US2465595A - Positive displacement oscillating roller vane pump having constant delivery - Google Patents

Description

March 29, 1949. H. J. KRATZER POSITIVE DISPLACEMENT OSCILLATING ROLLER VANE PUMP HAVING CONSTANT DELIVERY Filed Aug. 18, 1944 2 SheetsSheet 1 2,465,595 ROLLER 2 Sheets-Sheet 2 Iii/6%)! iii/frugaldzfify.

March 29, 1949. H. J. KRATZER POSITIVE DISPLACEMENT OSCILLATING VANE PUMP HAVING CONSTANT DELIVE Filed Aug. 18, 1944 Patented Mar. 29, 1949 POSITIVE DISPLACEMENT OSCILLA'IING ROLLER VANE PUIWP HAVING CONSTANT DELIVERY Herbert J. Kratzer, St. Louis, Mo.

Application August 18, 1944, Serial No. 549,978

6 Claims. i

This invention is a furthering of the pump or blower structure disclosed in my U. S. Letters Patent No. 2,095,987, the instant application having for one of its objects, the provision of means whereby a light-weight and noiseless pump having a large capacity to size ratio, and easily adapted to mass production, is provided.

Another object is to provide a positive displacement pump with means whereby the rotor elements thereof automatically maintain an eflicient seal to the housing walls, with a minimum of friction drag.

A further object is in providing improved means in the pump structure to compress the charges prior to the displacement thereof, with a minimum of volume carry-over to suction side of pump.

Another further object is to provide the pump with improved means to facilitate the assembly of a plurality of pumping chambers within a common circular housing, to suppress pulsation at the common constant delivery discharge port.

Still another object is to provide improved means for mounting and keyingthe rotor elements of the plurality of pumping chambers, on a common drive shaft in fixed radial relation to one another, for best dynamic balance and least pulsation of torque demands.

Another still further object is to provide an improved roller-vane-type of positive delivery pump.

Other objects and advantages will appear as the description progresses and by reference to the drawings, in which:

Figure 1 is a transverse vertical sectional elevation taken approximately on the line l-l of Fig.

Figure 2 is an elevation similar to Fig. 1, showing difierent operating positions of certain of the rotors.

Figure 3 is a longitudinal vertical section taken through the pump housing of Fig. 1, with the rotors shown in full lines.

Figure 4 is a fragmentary longitudinal sectional elevation taken approximately on the line 5-4 of Fig. 1.

Referring by numerals to the several figures of the accompanying drawings 5 designates a horizontally disposed cylindrical housing having a base 5 with an elongated discharge port I therein extending the length of the housing and disposed on one side of the longitudinal vertical center of the housing,

An elongated inlet port 8 which also extends the length of the housing 5, is formed in the wall 2 of'the housing at an approximate right angle to the discharge port 7, both of said ports being provided with a series of spaced transverse bars 9 with their inner surfaces in flush circumference with the inner periphery ll) of the housing 5.

One end of the housing 5 is closed by a removable end wall II and the opposite end of the housing being provided with an integral wall l2 and removably mounted in spaced relation by dowel pins 53 within the housing are a pair of walls 54 and 15, for providing an intermediate pumping chamber i6 and end disposed pumping chambers l1 and 58 respectively, and mounted in said chambers are respective rotors A, B, and C.

The chamber l6 and its rotor A are approximately twice the length of the rotors B and C and their respective chambers l1 and Hi, all of said rotors being keyed to a horizontally disposed drive shaft l9 which is eccentrically mounted in the housing 5 in end bearings 20, one of which is mounted in respective end walls H and I2 and said shaft being located in anopening 2| of respective chamber dividing walls It and I5.

Since the rotors A, B, and C are alike in construction excepting their lengths only the rotor A is here described in detail, said rotor comprising a member 22 which is keyed at 23 to the shaft l9 and having three equally spaced radially extending arms 24 and between each pair of arms is a pocket 25 which is formed for the working reception of respective rollers D, E, and F,

Each of the rollers D, E, and F are connected to a pair of end disposed links 26 on bearings 21,

each pair of links being swingingly mounted from respective arms 24 of the member 22.

The manner of swingingly mounting the links 26 of the respective rollers D, E, and F, is best shown in Fig. 4 and comprises a pair of bearings 28, each of which is mounted in a respective end of a horizontally disposed bore 29 formed in each of the arms 24 and secured to each bearing is one end of a sleeve 30 of a pair of alined sleeves, each sleeve on its outer end being forceably secured on a hub 3| of a respective link of each pair of links 26 and are held in alinement by an idle shaft 32 on which they are turnably mounted.

