentary sectional elevation showing the adaptation of the pump embodying the invention to a deep well installation; Y

Figure 3 is an enlarged sectional elevation through one form of pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line 3-3 of Figure 4 Figure 4 is a top plan View of the stator of the pump illustrated in Figure 3;

Figure 5 is a top plan View of a modified form of stator for a pump embodying the invention;

Figure 6 is a top plan view of another modified form of stator for a pump embodying the invention;

Figure 7 is an enlarged sectional elevation through another form of pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line 1-1 of Figure 8;

Figure 8 is a top plan view of the stator of the pump illustrated in Figure 7 Figure 9 is an enlarged sectional elevation through another form of pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line 9-9 0f Figure 10;

Figure 10 is a top plan view of the stator of the pump illustrated in Figure 9;

Figure 1l is an enlarged sectional elevation through another form of pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line H-II of Figure 12;

Figure 12 is a top plan view of the stator of the pump illustrated in Figure 11;

rFigure 13 is an enlarged sectional elevation through a modied form of stator for a pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line` l3-l3 of Figure 14;

Figure 14 is a top plan view of the stator illustrated in Figure 13;

Figures 15 and 16 are velevations of modified forms of rotors adapted for use with the stator illustrated in Figures 13 and 14;

Figure 1'7 is a top plan view of the rotor illustrated in Figure 16 Figure 18 is an enlarged sectional elevation through another form of pump embodying the invention, the section through the stator being taken substantially in the plane as indicated by the line Iii-l Si of Figure 19;

Figure 19 is a bottom plan View of the pump illustratedin Figure 18 Figure 20 is a sectional elevation of another modied form of pump embodying the invention, the pump shown being a double acting type of pump, taken on line 2li- 2li of Figure 21;

Figure 21 is a top plan View of thepump shown in Figure 20; and

Figure 22 is a transverse sectional elevation of the pump shown in Figure 20, the same being taken substantially in the plane as indicated by the line 22--22 of Figure 20.

While two types of installations are illustrated in Figures 1 andZ, it is of course, understood that other types of installations are contemplated, such as a suction pump for petroleum products, or a sump pump for petroleum products. However, in Figure l an adaptation is illustrated wherein a suction type of pump is utilized, while in Figure 2 there'is illustrated a type of pump for a deep well installation. Thus Figures 1 and 2 illustrate in principle different typical installations.

In Figure 1 the suction pipe Sil extends below the ground level 32 and is provided adjacent its lower end with the well point 34 which extends into-the water strata 35i. The upper end of the pipe 3B is connected to the inlet 33 of the pump 4i). The pump 4I! is provided with the stator 42, a portion of which forms a part of the pump casing, and the rotor 44 is adapted to rotate therein. The upper end of the pump casing is provided with the outlet 46 connected to the delivery'pipe 48. The propeller shaft 5@ is connected to the rotor 44 and extends through a suitable stuffing box 52 provided in the pump casing and is adapted to be rotated by the motor-54.

While-a motor is shown in Figures l and 2, it is of course understood that any source of energy can be used, such as an electric motor, gas engine, windmill, etc. The rotor and stator are formed such as is particularly shown in Figures 3 to 20 L inclusive, and the operation thereof will be more particularly described with respect to these gures.

Rotation of the rotor 44 by means of the motor 54 causes suction to lift the liquid through the suction pipe 3! into the suction chamber 55 of the pump, being then pumped by the cooperative relation between the rotor and stator to the pressure chamber d from whence it is delivered to the discharge pipe 48.

In the construction illustrated in Figure 2 the casing Bil extends below the ground level 62, being closed by the welly cap 64, said casing extending to a point substantially below the liquid level 66 whereby liquid is adapted to enter the lower end of said casing. Drop pipe 6B extends through the well cap 64 and downwardly within the casing (iii, and the sections of the drop pipe may be connected as desired as by couplings 'IIL The lower end of the drop pipe isiconnected as at 'I2 to the outlet of the pump casing I4.

The casing 'I4 is provided with the stator l5 of the construction such as shown in Figures 3 to 20` inclusive, to be later more particularly described', and the inlet of the casing is connected as at 'I8 t0 the suction stub 80 provided with the foot valve 82. The rotor B4 is rotatably mounted in the stator 'I6 and is adapted to be rotated by the line or propeller shaft 8B which extends upwardly, provided with suitable bearings Sil connected through suitable spiders at couplings lil, the upper end of the propeller shaft passing through the stuffing box 92 provided in the outlet tting 94, being driven by the motor 96. As before pointed out, any source of energy may be used instead of the motor 96.

