Fluid machine including diffuser

Abstract

In a fluid machine, there is provided each diffuser flow passage for making uniform a flow in a downstream of a diffuser. The fluid machine is provided, and it has the diffuser for converting kinetic energy of a fluid into pressure energy. The diffuser has first and second diffuser flow passages configured so that the fluid passes through them, and shapes of the first and second diffuser flow passages are different from each other.

1 - 9 . (canceled) 
     
     
         10 . A fluid machine comprising:
 a diffuser for converting kinetic energy of a fluid into pressure energy, wherein   the diffuser has a first diffuser flow passage and a second diffuser flow passage configured such that the fluid passes through the first and second diffuser flow passages, and wherein   the first and second diffuser flow passages have different shapes.   
     
     
         11 . The fluid machine according to  claim 10 , wherein
 each of the first and second diffuser flow passages has an inlet, and wherein   in at least a part of each of the first and second diffuser flow passages, a cross sectional area perpendicular to each of flow passage centers at a position with an equal distance from each of the inlets of the first and second diffuser flow passages is different from each other.   
     
     
         12 . The fluid machine according to  claim 10 , wherein
 the fluid machine has a first rotatable impeller for giving a fluid kinetic energy, and wherein   the first diffuser flow passage and the second diffuser flow passage are located on a downstream of the first impeller in a flow direction of the fluid.   
     
     
         13 . The fluid machine according to  claim 11 , wherein
 the fluid machine has a first rotatable impeller for giving a fluid kinetic energy, and wherein   the first diffuser flow passage and the second diffuser flow passage are located on a downstream of the first impeller in a flow direction of the fluid.   
     
     
         14 . The fluid machine according to  claim 12 , wherein
 each of the first and second diffuser flow passages has an outlet,   the fluid machine has:
 a first confluence flow passage fluidly connected to each of the outlets of the first and second diffuser flow passages; 
   a first crossover flow passage fluidly connected to the first confluence flow passage, the first crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a first return flow passage for supplying the fluid to a second impeller of a next stage, the second impeller located on a downstream of the first impeller in a flow direction of the fluid, the first return flow passage being fluidly connected to the first crossover flow passage, and wherein 
   the first return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         15 . The fluid machine according to  claim 13 , wherein
 each of the first and second diffuser flow passages has an outlet,   the fluid machine has:
 a first confluence flow passage fluidly connected to each of the outlets of the first and second diffuser flow passages; 
   a first crossover flow passage fluidly connected to the first confluence flow passage, the first crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a first return flow passage for supplying the fluid to a second impeller of a next stage, the second impeller located on a downstream of the first impeller in a flow direction of the fluid, the first return flow passage being fluidly connected to the first crossover flow passage, and wherein 
   the first return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         16 . The fluid machine according to  claim 14 , wherein the second diffuser flow passage is located closer to the first crossover flow passage than the first diffuser flow passage, and the cross sectional area of the second diffuser flow passage is larger than that of the first diffuser flow passage. 
     
     
         17 . The fluid machine according to  claim 15 , wherein the second diffuser flow passage is located closer to the first crossover flow passage than the first diffuser flow passage, and the cross sectional area of the second diffuser flow passage is larger than that of the first diffuser flow passage. 
     
     
         18 . The fluid machine according to  claim 16 , wherein
 the first diffuser flow passage and the second diffuser flow passage are configured such that each of the cross sectional areas are increased from the inlets toward the outlets of the respective diffuser flow passages, and wherein   the second diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         19 . The fluid machine according to  claim 17 , wherein
 the first diffuser flow passage and the second diffuser flow passage are configured such that each of the cross sectional areas are increased from the inlets toward the outlets of the respective diffuser flow passages, and wherein   the second diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         20 . The fluid machine according to  claim 14 , wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid,   each of the third and fourth diffuser flow passages has an outlet,   the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
   a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
   the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         21 . The fluid machine according to  claim 15 , wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid,   each of the third and fourth diffuser flow passages has an outlet,   the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
   a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
   the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         22 . The fluid machine according to  claim 16  wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid, 
 each of the third and fourth diffuser flow passages has an outlet, 
 the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
 
 a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
 
 the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller. 
 
     
     
         23 . The fluid machine according to  claim 17 , wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid,   each of the third and fourth diffuser flow passages has an outlet,   the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
   a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
   the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         24 . The fluid machine according to  claim 18 , wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid,   each of the third and fourth diffuser flow passages has an outlet,   the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
   a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
   the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         25 . The fluid machine according to  claim 10 , wherein
 the diffuser has a third diffuser flow passage and a fourth diffuser flow passage configured such that the fluid passes through the third and fourth diffuser flow passages, and the third and fourth diffuser flow passages are located on the downstream of the first impeller in the flow direction of the fluid,   each of the third and fourth diffuser flow passages has an outlet,   the fluid machine has:
 a second confluence flow passage fluidly connected to each of the outlets of the third and fourth diffuser flow passages; 
   a second crossover flow passage fluidly connected to the second confluence flow passage, the second crossover flow passage running in a direction of a rotatable shaft of the first impeller; and
 a second return flow passage for supplying the fluid to the second impeller, the second return flow passage being fluidly connected to the second crossover flow passage, and wherein 
   the second return flow passage runs in a radially inward direction to a rotatable shaft of the first impeller.   
     
     
         26 . The fluid machine according to  claim 11 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         27 . The fluid machine according to  claim 12 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         28 . The fluid machine according to  claim 13 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         29 . The fluid machine according to  claim 14 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         30 . The fluid machine according to  claim 15 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         31 . The fluid machine according to  claim 16 , wherein the third diffuser flow passage and the fourth diffuser flow passage have shapes of rotation symmetry of the first diffuser flow passage and the second diffuser flow passage, respectively. 
     
     
         32 . The fluid machine according to  claim 11 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         33 . The fluid machine according to  claim 12 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         34 . The fluid machine according to  claim 13 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         35 . The fluid machine according to  claim 14 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         36 . The fluid machine according to  claim 15 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         37 . The fluid machine according to  claim 16 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         38 . The fluid machine according to  claim 17 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         39 . The fluid machine according to  claim 18 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         40 . The fluid machine according to  claim 19 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         41 . The fluid machine according to  claim 20 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         42 . The fluid machine according to  claim 21 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.   
     
     
         43 . The fluid machine according to  claim 22 , wherein
 the third diffuser flow passage and the fourth diffuser flow passage are configured such that each of the cross sectional areas are increased from inlets toward outlets of the respective diffuser flow passages, and wherein   the fourth diffuser flow passage has a relatively large region, small region, and large region in increase rates of the cross sectional areas from the inlet toward the outlet of the diffuser flow passage.