US1237273A - Rotary pump. - Google Patents

Description

A. N. BAADEK HOIARX PUMP. APPLICATION FILED MAY 17. 1916.

1,237,273.- v Patented Aug. 21,1917.

3 SHEETSSHEET I.

ammo a @131 V I I flbtomwi A. N. BAADE.

ROTARY PUME. APPLICAHON FILED MAY 17. 1916.

1,237,273. Patented 21,1917.

3 SH -SHEET 2- ANDREW N. BAADE OF SAN ANSELMO CALIFORNIAQ I ROTARY PUMP.

Specification of Letters Patent.

Patented Aug. 21, 1917.

Application filed May 17, 1916. Serial No. 98,200.

17 '0 all whom it may concern:

Be it known that 1, ANDREW N. BAADE, a citizen of the United States, residing at San Anselmo, in the county of Marin and State of California, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

This invention relates to rotary pumps of the general type disclosed in Patents No. 1,050,905, granted to me Jan. 1, 1913, and No.1,112,515, granted to me Oct. 6, 1914, the primary object of the present invention being to provide arotary pump which may be disposed in a horizontal position and rotated in either'direction. A secondary object of the invention is to reduce the number of parts and thereby lessen the cost. ofproduction'ahd also increase the ease of operation.

A rotary pump embodying my invention is illustrated in the accompanying drawings and the irwention resides in certain novel features which will be hereinafter first fully described and then more particularly pointed out in the claims following the description.

In the drawings:

Figure 1 is a longitudinal-section of a rotary pump embodying my present improvements;

Fig. 2 is a transverse section of the same;

Fig. 3 is a perspective view of the stationary eccentric shaft and the blades mounted to rotate about the same with the connecting parts;

Fig. 4 is a transverse section showing another form of the invention.

In carrying out my present improvemcnts, I provide a horizontally disposed oylinder 1 having its ends closed'by heads 2 and having a piston 3 mounted to rotate therein. Upon one of the heads 2 1s cast or rigidly secured a yoke 4 through which the driving shaft 5 extends and upon the said head, at the center thereof, is formed a boss 6 constructed to accommodate an extension 7 upon the adjacent end of the piston and also receive packing 8 which is compressed by a gland 9. In the outer end of the yoke 4 is fitted an anti-friction bearing 10 which is covered and held in place by a cap 11 and .in the central shaft openings through the said cap and the end of the yoke are secured felt washers 12 whereby lubricant supplied to the bearing 10 will be retained around the same. The driving shaft 5 may be connected with a motor (not shown) in any convenient or preferred manner and its inner end is provided with a threaded enlargement 13 which engages the projection 7 of the piston so that the rotation of the driving shaft will be transmitted to the piston. While this threaded connection is efficient and is preferred,'by reason of its simplicity, it is to be understood that other means of connecting the driving shaft to the piston may be employed Without involving any departure from the invention. That end of the piston provided with the extension 7 is also provided on its inner face at its axial center with a recess 14 in which is seated a trunnion 15 on the eccentric shaft 16. The

opposite end of the said eccentric shaft is provided with an elongated trunnion 17 terminating in an angular portion 18 which engages an angular recess in a cap or plate 19 secured to the adjacent head of the cylinder. The said head of the cylinder is provided with a projection or elongation 20 so as to provide an extended bearing for the trunnion 17 and the cooperating end of the piston is constructed with a similar projection 21 fitting in the said extension 20 to rotate about the said trunnion. To reduce thefrictional wear between the parts Babbitt metal 22-is inserted through the projection 21 and around trunnion 17 and also employed to line the recess 14 as shown at 23.

The eccentric shaft and its trunnions are I provided with an axial passage, indicated by dotted lines at 24, from which lateral open-' the cylinder 1 and a sleeve 27 secured to and extending between the cylindrical end plates and provided with longitudinal slots or grooves 28 to accommodate the blades 29.