Rotation of the shaft 88, therefore, causes rotation of the rotor 34 which in turn causes the liquid to be Ysupplied by the rotor 84 to the pressure chamber It!) of the pump casing from whence it is pumped upwardly through the drop pipe, being deliveredto the outlet Ell.

In the modication illustrated in Figures 3 and 4, the stator IGZ comprises the outer metallic shell m4 to which is bonded the inner stator member ISS, said member being of resilient kmaterial and being provided 'with a resilient seal means iil` which is a partition or iiange biased inwardly of member IIl and extending lengthwise of the casing so that in effect it is 'a helical thread of innite pitch.

The seal IGS is adapted to be received within the recess II!) formed in the member |06 whereby when the member M38 is moved wholly within the recess I Iii, a substantially circular inner surface is provided. The rotor I I 2 is adapted to rotate within the stator, a suitable shaft being secured thereto as by the thread H4, `and said rotor is provided with a helical thread HE, said thread extending within the stator for substantially two and one-fifth (2l/'5) turns, i. e., for at least two turns, plus an arc suiiicient to span the seal Hi8. The outside diameter of the helical thread II makes a liquid tight ilt with the internal diameter of the stator and rotation of the thread causes the resilient seal Il to serially or gradually move within the recess I Iii from the inlet to the outlet as shown at IIS. In operation, therefore, the liquid between the body of the rotor and the internal diameter of the stator is conned by the adjacent turns of the helical thread into a long helical passageway extending from the inlet I to the outlet IZZ. Upon rotation of the rotor the seal Ill closes off this passageway to the inlet and forces the liquid up the channel to the outlet and upwardly between the threads and stator -to the outlet. While the rotor II2 is disclosed as a metallic member and the inner stator member It is disclosed as a resilient member, it is of course understood that the rotor may be composed of resilient material with sealing means and recess such as Idil and III), and the stator member I can be metallic and provided with an internal helical thread comparable to thread IIS.

In the modification illustrated in Figure 5 the stator comprises the outer cylindrical metallic casing member I24 and the inner resilient member IZB bonded thereto. A rotor similar to rotor II 2 is adapted to be used with the stator and instead of being provided with one seal IGS (Figure 4) and one recess I IIB, the resilient member |26 is provided with a plurality (shown ve) of seals I 28 each adapted to be received in a recess I upon movement of the rotor. In this instance the rotor, comparable to rotor II 2, is provided with a thread which extends for 360 plus a sui'iicient distance to insure one seal being closed at all times, i. e., at least 360, plus the spanning of two seals, or approximately one andl two iifthsl (1%) turns within the stator. In this instance, as well as in Figure 4, the thread is determined so as to close. the passageway at two places between the inlet and outlet. whereby the sealing means will force the water along the passageway as the seal is gradually received in recess l or |30 from inlet to outlet.

The passageways from inlet to outlet in Figure 5, as well as inFigure 4, are formed between the helical-'threads ofthe rotor (or stator in case the parts are reversed) and the rubber element which forms the sealing means.

In the pump illustrated in Figure 6, the iiuid passageways are not formed between the rotor and stator, butin the stator itself. In Figure 6 the stator comprises the outer metallic member |32 and the inner resilient stator member |34 bonded thereto; The inner member |34 is provided with the inner cylinder portion |36 connected to the outer cylinder portion |38 of the member |34 by the substantially diagonally extending partition members |40, similar to members |28, each of said members |40 being adapted to be depressed into recess |42. Passageways for the liquid to be pumped are thus formed wholly7 in the resilient element and the helical thread ofthe rotor acts as the sealing means t0 progressively collapse the passageways to force the liquid along said passageways. The rotor is provided with a thread of one and threefifths (1%) turns within the stator, i. e., at least one turn, plus the Width of the two passageways.

