Oil equalization system

Claim 2

In a refrigeration system embodying a plurality of compressors, each having an oil chamber therein, an oil level maintaining device in each of said chambers, and a common oil line communicating with each of said devices, the improvement comprising: said oil level equalizing device being associated with a sight glass through which the level of the oil in the oil chamber may be seen.

Claim 3

In a refrigeration system embodying a plurality of compressors, each having an oil chamber therein, an oil level maintaining device in each of said chambers, and a commOn oil line communicating with each of said devices, the improvement comprising: said oil level maintaining device including a dip tube extending into the oil chamber at a point above the level of the oil in said chamber and extending downward to a point establishing the lowermost level of the oil to be maintained in the chamber of the compressor; and said dip tube being mounted within a wall of said oil chamber by releasable fastening means; whereby said dip tube may be easily removed from said oil chamber without substantial losses of oil during maintenance periods and the like.

Claim 4

In a refrigeration system embodying a plurality of compressors, each having an oil chamber therein, an oil level maintaining device in each of said chambers, and a commOn oil line communicating with each of said devices, the improvement comprising: said oil level maintaining device including a dip tube extending into the oil chamber at a point above the level of the oil in said chamber and extending downward to a point establishing the lowermost level of the oil to be maintained in the chamber of the compressor; and said dip tube being mounted within a wall of said oil chamber by releasable fastening means; whereby said dip tube may be easily removed from said oil chamber without substantial losses of oil during maintenance periods and the like.

Claim 5

An improvement according to claim 2, wherein said releasable fastening means comprises threaded fastening means formed on said dip tube and on a marginal edge of a surface adjacent adjacent said oil chamber defining an aperture through which said dip tube operationally extends.

Claim 6

An improvement according to claim 3, wherein said oil level equalizing device is associated with a sight glass through which the level of the oil in the oil chamber may be seen.

Claim 7

In a refrigerant system comprising a plurality of compressors for circulating refrigerant through such system, a common manifold to which refrigerant returning to the compressors is supplied and wherein oil is separated from the refrigerant, an oil distributor communicating with said manifold to receive oil therefrom, and oil return lines extending from said distributor to each of said compressor, the improvement comprising: said plurality of compressors for circulating refrigerant consisting of at least three compressors; said oil return lines extending from said distributor to each of said compressors comprising one oil return line for each of said at least three compressors; and at least two of said return lines being substantially equal in length.

Claim 8

In a refrigerant system comprising a plurality of compressors for circulating refrigerant through such system, a common manifold to which refrigerant returning to the compressors is supplied and wherein oil is separated from the refrigerant, an oil distributor communicating with said manifold to receive oil therefrom, and oil return lines extending from said distributor to each of said compressor, the improvement comprising: said plurality of compressors for circulating refrigerant consisting of at least three compressors; said oil return lines extending from said distributor to each of said compressors comprising one oil return line for each of said at least three compressors; and at least two of said return lines being substantially equal in length.