The sleeve 27 is a so provided with radial openings or passages to accommodate the arms 30 which carry the blades 29 and the inner ends of these arms are pivotally attached to the rings 31 fitted upon the eccentric shaft 16 adjacent the ends thereof. It will be readily noted that the said rings 31 are provided in two series, one series at each end of the shaft and the rings in eachseries being equal in number to the blade-carrying arms 30. Each ring is provided with a lateral lug 32 and the inner end of each arm 30 is provided with'a reduced extension or ear 33, pivot rods 34 being inserted through the registering lugs 32 and 33 so as to pivotally connect each arm to one of the rings. It will also be noted that the pivot rods 34 are approximately equal in length to the length of the piston sleeve 27 and each rod, therefore, serves as a pivotal connection between two arms and the rings to carry the same. The coiiperating lugs 32 and 33 are of such dimensions-that by suitably arrang- Y may be all brought into the same radial ing the rings to cause some of the lugs tobe' reversed relative to the other lugs, the arms plane cf the piston and, consequently, the several blades will be supported at equal distances from their ends and warping or bending of the blades will be counteracted so that the wear upon the same will be uniform throughout the travel. A spacing collar 35 is fitted upon the eccentric shaft 16 between the inner ends of the two series of rings 31 so as to hold the rings in their proper positions and bushings 36 of Babbitt metal are interposed between the eccentric shaft and the rings, as clearly shown. The cylinderl is provided at diametrically opposite points.

inder, at the top of the same and midway between the two ports, is a longitudinally extending abutment 40 while upon the oppo site side of the cylinder and extending between the ports is a wear plate 41 which is secured in place by bolts inserted though the wear p ate and the cylinder from the inner surface of-the wear plate and having their'heads countersunk so as to lie flush with the concave surface of the'wear plate.

By referring particularly to Fi 2, it willbe noted that the eccentric sha 16 is disposed-so that its surface, nearer the inner surface of the cylinder, w1ll be projected toward that side of the cylinder to which the wear plate is secured and it will furtherbe readily-understood that as the piston is rotated, the blades will be retracted as they approach the abutment and will be projected as they approach'the wear plate so that they will be in contact with the wear plate throughout their travel over the same and will, consequently, form suction chambers in connection with the same to draw in the water and cause it to travel through the cylinder and out through the outlet port.

It is thought the operation will be readily naeaara 5 understood. Motion is imparted to the piston through the driving shaft and the piston thereby rotated past the abutment 40 and over the wear plate 41. As each pair of arms 30 approach the abutment, the rings carrying said arms will bein such osition that the arms will be retracted re ative to the piston and, consequently, will ride past the abutment which serves as a stop for the water and prevents the ressure of the same choking the piston and interfering with the successful operation of the pump. The eccentric shaft is held stationary by the engagement of its angular extremity 18 with the cap 19 and, consequently, as the arms and blades are rotated about the shaft with the piston, the rings 31 will also be caused to travel about the eccentric shaft so that the arms will be giyen a radial sliding movement relativeto the piston and will be projected toward the wear plate as they approach the same. Inasmuch as the supports for each pair of the arms completely encircle the eccentric shaft, the arms will move steadily and evenly during the entire operation of the pump and the water will, consequently, be drawn into and expelled from the pump in a steady active stream. The provision of these-"blade rings, which completely encircle the eccentric shaft, eliminates or overcomes the necessity for guides or retainers to support the parts to which the blade-carrying arms are connected and thereby reduces the cost of manufacture and also makes the operation of the pump smooth and easy. By having the arms at opposite ends of each blade mounted upon a common pivot rod, the tendency of the blade to bend under the pressure of the water is overcome and the blade is held at a uniform distance from the throughout its entire course of travel. The

parts are readily accessible for the purpose I of cleaning, renewin or repairing the same and the apparatus wi loccupy but very little space when in use.

In Fig. 4, I have shown the cylinder 42 as provided with'ports 43 at diametrically opposite points and each of these ports opens into a conduit .44 extending to opposite sides of the structure. Either of these conduits may be an inlet so that the pump may be operated'in either direction and it will be readily noted that it may. be operated to draw in water from either or both sides of the conduit and also discharge at either or both sides thereof, thereby being especiallyadapted for use upon fire engines.- In this 1 posed to the wear plate is concentric with the said plate throughout its extent and, consequently, the blades will not move radially of the piston at any period of their travel over the wear plate so that the suction chambers formed between the two successive blades, the wear plate and the piston will not vary in capacity and the pressure exerted upon the water will be uniform. It will also be noted that the arms 50 will move quickly from their inner to their outer positions so that, when the blades are acting upon the water, the arms carrying the blades will not be subjected to frictional resistance by the piston and, consequently, the pump will operate very easily and back pressure of the water upon the blades will be effectually counteracted. In this form of the invention a guide ring 51 is secured upon the eccentric shaft 48 and the inner ends of the several arms 50 are equipped with rollers 52 to ride upon the surfaces of the eccentric shaft and the said ring and thereby minimize the frictional resistance. The wear plate in the present instance is concentric with the opposed surface of the piston so as to preserve the uniform dimensions and shape of the suction chambers formed by said plate, the piston and the two successive blades.

