Fast inflating air pump

Abstract

The present invention discloses a fast inflating air pump, including a housing, an inflating tube, an inlet tube, a motor, a transmission assembly and a controller housed in the housing. A blower is arranged in the inlet tube for increasing air pressure to the inflating port. A piston is at least partially contained in the inflating tube, and the piston is driven by the motor via the transmission assembly so as to slide back and forth linearly for increasing air pressure in the inflating tube. A one-way valve is installed in the communicating pipe for only allowing air flow into the inflating tube. The controller instructs the motor to drive the piston to slide back and forth in the inflation tube on condition that the blower stops working until the air inflation pressure increases to a predetermined threshold, then the controller instructs the motor to stop operating.

1 . A fast inflating air pump comprising:
 a housing including an upper shell and a lower shell;   an inflating tube including an inflating port exposed on the outside of the housing, an inlet tube including an inlet port exposed on the outside of the housing for communicating with external air, a communicating pipe arranged between the inflating tube and the inlet tube for communicating with each other, a motor, a transmission assembly and a controller; and wherein   a blower is arranged in the inlet tube for increasing air pressure to the inflating port;   a piston is at least partially contained in the inflating tube, the piston is driven by the motor via the transmission assembly so as to slide back and forth linearly for increasing air pressure in inflating tube;   a one-way valve is installed in the communicating pipe for only allowing air flow into the inflating tube;   the controller instructs the blower to work until an air inflation pressure reaches a predetermined threshold, then the controller instructs the blower to stop working; the controller instructs the motor to drive the piston to slide back and forth in the inflation tube on condition that the blower stops working until the air inflation pressure increases to another predetermined threshold, then the controller instructs the motor to stop operating.   
     
     
         2 . The fast inflating air pump as described in  claim 1 , wherein the inflating tube includes a small-diameter section and a large-diameter section extending from the small-diameter section, a diameter of the large-diameter section larger than that of the small-diameter section, the inflation port is formed in the small-diameter section and the piston movably slides in the large diameter section of the inflating tube. 
     
     
         3 . The fast inflating air pump as described in  claim 1 , wherein the piston includes a head end, a tail end and a piston rod between the head end and the tail end. 
     
     
         4 . The fast inflating air pump as described in  claim 3 , wherein the transmission assembly includes a gear plate driven by the motor, an eccentric wheel, a rotating shaft located in the centre of the gear plate and connected to the eccentric wheel, and a transmission rod located on the eccentric wheel for connecting with the piston. 
     
     
         5 . The fast inflating air pump as described in  claim 4 , wherein the gear plate drives the eccentric wheel to rotate via the rotating shaft, and the eccentric wheel pushes or pulls the piston to slide via the transmission rod. 
     
     
         6 . The fast inflating air pump as described in  claim 4 , wherein the tail end of the piston includes a ring and a hole provided on the ring, and the transmission rod is sleeved in the ring. 
     
     
         7 . The fast inflating air pump as described in  claim 4 , wherein the gear plate has an external teeth provided on the outer periphery of the gear plate, the motor has a shaft with a transmission gear, and the external teeth of the gear plate meshes with the transmission gear of the motor. 
     
     
         8 . The fast inflating air pump as described in  claim 4 , wherein a valve plate mounted in the inflating tube is located above the head end of the piston for allowing air flow into the inflating port of the inflating tube only. 
     
     
         9 . The fast inflating air pump as described in  claim 8 , wherein the valve plate includes a rigid sheet with a plurality of holes, and a rubber sheet is attached to the rigid sheet for blocking the plurality of holes of the rigid sheet. 
     
     
         10 . The fast inflating air pump as described in  claim 8 , wherein the head end of the piston is in shape of a disc with a plurality of holes, and a damper is mounted on the head end and covers the plurality of holes of the head end. 
     
     
         11 . The fast inflating air pump as described in  claim 10 , wherein the head end further has an upper flange on the periphery of the disc, an upper flange on the periphery of the disc and a ring groove between the upper flange and the lower flange for mounting the damper. 
     
     
         12 . The fast inflating air pump as described in  claim 11 , wherein the damper has a central part for covering the he plurality of holes of the head end, two bridges extending from the central part along a direction far away each other, and an annular wall located on the outer peripheral side of the two bridges and connected to the two bridges. 
     
     
         13 . The fast inflating air pump as described in  claim 12 , wherein the annular wall has an inner wall extending from the two bridges, an outer wall extending from the inner wall and a groove provided between the inner wall and the outer wall. 
     
     
         14 . The fast inflating air pump as described in  claim 12 , wherein two notches are provided on the upper flange of the head end of the piston for matching the two bridges of the damper, respectively. 
     
     
         15 . The fast inflating air pump as described in  claim 10 , wherein an air chamber is formed by the valve plate, the head end with the damper and a part of the large-diameter section of the inflating tube. 
     
     
         16 . The fast inflating air pump as described in  claim 1 , wherein the controller is provided with a controlling circuit for controlling the operation of the air pump, and includes a power supply, a power switch, a controlling unit and two selecting switches, each of the two selecting switches has an input terminal connected with the power supply, an output terminal connected with the air pump, a ground terminal, and a controlling terminal connected with the controlling unit, the selecting switch includes a connecting terminal connected to the air pump, and the connecting terminal of the selecting switch is selectively connected to the input terminal or the ground terminal of the selecting switch according to an selecting signal from the controlling unit. 
     
     
         17 . The fast inflating air pump as described in  claim 16 , wherein each of the two selecting switches includes two field effect transistors with different conduction potentials, the two field effect transistors define a first field effect transistor and a second field effect transistor, a source or a drain of the first field effect transistor severed as the input terminal of the selecting switch, the drain or source of the first field effect transistor connected to a source or a drain of the second field effect transistor as the output terminal of the selecting switch, the drain or the source of the second field effect transistor served as the ground terminal of the selecting switch, a grids of the two field effect transistors connected as the controlling terminal of the selecting switch. 
     
     
         18 . The fast inflating air pump as described in  claim 17 , wherein the two field effect transistors are defined an N-channel field effect transistor or a P-channel field effect transistor. 
     
     
         19 . The fast inflating air pump as described in  claim 18 , wherein the controller includes a flip-flop and two triodes, a base of the two triodes are respectively connected to two output terminals of the flip-flop, a collector of the two triodes are respectively connected to the controlling terminals of the two selecting switches, and a emitter of the two triodes connected with the ground respectively, the flip-flop outputs a high and a low-level signal to make one of the two triodes turn on, and the other turns off.