Vacuum pump and vacuum container having the same

Abstract

A vacuum pump includes a case having a first discharge port in the lower membrane thereof, a piston coupled to the case to enable a vertical movement and having a second discharge port in the upper membrane thereof, a first opening/closing member and a second opening/closing member opening/closing the first discharge port and the second discharge port, respectively, based on the vertical movement of the piston, an elastic member placed between the case and the piston, a first separation preventing member coupled to the upper part of the case and preventing the piston from being separated, a second separation preventing member provided inside the case and preventing the first opening/closing member from being separated, a third separation preventing member coupled to the upper part of the piston and preventing the second opening/closing member from being separated, and a first packing member coupled to the lower part of the case.

1 . A vacuum pump comprising:
 a case having a first discharge port at a lower membrane thereof;   a piston coupled to the case so as to be movable vertically and having a second discharge port at an upper membrane thereof;   a first opening/closing member adapted to open/close the first discharge port according to a vertical movement of the piston;   a second opening/closing member adapted to open/close the second discharge port according to the vertical movement of the piston;   an elastic member placed between the case and the piston and adapted to apply elastic force to the piston;   a first separation preventing member coupled to an upper portion of the case and adapted to prevent separation of the piston;   a second separation preventing member provided in the case and adapted to prevent separation of the first opening/closing member;   a third separation preventing member coupled to an upper portion of the piston and adapted to prevent separation of the second opening/closing member; and   a first packing member coupled to a lower portion of the case.   
     
     
         2 . The vacuum pump of  claim 1 , wherein each of the first opening/closing member and the second opening/closing member has a longitudinal portion adapted to be inserted in the first discharge port and the second discharge port and a wing portion covering the first discharge port and the second discharge port when the longitudinal portion is inserted in the first discharge port and the second discharge port. 
     
     
         3 . The vacuum pump of  claim 2 , wherein the wing portion has a downward slope toward radial outward direction. 
     
     
         4 . The vacuum pump of  claim 1 , wherein a supporting portion protruded upwardly from the lower membrane and supporting the second separation preventing member is provided in the case, and a catching step caught by the supporting portion is protruded radially outwardly from an external circumferential surface of the second separation preventing member. 
     
     
         5 . The vacuum pump of  claim 1 , wherein an accepting groove in which the second opening/closing member is accepted is provided at the upper membrane of the piston, and a third separation preventing portion protruded downwardly and inserted in the accepting groove is formed at the third separation preventing member. 
     
     
         6 . The vacuum pump of  claim 1 , further comprising a fixing portion adapted to be fixed to the first separation preventing member if the piston is rotated by a predetermined angle in a descent state such that the piston is fixed in the descent state. 
     
     
         7 . The vacuum pump of  claim 6 , further comprising means for pressing the first opening/closing member that press the first opening/closing member to the first discharge port in a case that the piston is fixed at the descent state. 
     
     
         8 . The vacuum pump of  claim 7 , wherein the means for pressing the first opening/closing member comprise:
 a pressing protrusion extending downwardly from the upper membrane of the piston by a predetermined length and having the second discharge port formed at a center portion thereof; and   a pressing member pressed by the pressing protrusion so as to press the first opening/closing member in a case that the piston is fixed at the descent state.   
     
     
         9 . The vacuum pump of  claim 8 , wherein cam portions corresponding to each other are formed respectively at a lower end portion of the pressing protrusion and an upper end portion of the pressing member. 
     
     
         10 . The vacuum pump of  claim 1 , further comprising an elastic member provided between the lower membrane of the case and the second separation preventing member and adapted to press the second opening/closing member when the piston descends. 
     
     
         11 . The vacuum pump of  claim 1 , further comprising a case protruding portion protruded downwardly from the lower membrane of the case by a predetermined length and provided with the first discharge port at a center portion thereof,
 wherein the first packing member is provided with a third discharge port coupled to the case protruding portion and connected to the first discharge port.   
     
     
         12 . A vacuum container comprising:
 a main body;   a cover adapted to open/close the main body and provided with a receiving portion at which a third discharge port is formed;   a sealing member coupled to the third discharge port and closely sealing an inside of the main body; and   a vacuum pump selectively coupled to the receiving portion and drawing out air in the main body to the exterior of the main body,   wherein the vacuum pump comprises:   a case having a first discharge port at a lower membrane thereof;   a piston coupled to the case so as to be movable vertically and having a second discharge port at an upper membrane thereof;   a first opening/closing member adapted to open/close the first discharge port according to a vertical movement of the piston;   a second opening/closing member adapted to open/close the second discharge port according to the vertical movement of the piston;   an elastic member placed between the case and the piston and adapted to apply elastic force to the piston;   a first separation preventing member coupled to an upper portion of the case and adapted to prevent separation of the piston;   a second separation preventing member provided in the case and adapted to prevent separation of the first opening/closing member;   a third separation preventing member coupled to an upper portion of the piston and adapted to prevent separation of the second opening/closing member; and   a first packing member coupled to a lower portion of the case and coupled to the receiving portion.   
     
     
         13 . The vacuum container of  claim 12 , wherein a coupling recess at which the first packing member is mounted is formed at an edge portion of the receiving portion. 
     
     
         14 . The vacuum container of  claim 12 , wherein the sealing member comprises a handle portion protruded upwardly, a catching portion inserted in and caught by the third discharge port, and a wing portion provided between the handle portion and the catching portion and covering the third discharge port, and
 wherein a thickness of the wing portion is within a range of 1.3 mm to 1.8 mm.   
     
     
         15 . The vacuum container of  claim 14 , wherein a pneumatic line is formed between the wing portion and the catching portion. 
     
     
         16 . The vacuum container of  claim 12 , further comprising a case protruding portion protruded downwardly from the lower membrane of the case by a predetermined length and provided with the first discharge port at a center portion thereof,
 wherein the case is extended more by a predetermined length corresponding to a length of the case protruding portion.