JPH0712291Y2 - Ventilation valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is applied to an airtight container which is required to have a perfect sealing property against moisture in the outside air, and when the internal pressure of the container is increased or decreased, The present invention relates to a ventilation valve that discharges or inhales to maintain the internal pressure at the same level as the atmospheric pressure, and at the same time has a function of preventing the intrusion of water into the container.

(Prior Art) A thin film made of a tetrafluoroethylene resin material with a thickness of about 0.08 mm allows air to flow, but has a function of blocking the passage of water due to its water-repellent property. A ventilation valve that uses is used.

FIG. 3 shows an example of a vent valve of this kind, which is made of a synthetic resin material and has an outer case (11) with a vent hole (12), and an elastic case made of a rubber-like elastic material. O-ring (13) inserted in the inner step of (11),
A circular thin film made of a tetrafluoroethylene resin material, which has air permeability and water repellency, is attached to an O-ring (13), a filter (14), and a tetrafluoroethylene resin material that is substantially disc-shaped porous. Filters, made up of particles (14)
The filter supporting member (15) attached to the ring is made of a synthetic resin material into an annular body, and is inserted into the outer case (11) to sandwich the outer peripheral portion of the filter (14) with the O ring (13). In addition, the inner case (16) for accommodating the filter support member (15) and the set screw (17) for preventing the inner case (16) from falling off are provided by the screw attached to the outer periphery of the outer case (11). It is attached to the container (10).

The above-mentioned ventilation valve is assembled according to the following procedure.

Insert the O-ring (13) into the outer case (11), apply sealant to the end surface of the inner case (16), press fit the filter support member (15) into the recess of the inner case (16), and insert the filter (14). Attach to the end surface of the inner case (16), insert the inner case (16) into the outer case (11), and then insert the inner case (16).
Press to squeeze the O-ring (13), and then the outer case (11)
The inner case (16) and the inner case (16) are adhered to each other with an adhesive, a hole is formed through the outer case (11) to reach the inner case (16), a female screw is cut, and a set screw (17) is screwed in. Secure the set screw (17) with.

(Problems to be Solved by the Invention) Since the ventilation valve of the above-mentioned conventional example uses the filter (14) formed to be extremely thin, the outer case (11) that holds the filter (14) therebetween. Since it is not possible to use a screw coupling means for coupling the inner case (16) and the inner case (16), both the inner and outer cases (11) (16) are fixed by an adhesive, and a set screw (17) for preventing falling is added. Therefore, the assembly work is complicated and there is a risk of misassembly.

It is an object of the present invention to solve the above-mentioned problems, and to provide a ventilation valve that has a simple structure, is easy to assemble, and is free from erroneous assembly and falling out.

(Means for Solving the Problems) In view of the problems of the above-described conventional ventilation valve, the present invention has a substantially disc shape and is provided with an annular projection extending in the axial direction on the outer peripheral portion thereof. The protrusion is formed in an annular shape with an annular groove that opens in the axial direction and a cap that has a notch that communicates with the annular groove in the radial direction, and a water repellent material that has a large number of minute holes, and is inserted into the annular groove. And a packing that is inserted into the annular groove by sandwiching the breathable ring in the axial direction and is pressed by the attachment of the cap to the container.

(Operation) In the ventilation valve having the above-described configuration, the ventilation ring is made of a water-repellent material having a large number of micropores in an annular shape and is inserted into the annular groove provided on the outer peripheral portion of the disc-shaped cap. , Allows the flow of air between the inside of the container and the atmosphere side, and prevents the intrusion of water from the atmosphere side into the container.

(Example) Below, this invention is demonstrated based on the Example shown in figure. FIG. 1 shows a cross section of a ventilation valve and its mounting structure according to an embodiment of the present invention.

The schematic structure of this ventilation valve is a cap (1) as a main body.
A breathable ring (5) that allows the passage of air and blocks the passage of water, and between the cap (1) and the breathable ring (5) and between the breathable ring (5) and the container (10). It is a packing (6) for ensuring the sealing property and holding power.

