Handheld vacuum suction device

Abstract

A handheld vacuum suction device includes: an exterior case; a cap that includes a suction nozzle; a pressure switch unit that includes a pressure switch having a slide body configured to descend against a spring when a pressure in the cap falls below a predetermined pressure, to thereby cut off power supply, and a vertical through suction duct; a vacuum pump that includes an inlet port connected to the suction duct and sucks in air; and a control that includes an actuating switch, and is electrically connected to the vacuum pump and the pressure switch to control the actuation of the vacuum pump.

1 . A handheld vacuum suction device, comprising:
 an exterior case;   a cap detachably mounted to a lower end of the exterior case, the cap including a suction nozzle having a suction port formed at its lower portion, the suction nozzle including a side exhaust hole in communication with the suction port through its side surface;   a pressure switch unit disposed within the exterior case, the pressure switch unit including a vertical suction duct and further including a pressure switch having a slide body configured to actuate the pressure switch by descending against the elastic force of a spring when the pressure in the cap falls below a predetermined pressure;   a vacuum pump that includes an inlet port connected to the vertical suction duct and configured to draw air through the inlet port responsive to activation; and   a control unit electrically connected to the pressure switch and to the vacuum pump and including an actuating switch, the control unit configured to activate the vacuum pump responsive to actuation of the actuating switch and further configured to deactivate the vacuum pump responsive to actuation of the pressure switch.   
   
   
       2 . The handheld vacuum suction device of  claim 1 , wherein the pressure switch of the pressure switch unit includes:
 a conductive contact panel in contact with a pair of terminals;   the slide body, to which the contact panel is fixedly mounted;   a cover that is provided at a lower portion of the slide body; and   the spring that is provided between the slide body and the cover to elastically support the slide body, and   the slide body configured to descend such that the contact panel is separated from the terminals when the pressure in the cap falls below the predetermined pressure.   
   
   
       3 . The handheld vacuum suction device of  claim 2 , wherein one end of each of the terminals extends through a terminal insertion hole which is formed in a pressure switch unit main body of the pressure switch unit. 
   
   
       4 . The handheld vacuum suction device of  claim 2 , wherein the contact panel is in a center-through disc shape and has contacts which elastically support the tail ends of the terminals. 
   
   
       5 . The handheld vacuum suction device of  claim 2 , wherein the slide body includes a cylindrical main body and a slide rod formed at the upper center of the cylindrical main body, and
 a ring engagement groove disposed on a side of the cylindrical main body and configured to accept a sealing ring that provides an airtight seal.   
   
   
       6 . The handheld vacuum suction device of  claim 5 , wherein engagement protrusions are provided at a lower portion of the cylindrical main body and are configured to be fitted into engagement protrusion insertion grooves which are formed in the cover. 
   
   
       7 . The handheld vacuum suction device of  claim 2 , wherein a hollow cylindrical spring mounting portion is provided at an upper center of the cover. 
   
   
       8 . The handheld vacuum suction device of  claim 1 , wherein the vacuum pump includes:
 a motor;   a fixture having a slant pin, the upper portion of the slant pin placed a predetermined distance from a rotation center and slanting toward the rotation center, the fixture coupled to a driving shaft of the motor;   a rolling plate that is coupled to the slant pin and configured to eccentrically shake in a vertical direction according to the rotation of the fixture; and   a diaphragm unit having at least two diaphragms whose volume is changed according to the eccentric shaking of the rolling plate, the diaphragm unit configured to perform intake and exhaust operations repeatedly according to the change in the volume of the diaphragms.   
   
   
       9 . The handheld vacuum suction device of  claim 8 , wherein the rolling plate includes actuating wings extending laterally, each of the actuating wings having an actuating protrusion insertion groove into which an actuating protrusion of the corresponding diaphragm is fitted. 
   
   
       10 . The handheld vacuum suction device of  claim 8 , wherein an exhaust valve is provided at the center of the diaphragm unit, a guide ring having exhaust paths at its side is provided above the diaphragms, and the guide ring is fixedly mounted to an air port. 
   
   
       11 . The handheld vacuum suction device of  claim 10 , wherein an intake valve is provided in a chamber of each of the diaphragms. 
   
   
       12 . The handheld vacuum suction device of  claim 10 , wherein an exhaust port is formed at the center of the air port, and a groove for air inflow is formed at an upper portion of the air port. 
   
   
       13 . The handheld vacuum suction device of  claim 1  further comprising:
 a stand that has a stand main body and a crater-shaped standing portion formed at an upper portion of the stand main body, the cap being inserted into the standing portion.   
   
   
       14 . The handheld vacuum suction device of  claim 13 , wherein the stand main body is in a truncated cone shape, and the standing portion is formed to follow the exterior shape of the cap.