In Figures 7 and 8 a form of pump is shown which is designed to operate at higher pressures than the single seal pump shown in Figure 4. In this pump the stator comprises the outer cylindrical metallic member |44 and the inner resilient member |46 bonded thereto. At a predetermined point on the inner surface of the member |46 there is provided a partition |48 extending the length of the member |46, the partition v|48 forming with the member |46 a passageway |50 of substantially segmental shape. The partition |48, as well as the partitions of the other modifications, preferably is so shaped that when the partition is displaced by the helical rotor, it ts within the recess formed by passageway |50 so that the inner surface of the partition forms a continuous circle with the inner surface of the member |46, so that when the partition is moved to engage the arcuate portion of the passageway |50 (as it is of segmental shape), the partition exactly fits, whereby there is substantially the same thickness of member |46 continuously for 360. Thus the helical thread |52 of rotor |54 revolves against an essentially uniform diameter.

As before, the rotor is provided with connecting means |56 whereby it may be rotated and the seal (partition) must be crossed at least twice, plus the width of the seal or partition, by the helical thread within the stator. In this case rotation of the rotor entraps a non-compressible body of liquid in the passageway |50. The resilient material, being non-compressible, causes the sealed-off section of the material to lll the space between the successive thread crests of the helical screw and upon rotation of the rotor forces the liquid between threads from inlet |58 to outlet |60.

Thus the liquid is pumped both through the:

this type of pump is a combination of that of 6 the pump illustrated in Figures '3 and 6, that is, the helical thread acts as a seal for the liquid forced up passageway |50 and at the same time passageway |50 acts as a seal forcing the liquid up the passageways formed in the rotor between the adjacent turns of the thread. Therefore,

there is excellent lubrication for the rotor, and 1 as the seal is made of non-compressible material, increased pumping pressure advances the sealing point to a' point where it will hold the pumping pressure.

In the constructions illustrated in Figures 9 to 12 inclusive, the stator comprises the outer cylindrical metallic member |62 and the innerv resilient member |64. Member |64 is p-rovided with ve seals, that is, five partitions |66 are molded in the resilient member providing five passageways |68, said passageways extending from the entrance |10 to the outlet |12.

In the construction illustrated in Figure 9, the rotor |14 is provided with the helical thread |16 and means |18 for connection to a drive shaft, the thread |16 in this case makes at least oneA and one-fifth (1%) revolutions within the stator plus a suiicient amount to overlap one partition or seal. Thus the thread makes substantially one and two-fifths (1%) revolutions in order that the operating seal Will be closed twice in any possible position of the rotor. The thread therefor in the pump illustrated in Figures 9A and l0 can be much steeper than that shown in Figure 7 for example, so that one revolution of the rotor will deliver more liquid. n

In this instance the rotor would operate one seal |66 at any one instance. If the rotor illustrated in Figure 7 were used in Figure 9 the amount of liquid delivered would be the same as that delivered by the pump in Figure 7, but there would be ve seals operating at any one instance, so that the pump would deliver ve times the operating pressure of the single seal pump and still deliver the same quantity of liquid.

The pump can be made with one or more seals built in the stator and all of them can be operated by a rotor having one or more threads. More than one thread is desirable on the rotor as it is then possible to obtain a balance of pressure on the sides of the rotor and stator.

While single thread rotors operate satisfactorily at low head pressures in a stator with any number of retractible seals, the forces acting on the rotor will not be balanced and high head pressure will tend to force the rotor out of center with respect to the stator. This will tend to cause a vcondition of vibration. Bearings can, of course, be used, but to eliminate the use of bearings, the rotor should be designed 'so that the forces acting on the rotor are balanced. This can be accomplished by designing the rotor with two or more threads and operating it in a stator with an equal number of retractible seals, or a number of retractible seals that are a multiple of the number of threads on the rotor.

The capacity of the pump per revolution can be decreased and its working pressure increased by lessening the pitch of the threads on the rotor, providing the longer threads cross more seals. The same objectives can also be accomplished by increasing the diameter of the body of the rotor which will decrease the liquid delivered per revolution and strengthen the sealing means.

Further, it will be noted in the construction shown, the helices ofthe rotor and stator must notmatch and can be any pitch except z'ero.l

7. Where the passages are f'helically disposed` (Figures-13 land 14) the rotor may be provided with spaced-parallel axially disposed crests or projections (Figures 16'and 17) which may be described as threads with a pitch of iniinity.

