JP2009043888A - Ventilation device - Google Patents

Abstract

A ventilation device attached to a ventilation hole provided in a part of a container requiring ventilation, wherein an elastic body is interposed between the inner ventilation hole and the outer ventilation hole, thereby allowing the outer ventilation hole to be inserted. A venting device capable of preventing water from entering the inside of the container is provided by blocking the inner vent hole by elastically deforming the water that has entered from the inside by pressing the elastic body.
A venting device is a venting device that is attached to a vent hole provided in a part of a container that requires venting, an inner cylinder having an inner vent hole on a side surface, and the inner vent hole. An outer cylinder provided with an outer ventilation hole at a position where the inner cylinder and the outer ventilation hole have a predetermined gap, and the inner cylinder is arranged on the inner side and the outer cylinder is arranged on the outer side. The elastic body having a size for closing the hole is disposed between the inner ventilation hole and the outer ventilation hole with a gap therebetween.
[Selection] Figure 2

Description

  The present invention relates to a ventilation device, and more particularly to a ventilation device in which a ventilation device provided in a container that needs ventilation is provided with a waterproof structure.

  FIG. 5 shows a ventilation device 110 for ventilating the inside of the sensor unit terminal box 112 of the vortex flowmeter with the outside air.

  FIG. 5 shows a sensor device terminal box 112 of a vortex flowmeter with a ventilation device 110 attached. A vent hole 113 is formed in a part of the sensor terminal box 112 attached to the terminal box 111. A sintered metal filter 114 is attached to the vent hole 113, a plug 116 is inserted from the outside through a spacer 115, and a press-fitting plate 118 having a vent hole 117 is provided outside the plug 116. .

In the ventilation device 110 having such a configuration, outside air is normally taken in from outside through the ventilation hole 117 and outside air that has passed through the sintered metal filter 114 passes through the ventilation hole 113 and is taken into the sensor unit terminal box 112. It is.
Japanese Patent Laid-Open No. 2001-7560 (page 3, FIG. 1)

However, when a large amount of water is applied to the terminal box including the sensor unit described in the related art, there is a problem that water may enter from the vent hole and enter the sensor unit of the terminal box.
Therefore, the ventilation structure provided with the waterproof structure which does not immerse with respect to a large amount of water discharge is provided.

  In order to solve the above problems, the venting device of the present invention has the following configuration.

(1) The ventilation device is a ventilation device attached to a ventilation hole provided in a part of a container requiring ventilation, and is opposed to the inner cylinder having an inner ventilation hole on a side surface and the inner ventilation hole. An outer cylinder provided with an outer vent hole at a position, the inner cylinder facing inward and the outer cylinder facing outward so that the inner vent hole and the outer vent hole have a predetermined gap; The elastic body having such a size as to close the gap is disposed between the inner ventilation hole and the outer ventilation hole with a gap therebetween.
(2) The ventilation device according to (1), wherein the elastic body is a sealing component such as silicone resin.

  In the present invention, by inserting an elastic body between the inner ventilation hole and the outer ventilation hole, water that has entered from the outer ventilation hole is elastically deformed by pressing the elastic body, thereby closing the inner ventilation hole. Thus, it is possible to prevent water from entering the container.

  Next, an embodiment of the ventilation device according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the venting device of the present invention is a part of a sensor unit terminal box 12 attached to a terminal box 11 formed by aluminum die casting, which is a container that requires ventilation. A ventilation hole 13 is formed in the ventilation hole 13 and a ventilation device 14 is provided in the ventilation hole 13.

  The ventilation device 14 is provided with a metal case 16 corresponding to an inner cylinder formed in a cylindrical shape having an inner ventilation hole 15 on a side surface, and an outer ventilation hole 17 provided at a position facing the inner ventilation hole 15, and corresponds to an outer cylinder. The metal cover 18 is provided with the outer vent hole 17 of the metal cover 18 inside the portion provided with the inner vent hole 15 of the metal case 16 so that the inner vent hole 15 and the outer vent hole 17 have a predetermined gap. Place it on the outside.

An elastic body sized to block the inner ventilation hole 15, in the embodiment, a silicon rubber 19, which is a sealing part such as silicone resin, is provided between the inner ventilation hole 15 and the outer ventilation hole 17 with a gap between them. The configuration is arranged. The silicon rubber 19 is fixed by a silicon rubber fixing ring 21 provided at a lower position of the metal case 16.

A filter housing part 23 for housing the sintered metal filter 22 is provided in the upper part of the metal case 16, and the sintered metal filter 22 is housed in the filter housing part 23 and covered.
A water extraction hole 24 is provided at a substantially central position at the bottom of the metal cover 18 so that water that has entered through the outer ventilation hole 17 can be removed.

  In the ventilation device having such a configuration, during normal ventilation, as shown by the dotted line in FIG. 2, external air passes through the outer ventilation hole 17 and the gap between the silicon rubber 19 and the metal cover (outer cylinder) 18. The sensor part passes through the gap between the silicon rubber 19 and the metal case (inner cylinder) 16 in the direction of the inner ventilation hole 15, passes through the inner ventilation hole 15, passes through the path of the sintered metal filter 22, passes through the ventilation hole 13. It is taken into the terminal box 12.

On the other hand, the operation when water is applied to the ventilation device will be described with reference to FIGS.
FIG. 3 is a cross-sectional view when cut along a cross section including the central axes of the inner and outer vent holes 15 and 17 and shows a normal state where no water is applied. There is a gap between the outer periphery of the metal case 16 having the inner ventilation hole 15 and the silicon rubber 19, so that ventilation is possible.

  FIG. 4 shows a cross-sectional state when water is discharged from a certain direction. When water passes through the outer vent hole 17 and water pressure is applied to the silicon rubber 19, the silicon rubber 19 is deformed and contacts the outer periphery of the metal case 16 to close the inner vent hole 15. Waterproofing is possible by the deformation of the silicon rubber 19 due to the water pressure. The water that has entered the outer periphery of the metal case 16 of the ventilation device is drained from a water drain hole 24 (see FIG. 2) opened in the bottom surface of the metal cover 18.

It is explanatory drawing which shows the coupling | bonding of the ventilation apparatus and terminal box of this invention. It is explanatory drawing which expanded and showed the ventilation apparatus of this invention. It is sectional drawing at the time of cutting in the cross section containing the central axis of the vent hole of this invention. In FIG. 3, it is sectional drawing which shows a deformation | transformation of an elastic body when receiving water discharge from one direction. It is explanatory drawing which showed the ventilation apparatus in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Terminal box 12 Sensor part terminal box 13 Ventilation hole 14 Ventilation device 15 Inner ventilation hole 16 Metal case (inner cylinder)
17 Outer ventilation hole 18 Metal cover (outer cylinder)
19 Silicon rubber (elastic body)
21 Silicon rubber fixing ring 22 Sintered metal filter 23 Filter housing part 24 Drain hole

Claims (2)

A venting device attached to a vent hole provided in a part of a container requiring ventilation,
An inner cylinder having an inner vent hole on a side surface and an outer cylinder having an outer vent hole at a position facing the inner vent hole, and the inner vent hole and the outer vent hole have a predetermined gap. Place the inner cylinder on the inside and the outer cylinder on the outside,
A venting device, wherein an elastic body having a size for closing the inner vent hole is disposed between the inner vent hole and the outer vent hole with a gap therebetween.   The ventilation device according to claim 1, wherein the elastic body is a sealing component such as silicon resin.

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