Hand-held vacuum pump and automated urinary drainage system using pump thereof

Abstract

In the hand-held vacuum pump 1, the main body 1 a of the vacuum pump in which the pump room 4 a is formed and the electric motor 2 are connected via the shaft coupling 21. The main body of the vacuum pump has the driving shaft 10. One ball bearing 15 b supporting the driving shaft is supported by the cylinder. The other ball bearing 15 a is sup ported by the flange 5 mounted hermetically at the cylinder. The end part of the cylinder at the side of the electric motor accommodates the shaft coupling, and is engaged with the end part of the electric motor so that the electric motor may support the cylinder.

1 . A hand-held vacuum pump formed by connecting an electric motor and a main body of vacuum pump formed with a pump room via a shaft coupling, wherein 
 one bearing supporting a driving shaft of said main body of vacuum pump is supported by a cylinder, and the other bearing is supported by a flange mounted hermetically at said cylinder;    an end part of said cylinder at a side of an electric motor accommodates said shaft coupling and is engaged with an end part of said electric motor; and    said electric motor supports said cylinder.    
     
     
         2 . A hand-held vacuum pump of  claim 1 , wherein 
 a round hole engaged with a rotating shaft of said electric motor is formed at one side of said shaft coupling;    a quasi-square hole engaged with a drive shaft penetrating inside said cylinder is formed at the other side of said shaft coupling; and    a hole engaged with a rotating shaft of said electric motor is formed at said driving shaft so that a locking screw for said shaft coupling and said rotating shaft of said electric motor may not required.    
     
     
         3 . A hand-held vacuum pump of  claim 2 , wherein 
 an eccentric shaft made of resin material aligned with an eccentric axis to said driving shaft and having an outline cylindrical part is provided;    a piston having an extension part configured as a plate structure at a part of periphery is mounted at an outer side of said eccentric shaft; and    plural protruding parts extending in an axial direction of an inner face of said eccentric shaft are formed at an engaged part between said driving shaft and said eccentric shaft.    
     
     
         4 . A hand-held vacuum pump of  claim 2 , wherein 
 a material to be used for said shaft coupling is selected to be a resin material; and    plural protruding parts extending in an axial direction at an inner face of a round hole formed said shaft coupling, or plural protruding parts extending in a radial direction and connecting to said round hole.    
     
     
         5 . A hand-held vacuum pump wherein 
 a couple of sliding cylinders clamping both sides of an intermediate part of an extension part of said plate structure and having a circular arc part is provided;    said sliding cylinder is supported by a cylinder and said siding cylinder is made oscillating inside said cylinder;    said cylinder and said piston are formed as double cylinders; and    a pump room is formed so that a shape of said pump room may change between said double cylinders.    
     
     
         6 . An automated urinary drainage system having a hand-held vacuum pump of one of  claims 1  to  5 , wherein 
 an exhaust speed of said vacuum pump is 70 mL/sec or larger, and a weight of said vacuum pump is 250 g or lighter.    
     
     
         7 . A hand-held vacuum pump of  claim 1 , wherein 
 a piston is mounted at said driving shaft through an eccentric shaft;    said piston has a blade part configured as a plate structure extending towards an outer side at a part of periphery;    said sliding cylinder having a circular arc part supports said blade part so as to freely oscillate;    a material of said driving shaft is made to be stainless steel, a material of said shaft coupling is made to be PC resin or POM resin, a material of said piston is made to be PS resin or PC resin, a material of the cylinder is made to be PBT resin, and a material of said sliding cylinder is made to be PPS resin or PBT resin, in which PC stands for Polycarbonade, POM stands for Polyacetal, PS stands for Polystyrene, PPS stands for Polyphenylene Sulfide, and PBT stands for Polybutylene Terphthalate.    
     
     
         8 . A hand-held vacuum pump of  claim 7 , wherein 
 a balance weight is mounted at an end part of said driving shaft for compensating an eccentricity between said piston and said eccentric shaft;    a cover for covering said balance weight is mounted at said flange; and    a material of said flange is selected to be POM resin.    
     
     
         9 . A hand-held vacuum pump of  claim 7 , wherein 
 said cylinder and said piston are formed as double cylinders; and    a gas inside a pump room is compressed by changing a volume of said pump room formed between double cylinders by oscillating said blade part.    
     
     
         10 . A hand-held vacuum pump of  claim 7 , wherein 
 a beveled cut part having a cross-sectional shape of shaft shaped in D-sigmoid is formed at said driving shaft;    a hole corresponding to said D-sigmoid shape is formed at said eccentric shaft; and    plural protruding parts extending in an axial direction inside said hole shaped in D-sigmoid formed at an eccentric shaft.    
     
     
         11 . A hand-held vacuum pump of  claim 7 , wherein 
 a support part supporting said sliding cylinder is formed at said cylinder;    a suction passage for sucking a gas into said cylinder and a discharge passage for discharging a gas are mounted near said support part and a double cylinder part so as to be almost vertical to a vibrating blade part;    a valve configured in a sheet structure for opening and closing said discharge passage and a discharge valve presser for pressing down said valve are provided at said discharge passage.    
     
     
         12 . A hand-held vacuum pump of one of  claims 7  to  11 , wherein 
 a diameter of said hand-held vacuum pump is 30 mm or shorter, its length is 70 mm or shorter, and its weight is 250 g or lighter;    said electric motor is driven by a dry cell or a secondary battery providing an output voltage between 4V and 9V; and    an overall exhaust velocity when driven by said vacuum pump at 4000 to 6000 rpm is about 80 mL/sec.