US2394120A

US2394120A - Pump with split cylinder

Info

Publication number: US2394120A
Application number: US419058A
Authority: US
Inventors: Warren R Tucker
Original assignee: Hydraulic Development Corp Inc
Current assignee: Hydraulic Development Corp Inc
Priority date: 1941-11-14
Filing date: 1941-11-14
Publication date: 1946-02-05
Anticipated expiration: 1963-02-05

Description

Feb. 5, 1946.

w. TUCKER PUMP WITH SPLIT CYLINDER Filed Nov. 14, 1941 2 Sheets-Sheet 1 av m I. luv In. I n WARREN kJucnz'n,

Annual":

Feb. 5, 1946. w, R, TUCKER 2,394,120

v PUMP WJTHSPLIT CYLINDER Filed Nov. 14, 1941 2 Sheets-Shet 2' Avruuvs Patented Feb. 5, 1946 PUMP wrrn SPLIT CYLINDER Warren It. Tucker, Dayton, Ohio, assignor to The Hydraulic Development Corp. Inc., Wilmington, Del., a corporation oi Delaware Application November 14, 1941, Serial No. 419,058

7 Claims. (Cl. 103136) This invention relates to a fluldpump and particularly to a pump of the rotary type for circulating a liquid.

An object of the invention is to provide a rotary pump having a solid rotor and a split cylinder.

Another object of the invention is to provide a rotary pump wherein a more rugged construction is used for retaining the cylinder and rotor in cooperative working relationship.

Another object of the invention is to provide a rotary pump having a minimum number of fastening means for holding the cylinder and rotor in assembled relationship. 3

Another object of the invention is to provide a rotary pump wherein the end walls of the rotor are integral with the body of the rotor, the

cylinder associated therewith being split parallel to the axis thereof to permit assembly upon the rotor.

It is another object of the invention to provide a rotary pump of the vane type wherein the body of the rotor and the end walls tor the same are a unitary structure and the cylinder thereof is divided to permit assembly upon the rotor.

Another object of the invention is to provide a variable delivery pump constructed in accordance with the foregoing obiects.

Another object of the invention is to provide a reversible and variable delivery pump con structed in accordance with the foregoing objects.

Another object of the invention is to provide a pump housing and pump stimcture for location within the housing" which is more compact and more ruggedit is another object of the invention to provide a rotary pump having e. cylinder divided along the axis thereof.

Another objectoi the invention is to provide a rotary pump having the cylinder divided along the axis thereof wherein means is provided for aligning the cylinder halves.

Another object oi the invention is to provide a rotary pump having a cylinder divided along the axis thereof with means for aligning the cylinder halves both longitudinally of the axis and transversely of the axis of the cylinder.

Further objects and advantages will become apparent from the drawings and the following description.

In the drawings:

Figure 1 is a longitudinal cross-sectional view of a rotary or vane pump built in accordance with the teachings of this invention and is taken along line i-l of Figure 2.

Figure 2 is a transverse cross-sectional view of the pump taken along line 2-2 of Figure 1.

Figure 3 is an end elevational view of the cyl- I inder and rotor oi the pump of Figures 1 and 2 shown in their relative positions prior to assembly.

Figure 4 is a cross-sectional'view oi the means for securing together the parts of. the cylinder,-

taken along line 4-4 of Figure 2.

Figure 5 is a perspective elevational view of the structure for aligning halves with respect to one another longitudinally and transversely or the axis of the cylinder. I

The pump of this invention is of the rotary type for moving a body of liquid and for placing the same under pressure. The conventional rotary pump consists of a rotor driven by a suitable power shait and rotated within a suitable cylinder bore. End plates are secured to the rotor or the cylinder to provide a pumping chamber between the rotor and the cylinder. Liquid is drawn into the pump by rotation of the rotor and is discharged under pressure from the opposits side of the pump.

When rotary pumps are used to develop high liquid pressures there is considerable tendency for the fastening means securing the end plates to the rotor or cylinder to stretch and pet leakage of high pressure liquid. Therefore, it

becomes important to produce a rotor and cyl inder structure which will have a. minimum mum her oi bolts securing the assembly.

In this invention the rotor of the pump and the end plates normally associated with the re tor are produced us u one-piece unit. The cyl inder associated with the rotor is divided along the axis of the cylinder to provide two halves which can be bolted together when in position adjacent the rotor to produce a pump assembly. The structure of this invention thereby uses only two bolts to assemble the rotor and cylinder in their operating relationship.

