Diaphragm pump

Abstract

A diaphragm pump is provided. The diaphragm includes an upper housing, a diaphragm, and a lower housing. Recessed parts are formed in the surfaces of the upper and lower housings that face the diaphragm to define an upper pump chamber and a lower pump chamber above and below the diaphragm. A suction port and a discharge port are formed in the lower housing to communicate with the lower pump chamber. Branch channels are formed in the lower housing and the upper housing to communicate the suction port and the discharge port with the upper pump chamber. Suction-side check valves are respectively provided between the suction port and the upper pump chamber and between the suction port and the lower pump chamber. Discharge-side check valves are provided between the discharge port and the upper pump chamber and between the discharge port and the lower pump chamber.

1 . A diaphragm pump comprising: 
 an upper housing, diaphragm, and lower housing;    recessed parts thatare respectively formed in the surfaces of the upper and lower housings opposing the diaphragm to define an upper pump chamber and a lower pump chamber above and below the diaphragm;    a suction port and a discharge port that are formed in the lower housing to communicate with the lower pump chamber;    branch channels that are formed in the lower housing and the upper housing to communicate the suction port and the discharge port with the upper pump chamber;    suction-side check valves that are provided between the suction port and the upper pump chamber and between the suction port and the lower pump chamber; and    discharge-side check valves that are provided between the discharge port and the upper pump chamber, and between the discharge port and the lower pump chamber,    wherein the branch channels include at least one hole, a protruding cylindrical part fitted into the hole, and a sealing ring disposed in an annular gap formed between the hole and the protruding cylindrical part such that a compressive force is generated in the radial direction of the sealing ring.    
   
   
       2 . The diaphragm pump according to  claim 1 , 
 wherein the upper housing includes a pump chamber plate that is stacked on the diaphragm and has the recessed part, and a blind plate stacked on the pump chamber plate.    
   
   
       3 . The diaphragm pump according to  claim 2 , wherein a pair of inter-plate suction flow channels and an inter-plate discharge flow channel that communicate the suction port and the discharge port with the upper pump chamber and that constitute parts of the branch channels are formed between the pump chamber plate and the blind plate.  
   
   
       4 . The diaphragm pump according to  claim 3 , wherein the inter-plate suction flow channel and the inter-plate discharge flow channel includes a pair of protruding parts formed in any one of the pump chamber plate and the blind plate.  
   
   
       5 . The diaphragm pump according to  claim 4 , wherein a pair of recessed groove parts that are formed in the another pump chamber plate and the blind plate to allow the pair of protruding parts to fit thereinto.  
   
   
       6 . The diaphragm pump according to  claim 5 , wherein a pair of sealing rings which are disposed in a pair of closed curve gaps between the pair of protruding parts and the pair of recessed groove parts such that a compressive force are generated radially.  
   
   
       7 . The diaphragm pump according to  claim 1 , 
 wherein the upper housing is composed of an upper plate stacked on the diaphragm and a pair of lid plates.    
   
   
       8 . The diaphragm pump according to  claim 7 , wherein the upper plate is formed with recessed parts that are opened to the front and back of the upper plate to form the upper pump chamber.  
   
   
       9 . The diaphragm pump according to  claim 8 , wherein a pair of open suction flow channel grooves and an open discharge flow channel groove that constitute parts of the branch channels that communicate the suction port and the discharge port with the upper pump chamber, any one of the upper plate and the pair of lid plates is formed with protruding parts corresponding to the open suction flow channel groove and the open discharge flow channel groove.  
   
   
       10 . The diaphragm pump according to  claim 9 , wherein the other one of the upper plates and the pair of lid plates is formed with recessed groove parts to allow the pair of protruding parts to fit thereinto.  
   
   
       11 . The diaphragm pump according to  claim 9 , wherein a pair of sealing rings are interposed between the protruding parts and the recessed groove parts such that a compressive force is generated radially.  
   
   
       12 . The diaphragm pump according to  claim 2 , 
 wherein the protruding parts, the recessed groove parts, and the sealing rings are elliptical.    
   
   
       13 . The diaphragm pump according to  claim 3 , 
 wherein the protruding parts, the recessed groove parts, and the sealing rings are elliptical.    
   
   
       14 . The diaphragm pump according to  claim 1 , 
 wherein a compressive force in the stacked direction of the upper housing, the diaphragm, and the lower housing is not applied to any of the sealing rings.    
   
   
       15 . The diaphragm pump according to  claim 1 , wherein the at least one hole is formed in the upper housing.  
   
   
       16 . The diaphragm pump according to  claim 1 , wherein the at least one hole is formed in the lower housing.