US1799539A - Rotary compressor - Google Patents

Description

April 1931. 5. SMITH 1,799,539

ROTARY COMPRESSOR Filed April 2. 1929 2 Sheets-Sheet 2 INVEUVFOR SIDNEY SMITH NTTQRNEY$ Patented A r, 1, 1931' UNITED STATES PATENT OFFICE smn'iir smrn, or wnsr VANCOUVER, nnrrrsrr conmanIA, cAivAnA, 'A'ssreno'zz To a. r. murAc'runnns Lmrrnn, or vAncouvnn, BRITISH commnrA, cANAnA ROTARY COMPRESSOR Application fled April 8, 1929, Serial 110. 851,998, and. in Canada November 2i, 1928;

My invention relates to improvements in rotary compressors which are particularly adapted for compressing gases such as methyl chloride, butine and the like. The objects from the compressor, 30 that the said fluid a or gas, carried through to the condenser or other apparatus, is free fromv finely divided lubricant, thus relieving the said apparatus of work which it is not designed to do.

The invention consists essentially of a rotary compressor having a casing partially surrounded by an oil separating chamber, and a duct between the separator and the casing whereby the pressure developed by the compressor is adapted to deliver oil therefrom to the working parts within the said casing, as will be more fully described inthe following specification, and shown in the accompanying drawings,inwhich:--

Fig. 1 is a longitudinal sectional view of the invention. 7

Fig. 2 is a transverse sectional view taken on the line 22 of Figure 1, showing the rotor in end elevation.

Fig. 3 is a part plan view taken on the line 33 of Figure 2.

Fig. 4 is a transverse sectional view taken on the line 44 of Figure 3.

In the drawings like characters of refer ence indicate corresponding parts in each figure. V

The numeral 1 indicates a standard consisting of a base or separator chamber 2 in which the oil or other-lubricant used in the compressor is collected and an open ended casing or cylinder 3. The separator chamber is fitted with an inclined baflle plate 4 adjacent a dischar e port 5.which communicates between the casing 3 and the chamber 2, and a further bafiie plate 6 adjacent an outlet port 7 which is remote from the discharge port 5, so that the gas and oil delivered into the chamber is caused to follow an irregular path in its flow to the outlet that the globules of oil may fall by gravity from the gas stream. The casing 3 is provided with an inlet port 8 approximately 120 degrees from the discharge port. The casing is fitted with a pair of heads numbered 9 and lOwhich are bolted thereto in the usual manner. The head 9 is provided with an eccentrically disposed boss 11 which is bored to accommodate a driven shaft 12 and a suitable gland13. Theinner end of the head 9 is formed with a spigot projection 14 and with an inner face 15. The

head 10 is provided also with a spigot projec-' tion numbered 16 and an inner face 17 Secured to the shaft 12 is a rotor 18 having concentric recesses 19 at both ends and having pairs of radialslots 20 which are adapted "to receive a plurality of slidable blades 21. These blades are maintained in contact with the inner periphery of the casing by spacers generally indicated by the numeral 22. The

spacers 22 consist of an elongated loop 23 whlch are each adapted to receive a spring 7 26 which abuts the end of one of the pins. Since the casing 3 is cylindrical and the rotor is eccentricall mounted therein, it will be obvious that t e distance from one peripheral wall of the casing to the other taken horizontally through the axis of the rotor will be less than the distance from wall to wall taken vertically through the said axis, so that the springs 26 must be provided to hold the outer edge of each pair of blades in sealing contact with the peripheral walls of the casing- It will also be apparent that .by forming the spacers in this manner the required sprin expansionis reduced to a minimum and t e shaft is bridged by the loops 23, thus avoiding the transverse piercing of the shaft and the consequent weakening thereof which would be requlred if straight pins were used such as are commonly employed.

' is forced by the gas pressure developed in the The outer periphery of the spigot projection 14; is provided with a groove 27 which for simplification of machining, extends therearound and directed inwardly therefrom, at a point adjacent the inlet port 8 is an oil passage 28, see Figure 3, the purpose of which will hereinafter appear. Communicating with the groove is an oil feed pipe 29,'see Figure 1, which extends downwards into the separator'chamber 2 and through which oil compressor. Immediately to the rear of each of the blades 21 a passage 30 is formed longitudinally of the rotor which is intersected by one or more radial passages 31 extending from the outer periphery of the rotor, one end of each of the passages 30 being so disposed as to register intermittently with the passage 28 in the spigot projection of the head 9, so that as the shaft 12 is rotated each passage 30 is brought into. register with the passage 28, a quantity of oil from the separator chamber is forced outwards through the passages 31 into the casing 3 to lubricate the several moving parts.

It will be noted that the several oil passages in the rotor come into register with the passage 28 only when adjacent to the intake port, so that the oil flow therethrough is assisted also by the negative pressure prevailing on the suction side of the compressor. The oil so delivered into the casing is carried therearound by the blades 21 and is ultimately discharged into the separator chamber 2' with the gas compressed where it is separated therefrom ready for reuse.

It Will thus be seen thatthe delivery of oil to the casing 3 is so regulated as to provide ample lubrication, which is increased in quantity as the compression load increases.

What I claim as my invention is 4 1. In a rotary compressor, a casing having aninlet and discharge port, a rotor eccentrically mounted therein, reciprocal blades carried by the rotor for contact with the inner periphery of the casing, said casing havingan annular 011 receiving groove adJacent one end, mcluding an offset branch opening into the casing ad acent the inlet port there- .of, an oil supply pipe communicating with said groove, said rotor having spaced longitudin'al oil receiving bores arranged beliind said blades, and adapted to singly register with said offset branch of the annular groove, and radially dis osed' bores leading from the first mentioned ores to the periphery of the rotor, whereby oil is intermittent- 1y supplied to the periphery of the rotor during the suction periods.

each blade havin spaced radial bores, springs located therein, oops surrounding the shaft of the rotor and arranged in said recesses, and pins projecting from the ends of each loop and received by the bores of the adjacent blades, whereby said springsare compressed to maintain said blades in effective engagement with the inner periphery of the casing.

Dated at Vancouver, B. 0., this 13th day of March, 1929. a v SIDNEY SMITH.

'2. In a rotar compressor, a casing having an inlet and ischarge port, heads closing theends of said casing, and each formed with an annular recess on the inner side thereof, a rotor eccentrically mounted within the cas ing, reciprocal blades carried by said rotor,

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