A single seal pump that is 72 across the seal and with a single thread rotor of two and onefth (2 1k.) revolutions will give one sealing point and a unit capacity. Arotor of three and onefth (3l/5) turns in a single seal pump of the same length will give only 68.8% as much liquid, but can pump twice the pressure, as it is double sealed. A four 'andv one-fth (4%.) turn rotor in the same stator will deliver 52.5% as much liquid as one` with a twoand one-fth (2 1/5) turn rotor, butwill pump three times the pressure. Comparing this lone-seal pump with a ve seal pump, if both have a single thread rotor with one sealing point, the rotor of the one seal pump must have two and one-fifth (2l/5) turns and the rotor of the ilve seal pump must have one and two-fifths (1%) turns. The ve seal pump will, therefore, pump against the same pressure but will deliver 1.57 times as much liquid per revolution as the singleseal pump.

Again, if it is desired to use the same stators and single thread rotors to pump against twice they delivery pressure, the rotor on the single seal pump would have three and one-fifth (3 1/5) turns and the rotor on the ve seal pump would have one and three-fifths (13/5) revolutions of the single thread, the five seal pump would, therefore, deliver twice the liquid of the one seal pump.

Comparing the capacity of the single seal pump against the five seal pump, working against the same head pressure or each with one sealing point, the one seal pump using a single thread, and the ve seal pump using ve threads as shown in Figure 11, with ve threads, each thread would have three-fifths (375) of a revolution against the single seal pump with two and one- 'lfth (2l/5) revolutions. In this instance the stator |80 is provided with shaft securing means |82 and five helical threads |84. It, therefore, would deliver 3.67 times as much liquid.

Thus itl may be said that a single seal pump is illustrated in Figures 3 and 7, while a ve seal pump is illustrated in Figures 5, 9 and 11. However, the pump can be built with any number of seals, either in single, double or multiple rows until practically all of the liquid flows up the tubular seals `(passageways) with. justsuflicient liquid being pumped adjacent the rotor to provide adequate lubrication.

In the pump shown in Figures 13 and 14, the casing |86 of metal is provided withthe resilient stator |88 bonded thereto, the stator being provided with partitions- |90, shown ve in number, forming the passageways |92.

In this case the passageways are formed helically. Rotor |94 (Figure l5) may be utilized with. the stator illustrated in Figures 13 and 14, the rotor being provided with securing means |36 for attachment to a suitable propeller shaft. In this case the rotor is a iive thread rotor, being provided with the threads |98, and where used with theA stator shown in Figure 13 threads |38 must not match the helical passages of Figure 13 where they contact the partitions of the stator.

The rotor shown in Figures 16 and 17 may also be utilized, the rotor 200 being provided with securing means 204 for attachment to a propeller shaft for rotating the rotor. In this case the rotor is yprovided with five threads 206 of infinite pitch that is, the threads, crests or spaced ribs or projections 206 are parallel to eachother and to the longitudinal axis of the rotor (axis of rotation), extending in the direction of said axis. Rotation of either of the `rotors illustrated in Figures'15 or 16 serially operates the partitions |90 (gradually closes the passageways from inlet to outlet) for forcing liquid from the inlet 208 of the stator illustrated in Figures 13 and 14 to the outlet 2|0, the liquid passing lupwardly of the passageways and upwardly between the rotor and stator. l y

In the pump illustrated in Figures 18 and 19 the metallic stator 2|2 is provided with a helical thread 2M extending from the inlet 2|6 to the outlet 2|8'. The rotor 220, of resilientv material, is provided with these'curing means 222 on rod 22| secured to the rotor for fastening the rotor tol a suitable propeller shaft, and said rotor is providedv with the outwardly extending partitions 224 forming passageways '226. The rotation of the rotor then causes the passages to be serially collapsed (closed gradually from inlet to outlet), forcing the liquid from the inlet 2|6 to the outlet 218 up said passageways 226 and up the passageways 228 between the rotor and the successive turns on the stator.

Referring now to the double acting pump shown in Figures 20 to 22, said pump includes a metallic casing 300 adapted to be connected at its upper end to dispensing means (not shown), the lower end being provided with the spider 302. The lower end of the casing may be connected to a suction stub or pipe as shown in Figures 1 and 2.

The spider 3D2 is provided with the openings 304, and is provided kwith the xed center post 306 extending upwardly of the casing. The center post supports the inner resilient stator 308 which in the embodiment shown is provided with the flanges or partitions 3 I 0 (of any number and disposition) biased outwardly to form passageways 3I2.