The cap (1) is molded using an engineering plastic material such as polyacetal or polyamide,
It has a substantially disc shape, and an annular protrusion (2) extending in the axial direction is attached to the outer peripheral portion thereof, and the annular protrusion (2) communicates with the annular groove (3) opening in the axial direction and the annular groove (3). An inner and outer cutout (4) is formed.

Further, as shown in the bottom view of FIG. 2, the notch (4) is formed by shifting the positional relationship between the inside and the outside.

The breathable ring (5) is made of a ring of tetrafluoroethylene resin material having a large number of micropores having an average diameter of about 0.3 mm.

The packing (6) is annular like the breathable ring (5) and is made slightly thinner than the breathable ring (5).

Then, with the breathable ring (5), the two packings (6) are inserted into the annular groove (3) in a state where the breathable ring (5) is axially sandwiched, and the annular protrusion (2) is inserted into the container. It is attached to the container (10) by a mounting screw (7) penetrating the center of the cap (1) so as to surround the communication hole (9) formed in the (10).

When the pressure in the container (10) changes to cause a difference from the atmospheric pressure, the communication hole (9) of the container (10) and the annular protrusion (2)
The pressure inside the container (10) is maintained at the same level as the atmospheric pressure by the air flow through the notches (4) formed inside and outside and the minute holes of the breathable ring (5), and the container for moisture on the atmosphere side ( Entry into the inside of (10) is prevented by the water repellency of the breathable ring (5).

(Advantages of the Invention) The ventilation valve of the present invention has a substantially disc shape, and an annular protrusion extending in the axial direction is attached to the outer peripheral portion, and the annular protrusion has an annular groove opening in the axial direction and a diameter of the annular groove. And a breathable ring that is formed in an annular body by a water-repellent material having a large number of micropores and is inserted into the annular groove, and the breathable ring in the axial direction. By being sandwiched and inserted into the annular groove, and comprising a packing that is pressed by the attachment of the cap to the container,
It has a simple structure and is easy to manufacture and assemble.

In addition, since packing is provided on both sides of the breathable ring, it is easy to install, but it is possible to secure the sealing property with the object to be installed (for example, a closed container) and allow the passage of air. It also excels in its original function of blocking the passage of water (outflow from the inside of the container to the outside).

This is to prevent leakage even if the inside of the container is in a high pressure state and the breathable ring is deformed or displaced.

Furthermore, since the sealing property can be secured, it can be directly attached to the wall surface of the object to be attached, and in combination with the cap having the axial annular projection on the outer peripheral portion of the substantially disc shape, it can be formed thinly. , It requires less protrusion from the object to be mounted.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the same embodiment as seen from the back side, and FIG. 3 is a sectional view of an example of a conventional ventilation valve. 1 ... Cap, 2 ... Annular protrusion, 3 ... Annular groove, 4 ...
… Notches, 5… Breathable ring, 6… Packing, 7…
… Mounting screw, 9 …… Communication hole, 10 …… Container, 11 …… Outer case, 12 …… Ventilation hole, 13 …… O ring, 14 …… Filter, 15 …… Filter support member, 16 …… Inner case , 17 ...
… Set screws.

Claims (1)

[Scope of utility model registration request] 1. An annular projection (2) having a substantially disc shape and provided with an annular projection (2) extending in the axial direction on the outer peripheral portion of the annular projection (2) and an annular groove (3) opening in the axial direction. A cap (1) having a notch (4) in radial communication with (3).
And an air-permeable ring (5) made of a water-repellent material having a large number of micropores and inserted into the annular groove (3), and the air-permeable ring (5) being sandwiched in the axial direction. A packing (6) inserted into the annular groove (3) and pressed by the attachment of the cap (1) to the container (10).
Ventilation valve consisting of.