US2097714A - Rotary compressor or pump - Google Patents

Description

Nov. 2, 1937. c. M. AYRE 2,097,714

ROTARY COMPRESSOR OR PUMP Filed Feb. 12, 193"! 2 Sheets-Sheet 1 M Y i 1937. c. M. AYRE 2,097,714

ROTARY COMPRESSOR OR PUMP Filed Feb; 12, 1957 2 Sheets-Sheet 2 'Fatenteoi Nov. 2, i937 My invention relates to a rotary type pump or compressor. Primarily intended for use in electric refrigerators, but may be used for whatever other purpose a pump of this type is adaptable.

This compressor is so designed it may be used in either a vertical or horizontal position, and i be either belt or direct driven or hermetically sealed.

It differs from prior types in that it has a rotary disk or .web with vanes or blades worklng in a stationary groove.

The object of my invention is a compressor with few moving parts, the prior types are sub- .ject to vanes sticking in the open position, interfering with operation. I have designed a positive action self-closing blade which will eliminate this fault, a small compressor with a large volume of displacement.

I attain these objects through mechanism illustrated and described in the accompanying drawings and specification.

\ Figure 1 is a vertical section of the entire compressor.

Figure 2 is a section on line 2-2 of Figure 1 showing side view of blade and cam.

. Figure 3 is a section on line 9-3 of Figure 1 showing a section of the rotary seal.

Figures 4 and 5 are side elevations with parts of housing removed showing internal parts. a

' Similar numerals refer to similar parts throughout the several views; G refers to ground joints wherever used.

The disk or web 8 is keyedito shaft I as shown at I! and rotates with shaft I in journals I6-I6 in direction indicated by arrow in Figure 2, end thrust being controlled by a thrust hearing assembly comprising the ball 2i and spring 22. The disk 9 is held against the housing 24 by spring 9 which bears against the roller hearing I, contact between disk 9 and housing 25 being a ground joint as indicated by G.

The disk 9 holds two or more blades or vanes 9 (according to size of pump), which act as pistons sliding in a grooved cylinder 39, blades 9 are held down in the cylinder groove 39 by springs I9 which are secured to disk 8 by screws I3.

The blade 9 rotating up over stationary cam, (or divider block, see Fig. 2) in cylinder 39, passes over intake port i4-drawing in gas, or air through port I4, by suction as it continues around the cylinder 99. At the same time air or gas is forced through exhaust passage I2 and through exhaust valve II by the blade 9 following as it rotates, causing pressure to be built up inside of FATENT @FFICE ROTARY EDMPRIESSOR R PUMP Calvin TM. Ayre, Arlington, Va. Application February 12, 1937, Serial No. 125,378

Claims. (Cl. 103-141) housings 24, 26. This pressure is then led ofi through pipe connection I5 to line.

Leakage of air or gas around shaft I is sealed by seal nose assembly 2-3, which is held tight against journal I6 by spring 5. Packing 23 is held by washer 21 and spring 4 to further seal against leakage. This complete assembly comprising seal nose 2 and 3, packing 23, washer 21 and springs 4 and 5 is made to rotate with shaft I by key I1 and pins I8. The key I1 must fit l0 tight in the shaft I but a sliding fit in seal nose 2 is required.

Leakage at other end of shaft I is sealed by packing 23 and plate 29 held by bolts I3. Leakage between housings 24 j and 26 is sealed by flange joint and packing 23; 24 and 26 are held together by bolts I3.

The blade 9 pivots at its middle point on pivot pin 25 which passes through disk 8. The front end of blade is forced to return to the bottom of cylinder 39 after passing over the divider block 24a (Fig. 2) by the rear end of blade 9 coming up the opposite rise; this prevents blade 9 from sticking in the open position, gives quieter operation and reduces the strain on spring I9.

Throughout the inner surface of the housing 24 there is a continuous cam and groove 39.

Due to this arrangement of the cam and groove and blade 9 it is impossible for the blade 9 to stick. A sticking blade is one of the main difli- 30 culties with most of the rotary compressors now on the market.

Blade 9 is so arranged that the pressure of the gas compressed against the forward end of blade causes it to be forced down in cylinder groove 39, thus relieving the pressure on spring I9.

Blade 9 is segmentary in shape, inner and outer radii being the same as and concentric with the outer and inner radii of the cylinder groove 39 on its one view, the'other View being \i-shaped so as 40 to ride over the cam in 39.

I claiml. A compressor of the class described comprising a housing formed of two bell-shaped memhers bolted and sealed together, with intake and discharge ports therein, a continuous annular groove on the inner side of the end wall of one housing member forming a working chamber, one segment of said groove being formed as and providing a cam having opposite inclines and forming a cut-off or divider block between the intake and discharge ports, a shaft journaled in the housing, a disk keyedto the shaft for rotation therewith and having a gas-tight contact with the grooved housing member, means for maintaining said contact between the disk and the grooved housing member, pockets in the outer rim of the disk opening into said working chamber, piston blades pivoted at their central point within said pockets for sliding in said annular groove working chamber and over said cam in the housing member, said blades being made in the shape of a segment cut from a sphere by two arcs concentric with an axis of the sphere and passing through the sphere as their centers slide along said' axis, said blades being pivoted in said pockets of the disk in such a manner as to ride partly within the disk pockets while rotating in the plane of the disk.

2. The compressor as set out in claim 1 in which springs are provided for maintaining contact between the blades and the bottom of the annular groove, and said piston blades are V- .shaped on the side facing the groove so that when the blades pass over the cam or divider block the rear ends of the blades ride on the first incline of the cam in order of motion, forcing the forward ends of the blades down on the other incline of the cam onto the bottom of the annular groove as the blades slide in the groove whereby the blades are positively operated about their pivots in passing over the cam preventing the blades from sticking in any position, contact between the bottom of the annular groove and the blades being maintained by said springs'during the remainder of their path of travel, the travel of the blades in the annular groove and over the cam causing air or gas to be drawn in through the intake port and expelled out through the discharge port after compression.

3. A compressor as set out in claim 1 in which the forward end of the blade is undercut so that the pressure of the gas compressed assists in the holding of the blade in the bottom of the annular groove.

4. A compressor as set out in claim 1 in which the means for maintaining said gas-tight contact of the disk comprises a coil spring surrounding the shaft rotatably mounted and seated at one end against the disk, and at the other end against a roller bearing mounted on an annular flange on the inner face of the other housing member.

5. A compressor as set out in claim 1 in which a spring is provided for maintaining contact between the forward end of each blade and the bottom of the annular groove, said spring being secured between the wall of the pocket opposite the annular groove and the back of the forward end of the blade in the direction of travel, and in which the blades are V-shaped on that side facing the annular groove, whereby the opposite inclines of the cam cooperate with the V-shaped blades to positively pivot them about their central points as they pass over the cam.

CALVIN M. AYRE.

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