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A seal structure is provided for an air conditioning unit mounted inside a passenger compartment of a vehicle and connected with pipes, which extends to the passenger compartment from an engine cabin through a pipe penetration opening of an isolation member. The seal structure includes an annular-sh

A seal structure is provided for an air conditioning unit mounted inside a passenger compartment of a vehicle and connected with pipes, which extends to the passenger compartment from an engine cabin through a pipe penetration opening of an isolation member. The seal structure includes an annular-shape pipe coupling wall formed at a case of the air conditioning unit and arranged at an outer side of a connection unit of the pipes, a first packing unit sandwiched between the pipe coupling wall and the connection unit, and a second packing unit between the isolation member and a front end of the pipe coupling wall. The second packing unit is bonded to both the first packing unit and the pipe coupling wall.

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What is claimed is: 1. A seal structure in combination with an air conditioning unit mounted inside a passenger compartment, the air conditioning unit being connected with pipes which extend into the passenger compartment from an outside area through a pipe penetration opening of a dashboard separa

What is claimed is: 1. A seal structure in combination with an air conditioning unit mounted inside a passenger compartment, the air conditioning unit being connected with pipes which extend into the passenger compartment from an outside area through a pipe penetration opening of a dashboard separating an engine compartment from the passenger compartment, the seal structure comprising: a pipe-coupling opening wall defined by a case of the air conditioning unit, the pipe-coupling opening wall being arranged in an annular shape; a first packing unit arranged between an inner surface of the pipe-coupling opening wall and an outer surface of a connection unit of the pipes; and a second packing unit arranged between the dashboard and an end of the pipe-coupling opening wall facing the dashboard; wherein the second packing unit is bonded directly to both the first packing unit and the pipe-coupling opening wall; and a bonding surface between the second packing unit and the pipe-coupling opening wall is co-planar with a bonding surface between the second packing unit and the first packing unit. 2. The seal structure according to claim 1, wherein: the first packing unit is made of a material having a higher watertightness capacity than that of the second packing unit; and the second packing unit is made of a material having a higher resilience capacity than that of the first packing unit. 3. The seal structure according to claim 2, wherein a clearance is formed between an outer surface of the first packing unit and the inner surface of the pipe-coupling opening wall. 4. The seal structure according to claim 1, wherein the first packing unit has an end surface which is arranged at a same plane with an end surface of the pipe-coupling opening wall, the end surfaces of the first packing unit and the pipe-coupling opening wall being at a side of the second packing unit. 5. The seal structure according to claim 1, wherein: the pipes are refrigerant pipes of a refrigerant cycle; and the connection unit is a block joint which connect the refrigerant pipes to refrigerant passages of an expansion valve of the air conditioning unit. 6. The seal structure according to claim 1, wherein: the first packing unit and the second packing unit overlap each other in such a manner that an outer surface of the first packing unit is disposed at an outer side with respect to an inner surface of the second packing unit and the inner surface of the second packing unit is disposed at the outer side with respect to an inner surface of the first packing unit. 7. The seal structure according to claim 1, wherein the second packing unit contacts the dashboard. 8. A seal structure in combination with an air conditioning unit mounted inside a passenger compartment, the air conditioning unit being connected with pipes which extend into the passenger compartment from an outside area through a pipe penetration opening of an isolation member, the seal structure comprising: a pipe-coupling opening wall arranged at the air conditioning unit, the pipe-coupling opening wall being arranged in an annular shape; a first packing unit arranged between an inner surface of the pipe-coupling opening wall and an outer surface of a connection unit of the pipes; a second packing unit arranged between the isolation member and an end of the pipe-coupling opening wall facing the isolation member; and a step wall arranged at the air conditioning unit and disposed at an opposite end of the pipe-coupling opening wall with respect to the isolation member, the step wall protruding from the inner surface of the pipe-coupling opening wall to an inner side thereof, wherein the second packing unit is bonded directly to both the first packing unit and the pipe-coupling opening wall; and the first packing unit is supported by the step wall, and has an inner surface bonded to the outer surface of the connection unit. 9. The seal structure according to claim 8, wherein the step wall has a rib, which is arranged at least at a lower side of the step wall to push the first packing unit against the second packing unit and push the second packing unit against the isolation member through the first packing unit. 10. The seal structure according to claim 9, wherein the rib protrudes from the step wall to the side of the isolation member. 11. A seal structure in combination with an air conditioning unit mounted inside a passenger compartment the air conditioning unit being connected with pipes which extend into the passenger compartment from an outside area through a penetration opening of an isolation member, the seal structure comprising: a pipe-coupling opening wall arranged at the air conditioning unit, the pipe-coupling opening wall being arranged in an annular shape; a first packing unit arranged between an inner surface of the pipe-coupling opening wall and an outer surface of a connection unit of the pipes: a second packing unit arranged between the isolation member and an end of the pipe-coupling opening wall facing the isolation member; and an outer wall arranged at the air conditioning unit and disposed at an outer side of the pipe-coupling opening wall, the outer wall being separated from the pipe-coupling opening wall; and a plurality of ribs integrated with at least one of the pipe-coupling opening wall and the outer wall and protruding into a space between the pipe-coupling opening wall and the outer wall, wherein the second packing unit is bonded directly to both the first packing unit and the pipe-coupling opening wall; and the second packing unit is further bonded to an end of the outer wall and ends of the ribs. 12. A seal structure in combination with an air conditioning unit mounted inside a passenger compartment, the air conditioning unit being connected with pipes which extend into the passenger compartment from an outside area through a pipe penetration opening of an isolation member, the seal structure comprising: a pipe-coupling opening wall arranged at the air conditioning unit, the pipe-coupling opening wall being arranged in an annular shape; a first packing unit arranged between an inner surface of the pipe-coupling opening wall and an outer surface of a connection unit of the pipes; and a second packing unit arranged between the isolation member and an end of the pipe-coupling opening wall facing the isolation member, wherein the second packing unit is bonded to both the first packing unit and the pipe-coupling opening wall, wherein: the inner surface of the first packing unit is disposed at an inner side with respect to an inner surface of the second packing unit, which is arranged along a rim portion of the pipe penetration opening of the isolation member; the first packing unit has two circumferential ends, which butt against each other on the outer surface of connection unit of the pipes to construct a butt portion; and the second packing unit has at least a convex portion, which protrudes from the inner surface thereof at a position corresponding to that of the butt portion to cover the butt portion in a vehicle front-rear direction. 13. The seal structure according to claim 12, wherein the convex portion has a triangular shape in a cross section perpendicular to a central axis of the second packing unit. 14. The seal structure according to claim 12, wherein the convex portion has a trapezoid shape in a cross section perpendicular to a central axis of the second packing unit. 15. The seal structure according to claim 12, wherein the second packing unit has a plurality of the convex portions which are symmetrically positioned.