US2655309A - Dual rotor compressor - Google Patents

Description

Och 1953 s. G. HOUSE ET AL 2,655,309

DUAL ROTOR COMPRESSOR Filed May 1, 1950 2 Sheets-Sheet 1 /5 --5 3 INVENTORS S. 6-. Ease 0. K11 l'Z-s BY 'Q M.

ATTORNEYS 06L 1953 s. G. HOUSE ET AL DUAL ROTOR COMPRESSOR 2 SheetsSheet 2 Filed May 1, 1950 INVENTORS ATI'ORNEY5 Patented Oct. 13, 1953 DUAL ROTOR COMPRESSOR Samuel G. House and Oscar K. Hobbs, Abilene, Tex., asslgnors to J. F. Nevins, Annie Mae Glenn and Christine Glenn Teague, Abilene,

Tex., as trustees Application May 1, 1950, Serial No. 159,324

2 Claims. (01. 230-441) This invention relates to rotary compressors.

An object of this invention is to provide a rotary compressor which is designed particularly for use in refrigerant systems for compressing the refrigerant gas and providing the necessary circulation of the gas through the system.

Another object of this invention is to provide an improved compressor which includes a pair of rotors disposed in a pair of cylinders with each rotor having a spring pressed piston in contact with the cylinder wall. A suction port is provided at a point below the contacting surfaces of the rotors, and an exhaust port is provided above and laterally of the contact surfaces of the rotors with the exhaust port normally closed or covered by one of the rotors for the major portion of the rotation thereof so that the gases will be compressed to a maximum degree before the exhaust port is opened.

A further object of this invention is to provide a compressor wherein intake and exhaust valves have been eliminated.

With the above and other objects in view, our invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a plan view partly broken away and in section of a compressor constructed according to an embodiment of this invention.

Figure 2 is a sectional view taken on the line 22 of Figure 1.

Figure 3 is a sectional view taken on the line 3-3 of Figure 2.

Figure 4 is a fragmentary inner side elevation of the rotors showing the latter on the beginning of the suction cycle.

Figure 5 is a fragmentary sectional view taken on the line 5-5 of Figure 2.

Figure 6 is a fragmentary sectional view taken on the line 6-6 of Figure 2.

Figure 7 is a fragmentary sectional view taken on the line I-I of Figure 4.

Referring to the drawings, the numeral I designates generally a compressor housing which is formed of cylinder end walls II and I2 and an intermediate cylinder wall I3 which is formed with a pair of communicating cylinders III and I5. The cylinders I4 and I communicate at their inner portions with each other. A gear housing I6 is carried by the housing II] projecting from the wall I2 thereof, and a pair of spur gears I! and I8 are mounted on shafts I9 and 20, respectively.

The shaft 20 projects through a packing gland 21 and constitutes the drive shaft for the rotors. A pair of cylindrical rotors 22 and 23 are disposed in the cylinders III and I5, respectively, and have a diameter substantially less than the diameter of the associated cylinder thereby providing annular gas chambers 24 and 25 which. communicate with each other at the inner sides of the cylinders I4 and I5. The two rotors 22 and 23 are disposed in contacting relation at their inner portions as indicated at 26, and this contacting point forms a dividing wall which divides a suction port 2? from an exhaust port 28. The suction port 21 is open at all times except as will be hereinafter described so that gas may be freely drawn into the chambers 24 and 25.

The exhaust port 28 confronts one side of rotor 23 and is normally closed during the major portion of the rotary movement of rotor 23. The rotors 22 and 23 have slidable therein radially disposed pistons 29 and 30 which are normally held in contact with the wall of the associated cylinder by means of a bowed spring 3I disposed in a recess 32 formed in the inner end of the piston. Each piston is formed with a pair of oppositely extending flanges 33 engaging in a cutout 34 formed in the associated rotor so as to thereby limit the outward movement of the piston when the piston is out of contact with the cylinder wall at the two points where the cylinders are in communication with each other. Each cylinder is formed with a pair of upwardly convergent flat surfaces 35 at a point below the suction port 21 so that the piston when disposed at its outermost position will ride downwardly and inwardly on the flat or game surface 35 to thereby prevent any knocking. The rotor 23 is formed with a cutout 36 on the leading side of the piston 30, and rotor 22 is formed with a cutout 31 on the trailing side of the piston 29. Piston 29 is adapted to engage in the cutout 36, and piston 30 is adapted to engage in the cutout 31 when the two pistons are moving downwardly from the exhaust or pressure zone to the suction zone.

