Integrated hydrogen recirculation blower for fuel cell vehicle

1. An integrated hydrogen recirculation blower for a fuel cell vehicle, the integrated hydrogen recirculation blower comprising:

a blower having a blower housing including an inlet and an outlet formed on a top surface thereof, wherein the inlet includes a first inlet through which new hydrogen is introduced from a hydrogen tank and a second inlet through which recirculated hydrogen is introduced from a stack outlet, wherein the first and second inlets are in parallel to each other;

an impeller rotatably installed inside the blower housing;

a motor connected to a rear end of the impeller to rotate the impeller;

an ejector formed integrally on and extending from the top surface of the blower housing; and

a controller configured to operate the motor in an adjustable manner depending on a level of power output required by the fuel cell vehicle.

2. The integrated hydrogen recirculation blower of claim 1 , wherein the blower housing comprises an upper housing and a lower housing, in which the first and second inlets and the outlet are formed on the upper housing.

3. The integrated hydrogen recirculation blower of claim 2 , wherein the first and second inlets and the outlet are formed in parallel to each other.

4. The integrated hydrogen recirculation blower of claim 3 , wherein the upper housing includes a substantially semicircular groove which is formed in the circumferential direction on an inside edge of the upper housing, one end of the groove being in fluid communication with the second inlet whilst the other end of the groove is in fluid communication with the outlet, whereby the recirculated hydrogen introduced through the second inlet moves along the groove and eventually is discharged through the outlet.

5. The integrated hydrogen recirculation blower of claim 4 , wherein the ejector includes a large diameter portion including a first end extending upwardly from the top surface of the blower housing and a small diameter portion extending from a second end of the large diameter portion,

wherein the large diameter portion is furnished with a first connecting passage extending from a bottom at a center of the large diameter portion, which is in communication with the first inlet, and a second connecting passage formed on the outside of the first connecting passage, which is in communication with the second inlet,

wherein the small diameter portion comprises an ejector outlet formed within the small diameter portion, which ejector outlet is connected to the first connecting passage and the second connecting passage at the second end of the large diameter portion where the first connecting passage and the second connecting passage are converged together, and

wherein a check valve is provided in a connecting line connecting the second inlet and the second connecting passage.

6. The integrated hydrogen recirculation blower of claim 5 , wherein at a low output power, the check valve shuts off the second inlet and the second connecting passage to prevent the recirculated hydrogen from being introduced to the ejector so that the recirculated hydrogen is introduced through the second inlet, moved along the semicircular groove, and discharged through the outlet, and the new hydrogen is introduced through the first inlet and discharged through the first connecting passage and the ejector outlet.

7. The integrated hydrogen recirculation blower of claim 5 , wherein at a high output power, the check valve connects the second inlet and the second connecting passage so that the recirculated hydrogen is discharged through the second connecting passage and the ejector outlet and, at the same time, introduced through the second inlet, moved along the semicircular groove, and discharged through the outlet, and the new hydrogen is introduced through the first inlet and discharged through the first connecting passage and the ejector outlet.

8. An integrated hydrogen recirculation blower for a fuel cell vehicle, the integrated hydrogen recirculation blower comprising:

a blower having a blower housing including an inlet and an outlet formed on a top surface thereof;

an impeller rotatably installed inside the blower housing;

a motor connected to a rear end of the impeller to rotate the blower housing;

an ejector formed integrally on the top surface of the blower housing wherein the integrated hydrogen recirculation blower is configured so that both the blower and the ejector are operated when a first level of power is required, while only the blower is operated when a second level of power is required.