Mounted over each alined pair of sleeves 30 and intermediately fixed to a pin 33, is a torsion coil spring 34 having each of its free ends 35 engaging a pin 36 on respective sleeves 30, each pin 33 being secured in respective arms 24 and projected into respective bores 29.

Each arm 24 of the member 22 is recessed at 3'I, on each end to provide operating space for each link 26 between said member 22 and respective walls I4 and [5, each link having a Micarta packing layer 38 secured on its outer surface by rivets 39 for sealing cooperation with said walls.

For resiliently yieldable contact with the periphery of respective rollers D, E, and F is a Mlcarta packing strap 40 extending the length of each roller and each packing strap 40 being supported from respective arms 24 of the member 22 by a leaf spring 4i.

Previous to mounting the rotors A, B, and C in the housing 5, said rotors are first secured on the shaft I9 and in which rotor A may be first mounted in position on the shaft and secured thereto by the key 23 and the wall I4 slid on the shaft against one end of the rotor A and after which the rotor B is positioned on the shaft and se-.

cured thereto by the key 42. Subsequently the wall I! is slid on the shaft I; against the other end of the rotor and the roton C is then positioned on the shaft and secured thereto by the key 43.

The shaft I9 with the rotors A, B and C keyed thereto and the interposed walls I4 and I is then mounted in the open end of the housing 5 with one end of the shaft engaged in the bearing 20 of the wall I2 of the housing and the rotor C against said wall. Th dowel pins I3 are then engaged in cooperating holes in the housing wall and the peripheries of respective walls I4 and I5 and the end wall I I is secured in closing rela-v tion with the housing with the end 44 of the shaft I9 mounted in the bearing 20 of the wall II. A driven pulley (not shown) is securely fixed to the shaft I9 adjacent th wall I2 of the housing.

In the operation of this improved positive displacement pump, the shaft I9 and rotors thereon is revolved in the direction of the arrow 45 shown in Figs. 1 and 2 and the rollers D, E, and F thereon will be caused to alternately communicate with and pass the inlet and discharge ports 8 and I respectively.

By reason of the rotors A, B, and 0 being disposed eccentrically in the housing 5, the rollers D, E, and F of respective rotors will in turn be caused to travel faster as they pass and leave the inlet port 8, and to travel slower as they approach and pass the discharge port I and centrifugal action" will hold the rollers outwardly and against the inner peripheries Iii of the housing 5.

In the event the rotors are not revolved with suflicient speed at starting to create sufiicient centrlfugal action to hold the rollers outwardly and to contact with the inner periphery III of ,the housing, sufflcient outward action or movement will be given to the end disposed links 26 of respective rollers by the torsion spring 34 of respective pairs of roller links. This outward thrusting action of the springs 34 will hold the rollers in travel against the inner periphery In of the housing during slow revolving of the rotors.

travel speed, the air capacity in the section 41 is being compressed between the rollers D and E. Between the rollers E, and F, the pumping section 48 is being greatly reduced by reason of the roller E deminishing the gap between it and the roller F thereby forcing th air from section 48 through the discharge port I.

Each pocket 25 of respective rollers D, E and F are obviously for the purpose of allowing displacement of the rollers in order to decrease the size of respective pumping sections as they approach and pass the discharge port I.

Stated in another way with respect to the operation of this improved blower, when the rotors are revolved in the direction of the arrow 45, the rollers thereof will be traveled from the positions D, E, and F shown in Fig. 1 to the positions D. E, and F as shown in Fig. 2, while the shaft I9 was turned 30 degrees of rotation. Simultaneous with this 30 degree angular movement of the shaft I9 of the rotor A in the intermediate or center chamber I6, the rollers in the end chambers I1 and I8 will move to positions DI, E I, and Fl shown in dotted lines in Fig. 2, and it will be obvious that respective masses of the rollers of the center chamber IE will counterbalance themasses of the rollers in" the end chambers I 'I"and I8.

' For further illustration, the mass of the roller DI in the center chamber is approaching a maximum velocity as masses DI of the end chambers have passed the position of maximum velocity, and in this manner it will be found that the masses ofall the rollers in the center chamber in general, compensate the mass velocity of the rollers in the end chambers.