The rotary pump of this invention will be described with particular reference to a vane type rotary pump. However, it is to be understood that the structure disclosed in this invention is not limited to a vane type rotary pump but can be used in connection with other forms of the tation of the pump or the position of. the cylinder with respect to the rotor. The liquid flow passages l2 and I! are connected to the chamber II by means of the passages l4 and I5 respectively.

-The pump unit locatedwithin the chamber consists of a rotor 29 and a cylinder 25.

The rotor 20 is a one-piece unit and consists of a cylindrical body portion l8 having annular flanged portions l1 and I8 which form and plates associated with the body portion I6. The end plate I1 is integral with a shaft l9 which forms the drive shaft of the rotor 28. The shaft I8 is bearinged within the casing II by means of the ball bearing 2| which is suitably positioned within a recess 22 in the chamber The end plate l3 has a cylindrical extending portion 23 forming a shaft for supporting the end plate Ill. The shaft 23 is supported by means of a ball bearing 24 suitably carried within a recess 26 provided in a cover or end plate 21.

The end plate 21 is secured to the casing III by v means of the bolts 28.

The rotor 20 has an axial bore 29 and an axial bore 38 of somewhat less diameter than the bore 29. The rotor 28 is also provided with a plurality of slots 3| which may extend radially from the axis 01' the rotor 28. These slots are of the same length as the distance between the end plates l1 and I8 and extend completely through the body portion l6 of the rotor 28.

Vanes 32 are carried in the slots 3| and are of substantially the same size as the slots 3| to provide a sliding relationship therebetween. The outer ends 33 of the vanes 32 engage the cylinder bore 35 of the cylinder 25, while the inner ends 34 of the vanes 32 engage a frusto-conical shaped member 48. The inner ends of the vanes 34 are provided with an angular surface along the length of the vanes 32 to match the angular shaped surface of the frusto-conical shaped member 48. Sincethe inner ends 34 of the vanes 32 engage the member the outer ends 33 of the vanes 32 will be maintained in engagement with the cylinder bore 35 at all times.

The frusto-conical shaped member 49 is located within the axial bore 29 provided in the rotor 20 and is urged in a rightward direction, as viewed in Figure 1 by means of a piston plunger 36 slidably positioned within the axial bore 30. A compression spring 31 urges the piston plunger 36 against the lefthand end of the member 40 so that the angular walls of the member 49 will urge the vanes 32 outwardly as heretofore disclosed.

The righthand end of the axial bore 29 in the rotor 20 is threaded to receive a threaded plug 39, the inner end of which is in engagement with the righthandend of the member 40, whereby do not'interfere with'any of the operating mechanism.

Since the rotor 20 is a one-piece element and the cylinder-'25 is a two-part element the only fastening means required for assembling the cyiinder and the rotor in working relationship are the two

bolts

41 and 48. Therefore, the ruggedness of the rotor and the cylinder is greatly increased and the tendency toward separation of the working parts of the rotor and cylinder is eliminated since the

bolts

41 and 48 can be made sufficiently large to absorb any pressure which can be developed by the pump.

The cylinder 25 is slidably positioned within the chamber between the parallel walls 49- and 50, the cylinder 25 having cooperating parallel walls for engagement therewith. Actuating members 5| and .52 extend through the wall of the chamber through the openings 53 and 54 into engagement with opposite sides of the cylinder 25. The actuating members 5| and 52 may be connected to suitable mechanisms for shifting the position of the cylinder 25 with respect to the rotor 20 to vary the eccentricity between the rotor and the cylinder and thereby vary the ca pacity of the pump, or if the eccentricity is reversed from that shown in Figure 2 the delivery from the pump will be reversed. The controls for actuating the members 5| and 52 can be either manual or automatic controls and are well known in the art of variable delivery fluid pumps and further discussion thereof is not deemed necessary.

Since the cylinder 25 is constructed in two half segments 4| and 42 it becomes necessary to align the half segments both longitudinally and transversely with respect to the axis of the cylinder bore 35. Such an alignment is required to permit the vanes to pass over the dividing line between the cylinder segments 4| and 42 and also to locate cooperating exterior faces 55, 56 and 51, 58 of the cylinder segments in the same plane so that the end plates "and I8 will seal against the the member 40 is positioned with respect to the 60 and 45 respectively in the opposite segment. The

bolts

41 and 48 can be as large in diameter as desired, since they extend through the cylinder body and can be positioned in a manner that they parallel exterior faces 55, 58 and 51, 58 of the cylinder segments 4| and 42.