The rotor 3|!! is rotatably disposed to embrace the inner stator, being provided with the internal thread 3|6 extending for at least substantially two turns adapted to gradually close the passageways of the inner stator from the inlet 3| to the outlet 320kk to pump liquid upwardly, as described. The upper portion of the rotor is provided with apertures 322 for permittingthe upward passage of liquid and the rotor is provided with securing means 324 for attachment to a suitable propeller shaft.

The outer casing 300 is provided with the resilient outer stator 326, bonded to said casing and provided with the inner flanges or partitions 328 biased inwardly providing passageways 330 extending from inlet 3|8 to outlet 320. The rotor is provided with external threads 332 similar to threads 3|6 for gradually closing said passageways 330 from the inlet to the outlet to pump liquid upwardly of the outer stator.

Though inner and outer flanges 3||| and 320 are shown, it is of course understood that partitions as shown in Figure 12 may be used and also the parts may be reversed on rotor and stators.

In operation, therefore, the rotor operates in a concentric manner about the axis of the stator and rotation of the rotor serves to gradually close the inner and outer passageways from inlet to outlet, as described with respect to the other modifications, causing upward pumping of the liquid through the stators by the rotor and between the stators and rotor, the inner and outer stators causing, in effect, a double action of pumping by the pump.

In order yto increase delivery pressure and to meet high head pressures, the pumps shown herein may be slightly modiiied in one or more of the'following different ways. The rotor may be slightly tapered, enlarging toward the outlet. The stator may be tapered, constricting the passageways toward the outlet. The sectional area of the passageways may be decreased toward the outlet. The pitch of the threads may be progressively reduced from the inlet to the outletl on either the rotor or stator.

In the forms of pumps shown, the primary elements are a rotor and a stator, each being provided With a helical element of any pitch except zero and even includes spaced elements extending axially of the rotor as is shown in Figure 16. One element-is preferably made of rigid material such as a metal, examples of which are stainless steel, brass, etc., that is, one preferably that is rustless, the other part being made of a resilient material, which is provided with a retractible or collapsible seal, said resilient material being chosen in accordance with the liquid to be pumped and may be natural rubber, synthetic rubber, plastics, or compounds thereof. The resilient material is chosen to have long life, to be resilient and to be resistant topetroleum products and other corrosives, and such material is substantially non-compressible.

Also it is noted that while metal is recited as being used to form the rigid member, other substitute material may be used as rigid material of plastic, etc. Further, while certain types of re- -tractible seals are shown, any type of seal may be used.

Further, the rotor can be rotated as fast as desired, from a standpoint of the life of the rubber. Insofar as motors are concerned at the present time, approximately 1,750 R. P. M. has been -found to be a good economical speed, though other prime movers rotating at other speeds may be used.V f

It is to be understood that this application is -not to be limited by the exact embodiments of -the deviceshown, which are merely by yway of illustration and not limitation as various and `other 'forms ofthe device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims. V

I claim: Y

l. An axially progressive rotary pump comprising a propelling member and a sealing member mounted for concentric rotation with respect to one another, said propelling member havingV Va channel portion, said sealing member havinga resilient sealing portion slidably engaging said channel portion, at least one of said portions being helical, said engagement between Seid P01'- tions progressing axially upon concentric rotation between said propelling member and'said sealing member, forcing fluid in said channel to progress axially, and means for rotating 011e f said members with respect to the other.

2.`An axially progressive rotary. pump com.- prising a resilient member and a rigid member adapted for relative concentric rotation, .means -for rotating one of said members-'with' respect'to the other, said rigid member 'being plOYl-ed Wm? atleast one channel portion, said resilient member having a sealing portion havingsliding engagement with said rigid member to divide said channel into at least one fluid-tight compartment formed in part by said rigid member and in 'part by said sealing means, at least one of Sld 10 portions being helical, said compartment progressing axially upon relative concentric rota.- tion between said members.

3. An axially progressive rotary pump comprising a resilient member and a rigid member adapted for relative concentric rotation, means for rotating one of said members with respect to the other, said rigid member being provided with at least one thread element extending radially thereof to provide a channel portion, said resilient member having at least one sealing portion extending into slidable sealing engagement with said rigid member to divide said channel into at least one fluid-tight compartment formed in part by said rigid member and in part by said sealing portion, one of said portions extending generally helically with respect to said members whereby said compartment progresses axially of said members upon relative concentric rotation therebetween.

