# US 2021/0345503 A1 · Ventilation housing

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- Number: US 2021/0345503 A1
- Document ID: US20210345503A1
- Status: Published application
- Kind: A1
- Application number: 17/283,157
- Filed: 2019-10-11
- Published: 2021-11-04
- Earliest claimed: 2018-10-11
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Daisuke KITAGAWA; Youzou YANO; Tomoyuki KASAGI
- Web page: https://patentgrep.com/patent/US20210345503A1

## CPC

- F16K 24/04: for venting only (F16K24/02 takes precedence)
- H05K 5/0216: {Venting plugs comprising semi-permeable membranes}
- F21S 45/30: Ventilation or drainage of lighting devices
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS

## Abstract

A ventilation housing of the present disclosure includes: a housing; and a ventilation assembly. The housing includes a tubular projection extending to project from an outer surface and internally having a first space communicating the inside and the outside of the housing. The ventilation assembly includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; a gas-permeable membrane covering the opening at the first end portion of the internal member; and an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side. The ventilation assembly is fixed to the projection with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other. The ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in the inside of the internal member, the inside of the external member, and/or an interspace between the two members. A ratio between an area S1 of a cross-section of the first space and a smallest total area S2min determined by comparison of values of different total areas determined at different distances from the gas-permeable membrane, the total areas each being determined for a cross-section(s) of the second space, is 1.0 or more. A ratio between the area S1 and a total area S2out of a plane consisting of a cross-section(s) of the second space taken at a position(s) where the second space is the narrowest is more than 1.0. This ventilation housing exhibits excellent performance in terms of moisture permeation between the inside and the outside of the housing.

## Claims

### Claim 1

A ventilation housing comprising:
a housing; and
a ventilation assembly, wherein
the housing comprises a tubular projection extending to project from an outer surface of the housing and internally having a first space communicating the inside and the outside of the housing,
the ventilation assembly comprises:
an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion;
a gas-permeable membrane covering the opening at the first end portion of the internal member; and
an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side,
the ventilation assembly is fixed to the projection with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other,
the ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in at least one selected from the inside of the internal member, the inside of the external member, and an interspace between the internal member and the external member joined together,
a ratio S2min/S1 between an area S1 of a cross-section of the first space taken along a plane perpendicular to a central axis of the projection and a smallest total area S2min determined by comparison of values of different total areas determined at different distances from the gas-permeable membrane is 1.0 or more, the total areas each being determined for a cross-section of the second space taken along a plane perpendicular to a ventilation direction in the ventilation path, the cross-section being located at a certain distance from the gas-permeable membrane, and
a ratio S2out/S1 between the area S1 of a cross-section of the first space taken along a plane perpendicular to a central axis of the projection and a total area S2out of a plane consisting of a cross-section of the second space taken at a position where the second space is the narrowest when the second space is observed from the second end portion side along a central axis of the ventilation assembly is more than 1.0.

### Claim 2 (depends on 2)

The ventilation housing according to claim 2, wherein a height H1 of the internal member is 6.0 mm or more and 10 mm or less.

### Claim 3 (depends on 1)

The ventilation housing according to claim 1, wherein the ratio S2out/S1 is 1.5 or more.

### Claim 4 (depends on 1)

The ventilation housing according to claim 1, wherein when the ventilation assembly is observed in a direction perpendicular to a central axis of the ventilation assembly, a length of a portion of the internal member in a direction along the central axis is 6.0 mm or more and 8.0 mm or less, the portion being covered by the external member.

### Claim 5 (depends on 1)

The ventilation housing according to claim 1, wherein the external member and/or the internal member has a locking mechanism detachably joining the external member and the internal member together.