Waterproof type control apparatus
An object is to prevent a water-repellent filter, which performs ventilation between the interior and the exterior of a sealed casing and prevents entry of water, from being wetted directly with water. A circuit board is sealed and housed in a casing including a base and a cover, a connector housing including a partition wall is mounted on the circuit board, and an electrical connection between the interior and the exterior of the casing is established. A water-repellent filter is fixed to an inner surface of the partition wall, and an outer surface portion of the water-repellent filter is opened to atmosphere via first and second ventilation holes and first and second connection ventilation holes. Therefore, the water-repellent filter can be avoided from being wetted directly with water.
1. A waterproof type control apparatus comprising:
a circuit board sealed and housed in a casing including a cover and a base having a mounting surface;
a connector housing which is a resin molded member mounted at one side of the circuit board and exposed from a side surface opening of the cover; and
a plurality of first connection terminals press-fitted into a partition wall of the connector housing, wherein
one end of each first connection terminal is connected to a circuit pattern of the circuit board, and another end of each first connection terminal is connected in a contact conductive manner to a second connection terminal provided within a mating connector, so that the waterproof type control apparatus is connected to a wire harness which is outside the casing,
the connector housing includes an inner annular peripheral wall provided at an inner side of the partition wall, and an outer annular peripheral wall which is provided at an outer side of the partition wall and to which the mating connector is fitted,
a waterproof packing for preventing water from entering an closed space including a contact conductive portion between each first connection terminal and each second connection terminal is provided between an end surface portion of the outer annular peripheral wall and the mating connector fitted to the outer annular peripheral wall,
a water-repellent filter which is a flat porous material including a plurality of fine pores which block entry and passing of water droplets into the casing and allow atmospheric air to freely pass therethrough is fixed in a close contact manner to an inner surface of the partition wall,
the water-repellent filter includes an inner surface portion communicating with an inner space of the casing and an outer surface portion communicating with a breath ventilation hole through which outside air is introduced,
the breath ventilation hole extends within a ventilation wall provided at a position at a side surface of the outer annular peripheral wall, in a direction penetrating the partition wall, is changed in direction to a direction to the mounting surface, which direction is parallel to the partition wall, or a direction opposite to the direction to the mounting surface by a connection ventilation hole, and is opened to atmosphere, and
a product in which the direction changed by the connection ventilation hole is the direction to the mounting surface or the direction opposite to the direction to the mounting surface is selected and used depending on a mounting environment of the base such that wetting directly with water through an atmospheric opening is unlikely to occur.
2. The waterproof type control apparatus according to claim 1 , wherein
the outer annular peripheral wall is a single outer annular peripheral wall or a division type outer annular peripheral wall divided into at least first and second annular peripheral walls,
the mating connector is also a single mating connector or a division type mating connector divided into at least first and second mating connectors,
if the first and second annular peripheral walls are included, the ventilation wall provided at the position at the side surface of the outer annular peripheral wall is provided at an intermediate position between the first and second annular peripheral walls, and
the ventilation wall is provided at a position away from an outer wall surface of the outer annular peripheral wall, or is provided at a position which is at a depth portion of the inserted mating connector and is away from an opening end of the outer annular peripheral wall, such that insertion of the mating connector is not hindered.
3. The waterproof type control apparatus according to claim 1 , wherein
the plurality of first connection terminals are arranged at a plurality of stages in a direction orthogonal to a board surface of the circuit board,
the breath ventilation hole includes a first ventilation hole and a second ventilation hole which are located in a vertical direction orthogonal to the board surface of the circuit board or a horizontal direction parallel to the board surface, and
ends of the first and second ventilation holes communicate with the outer surface portion of the water-repellent filter, and other ends of the first and second ventilation holes are orthogonally changed in direction via a first connection ventilation hole and a second connection ventilation hole and are opened to the atmosphere.
4. The waterproof type control apparatus according to claim 1 , wherein a throttling hole portion is provided such that a hole diameter of the connection ventilation hole is small at a position where the connection ventilation hole communicates with the breath ventilation hole to orthogonally change the direction of the breath ventilation hole.
5. The waterproof type control apparatus according to claim 4 , wherein the throttling hole portion is located eccentrically from a central position of the connection ventilation hole, and is located eccentrically in such a direction that a portion for accumulating poured water is widened, in response to a predetermined mounting inclination angle.
6. The waterproof type control apparatus according to claim 1 , wherein an inner surface of the outer annular peripheral wall is provided with a fine hole communicating with the inner space of the casing.
7. The waterproof type control apparatus according to claim 1 , wherein an opening end of the connection ventilation hole has an annular projection surface surrounding the connection ventilation hole, or the connection ventilation hole is exposed in a plateau plane portion located at a higher position than a surrounding portion.
8. The waterproof type control apparatus according to claim 7 , wherein
an annular projection for preventing outflow of a waterproof sealing material applied to an opening end surface of the cover and one side of the base is provided at a peripheral wall portion of the inner annular peripheral wall, and
the annular projection surface or the plateau plane portion is equal to or greater in height dimension than the annular projection and is connected and integrated with the annular projection.