Power converter

1. A power converter comprising:

a cooler that cools down an electronic component;

a casing comprising the cooler; and

a sealing member in a loop shape sealing a space between a sealing surface of the cooler and a sealing surface of the casing, wherein:

either one of the sealing surface of the cooler and the sealing surface of the casing is provided with a groove in a loop shape enabling the sealing member to be fitted therein;

a first positioning portion is provided on a bottom surface of the groove;

the sealing member comprises an internal sealing portion with a circular cross-section and located along the bottom surface of the groove, an external sealing portion with a circular cross-section and located so as to surround a looped outer circumference surface of the internal sealing portion, and a connected portion that connects the internal sealing portion to the external sealing portion across an entire circumference of the loop; and

the connected portion comprises a second positioning portion capable of being fitted in the first positioning portion.

2. The power converter according to claim 1 , wherein:

both surfaces of the connected portion are recessed backwardly relative to the respective sealing surfaces of the internal sealing portion and the external sealing portion; and

a space surrounded by the internal sealing portion, the external sealing portion, and the connected portion forms a drain passage enabling a leaked cooling medium from the internal sealing portion to pass therethrough.

3. The power converter according to claim 2 , wherein:

the first positioning portion comprises a protrusion protruding from the bottom surface of the groove toward an opening of the groove;

the protrusion has a drain hole capable of discharging the cooling medium trapped in the drain passage to an exterior of the casing; and

the second positioning portion is a through-hole enabling the protrusion to be fitted therein.

4. The power converter according to claim 2 , wherein:

the electronic component comprises a power module, and other electronic components that have a little amount of heat generation than the power module;

the cooler comprises a first cooling unit that cools down the power module and a second cooling unit that cools down the other electronic components;

a drain guide path runs through an interior of the casing, the drain guide path guiding a leaked cooling medium from between the first cooling unit and the casing;

the sealing member comprises a second cooling unit sealing member that seals a space between a sealing surface of the second cooling unit and a sealing surface of the casing;

the groove comprises a second cooling unit groove enabling the second cooling unit sealing member to be fitted therein;

the first positioning portion comprises a protrusion protruding from a bottom surface of the second cooling unit groove toward an opening of the groove;

the protrusion has a drain hole enabling the cooling medium guided from the drain guide path to flow in the drain passage of the second cooling unit sealing member; and

the second positioning portion is a through-hole enabling the protrusion to be fitted therein.

5. The power converter according to claim 1 , wherein:

the sealing member in the loop shape comprises an extended portion extended outwardly from an outer circumference surface of the loop or an inner circumference surface thereof; and

either one of the cooler and the casing has a recess enabling the extended portion to be fitted therein.

6. The power converter according to claim 1 , wherein at least a part of the cooler is integrally formed with the casing.