Apparatus for injecting coolant for fuel cell vehicle

Abstract

An apparatus for injecting a coolant for a fuel cell vehicle is provided. More specifically, a coolant tank stores a coolant and a coolant pump, disposed in a coolant supply line connecting the coolant tank and the stack cooling loop is configured to pressure-transfer the coolant to the stack cooling loop, and circulating the coolant, which has passed through the stack cooling loop, to the coolant tank. A bubble elimination unit, disposed at a rear stage of the coolant pump in the coolant supply line, eliminates the bubbles in the fuel cell stack through vibration. This bubble elimination unit may be configured as an ultrasonic wave excitor for exciting the stack cooling loop with ultrasonic waves.

1 . An apparatus for injecting a coolant into a stack cooling loop for cooling a fuel cell stack in a fuel cell vehicle, the apparatus comprising:
 a coolant tank storing a coolant;   a coolant pump formed in a coolant supply line configured to connect the coolant tank and the stack cooling loop to pressure-transfer the coolant to the stack cooling loop, and circulate the coolant, which has passed through the stack cooling loop, to the coolant tank; and   a bubble elimination unit disposed at a rear stage of the coolant pump in the coolant supply line, the bubble elimination unit configured to eliminate bubbles in the fuel cell stack through vibration, wherein the bubble elimination unit is configured as an ultrasonic wave excitor for exciting the stack cooling loop with ultrasonic waves.   
     
     
         2 . The apparatus of  claim 1 , wherein the ultraviolet excitor is configured as a piezoelectric element or in a magnetic manner. 
     
     
         3 . The apparatus of  claim 1 , wherein the stack cooling loop and the coolant tank are connected through a first coolant circulation line, and the first coolant circulation line supplies bubbles, which are eliminated from the fuel cell stack, to the coolant tank. 
     
     
         4 . The apparatus of  claim 3 , wherein the coolant tank comprises a first outlet connected to the coolant supply line, a first inlet connected to the first coolant circulation line, and a bubble outlet for allowing the bubbles to be exhausted therethrough to the outside. 
     
     
         5 . The apparatus of  claim 1 , wherein a filter unit is installed at the rear stage of the coolant pump in the coolant supply line. 
     
     
         6 . The apparatus of  claim 5 , wherein the filter unit is configured as an ion eliminator charged with an ion exchange resin. 
     
     
         7 . The apparatus of  claim 1 , wherein a second outlet and a second inlet are formed at the cooling tank, the second outlet and the second inlet interconnected through a second coolant circulation line, and a filter pump and a filter unit installed within the second coolant circulation line. 
     
     
         8 . The apparatus of  claim 7 , wherein the filter unit is configured as an ion eliminator charged with an ion exchange resin. 
     
     
         9 . A method for injecting a coolant into a stack cooling loop for cooling a fuel cell stack in a fuel cell vehicle, the apparatus comprising:
 storing a coolant in a tank   pressure-transferring, by a first pump through a coolant supply line, the coolant to the stack cooling loop, and circulating the coolant by connecting the coolant tank and the stack cooling loop, the coolant having already passed through the stack cooling loop, to the coolant tank, wherein the coolant pump is formed in the coolant supply line;   eliminating bubbles in the fuel cell stack through vibration by a bubble elimination unit disposed at a rear stage of the coolant pump in the coolant supply line, wherein the bubble elimination unit is configured as an ultrasonic wave excitor for exciting the stack cooling loop with ultrasonic waves.   
     
     
         10 . The method of  claim 9 , wherein the ultraviolet excitor is configured as a piezoelectric element or in a magnetic manner. 
     
     
         11 . The method of  claim 9 , further comprising supplying bubbles through a first coolant circulation line which are eliminated from the fuel cell stack, to the coolant tank wherein the stack cooling loop and the coolant tank are connected through the first coolant circulation line. 
     
     
         12 . The method of  claim 11 , wherein the coolant tank includes a first outlet connected to the coolant supply line, a first inlet connected to the first coolant circulation line, and a bubble outlet for allowing the bubbles to be exhausted therethrough to the outside. 
     
     
         13 . The method of  claim 9 , wherein a filter unit is installed at the rear stage of the coolant pump in the coolant supply line. 
     
     
         14 . The method of  claim 13 , wherein the filter unit is configured as an ion eliminator charged with an ion exchange resin. 
     
     
         15 . The method of  claim 9 , wherein a second outlet and a second inlet are formed at the cooling tank, the second outlet and the second inlet interconnected through a second coolant circulation line, and a filter pump and a filter unit installed within the second coolant circulation line. 
     
     
         16 . The apparatus of  claim 15 , wherein the filter unit is configured as an ion eliminator charged with an ion exchange resin.