4. An -axially progressive rotary pump comprising a resilient member and a rigid member adapted lfor relative concentric rotation-means for rotating one oi' said members with respect to the other, said rigidl member'being provided with a plurality of thread elements extending radially thereof to provide channel portions, said resilient member having at least one sealing portion extending int-o slidable l.sealing engagement with said rigid member to divide said channels into rluid-tight compartments formed in parl? by said rigid member and in part by said sealing portion, one of said portions extending generally helically with respect to said members whereby said compartments progress axially of said members -upon relative concentric rotation therebetween.

5. An axially progressive rotary pump comprising a resilient member and a rigid member adapt- -ed i'or relative concentric rot-ation, means for r0- tating lone of' said members with respect to the other, said rigid member being provided with at least one thread element extending radially thereof to provide a channel portion, said resilient member having a plurality of sealing portions extending into slid-able sealing engagement with said rigid member to divide said channel into iluid-tight compartments formed in part by said rigid member and in part by said sealing portions, one of said portions extending `generally helically with respect to said members whereby said compartments progress axially of said members upon relative concentric `rotation therebe. tween.

An axially progressive rotary pump comprising a resilient member and a rigid member adapted for relative concentric rotation, means for rotating one of said members with respect to the other, said rigid member being provided with a plurality oi' thread elements extending radially thereoi` to provide channel portions, Isaid resilient member having a plurality of sealing portions extending into slidable sealing engagement with said rigid member to divide said channel intoV iiuid-tight compartments formed in part by said rigid member and in part by said sealing portions, one of said portions extending generally helically with respect to said members whereby said compartments progress axially of said members upon relative concentric rotation therebetween. n 1

7. An axially progressive rotary pump comprising a resilient stator member land a rigid rotor member mounted lfor concentric rotation therein, means for rotating said rotor member,

said rotor member being formed. with at least one helically arranged thread element extending radially thereof to provide a channel portion, said stator member having at least one sealing portion extending into slidable sealing engagement with said rotor member to divide said channel portion into at least one fluid-tight compartment formed in part by said rotor member and in part by said sealing portion whereby said compartment progresses axially of said members upon rotation of said rotor member.

8. An axially progressive rotary pump comprising a resilient stator member and a rigid rotor member mounted for concentric rotation therein, means for rotating said `rotor member, said rotor member being formed with a plurality of helically arranged thread elements extending radially thereof to provide channel portions, said stator member having at least one sealing portion extending into slidable sealing engagement with said rotor member to divide said channel portions into fluid-tight compartments formed in part by said rotor member and in part by said sealing portion whereby said compartments progress axially of said members upon rotation of said rotor member.

9. An axially progressive rotary pump comprising a resilient stator member and a rigid rotor member mounted for -concentric rotation therein, means for rotating said rotor member, said tending into sealing engagement with said rotor 2,-.

member to divide said channel portion into fluid tight compartments formed in part by said rotor member and in part by said sealing portions whereby said compartments progress axially of said members upon rotation of said rotor member.

10. An axially progressive rotary pump comprising a resilientstator member and a rigid rotor member mounted for concentric rotation therein, means for rotating said rotor member, said rotor member being formed with a plurality of helically arranged thread elements extending radially thereof to provide channel portions, said stator member having a plurality of sealing portions extending into slidable sealing engagement with said rotor member to divide said channel into Huid-tight compartments formed in part by said rotor member and in part by said sealing portions whereby said compartments progress axially of said members upon rotation of said rotor member.

11. An axially progressive rotary pump comprising a rigid stator member and a resilient rotor member mounted for concentric rotation therein, means for rotating said rotor member, said stator member being formed with at least one helically arranged thread element extending radially thereof to provide a channel portion, said rotor member having at least one sealing portion extending into slidable sealing engagement with saidistator member to divide said channel portion into at least one fluid-tight compartment formed in part by said stator member and in part by said sealing portion whereby said compartment progresses axially of said membersvupon rotation of said rotor member.

12. A n axially progressive rotary pump, comprisingha rigid stator member and a resilient rotor member mounted for concentric rotation therein, means for rotating saidroto'r member,

said stator member being formed 'with a plurality of helically arranged thread elements extending radially thereof to provide channel portions, said rotor member having at least one sealing portion extending into slidable sealing engagement With said stator member to divide said channel portions into fluid-tight compartments formed in part by said stator member and in part by said sealing portion whereby said compartments progress axially of said members upon rotation of said rotor member.

