Air moving device with bypass intake
An air moving device has a housing with a primary flow path and a secondary flow path that extends from a secondary inlet of the housing and empties into an inner outlet adjacent the primary flow path. An impeller assembly rotates a blade to cause air to enter the housing and flow along the primary flow path. The flow of air through the primary flow path creates a low pressure region at the inner outlet of the secondary flow path, causing air to flow through the secondary flow path and mix with the air in the primary flow path. The mixture of air flows through a downstream portion of the primary flow path having an expanded width compared to an upstream portion of the primary flow path and exits the housing. Stator vanes may extend longitudinally within the housing to cause columnar air flow. The device may be used for destratification of thermal gradients of air within an enclosure, such as a home or warehouse.
1. An air moving device for an enclosed structure, comprising:
a housing extending axially from a primary inlet to a primary outlet and defining a primary flow path from the primary inlet to the primary outlet, the housing defining an upper outer sidewall and a lower outer sidewall and an upper inner sidewall spaced radially inward from the upper outer sidewall, the upper inner sidewall defining a lower edge located axially closer to the primary outlet than the primary inlet is located from the primary outlet;
an impeller assembly coupled with the housing and configured to rotate a blade to cause air to enter the housing through the primary inlet, flow along the primary flow path, and exit the housing through the primary outlet;
a secondary flow path extending from a secondary inlet to an inner outlet positioned between the lower outer sidewall and the upper inner sidewall, the secondary inlet defined by the lower outer sidewall of the housing and located axially closer to the primary outlet of the housing than the primary inlet of the housing is located to the primary outlet of the housing, and the inner outlet located adjacent the primary flow path within the housing; and
the upper inner sidewall extending along an inner side of the secondary flow path to the lower edge of the upper inner sidewall, wherein the primary inlet is located an axial distance D 1 from an upper edge of the secondary inlet, the secondary inlet extends an axial distance D 2 , the lower edge of the upper inner sidewall is located an axial distance D 3 from the primary inlet and the secondary flow path has a radial width of distance D 5 , and wherein D 2 >1.2×D 5 and D 3 ≥0.8(D 1 +D 2 ) and wherein further air from the primary flow path and the secondary flow path are mixed downstream of the secondary flow path.
2. The air moving device of claim 1 , wherein D 5 ≥0.5 inches and D 1 >D 2 .
3. The air moving device of claim 2 , further comprising a plurality of longitudinal stator vanes extending within the primary flow path.
4. The air moving device of claim 3 , further comprising a plurality of longitudinal ribs extending within the secondary flow path.
5. The air moving device of claim 4 , further comprising a plurality of longitudinal stator vanes extending within the primary flow path and that are radially aligned with the plurality of longitudinal ribs.
6. The air moving device of claim 4 , wherein the plurality of longitudinal stator vanes, the plurality of longitudinal ribs, and the housing, are integral.
7. The air moving device of claim 1 , wherein the primary inlet is located an axial height H from the primary outlet, the primary inlet has a radial opening equal to a width W 1 , and wherein H is at least 75% of W 1 .
8. The air moving device of claim 7 , wherein H is greater than or equal to W 1 .
9. The air moving device of claim 7 , wherein H is greater than 1.25×W 1 .
10. The air moving device of claim 2 , wherein the primary inlet is located an axial height H from the primary outlet, the primary inlet has a radial opening equal to a width W 1 , and wherein H is at least 75% of W 1 .
11. The air moving device of claim 10 , wherein H is greater than or equal to W 1 .
12. The air moving device of claim 10 wherein H is greater than 1.25×W 1 .