Vaccum-generating unit

Abstract

A main body comprises first to third block members composed of resin materials. A nozzle hole and a diffuser hole are integrally formed in the third block member. A suction passage is provided between the nozzle hole and the diffuser hole.

1 . A vacuum-generating unit comprising: 
 a main body provided with a pressure fluid supply port connected to a pressure fluid supply source, a vacuum port connected to a suction mechanism, and a discharge port for discharging a pressure fluid supplied from said pressure fluid supply port to the outside; and    an ejector for generating a negative pressure based on said pressure fluid supplied from said pressure fluid supply port,    said ejector including a nozzle hole and a diffuser hole which are formed integrally in said main body.    
   
   
       2 . The vacuum-generating unit according to  claim 1 , wherein said main body includes a plurality of block members composed of resin materials, and said nozzle hole and said diffuser hole are integrally formed in one of said block members.  
   
   
       3 . The vacuum-generating unit according to  claim 1 , further comprising a pressure sensor for detecting said negative pressure derived from said vacuum port, wherein said pressure sensor is detachably and exchangeably connected to said main body by the aid of a tube joint.  
   
   
       4 . The vacuum-generating unit according to  claim 1 , wherein said nozzle hole and said diffuser hole are arranged coaxially respectively, said nozzle hole including an orifice, and said diffuser hole having a diameter larger than that of said nozzle hole and a predetermined length in an axial direction.  
   
   
       5 . The vacuum-generating unit according to  claim 4 , wherein said discharge port is formed at an exit end of said diffuser hole, and a silencer is provided to discharge said pressure fluid supplied from said discharge port to the outside.  
   
   
       6 . The vacuum-generating unit according to  claim 1 , wherein a suction passage is formed between said nozzle hole and said diffuser hole.  
   
   
       7 . The vacuum-generating unit according to  claim 1 , wherein said vacuum-generating unit is connected in a row to another vacuum-generating unit to construct a manifold.