Fluid machine

Abstract

A fluid machine includes a rotatable hub; a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and a shroud extending along a circumferential direction with respect to the rotation center of the hub and covering the plurality of blades. The shroud includes: a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and a plurality of resonators provided in the flow passage.

What is claimed is: 
     
       1. A fluid machine comprising:
 a rotatable hub; 
 a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and 
 a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud comprising:
 a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and 
 a plurality of resonators provided in the flow passage, 
 
 wherein the shroud comprises:
 an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and 
 an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades, 
 
 wherein the plurality of resonators are arranged in the flow passage with a uniform density in an entire area of the flow passage from the inlet portion of the shroud to the outlet portion. 
 
     
     
       2. The fluid machine of  claim 1 , wherein each of the plurality of resonators comprises:
 an opening portion provided on a surface of the flow passage facing the plurality of blades; and 
 a space portion connected to the opening portion and extending radially from the opening portion, the space portion forming a hollow space in the shroud. 
 
     
     
       3. The fluid machine of  claim 1  further comprising a base arranged around the hub, extending along a circumferential direction with respect to the rotation center of the hub and supporting the plurality of blades. 
     
     
       4. The fluid machine of  claim 1 , wherein the flow passage extends from the inlet portion toward the outlet portion and is formed in at least a partial section of the inner surface of the shroud. 
     
     
       5. A fluid machine comprising:
 a rotatable hub; 
 a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and 
 a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud comprising:
 a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and 
 a plurality of resonators provided in the flow passage, 
 
 wherein the shroud comprises:
 an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and 
 an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades, and 
 
 wherein a density of the plurality of resonators arranged in the flow passage increases from the inlet portion of the shroud toward the outlet portion. 
 
     
     
       6. The fluid machine of  claim 5 , wherein the plurality of resonators are arranged only in a partial area of an entire area of the flow passage. 
     
     
       7. A fluid machine comprising:
 a rotatable hub; 
 a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and 
 a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud comprising:
 a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and 
 a plurality of resonators provided in the flow passage, 
 
 wherein the shroud comprises:
 an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and 
 an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades, 
 
 wherein the plurality of resonators are arranged only in a partial area of an entire area of the flow passage, and 
 wherein the plurality of resonators are arranged in an area of the flow passage located at a distance from the inlet portion of the shroud determined by a preset distance from the inlet portion of the shroud toward the outlet portion. 
 
     
     
       8. A fluid machine comprising:
 a rotatable hub; 
 a plurality of blades spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and 
 a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud comprising:
 a flow passage, the flow passage formed to be recessed with respect to an inner surface of the shroud facing the blades; and 
 a plurality of resonators provided in the flow passage, 
 
 wherein each of the plurality of resonators comprises:
 an opening portion provided on a surface of the flow passage facing the plurality of blades; and 
 a space portion connected to the opening portion and extending radially from the opening portion, the space portion forming a hollow space in the shroud, and 
 
 wherein the shroud comprises:
 a first plate arranged at a position contacting the plurality of blades and comprising the flow passage and the opening portion of each of the plurality of resonators; and 
 a second plate provided on the first plate and comprising the space portion of each of the plurality of resonators at a position corresponding to the opening portion of each of the plurality of resonators. 
 
 
     
     
       9. A fluid machine comprising:
 a rotatable hub; 
 a base connected to the hub and extending radially from the hub; 
 a plurality of blades provided on the base and spaced apart from one another along a circumferential direction with respect to a rotation center of the hub; and 
 a shroud extending along the circumferential direction with respect to the rotation center of the hub and covering the plurality of blades, the shroud comprising:
 an inner surface facing the base and contacting the plurality of blades; 
 a flow passage formed to be recessed with respect to the inner surface of the shroud facing the base; and 
 a plurality of resonators provided in the flow passage. 
 
 
     
     
       10. The fluid machine of  claim 9 , wherein the shroud comprises:
 an inlet portion configured to guide an inflow of fluid toward the plurality of blades; and 
 an outlet portion configured to guide discharge of the fluid that has passed through the plurality of blades. 
 
     
     
       11. The fluid machine of  claim 9 , wherein the flow passage comprises:
 a first region in which the plurality of resonators are arranged; and 
 a second region in which none of the plurality of resonators are provided in the flow passage.