Each of the cylinder segments has its parting face provided with a shoulder and a key slot which cooperates with a shoulder and a key slot in the cooperating parting face of the opposite cylinder segment. In Figure 5 there is shown one of the parting faces of the cylinder segments 4| and 42 and particularly the parting face of the righthand side of the lower cylinder segment 42, as viewed in Figure 3.

The partingface of the lower cylinder segment 42, as shown in Figure 5, consists of a plane area 59 and a plane area 68 which are joined by a vertical shoulder 6|. The bolt hole 44 extends through the parting face at right angles thereto. The vertical shoulder 6| is positioned approximately midway across the parting face of the segment 42 with respect to the longitudinal axis of the cylinder 25 and radially from the axis. of the cylinder 25.

As shown in Figure 3, the high plane area of the righthand side of the lower segment 42 is positioned toward the rear thereof, while the low plane area is positioned toward the front of the figure. The position of the plane areas 59a andBlla on the lefthand side of the lower se structed'in the same manner as the parting face shown in Figure and the location of the plane areas of the parting faces 62 and 83 are arranged to cooperate with the parting faces of the lower cylinder segment in a manner that the vertical shoulders between the plane areas are in engagement with each other to position the cylinder segment 4| with respect to the cylinder segment 42 longitudinally of the axis ofthe cylinder bore 35.v The Shoulders 6| between the plane areas of the parting faces thereby locate the exterior faces 8!, 58 and 51, 58 of the cylinder segments 4| and 42 in parallel planes.

To locate the transverse position of the segments with respect to one another and thereby establish a perfect cylinder bore a recess 84 is provided in the plane area 59 and a recess 65 is provided in the plane area 60, as shown in Figure 5. The

recesses

64 and 65 are located at right angles to the shoulder BI and are in parallel alignment with the axis of the cylinder bore 35. The parting face of the upper cylinder segment 4i cooperating with the parting face of the lower cylinder segment is provided with corresponding recesses therein. as shown in Figure 4, these recesses being indicated by the

numerals

66 and 61. A key 68 is placed within the cooperating recesses 64 and 86 and a' corresponding key 69 is placed in the cooperating recesses 65 and 61. The keys 68 and 69 provide means to align the cylinder bore of the upper segment 4|.with a cylinder bore of the lower segment 42 in a transverse relationship with respect to the axis of the cylinder bores.

With the cylinder segments 4i and 42 arranged in their proper aligned relationship the

bolts

41 and 48 can be tightened to retain the alignment and assemble the divided cylinder upon the one-piece rotor 20.

It may thus be seen that the applicant has provided a pump structure wherein there is required the use of only two bolts to maintain the assembly in proper working relationship and which bolts can be of the size necessary to withstand the maximum force tending to separatethe cylinder segments. While other bolts 28 hold the cover plate 21 to the casing l0, yet these bolts do not absorb any strain developed by the pressure within the pump and are thus relativelyunimportant from. the standpoint of assembly of the pumping unit itself.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a rotary pump comprising a one-piece rotor including a cylindrical body portion and parallel end plates, a multiple-part cylinder for said body portion, said cylinder being divided substantially parallel with the axis thereof to permit assembly upon said rotor body portion body, said cylinder parts having cooperating engaging paired faces disp sed parallel to the axis of the cylinder, each of said faces comprising plane areas offset laterally of the cylinder axis and joined by a shoulder disposed substantially normal to the axis of the cylinder, the engaging faces of each pair being complementary to align said cylinder parts in the direction of the axis of the cylinder and position the cooperating end face walls of the cylinder parts in planar relationship for engaging said end plates on said rotor when said complementary shoulders are in contact, there being mating key slots in each cooperating face, substantially normal to said shoulders to jointly form a key-retaining slot for receiving a key to align said cylinder parts in a direction normal to, the axis of said cylinder.

