Air cleaner and fuel cell system including the same

1. An air cleaner comprising:

a body disposed inside a stack case which stores a fuel cell stack, and having an upper portion detachably coupled to a top plate of the stack case; and

a filter disposed inside the body to filter air introduced into the body,

wherein the body further includes:

an external inlet port configured to introduce external air to be supplied to the stack case from an outside of the stack case; and

a stack introducing passage configured to introduce air discharged from the fuel cell stack, and

wherein the stack introducing passage includes:

a main fluid passage extending through the center of a stack introducing pipe protruding out of the body; and

a guide groove recessed into an inner surface of the stack introducing pipe.

2. The air cleaner of claim 1 , wherein

the guide groove is configured to guide air, which is introduced into the main fluid passage, to flow in a reference direction while rotating about a specific axis extending in the reference direction, where the reference direction is a direction to introduce the air into the main fluid passage.

3. The air cleaner of claim 2 , wherein the guide groove has a spiral form extending in the reference direction.

4. The air cleaner of claim 2 , wherein the stack introducing passage further includes:

a blocking member protruding inwardly from a part, which is adjacent to an end of the guide groove facing the reference direction, of the inner surface of the stack introducing pipe, and configured to block moisture, which is introduced into the guide groove, from moving into the body by centrifugal force.

5. The air cleaner of claim 4 , wherein the stack introducing passage further includes:

a discharge hole extending through the guide groove to discharge moisture, which is introduced into the guide groove, out of the stack introducing pipe.

6. The air cleaner of claim 2 , wherein the main fluid passage has an inner diameter gradually reduced in the reference direction.

7. The air cleaner of claim 1 , further comprising

a duct connected to the lower portion of the body, and configured to discharge the air passing through the filter.

8. An air cleaner comprising:

a body disposed inside a stack case which stores a fuel cell stack, and having an upper portion detachably coupled to a top plate of the stack case; and

a filter disposed inside the body to filter air introduced into the body,

wherein the body further includes:

an external inlet port configured to introduce external air to be supplied to the stack case from an outside of the stack case, and

wherein the body further includes:

a lower body having a lower portion connected to a duct to discharge the air passing through the filter; and

an upper body detachably coupled to the lower body to receive the filter in a space defined between the upper body and the lower body.

9. The air cleaner of claim 8 , wherein the upper body includes:

an upper case having an upper portion having an opening; and

a cover part disposed on the upper case to cover the opening of the upper case and having the external inlet port.

10. The air cleaner of claim 9 , wherein the upper body further includes:

a connecting member coupled to the upper portion of the upper case and the cover part.

11. The air cleaner of claim 10 , wherein the cover part includes a first hole, which is formed by cutting a first region of the top plate of the stack case, to form a continuous surface with the top plate.

12. The air cleaner of claim 11 , wherein the cover part is derived from the first region.

13. The air cleaner of claim 8 , wherein the body further includes:

a first coupling part disposed in the lower body; and

a second coupling part disposed in the upper body, and detachably coupled to the first coupling part.

14. A fuel cell system comprising:

a stack case disposed under a seat of a vehicle to store a fuel cell stack; and

an air cleaner inserted into the stack case, having an upper portion coupled to a top plate of the stack case, and including a stack introducing passage configured to introduce air discharged from the fuel cell stack, and an external inlet port configured to introduce external air,

wherein the stack case and the seat of the vehicle are spaced apart from each other by a specific distance in a vertical direction to form a space,

wherein the external inlet port is disposed in an upper portion of the air cleaner and disposed in the top plate of the stack case, and

wherein the external air is guided to the top plate of the stack case through the space to be introduced into the air cleaner through the external inlet port.