Having thus described the invention, what is claimed as new is:

1". In a rotary pump, the combination'of a horizontally disposed cylinder having diametrically opposed ports, a piston disposed within the cylinder and journaled at its ends in the heads of the cylinder, an abutment secured within the cylinder and extending the full length of the same midway between said ports, a wear plate secured in the cylinder diametrically opposite the abutment and extending between and terminating at the ports, a stationary eccentric shaft extending through the piston and having a portion of its surface concentric with the said wear plate, blades carried by the piston, and means on-.the eccentric shaft for projecting the blades as they approach the wear plate and retracting the same as they approach the abutment.

2. In a rotary pump, the combination of a cylinder, a piston mounted concentrically therein, an abutment secured within the cylinder and extending to the piston, a wear plate disposed diametrically opposite the abutment, the cylinder being provided with ports between the abutment and the wear 1 plate, an eccentric shaft held against ro- 'tation by the cylinder and disposed within the piston, blade rings loosely encircling the eccentric shaft, blade-supporting arms pivoted to the respective blade rings, and blades carried by the outer ends of said arms to move over the wear plate.

3. In a rotary pump, the combination of a horizontally disposed cylinder having oppositely disposed ports, an abutment within the cylinder between the ports, a concentric piston mounted to rotate within the cylinder, an eccentric shaft secured in the cylinder and disposed within the piston, blades I carried by the piston, and means on the eccentric shaft acting, on the blades during rotation of the piston whereby the blades will be retracted as they approach the abutment and projected toward the cylinder at the side oppositethe abutment.

4. In a rotary pump, the combination of a cylinder, a concentric piston mounted to rotate therein, an eccentric shaft within the piston held against rotation, a plurality of rings loosely encircling said shaft within the piston, blade-carrying arms pivoted to the respective rings and extending radially through the piston, and blades carried by the outer ends of said arms.

5. In a rotary pump, the combinatlon of a cylinder, a concentric piston mounted to rotate therein, an eccentric shaft secured in the cylinder and held against rotation thereby and disposed within the piston,

series of blade rings loosely encircling said.

the eccentric shaft at each end thereof,

means between the two series of blade rings to separate said series, blade-carrying arms mounted radially in the piston at the ends 'of the same, pivot rods each passing through longitudinally alined blade-carrying arms at the ends of the piston and connecting said arms to the adjacent blade rings, and blades carried by said arms.

7. In a rotary pump, the combination of a stationary cylinder, a concentric piston mounted to rotate therein, an eccentric shaft secured in thecylinder and disposed within the piston, bushings disposed about said shaft between the same and the ends of the piston, blade rings mounted upon'said between said shaft and said rings, bladecarrying arms pivoted to said rings and extending radially through the piston, and blades carried by said arms v 8. In a rotary pump, the combination of a stationary cylinder, a piston mounted to rotate therein,- an eccentric shaft secured in the cylinder and held against rotation thereby and disposed Within the piston, a series of blade rings loosely encircling the eccentric shaft at each end thereof, bladecarrying arms mounted radially in the piston at the ends of the same, pivot rods each passing through the longitudinally alined blade-carrying arms at the ends of the piston and connecting said arms to the adjacent blade rings, and blades carried by said arms,

mamas I 9. In a rotary pump, the combination of a stationary cylinder having recessed portions at its ends, a concentric piston disposed Within the cylinder and having through the piston, and blades carried by the outer ends of said arms'and adapted tobe housed Within the piston or projected therefrom as the piston rotates about the eccentric shaft.

In testimony whereof I afix my signature;

ANDREW N. BAADE. [1 s.]

Images