13. An axially progressive rotarypump comprising a rigid stator member and a resilient rotor member mounted for concentric Yrotation therein, means for rotating said rotor member, said stator member being formed vwith at least one helically arranged thread element extending radially thereof to provide-a channel portion, said rotor member having a plurality o sealing portions extending into slidable sealing engagement with said `stator member to divide said channel portion into fluid-tight compartments formed in part by said stator member and in part by said sealing portions whereby said compartments progress axially of said members upon rotation of said rotor member.

14. An axially progressive rotary pump comprising a rigid stator member and a resilient rotor member mounted for concentric rotation therein, means for rotating said rotorimember, said stator member being formed with a plurality of helically arranged thread elements extending radially thereof to provide channel portions, said rotor member having a plurality of sealing portions extending into slidable sealing engagement with said stator member to divide said channel portion into fluid-tight compartments formed in part by said stator member and in part by said sealing portions whereby saidl compartments progress axially of said members upon-rotation of said rotor member.

15. An axially progressive rotary pump according to claim 3, in which the rigid member is provided With at least one ,helically arranged thread and in which the resilient member is provided with a plurality of sealing portions extending into slidable sealing engagement with thekrigid member each comprising a deformable Apartition forming in part a passageway extending axially of the resilient member.

16. An axially progressive rotary pump according to claim 3, in Which the rigid member constitutes a rotor and is provided with an helically arranged thread and in'which the resilient member constitutes a part of a stator having a plurality of sealing portionsextending into slidable sealing engagement withthe rotor each of which comprises a deformable partition forming in part a passageway extending axially of the stator.

17. An axially progressive rotary pump according to claim 3, in which the rigid member is provided with at least one helically arranged thread and in which the resilient member is provided with a sealing` portion extendinginto slidable sealing engagement with the rigid member and comprising a deformable partition forming in part a passageway extending axially of the resilient member.

18. An axially progressive rotary pump according to claim 3, in which the rigid member constitutes a rotor and is provided with an helically arranged thread and in which the resilient member constitutes apart of a stator having a sealing portionl extending into slidable sealing engagement With the rotor .and comprisingafde- 13 formable partition forming in part a passageway extending axially of the stator.

19. An axially progressive rotary pump according to claim 3, in which the rigid member is provided with at least one helically arranged thread and in which the resilient member has inner and outer tubular portions interconnected by substantially diagonally extending partitions to provide a plurality of passageways extending axially thereof whereby one of the tubular portions form sealing portions extending into slidable sealing engagement with the rigid member.

20. An axially progressive rotary pump according to claim 3, in which the rigid member constitutes a rotor and is provided with at least one helically arranged thread and in which the resilient member constitutes a part of a stator and has inner and outer tubular portions interconnected by substantially diagonally extending elastic partitions to provide a plurality of passageways extending axially thereof, the inner tubular portions being elastic and extending into slidable sealing engagement with the rotor.

21. An axially progressive rotary pump according to claim 3, in which the rigid member constitutes a stator and is provided with at least one helically arranged thread on the inner surface member is provided by a deformable flange forming in part a recess extending axially of the resilient member and connected to the resilient member adjacent one side of the recess.

23. An axially :progressive rotary pump according to claim 3, in which the rigid member constitutes a rotor and is provided with at least one helically arranged thread and in which the resilient member constitutes a stator having a recess extending axially adjacent the inner surface thereof defined in part by a straight flange connected to the resilient member adjacent one side of the recess and extending inwardly thereof to provide a sealing portion extending into slidable sealing engagement With the rigid member.

CLAYTON MARK, JR.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,874,667 Wada Aug. 30, 1932 2,015,123 Pennell Sept. 24, 1935 2,028,407 Moineau Jan. 21, 1936 2,258,371 Wernert Oct. 7, 1941 2,293,268 Quiroz Aug. 18, 1942 2,336,580 Yeatman Dec. 14, 1943 2,409,688 Moineau Oct. `22, 1946 FOREIGN PATENTS Number Country Date 1,746 Great Britain 1854 113,009 Australia Apr. 28, 1941 443,134 Great Britain Feb. 21, 1936 484,479 Great Britain May 2, 1938

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