Systems and methods for cooling bearings
Systems and methods are provided for cooling bearings or other objects. Such cooling may be accomplished by expanding a compressed gas in a cooling channel surrounding a bearing and allowing the expanded air to come into direct contact with the bearing. Expanding a compressed gas in local proximity of the bearing takes advantage of the Joule-Thompson expansion of gas, resulting in a substantial drop in gas temperature, thereby maximizing the cooling potential of the gas being directly applied to the bearing. Cooling bearings in this manner extends their operational life and enables them to operate at the desired speeds. A housing may be provided for receiving a compressed gas, expanding the compressed gas to a predetermined pressure, enabling the expanded gas to directly contact the bearing, and exhausting the expanded gas.
1. A housing for containing a compressed gas and a bearing having an outer race and an inner race, wherein the inner race is movable with respect to the outer race, and for expanding the compressed gas to a predetermined pressure and allowing the gas to directly contact the outer race of the bearing as it expands, comprising:
a restriction region having a cross-sectional area;
a channel fluidicly coupled to the restriction region, the channel extending around the outer race and constructed to allow the expanding gas to directly contact the outer race; and
at least one exhaust port fluidicly coupled to the channel, each exhaust port having a predetermined cross-sectional area, wherein a sum total of the cross-sectional area of the at least one exhaust port is sized with respect to the cross-sectional area of the restriction region to expand the compressed gas to the predetermined pressure within the channel.
2. The housing of claim 1 , further comprising an inlet port fluidicly coupled to the restriction region.
3. The housing of claim 1 , wherein the outer race has a top portion and a bottom portion, the housing further comprising:
a first membrane support channel aligned with and extending around the top portion of the outer race; and
a second membrane support channel aligned with and extending around the bottom portion of the outer race.
4. The housing of claim 3 , further comprising:
a first membrane coupled between the top portion and the first membrane support channel; and
a second membrane coupled between the bottom portion and the second membrane support channel,
the first and second membranes providing a seal which causes the expanded gas to flow around the outer race of the bearing.
5. The housing of claim 4 , wherein the first and second membranes are o-rings.
6. The housing of claim 1 , the bearing having a central axis, wherein the at least one exhaust port is aligned in a predetermined position with respect to the central axis.
7. The housing of claim 6 , wherein the predetermined position is an axial position, a radial position, or an oblique position with respect to the central axis.
8. A machine comprising a rotating body supported by the bearing of claim 1 , the machine further comprising the housing of claim 1 .