Pump

Abstract

A pump for boosting and transporting a liquid, includes a housing, a gear rotor device, at least one cover and a motor. A transportation chamber is defined in the housing. An inlet and an outlet are defined in the housing and respectively in communication with the transportation chamber. The gear rotor device is received in the transportation chamber. The gear rotor device includes first and second gears meshing with each other. The at least one cover covers and seals at least one side of the housing. The motor is mounted on one cover with a shaft thereof rotatably connecting with one of the first and second gears. Through a full compression by the gear rotor device, the liquid transportation is in a positive displacement and the liquid is pressurized by the gear rotor device whereby the pump has high head and therefore efficiently transports the liquid.

1 . A pump for boosting and transporting a liquid, comprising: 
 a housing, transportation chamber being defined in the housing, an inlet and an outlet being defined in the housing and respectively in communication with the transportation chamber;    a gear rotor device received in the transportation chamber, the gear rotor device comprising first and second gears meshing with each other;    at least one cover covering and sealing at least one side of the housing; and    a motor mounted on one cover with a shaft thereof rotatably connecting with one of the first and second gears;    Wherein through a full compression by the gear rotor device, the liquid transportation is in positive displacement and the liquid is pressurized by the gear rotor device whereby the pump has high head and therefore efficiently transports the liquid.    
   
   
       2 . The pump as claimed in  claim 1 , wherein the meshing first and second gears are spur gears or helical gears.  
   
   
       3 . The pump as claimed in  claim 1 , wherein the transportation chamber has two cavities with same diameters.  
   
   
       4 . The pump as claimed in  claim 3 , wherein the inlet is connected with a side wall of the transportation chamber which is formed along a beeline between two points of tangencies of the largest meshing rotor circles of the first and second gears, whereby the liquid is drawn smoothly during the meshing rotation of the first and second gears for preventing from incompletely suction thereby preventing cavitation.  
   
   
       5 . The pump as claimed in  claim 1 , wherein the transportation chamber has two cavities with different diameters and in communication with each other, that's, diameters of pitch circles of the meshing gears are different, the gear rotatably connecting with the motor has a relatively large diameter and a relatively great amount of gear teeth and drives the other gear as a gearwheel drives a pinion thereby increasing a transportation rate of the liquid and a rotation speed of the other gear.  
   
   
       6 . The pump as claimed in  claim 5 , wherein the inlet and the outlet are mounted with different arrangements by axis and longitude on the transportation chamber.  
   
   
       7 . The pump as claimed in  claim 6 , wherein a nozzle is further connected with the outlet for providing a spraying function.  
   
   
       8 . The pump as claimed in  claim 7 , wherein the transportation chamber is defined through the housing, first and second covers respectively cover upper and lower sides of the housing thereby sealing the transportation chamber and positioning the first and second gears within the transportation chamber.