Ejector

Abstract

An ejector includes a nozzle, a body portion and a pressurizing portion. The body portion has a fluid suction port from which a fluid is drawn by a jet flow of a fluid jetted from the nozzle, and a fluid suction passage through which the fluid drawn from the fluid suction port flows while a flow direction of the drawn fluid is changed. The fluid suction passage has a suction inlet part, a suction space part, and a suction outlet part from which the fluid from the suction space part flows out in a jet direction of the jet fluid. A fluid passage area of the suction inlet part is smaller than an open area of the fluid suction port and a fluid passage area of the suction space part, and the fluid passage area of the suction outlet part is smaller than that of the suction space part.

1 . An ejector comprising:
 a nozzle configured to decompress and jet a fluid;   a body portion having a fluid suction port from which a fluid is drawn by a jet flow of the fluid jetted from the nozzle, and a fluid suction passage through which the fluid drawn from the fluid suction port flows while a flow direction of the fluid drawn from the fluid suction port is changed; and   a pressurizing portion in which a pressure of a fluid mixture between the fluid flowing through the fluid suction passage from the fluid suction port and the fluid jetted from the nozzle is increased, wherein   the fluid suction passage is configured to have a suction inlet part into which the fluid from the fluid suction port flows, a suction space part in which the flow direction of the fluid flowing from the fluid suction port is changed, and a suction outlet part from which the fluid from the suction space part flows out in a jet direction of the jet fluid,   the suction inlet part has a fluid passage area that is smaller than an open area of the fluid suction port and a fluid passage area of the suction space part, and   the fluid passage area of the suction outlet part is smaller than the fluid passage area of the suction space part.   
   
   
       2 . The ejector according to  claim 1 , wherein
 the fluid suction port is connected to a fluid suction pipe in which the fluid to be drawn into the fluid suction port flows, and   the fluid passage area of the suction inlet part is smaller than a fluid passage area of the fluid suction pipe.   
   
   
       3 . The ejector according to  claim 2 , wherein the fluid passage area of the fluid suction pipe is gradually reduced as toward the fluid suction port. 
   
   
       4 . The ejector according to  claim 1 , wherein the suction inlet part is an orifice. 
   
   
       5 . The ejector according to  claim 1 , wherein an extending line of a flow direction of the fluid drawn from the fluid suction port is crossed perpendicularly with an extending line of the jet direction of the fluid jetted from the nozzle. 
   
   
       6 . The ejector according to  claim 1 , wherein the suction space part is provided on an outer peripheral side of the nozzle. 
   
   
       7 . The ejector according to  claim 1 , wherein a ratio of the fluid passage area of the suction inlet part to the open area of the fluid suction port is equal to or smaller than 0.5. 
   
   
       8 . The ejector according to  claim 2 , wherein a ratio of the fluid passage area of the suction inlet part to the maximum fluid passage area of the fluid suction pipe is equal to or smaller than 0.5. 
   
   
       9 . The ejector according to  claim 1 , wherein a ratio of the fluid passage area of the suction outlet part to the fluid passage area of the suction space part is equal to or smaller than 0.5. 
   
   
       10 . The ejector according to  claim 1 , wherein
 the suction space part is an approximately cylindrical passage provided on the outer peripheral side of the nozzle to extend in an axial direction of the nozzle, and   the suction outlet part extends coaxially with the cylindrical passage of the suction space part and is tapered downstream.   
   
   
       11 . The ejector according to  claim 10 , wherein
 the nozzle is located to protrude into the suction outlet part from the suction space part coaxially with the cylindrical passage, and   the suction inlet part is open to the cylindrical passage in a direction approximately perpendicular to the axial direction of the nozzle.   
   
   
       12 . The ejector according to  claim 1 , further comprising
 a cylindrical mixing passage provided between the suction outlet part and the diffuser coaxially.   
   
   
       13 . An ejector comprising:
 a nozzle configured to decompress and jet a fluid;   a body portion having a fluid suction port from which a fluid is drawn by a jet flow of the fluid jetted from the nozzle, and a fluid suction passage through which the fluid drawn from the fluid suction port flows while a flow direction of the fluid drawn from the fluid suction port is changed; and   a pressurizing portion in which a pressure of a fluid mixture between the fluid flowing through the fluid suction passage from the fluid suction port and the fluid jetted from the nozzle is increased, wherein   the fluid suction port is connected to a fluid suction pipe in which the fluid to be drawn into the fluid suction port flows,   the fluid suction passage is configured to have a suction inlet part into which the fluid from the fluid suction port flows, a suction space part in which the flow direction of the fluid flowing from the fluid suction port is changed, and a suction outlet part from which the fluid from the suction space part flows out in a jet direction of the jet fluid,   the suction inlet part has a fluid passage area that is smaller than a fluid passage area of the fluid suction pipe and a fluid passage area of the suction space part, and   the fluid passage area of the suction outlet part is smaller than the fluid passage area of the suction space part.   
   
   
       14 . The ejector according to  claim 13 , wherein
 the fluid passage area of the fluid suction pipe is gradually reduced as toward the fluid suction port, and   the fluid passage area of the suction inlet part is smaller than the smallest fluid passage area of the fluid suction pipe.