Electric Air Pump for Inflatable Body

Abstract

An electric air pump for pumping air into an inflatable body includes a housing having an air inlet and an air outlet, an impeller disposed in the housing, a motor configured to drive the impeller, an air passage connecting the air inlet and the air outlet, a first chamber receiving the motor and including a ventilation inlet and ventilation outlet, and a heat dissipation impeller configured to be driven by the motor so that air flows into the first chamber through the ventilation inlet and flows out of the first chamber through the ventilation outlet for heat dissipation of the motor.

What is claimed is: 
     
         1 . An electric air pump for pumping air into an inflatable body, comprising:
 a housing comprising an air inlet and an air outlet;   an impeller disposed in the housing;   a motor configured to drive the impeller;   an air passage connecting the air inlet and the air outlet;   a first chamber receiving the motor and comprising a ventilation inlet and a ventilation outlet; and   a heat dissipation impeller configured to be driven by the motor so that air flows into the first chamber through the ventilation inlet and flows out of the first chamber through the ventilation outlet for heat dissipation of the motor.   
     
     
         2 . The electric air pump as claimed in  claim 1 , wherein the ventilation inlet and the ventilation outlet are disposed on two sides of the first chamber. 
     
     
         3 . The electric air pump as claimed in  claim 2 , further comprising a switching mechanism and a trigger switch, wherein the switching mechanism is disposed in the housing to pump air into the air passage, discharging air from the air passage, or closing the air passage, and the trigger switch is connected to the switching mechanism for starting or shutting down the motor. 
     
     
         4 . The electric air pump as claimed in  claim 3 , further comprising a second chamber and a spacing plate, wherein the switching mechanism comprises a knob disposed on a surface of the housing, a transmission rod configured to be rotated with the knob, and a switching element disposed in the second chamber and configured to be driven by the transmission rod to change air flow direction, the second chamber is disposed in the housing and comprises a right partition plate and a left partition plate, the right partition plate partitions the switching element and the impeller and has an upper through hole and a lower through hole, the left partition plate is disposed near the air outlet and has a left through hole connected to the air outlet, and the spacing plate is disposed between the motor and the impeller to form an upper space connected to the upper through hole and a lower space connected to the lower through hole. 
     
     
         5 . The electric air pump as claimed in  claim 4 , further comprising a rib disposed on the transmission rod, a transmission shaft movably extending through a through hole formed on the left partition plate, and a channel switching button fixed to the transmission shaft and comprising a transmission portion connected to the rib disposed on the transmission rod, wherein the switching element comprises a channel inclined between the left partition plate and the right partition plate, and a sliding plate disposed on an inner wall of the left partition plate and adjacent to the channel, a width of the channel is less than a distance between the upper through hole and the lower through hole and less than a height of the left through hole, the sliding plate is larger than the left through hole, the transmission rod is configured to drive the channel switching button to rotate about the transmission shaft through the rib and the transmission portion so as to rotate the switching element at a predetermined angle to connect the channel to the left through hole and the lower through hole. 
     
     
         6 . The electric air pump as claimed in  claim 5 , wherein the transmission rod comprises a protrusion configured to contact the trigger switch disposed near the protrusion. 
     
     
         7 . The electric air pump as claimed in  claim 5  further comprising a valve set disposed between the left through hole and the air outlet, a pressing plate disposed on the air outlet and covered by the valve set, a push rod disposed on a center of the pressing plate and extending towards the transmission rod, an elastic element disposed around the push rod to push the pressing plate to cover the air outlet, and two bosses disposed on the transmission rod, wherein the bosses push the push rod to open or close the air inlet through rotation of the transmission rod. 
     
     
         8 . The electric air pump as claimed in  claim 1 , wherein the housing is hermetically connected to the inflatable body, and the electric air pump further comprises a manual pressure relief valve disposed on an outer wall of the electric air pump and configured to discharge air from the inflatable body. 
     
     
         9 . The electric air pump as claimed in  claim 8 , wherein the manual pressure relief valve comprises a body fixed to the outer surface of the electric air pump, and the body comprises a vent, a valve deck plate covering the vent, a vertical rod disposed on a center of the valve deck plate and extending through the vent to protrude from the body, and a returning elastic element disposed around the vertical rod to push the valve deck plate to cover the vent. 
     
     
         10 . The electric air pump as claimed in  claim 1 , further comprising a manual exhausting handle, a power switch configured to start the motor, a venting hole formed on the manual exhausting handle and connected to the inflatable body through a hose, a regulating plate configured to cover the venting hole and comprising a pressing rod which extends through the manual exhausting handle to protrude from an outer surface of the manual exhausting handle, and a returning elastic element disposed around the pressing rod to push the regulating plate to cover the venting hole. 
     
     
         11 . The electric air pump as claimed in  claim 1 , wherein the first chamber and the air passage are separated. 
     
     
         12 . The electric air pump as claimed in  claim 1 , wherein the first chamber is connected to the air passage. 
     
     
         13 . The electric air pump as claimed in  claim 1 , wherein the ventilation outlet and the air outlet are separated.