US2152498A - Rotary pump - Google Patents

Description

March 28, 1939. F. A. QUIROZ 2,152,498

ROTARY PUMP Filed Jan. 14, 1937 Patented Mar. 28, 1939 UNITED STATES Pli'llaNT oFFicE ROTARY PUMP l Francisco Angel Quiroz, Newark, N. .1. Application January 14, 193i, seal'No. 120,465

1 claim. (ci. loza-142)I small quantity of the liquid in order to maintain a good seal between the rotary members and the stationary parts at all times, and make the pump self priming.

A further object is to provide a pump which can be easily altered in order to obtain different volumetric capacities with the same size of parts and at the same rotary speed.

Other objects will be in part obvious or in part pointed out hereinafter.

'I'he invention accordingly consists in the features of construction, combinations of elements,

and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claim. i

In the accompanying drawing in which are shown a preferred form of various possible embodiments of the mechanical features of 'my in-` vention,

Fig. 1 is a central vertical sectional view of the pump with part of the shaft shown in elevation.

Fig, 2 is a cross vertical sectional view along the line'2--2 of Figure l.

Fig. 3 is a perspective view of the slotted shaft 4 with the flat member 5 heldin position by pin 8.

Fig. 4 is a perspective view of the rotary member 3 shown in section in Figures 1 and 2.

Similar reference characters refer to similar parts throughout the several views in the drawing.

Referring now to the drawing the apparatus comprises a main casing i which is provided with a chamber 1 where the rotary members operate, an inlet port 8, an outlet port 9, a bearing housing I0, legs II and I2 and tap holes I3, for the bolts that secure the cover 2 in its place.

'I'he cover 2 is provided with a bearing housing I5, which is concentric with the bearing housing I and supports the other end of the shaft 4. A cover I5n keeps the bearing in position and prevents the leaking of any fluid going through the bearing I8; said cover I5* is held in position by bolts I1. Another cover I8 serves the same purpose as the cover I5, but it is provided with a stuffing box i9, and a gland 20, to allow the driving end of the shaft 4 to go through.

The shaft 4 is provided with a slot 2| which is 5 practically of the same width as the at member 5, at the center where said member 5'is pinned to said shaft, but said slot widens out at both ends to allow the flat member 5 to oscillate back and forth as the shaft 4 is' rotated. member 5 is practically a rectangular member with one of the narrow sides 22 slightly round making an arc with va height equal to the height of an angle made by'two lines having an inclination equal in degrees as the oblique end ofthe casing has to the perpendicular end of the same, and a base equal to the width of the propeller member, 5. 'Io conform with this round face of the flat member 5, the face 23 of the slot is also 20 -round in the same proportion, in order to prevent any leakage of the fluid from one side to the other, while the member 5 oscillates. The ends of the flat member 5 are slightly curved making an arc with a radius having the 25 center at the center of the pin 6 as the starting point.

'Ihe rotary member or rotor 3 is a circular disc with one straight face 25 and one conical face 26 of approximately the same diameter as the 30 circular chamber 1 to have a slide fit therein, and has a hub 24 extending from the straight face 'I'he conical face 23s has the same angle as the inner face 26 of part 2, and when in place, fills entirely the space of the upper part of chamber 1. An axial hole 21 runs across the hub 24 and the center of the disc 3. A slot 30 runs diametrically across the conical disc 3 and the hole 21, leaving only two steps 28 and 29, which serve as astop for the flat member 5 as shown in Fig- 40 ure l.

The conical disc 3 is firmly secured to the shaft 4, preferably by a pin 3|, practically making the disc an integral part of the shaft 4.

It can be clearly seen that the flat surface of the disc 3, fits closely to the ribs 32 and 33. These ribs are formed in the main casing, I, and are an integral part of the same. They are slightly wider than the slot 30 in the rotor-3, in order to make a good seal, but they are not too wide to interfere with the liquid by-passed in the slot 30, which is `used to prime the pump, but there is a space as shown by dotted line 34 in Fig. l between the disc 3 and the casing I, in order to allow the duid i to get in and out of the groove 30, when the flat The flat 10 member 5 oscillates in and out of said groove 80. as it is shown at 1 in Fig. 1.

The inclined surface 26 of the cover 2 is built with the same angle of the conical surface of disc 3, and ts closely to the upper side of the disc, preventing the passage of liquid from the pressur'e side 36 to the suction side 31, but leaves an opening at the lower side, as shown in 38, which space is of the same cross sectional area as the protruding end of the fiat member 5, therefor each end of said member 5. works as a rotary piston in said space 3B, forcing the fluid that gets into said passage 38, from one side to the other, depending on the direction of rotation of the shaft 4. Another small amount of fluid is passed by the empty space of the groove 30.

As it can be clearly seen this pump is reversible, and either one of the ports 8 or 9 can be the suction or the discharge port.

This pump is self priming due to the fact that a small quantity of liquid is left at all times inside of `the pumps main chamber, and it is by-passed by the groove 30 from one side to the other, sealn ing the clearance between the different parts and producing a good vacuum at the suction side.

The operation oi.' this pump is the same as the 1 operation of an ordinary rotary pump of the blade type, but has the advantage cf preventing a radial thrust against the periphery of the casing, and preventing the fluid in the back of the blades from being squeezed between the parts. Another advantage is that the blades rotate at a constant speed, which is not the case with the excentric rotary radial blades.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense. y

I claim:

In a rotary pump of the character described in combination a casing having a cylindrical pump chamber therein, said chamber having a perpendicular wall at one end thereof, a wall extending obliquely to the chamber axis at the other end thereof, and a cylindrical wall joining said end walls, said perpendicular wall being provided with a diametrical raised portion extending into the chamber and forming a rib, a fluid vinlet port in the cylindricalwall of the chamber extending from one end and side of said rib, a fluid outlet port in the cylindrical wall of the chamber extending from the same end but opposite side of said rib and in the opposite direction from said inlet port, said perpendicular` wall and rib having a central bore extending therethrough, a shaft rotatably mounted in said bore and extending into said chamber, a rotor of the same diameter as said chamber fixedly mounted on said shaft Within said chamber, said rotor having three faces, one face perpendicular to its axis and the opposite face thereof conical, the third face thereof being cylindrical and joining said other two faces, the perpendicular rotor face being mounted in close contact along the entire rotor 'diameter with the said rib, the conical rtor face being in close contact with a radial line of the oblique end of the chamber, said rotor having a diametrical slot therein extending throughout the length of the rotor and ofa width slightly less than the width of the rib, and a fluid impelling blade of thesame width as the slot mounted in saidrotor slot to oscillate toward and from the chamber end walls, said blade being so mounted as to have constant contact at one side with the oblique end wall during rotor rotation and to provide a space in the rotor slot at the end thereof adjacent the

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