JPH0656574U - Ventilation valve - Google Patents

Abstract

(57) [Summary] [Purpose] A structure that is easy to manufacture and handle using a material that has low cost and high strength. [Structure] A valve body 1 mounted in a closed container is provided with a ventilation hole including an axial hole 2, a radial hole 3 and a circumferential groove 4, and a step portion 5 is provided so as to sandwich the circumferential groove 4 for ventilation. The substantially cylindrical ventilation member 6 having water-repellent property and water repellency is fitted to the step portion,
The outer peripheral surface of the ventilation member 7 is covered with a cylindrical holding tube 7 made of a material having heat shrinkability and water repellency,
Alternatively, a fine vertical groove 8 connected to the circumferential groove 4 which is a part of the ventilation channel is arranged on the circumferential surface of the valve body 1, and is made into a cylindrical shape with a material having heat shrinkability and water repellency. 9
The fine vertical groove 8 is covered with the structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vent valve used in a closed container for containing a liquid, for keeping the internal pressure at the same pressure as the atmospheric pressure and preventing dust and water from entering from the outside.

[0002]

[Prior art]

 For example, in an airtight container containing a liquid such as a fuel tank of an automobile, in order to prevent a change in the internal pressure due to an increase or decrease in the amount of the contained liquid, the inside and outside of the container are connected to move air. A vent valve is used to free the. The ventilation valve described above must have a function of blocking the intrusion of dust and water from the outside, so it is made of a material with breathability and water repellency to be made into an extremely thin membrane. It is known that such a filter is supported by a reinforcing member made of a material having air permeability and rigidity.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional ventilation valve has a structure in which a filter made of a thin film-like body made of a material having air permeability and water repellency is supported by a reinforcing member, and therefore it is expensive to manufacture a filter. Not only was the cost of the material high, but the complexity of the assembly process was inevitable.

[0004]

[Means for solving problems]

 The present invention has been made in consideration of the problems in the above-described conventional ventilation valve, and has the following configuration. The valve body, which has a substantially columnar shape and is mounted in a closed container, has an axial hole that opens to the inside of the closed container, a radial hole that is continuous with the axial hole, and a circumferential direction that connects to the radial hole. A ventilation member is formed in a substantially cylindrical shape by using a porous PTFE material having air permeability and water repellency on the step portion formed by forming a groove to form a ventilation channel and sandwiching the circumferential groove. The outer peripheral surface of the ventilation member is covered with a cylindrical holding tube made of a material having heat shrinkability and water repellency, which is fitted to the stepped portion, or is formed as a part of the ventilation channel. A fine vertical groove connected to the directional groove is provided on the peripheral surface of the valve body, and the fine vertical groove is covered by a cylindrical cover made of a material having heat shrinkability and water repellency.

A polyacetal resin, a polyamide resin, a PTFE resin, or the like is used as a material for manufacturing the valve body, and a holding cylinder and a fine vertical groove provided with a ventilation member made of a porous PTFE material are provided. For the material of the cover that covers the peripheral surface of the valve body, for example, FEP (ethylene tetrafluoride-propylene hexafluoride copolymer resin) or PTFE (ethylene tetrafluoride resin) is used.

[0006]

[Action]

 In the vent valve according to the present invention having the above-mentioned structure, the vent passage provided in the valve body and the vent member made of porous PTFE are combined, or the vent provided in the valve body is combined. The combination of the flow channel and minute vertical grooves arranged on the peripheral surface of the valve body allows the flow of air through the inside and outside of the closed container, and the holding member or cover made of a water repellent material completely prevents the intrusion of dust and water. Block to.

[0007]

【Example】

 In the embodiment shown in FIG. 1, a valve body 1 having a substantially cylindrical shape is connected to an axial hole 2 which opens to the inside of a closed container, a radial hole 3 which is continuous with the axial hole 2 and a radial hole 3. The ventilation groove is formed by the circumferential groove 4, and the stepped portion 5 formed by sandwiching the circumferential groove 4 is made of a porous PTFE having air permeability and water repellency and made into a substantially cylindrical shape. The outer peripheral surface of the ventilation member 6 is covered with a holding cylinder 7 having a cylindrical shape and made of a material having heat shrinkability and water repellency.

Also in the embodiment shown in FIG. 2, an air passage is formed by the axial hole 2, the radial hole 3 and the circumferential groove 4, and is connected to the circumferential groove 4 on the circumferential surface of the valve body 1. The fine vertical grooves 8 are arranged, and a cylindrical cover 9 made of a material having heat shrinkability and water repellency covers the fine vertical grooves 8.

[0009]

[Effect of device]

 As described above, the vent valve according to the present invention has a step formed with a circumferential groove sandwiched in a valve body in which a vent passage including an axial hole, a radial hole and a circumferential groove is formed. Is a substantially cylindrical ventilation member having air permeability and water repellency fitted into the step portion, and a cylindrical holding tube made of a material having heat shrinkability and water repellency is coated on the outer peripheral surface of the ventilation member? Alternatively, a fine vertical groove that is connected to the circumferential groove that is a part of the ventilation channel is provided on the circumferential surface of the valve body, and is made into a cylindrical shape with a material having heat shrinkability and water repellency. Due to the structure in which the fine vertical grooves are covered, the combination of the ventilation passage provided in the valve body with the ventilation member made of porous PTFE, or the ventilation provided in the valve body Fine vertical grooves arranged on the flow passage and the peripheral surface of the valve body Combination allows the flow of air through the inside and outside of the closed container to keep the pressure inside the container at the same pressure as the atmospheric pressure, and the holding member or cover made of a water-repellent material completely blocks the ingress of dust and water. Show. .

[0010]

[Brief description of drawings]

1 and 2 are cross-sectional views of an embodiment of the present invention.

[Explanation of symbols]

 1 Valve Main Body 2 Axial Hole 3 Radial Hole 4 Circumferential Groove 5 Step 6 Vent Member 7 Holding Tube 8 Fine Vertical Groove 9 Cover

Claims (2)

[Scope of utility model registration request] 1. An axial hole (2) having a substantially columnar shape and opening to the closed container side, a radial hole (3) continuous with the axial hole (2), and connected to the radial hole (3). And a valve body (1) having a circumferential groove (4) and a step (5) formed by sandwiching the circumferential groove (4), and a porous PTFE having air permeability and water repellency. A ventilation member (6) having a substantially cylindrical shape and fitted into the step portion (5);
A ventilation valve having a cylindrical shape made of a material having heat shrinkability and water repellency, and having a holding cylinder (7) coated on the outer peripheral surface of the ventilation member (6). 2. An axial hole (2) having a substantially columnar shape and opening inside a closed container, a radial hole (3) continuous with the axial hole (2), and connected to the radial hole (3). A valve body (1) having a circumferential groove (4) and a fine vertical groove (8) connected to the circumferential groove (4), and a material having heat shrinkability and water repellency, which are formed into a cylindrical shape, A vent valve having a cover (9) covering the fine flutes (8).