In. the same way the volumetric suction and delivery of the rollers operating in the center chamber in general, compensate for the volumetric delivery and suction of the rollers in the end chambers because at the instant that the volumetric displacement in the housing between rollers E and F of Fig. l is demlnishing, the displacement of the volumetric displacement of the rollers DI and EI of end chambers is greatest. Since the instantaneous delivery from the blower is taken simultaneously from both the center and end chambers, in which the rollers are carried by the arms 24, displaced 60 degrees from alinement, a net result will be an approximate continuous intake to the blower and an approxifunctioning in pairs wherein between each functioning roller pair, pumping sections are formed. For illustration and with respect to Fig. 1, it is noted that the roller D is passing the inlet port 8 wherein a pumping section 46 is formed or disposed between the rollers D and F and the roller D widening the gap or pumping section 46 between it and the roller F, the roller, D while moving away from the roller F causing suction to occur in the section 46. Between the rollers D and E a pumping section 41 is formed which has been capacity filled and as the roller E is slowing in its travel against the inner periphery I II of, the housingand the roller D is increasing in mate pulseless delivery from the discharge port of the blower.

The packing layer 38 on the outer surface of each link 26 andthe roller engaging packing strips 40, will minimize the escape or by pass of compressed air or fluid between the pumping sec- .tions 46, 41, and 48.

Roller vanes of this specifically formed structure provide forthe use of linkage that will resuit in decreasing the are between adjacent rollers at the discharging section as shown at 48 in Fig. 2, thus resulting in a consequent min mum entrainment of discharge fluid between pairs of rollers travel ng through the section 48 to the suction side of the pump.

Having thus described my invention so that those skilled in the art will be able to practice the same, what I desire to secure by Letters Patent is defined in what is claimed, it be ng understood that various changes in the d splacement pump shown and described above in de tail. and not amounting to invention. may be made without departing from the'spirit and scope of my invention.

\ I What I claim is; 1. A pump comprising a housing divided into a plurality of chambers, an inlet port and charge port for each chamber, and an eccentrically disposed rotor-E in each chamber and each having a series of rdllers thereon in rolling contact with the inner Q riphery of the housing, said rollers rearward of their travelling direction being swingingly connected to respective rotors, the rollers of one of said rotors being disposed to pass said ports in advancegof the rollers of said other rotors. R

2. A pump comprising a cylindrical housing having a plurality of c ambers, an inlet port and a discharge port for each chamber, a horizontal drive shaft longitudinally and eccentrically disposed through said chambers, a rotor concentrically fixed on said shaft in each chamber, and swingably mounted roller vanes on each rotor for cooperation with said ports, one of said rotors being angularly staggered on said shaft with respect to the other rotors, each rotor having a adis-,

plurality of pockets extending the width thereof and of the approxin'iate size of the roller vanes, for the reception of} respective roller vanes.

3. A pump comprising a housing having an inlet port and a discharge port, and a rotor eccentrically disposed "in the housing comprising a member havinga series of equally spaced roller vanes thereon which are swingably mounted rearwardly thereof in the travelling direction of the rotor.

4. A pump comprising a housing having an inlet port and a discharge port, a rotor eccentrically disposed in the housing comprising a member having a series of radially projecting arms, a pocket formed between each pair of arms, and roller vane swingably connected to each of said arms for cooperation with respective pockets, said pockets extending the width of the rotor and each being of a size and shape in conformity to the approximate size and shape of respective roller vanes.

5. A pump comprising 'a housing having an inlet port and a discharge port, a rotor eccentrically disposed in the housing comprising a member having a series of radially projecting arms, a pocket disposed between each pair of arms, and a roller vane swingably connected to each of said arms for cooperation with respective pockets and the inner periphery of the housing, said pockets extending the width of the rotor and each being of a size and shape conforming to the size and shape of respective roller vanes.

6. A pump comprising a housing having an inlet port and a discharge port, a rotor eccentrically disposed in the housing comprising a member having a series of radially projecting arms, a pocket disposed between each pair of arms, a roller vane swingably connected to each of said arms for cooperation with respective pockets and the inner periphery of the housing, said pockets extending the width of the rotor and each being of the approximate same size and shape of respective roller vanes, and aresiliently yieldable packing strip cooper-able with the face of respective roller vanes.

. HERBERT J. KRATZER.

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

UNITED STATES PATENTS Number Name Date 145,617 Brear 1 Dec. 16, 1873 1,317,989 Rogers Oct. 7, 1919 1,414,028 Leiman Apr. 25, 1922 1,444,880 Martin Feb. 13, 1923 1,636,826 Morgan July 26, 1927 1,645,069 Peterson Oct. 11, 1927 FOREIGN PATENTS Number Country Date 73,715 Switzerland 1915 342,561 Great Britain Feb. 5, 1931 552,792 France Jan. 29, 1923

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