US1685841A

US1685841A - Crank-case vent

Info

Publication number: US1685841A
Application number: US113916A
Authority: US
Inventors: Clyde C Farmer
Original assignee: Westinghouse Air Brake Co
Current assignee: Westinghouse Air Brake Co
Priority date: 1926-06-05
Filing date: 1926-06-05
Publication date: 1928-10-02
Anticipated expiration: 1945-10-02

Description

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C. C. FARMIEW CRANK CASE VENT Filed June 5, 1926 v INVENTOIR CLYDE C. IFARMER ATTDRN EV t lt ti l i;

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enema-case vane.

Application filed Inns 5,

This invention relates to fluid coniprcssets and more particularly to an atmospheric vent device for the crank case of the compressor.

Tn compressors of the reci inoeating piston type, the fluid in the crank case is alteriiatecoinpressed and rarefied as the compressor pistons reciprocate. It has heretofore been proposed to provide the cranlfr case of a compressor of the reciprocating piston type with an atmospheric vent, so as to permit flow t fluid to and from the crank case.

When air from the atmosphere is drawn into the crank case on the compressor stroke of the compressor pistons, dirt or particles of foreign material are liable to enter with the air, with the result that the particles become mixed with the lubricating oil and 20 tend to cause undue Wear of the bearings.

The principal object of my invention is to provide a c 'ank case vent device having means for preventing dirt or particles of foreign matter from entering the crank case of the compressor.

in the accompanying drawing; Fig. 1 is a side elevation of a fluid compressor show ing my improved crank case vent device applied thereto; and Fig. 2 a section on the line 2-2 of Fig. 1.

The fluid compressor may comprise the usual casing 1 having cylinders 2, each containing a compressor piston 3, connected by connecting rod l to crank shaft 5, which is contained in crank case chamber 6.

According to my invention, the crank case vent device is formed as a part of thebono pressor casing and consists oi Walls so dis posed as to provide pockets 7 and 8 comniunicating with each other through an opening 9. l

The pocket 7 is open to the crank case chamber 6 through an opening 10, the enclosing wall 11 of which extends upwardly into a pocket 12 itormcd in the usual cover plate 13. The pocket 12 is sufliciently large to provide a passageway from the opening to the crank case chamber.

Tn the pocket 8 is an inclined baffle plate ll adjacent to the opening 9 and of less width than the Width of the pocket so as to provid an opening 15 for the passage oi fluid. Below 1.55%, a

iee'e. semi no. risers.

portion 16 is provided on the side wall or the pocket. having oppositely inclined tacos 17 and 18. On the opposite side wall of the pocket is a projecting portion 19 having oppositely inclined faces 20 and 21 and dis posed below the projecting portion 16.

tilj'niced from the projecting portion 19 is a Web having faces and 24; disposed siiil'istanti'ally parallel with the faces 20 and 21. and ii'aces 25 and 26, with face 25 parallcl with. face 18 and face 26 with an inclined face 2'? at a projecting portion 28 ct the eoirrespoi'iding side Wall of the pocket.

The tortuous channels formed by the web 22 and the side wall projecting portions open downwardly to the atmosphere. The pocket 8 is covered or enclosed by a cover plate 29, shown applied in Fig. 2, the cover plate being removed in Fig. 1 to more clearly show the construction.

Tn operation, When fluid is exhaled from the crank case chamber, the fluid. is more or less laden with oil vapor and flows from said chamber, through the opening 10 to pocket 7 and thence through opening 9 and impinges on face 30 of the plate 14. The direction oi flow thus changed, and fluid. continues its flow through opening 15, thence the. flow impinges on face 17, chang ing the direction oil flow. Fluid then flows through the channels formed at opposite sides of the web 22 and impinges on faces 20 and 25 and finally upon faces 24iand 27, after which the fluid escapes to the atmosphere.

In this flow ct fluid, the oil vapor carried by the air tends to be deposited as oil globules 011 the several faces against which the current of air impinges and this deposited oil film is made use of to prevent dirt particles from entering the crank case, as will now be described.

When air is inhaled, the air flows in through the exhaust openings of the crank case vent device and. first impinges on the faces 21 and 26. Some particles of matter, heavier than air, tend to be deflected back toward the exhaust openings and as the flow of air continues, the current impinges on the faces 18 and 23, similarly deflecting some of the dirt particles. The flow of air then impin es on the face 31 and. iii flows upvvai 1y through the opening then through the opening 9 to the pocket 7, whence the air flows through the opening 10 to the crank case chamber 6.

The film of oil which tends to collect on the faces 17, 20, 25, 2 1, and 27 tends to hold particles of foreign matter and prevent their entrance into the crank case chamber and in time all. surfaces exposed to the current of air within the vent device tend to become coated with a film of oil which tends to collect dirt particles and prevent their en'- trance into the crank case chamber. If the oil film collects to a suiiicient extent, the excess oil will flow by gravity out through the exhaust openings of the vent device.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

' '1. The combination with a reciprocating piston machine having a crank case Cl121l11- ber,'of a crank case air vent device having portions provided with faces against which the air current laden with oil vapor exhaled from the crank case chamber impinges and on which oil tends to deposit, and faces against which the air current carrying dirt particles impinges when air is inhaled, the particles tending to be deflected back in part and in part to be held against movement to the crank case chamber by the dcposited oil, the faces on which oil tends to collect being disposed so that the mllevted oil tends to drain out to the ati'nosphero by gravity flow.

2. The combination with a reciprocating piston machine having a. crank case chamber, of a crank case air vent device having tortuous passages the walls of which act as bafl'lc plates to impede the movement of dirt particles in the current of air flowing to the crank case chamber and as surfaces to collect oil in the current of air flowing out of the crank case chamber oil so collecting serving as a medium to hold dirt particles in suspension all oil collecting surfaces being i so inclined that oil collecting thereon will tend to flow by gravity to the atmosphere.

In testimony whereof I have hereunto set my hand.

CLYDE C. FA RMER.