Ventilation member
A ventilation member is configured to be attached to an opening portion of a housing, and includes: an inner member configured to be fitted to the opening portion and including a tubular portion having a through hole configured to serve as a part of a ventilation path between a space inside the housing and a space outside the housing; and an outer member mounted to the inner member and covering a water-proof gas-permeable membrane attached so as to close an opening of the through hole. The inner member and the outer member have an exposed surface subjected to liquid-repellent treatment.
1. A ventilation member capable of being attached to an opening portion of a housing, the ventilation member comprising:
an inner member configured to be fitted to the opening portion and comprising a tubular portion having a through hole configured to serve as a part of a ventilation path between a space inside the housing and a space outside the housing;
an outer member mounted to the inner member and covering an opening of the through hole; and
an annular sealing member mounted so as to be placed around the opening portion in a clearance between the inner member and the housing,
wherein the inner member, the outer member, and the sealing member are each individually treated with liquid-repellent treatment,
exposed entire outer surfaces of the inner member, the outer member and the sealing member are coated with a first oil-repellent film formed by the liquid-repellent treatment,
the outer member is a tubular member having a bottom, and
the outer member and the sealing member are mounted to the inner member so that portions of the inner member, the outer member, and the sealing member treated with the liquid-repellent treatment are fitted together repellent treatment are fitted together,
wherein unexposed outer surfaces of the inner member, the outer member and the sealing member are coated with a second oil-repellent film formed by liquid-repellent treatment,
the second oil-repellent film includes a first portion that coats the inner member, a second portion that coats the outer member, and a third portion that coats the sealing member, and
the first portion is in contact with the second portion and the third portion.
2. The ventilation member according to claim 1 , further comprising a water-proof gas-permeable membrane attached so as to close an opening of the through hole, the water-proof gas-permeable membrane having an exposed surface treated with liquid-repellent treatment.
3. The ventilation member according to claim 1 , further comprising:
a communication path between the inner member and the outer member, the communication path being configured to communicate with a second opening portion and the space outside the housing and to serve as a part of the ventilation path,
wherein the through hole has a first opening portion configured to communicate with the space inside the housing, and the second opening portion configured to communicate with the space outside the housing.
4. The ventilation member according to claim 1 , wherein the outer member is formed of a resin.
5. The ventilation member according to claim 1 , wherein the inner member is formed of an elastomer.
6. The ventilation member according to claim 1 , wherein the sealing member is formed of an elastomer.
7. A ventilation structure, comprising:
the ventilation member according to claim 1 ; and
a housing having an opening portion,
wherein:
the ventilation member is attached to the opening portion of the housing,
the inner member of the ventilation member is fitted to the opening portion, and
the sealing member of the ventilation member is placed around the opening portion in a clearance between the inner member and the housing.
8. The ventilation structure according to claim 7 , wherein
a portion of the first oil-repellent film that covers the sealing member is in contact with the housing.