3. A rotary pump comprising a one-piece rotor including a'cylindrical body portion and parallel end plates, a multiple-part cylinder divided parallel with the axis thereof to permit assembly upon said rotor body and between said end plates and in rotary and sealing engagement with the end plates, said cylinder parts having cooperating engaging paired faces disposed parallel to the axis of the cylinder, one of each of said paired faces comprising plane areas oflset laterally of the cylinder axis and connected by a shoulder disposed angularly to the axis of the cylinder and ex-' tending completely across said face for cooperative engagement with a cooperating shoulder on between said end plates, said cylinder parts having cooperating engaging paired faces disposed substantially parallel to the axis of the cylinder, each of aid engaging pair of faces comprising two plane areas offset laterally to the axis of the cylinder and connected by a shoulder, disposed ang'ularly to the axis of the cylinderthe engaging faces of each pair being complementary to align said cylinder parts longitudinally along the axis of the cylinder when said shoulders are in contact.

2. In a rotary pump, a rotor including a cylindrical body portion and parallel end plates, a multi-part cylinder divided parallel with the axis thereof to permit assembly upon said rotor the cooperating engaging face, the meeting faces of each pair being complementary to thereby align said cylinder parts in a direction longitudinally of the cylinder axis and position the onoperating end face walls of the cylinder parts in planar relationship for rotary engaging relationship with said end plates on said rotor, these being mating'key slots in each of said cooperating faces, each slot being disposed angularly to said shoulders and extending across said shoulders, and a key fitting the slot conjointly formed by each mating pair of slots to align said cylinder parts in a direction normal to the axis thereof.

4. A rotary pumpcomprising a, rotor including a cylindrical body and parallel and plates, a multipart cylinder divided parallel with the axis thereof to permit assembly upon said rotor body between and in sliding and sealing engagement with the end plates, said cylinder parts having meeting pairs of faces-disposed parallel and substantially coplanar with the axis of the cylinder, one a cylinder part in planar relationship for rotation in contact with said end plates, there being mating key slots in each of said cooperating faces,

respectively, each slot being disposed angularly across said shoulders, at key fitting the slot cons jointly formed by each pair of mating slots and aligning said cylinder parts normal to the axis thereof to position the same to form a true cylindrical cavity for said rotor body, and bolt means extending through apertures intercepting the corresponding shoulders and key slots to secure said cylinder parts together.

5. A variable delivery fluid pump including, 'a casing having parallel walls forming guiding 'surfaces for a cylinder movable therein, a one-piece rotor including a cylindrical body portion and parallel end plates extending radially therefrom and supporting shai't portions bearinged in said casing, a multiple-part cylinder divided along the axis thereoi positioned in cooperating relationship with said rotor and in engaging relationship asaaiao cylinder normal to the axis of said rotor ror changing the eccentric relation ,therebetween and thereby changing the discharge capacity oi said with said end plates to provide a compression chamber, bolt means for holding said cylinder parts in assembled relationship, and parallel suriaceson said cylinder disposed parallel to the axis theme! and parallel with the dividing plane between the cylinder parts for engaging said parallel surfaces in saidcaslng in sliding relationship therewith whereby to permit movement of said cylinder normal to the axis 01' said rotor for changing the eccentric relation therebetween and thereby changing the discharge capacity oi said pump. v

6. A variable delivery fluid pump includins, a casing having parallel walls iorming guiding suriaces for a cylinder movable therein, arotor including a cylindrical body portion, parallel end plate extending normal to the axis thereof and supporting shaft portions Journaled in said casing, a multiple-part cylinder divided along the axis thereof positioned in cooperating relationship with said rotor and in engaging relationship with said end plates to provide a compression chamber. bolt means ior holding said cylinder parts in assembled relationship, parallel urfaces on said cylinder disposed parallel to the axis thereof and parallel with the dividing plane between the cylinder parts for engaging said parallel surfaces in said casing in sliding relationship therewith whereby to permit movement oi said pump, said cylinder parts having cooperating engaging paired iaces disposed parallel to the axis oi the cylinder. each face oi said paired iaces comprising parallel flats oiiset laterally oi said cylinder axis and Joined by a shoulder disposed substantially normal to the axis of the cylinder, the iace oi each pair being complementary to thereby align said cylinder parts along the axis oi the cylinder and position the cooperating end face walls oi the cylinder parts in coplanar relationship, them being matching key slots in each 1 oi said paired iaces, each slotbeing disposed substantially normal to the correspondingshoulder, and a key fitting the slot formed conjointly by each matching pair oi slots to thereby align said cylinder parts laterally oi the axis thereof so that said parts coniointly iorm a true cylinder.

7. In a rotary pump, a rotor including a cylindrical body having parallel and plates normal WARREN R. TUCKER.