US 12,480,516 B2
Compressor
Raul Corralejo Anton, Burgos (ES); Robert James Kyle, Bristol (GB); and Christopher Ashley Monk, Royal Wootton Bassett (GB)
Assigned to Dyson Technology Limited, Malmesbury (GB)
Appl. No. 18/290,271
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed May 6, 2022, PCT No. PCT/GB2022/051158
§ 371(c)(1), (2) Date Nov. 10, 2023,
PCT Pub. No. WO2022/238685, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2106830 (GB), filed on May 13, 2021.
Prior Publication US 2024/0229815 A1, Jul. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F04D 29/08 (2006.01); F01D 11/02 (2006.01); F04D 17/06 (2006.01); F04D 29/16 (2006.01); F04D 29/28 (2006.01); F04D 29/44 (2006.01)
CPC F04D 29/083 (2013.01) [F01D 11/02 (2013.01); F04D 17/06 (2013.01); F04D 29/161 (2013.01); F04D 29/162 (2013.01); F04D 29/281 (2013.01); F04D 29/441 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A compressor for use in domestic appliances, the compressor comprising:
an impeller comprising an inlet, an outlet, a hub defining a rotational axis of the impeller, a plurality of impeller blades that extend from the hub and end in a blade tip, and a frustoconical shroud that at least partially surrounds the plurality of impeller blades, the shroud having an inner surface that connects to the blade tips, the impeller having an axial length;
a housing that at least partially surrounds the shroud and that is coaxially arranged with respect to the rotational axis of the impeller to allow the impeller to rotate within the housing;
a leakage flow path defined between the shroud and the housing leading from a leakage flow path inlet to a leakage flow path outlet, and
a labyrinth seal arrangement provided in the leakage flow path, wherein the labyrinth seal arrangement comprises one or more shroud rings interdigitated with one or more housing rings so as to form a tortuous flow path for fluid flowing through the leakage flow path, the one or more shroud rings having a respective axial length,
wherein the respective axial length of at least one of the one or more shroud rings is greater than 30% of the axial length of the impeller.