Condensate trap for gas furnace

1. A condensate trap for a gas furnace for collecting and discharging condensate generated in a heat exchanger and an exhaust pipe, the condensate trap comprising:

a first inlet through which the condensate generated in the heat exchanger is introduced;

a second inlet through which the condensate generated in the exhaust pipe is introduced;

a first passage through which the condensate introduced from the first inlet passes;

a second passage through which the condensate introduced from the second inlet passes;

a discharge port through which the condensate, having passed through the first passage and the second passage, is discharged outside; and

a backflow prevention device disposed on the first passage and configured to prevent backflow of air, wherein the backflow prevention device comprises:

a housing; and

a core which is movably disposed in the housing, and which in response to an amount of the condensate introduced from the first inlet being less than or equal to a predetermined amount, prevents backflow of the air by closing the first passage, wherein the housing comprises:

a housing body having a tubular shape and a through hole formed in a vertical direction; and

upper and lower stoppers protruding radially inward of upper and lower portions of the housing body, respectively, so as to limit upward and downward movements of the core, wherein the core comprises:

a core head coming into contact with the upper stopper to close the through hole; and

a core body disposed below the core head and having a bottom surface coming into contact with the lower stopper, wherein the core body comprises a hollow portion with a closed upper part and an open lower part, wherein at least one body hole is formed on the core body, so that the condensate introduced from the first inlet passes through the hollow portion of the core body.

2. The condensate trap of claim 1 , wherein the respective upper and lower stoppers have rounded inner surfaces.

3. The condensate trap of claim 1 , wherein the core head has an upper surface having a flat plate shape.

4. The condensate trap of claim 1 , wherein the at least one body hole is formed on a side surface of the core body.

5. The condensate trap of claim 1 , wherein an outer surface of the core is spaced apart by a predetermined distance from an inner surface of the housing.

6. The condensate trap of claim 1 , further comprising upper and lower fixing parts protruding inwardly of the first passage, wherein the housing is detachably installed between the upper and lower fixing parts.

7. The condensate trap of claim 1 , further comprising a cover having the discharge port formed on one side.

8. The condensate trap of claim 1 , wherein density of the core is higher than density of the condensate generated in the heat exchanger and the exhaust pipe.