In the use and operation of this compressor the intake port 2'! is adapted to be connected to a source of gas supply, and the exhaust port 28 is adapted to be connected to a refrigerant system on the pressure side of such system. The drive shaft 20 is connected to a power member, and upon rotation of shaft 20 the two rotors 22 and 23 will rotate in the direction indicated by the arrows in Figure 2. The leading sides of the pistons 29 and 30 constitute the positive pressure side; whereas, the trailing sides of these pistons constitute the negative or suction side. After the pistons 29 and 30 pass the suction port 21 the gas in the chambers 24 and 25 will be compressed to a relatively high degree until the cutout 36 of rotor 23 is in substantial registry with exhaust port 28. The gas in both chambers 24 and 25 will be forced outwardly through the exhaust port 28 until the piston 30 passes the exhaust port, and the two pistons 29 and 30 move downwardly into the suction zone.

What is claimed is:

1. A valveless compressor comprising a housing formed with a pair of side-by-side cylinders having open inner sides and communicating at their sides with each other and having closed end walls, a rotor rotatably mounted in each cylinder between the end walls, said rotors being peripherally contacting and having a diameter substantially less than the diameter of the cylinders to provide an annular chamber about each rotor, each of said rotors having a smooth peripheral surface and being formed with a radially disposed slot opening through the periphery thereof, a piston slidably mounted axially in the slots and radially projecting from the periphery of the rotors, spring means biasing said pistons outwardly from the rotors into sweeping contact with the internal walls of the cylinders, means carried by the pistons and rotors limiting the outward movement of the pistons, each of said rotors having a 1 peripheral cut-out adjacent its piston, the cutout of one rotor being forward of its associated piston and the cut-out of the other rotor being located rearwardly of its associated piston relative to the direction of rotation of the rotors so that the pistons engage in the cut-outs as the rotors are rotated, said housing having an intake port opening through one end wall and constantly communicating with said chambers at one side of the point of contact of said rotors and said one end wall having an exhaust port at the other side of the point of contact of said rotors, one of the rotors lying over the exhaust port so as to close off the latter from communication with the chambers during a major portion of the cycle of rotation of said one rotor, the cut-out of said one rotor being in registry with said exhaust port during the remaining portion of the cycle of rotation of said one rotor to establish communication between the exhaust port and the chambers.

2. A valveless compressor as claimed in claim 1, wherein said slots in the rotors have enlarged inner ends and said means limiting the outward movement of. the pistons includes feet on the pistons disposed in said enlargements, the depth of said enlargements being greater than the thickness of the feet to: give the pistons a limited radial movement.

SAMUEL G. HOUSE. OSCAR K. HOBBS.

References Cited in the file of this patent UNITED STATES PATENTS" Number Name Date 89,269 Andrew Apr, 27, 1869 165,805 Disston July 20, 1875 310,053 Harrington Dec. 30, 1884 363,739 Frost May. 24, 1887 883,894 Knowles Apr. 7., 1908 1,294,869 Bump Feb. 18, 191.9 1,407,496 Storey Feb. 21, 1922 1,424,312 Leonard -1 Aug. 1, 1922 2,058,817 Northey Oct. 27,, 1936 2,266,820 Smith Dec. 23, 1941 2,460,310 Rathman 1 Feb. 1, 1949 2,487,721 Minshall Nov.- 8, 1949 2,504,230 Smith Apr. 18, 1950 2,511,878 Rathman June 20, 1950 2,578,196 Montelius Dec. 11, 1951 FOREIGN PATENTS Number Country Date 316,670 Great. Britain-Complete not accepted, printed in 1931..

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