JP2000142772A - Pressure relief device for sealing liquid container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure relief device for a sealing liquid container which is inexpensive and compact in size while being excellent in airtightness and free from leakage of liquid. SOLUTION: For this pressure relief device, an air hole 7 connecting a gaseous phase part inside a container with the outside of the container is provided with the end edge of an opening at the exterior side thereof projected in a protuberant shape to form a cap mouting part 11, and a cap 12 in an indented shape made up of an elastic material is fitted to the cap mounting part 11 so that a sealing surface is formed of an inner circumferential side wall of the cap 12 and an outer circumferential side wall of the cap mounting part 11, and a filter 8 for letting gas only pass therethrough while intercepting liquid is mounted so as to cover an opening at the air hole 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure relief device for a container, and more particularly, to exhausting the container in order to prevent the container from being damaged due to an increase in the internal pressure of the container due to the generation of gas from the filled liquid. Also, the present invention relates to a pressure relief device for a liquid hermetic container requiring airtightness.

[0002]

2. Description of the Related Art Conventionally, as this kind of pressure relief device,
As shown in FIG. 1, a stopper 2 movable by a spring 3 is fitted into an opening of the vent 1 on the outside of the container, and when the pressure inside the container reaches a certain pressure, the stopper 2 is moved. A configuration in which the air is pushed up to the outside of the container and exhausted is generally used.

[0003]

In this conventional pressure relief device, there is a danger that the liquid inside the container will leak to the outside simultaneously with the evacuation. Further, since a spring or the like is used, the pressure relief device is complicated. And a large structure, resulting in an expensive structure. An object of the present invention is to solve the problems of the conventional pressure relief device and to provide a small, inexpensive and highly airtight liquid pressure relief device for a liquid tight container without liquid leakage.

[0004]

In order to achieve the above object, in the pressure relief device of the present invention, a vent is provided from the gas phase inside the vessel to the outside of the vessel, and the opening of the vent on the outside of the vessel is provided. The edge protrudes in a convex shape to form a cap mounting portion, and in a concave cap formed of a material having elasticity, an inner peripheral side wall of the cap and an outer peripheral side wall of the cap mounting portion form a sealing surface. The filter that fits into the cap mounting portion so as to block the liquid and pass only the gas is mounted so as to cover the opening of the ventilation hole. The outer diameter of the cap mounting portion is substantially larger than the inner diameter of the cap. Further, the diameter of the opening edge of the cap mounting portion is smaller than the diameter of the ventilation hole, and a projection is provided inside the cap to be inserted into the ventilation hole, and a lower portion of the projection is substantially a cap. The diameter is larger than the diameter of the opening edge of the mounting portion and smaller than the diameter of the ventilation hole.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a cross-sectional view of a stopper of a liquid closed container provided with a pressure relief device according to an embodiment of the present invention. As shown in FIG. 2, the pressure relief device 6 is arranged at the center of the stopper 5 of the container 4 and is located in the gas phase inside the container. FIG. 3 is a partial cross-sectional view showing the structure of one of these pressure relief devices in detail. As best shown in FIG. 3, the pressure relief device 6
Is provided with a vent hole 7 at the center thereof from the gas phase inside the container to the outside of the container, and the opening edge of the vent hole 7 on the outside of the container projects in a convex shape to form the cap mounting portion 11. are doing. The cap mounting portion 11 has a concave cap 12 on the outer peripheral side wall of the cap mounting portion 11 and the cap 12.
Are mounted so as to form a seal surface with the inner peripheral side wall of the rim. The cap 12 is formed of an elastic material such as rubber, and the outer diameter of the cap mounting portion 11 is substantially larger than the inner diameter of the cap 12, so that the outer peripheral side wall of the cap mounting portion 11 The inner peripheral side walls of the cap 12 are in close contact with each other to form a highly airtight sealing surface.

A filter 8 for shutting off the liquid and allowing only the gas to pass therethrough is mounted so as to cover the open end face of the ventilation hole 7 on the inner side of the container. In this embodiment, the filter 8 is
Although it is fixed by attaching the presser stopper 9 having the vent hole 9a to the convex retainer stopper attaching portion 10, it may be attached by directly welding to the stopper member around the vent hole 7, In this case, the stopper plug 9 becomes unnecessary. In the pressure relief device 6 configured as described above, when gas is generated from the liquid inside the container and the internal pressure of the container rises and reaches a certain pressure, the elasticity of the cap 12 loses the internal pressure and the side wall of the cap 12 Extends in the outer peripheral direction, the seal formed between the inner peripheral side wall of the cap 12 and the outer peripheral side wall of the cap mounting portion 11 is released, and the gas inside the container is exhausted (pressure relief). When the internal pressure is reduced by the exhaust, the side wall of the cap 12 contracts in the inner circumferential direction due to the elasticity of the cap 12, and a sealing surface is formed again by the inner peripheral side wall of the cap 12 and the outer peripheral side wall of the cap mounting portion 11. The airtightness of the container is maintained.

[0007] Further, since only the gas inside the container passes through the vent hole 7 and the liquid is shut off by the filter 8, there is no danger that the liquid leaks to the outside simultaneously with the exhaust. Furthermore, the diameter of the opening edge of the cap mounting portion 11 is 1
1a is made smaller than the diameter of the ventilation hole 7 and a projection 12a whose lower part is larger than the diameter 11a of the opening edge of the cap mounting portion 11 is provided at the center of the inside of the cap 12, and Since the fitting is performed, there is no danger that the cap 12 is detached from the cap mounting portion 11 due to an increase in the internal pressure of the container, and the airtightness inside the container is always maintained.

[0008]

As described above, in the container pressure relief device of the present invention, the concave cap formed of the elastic material is replaced with the convex cap provided at the opening edge of the ventilation hole. A very simple configuration in which a sealing surface is formed between the inner peripheral side wall of the cap and the outer peripheral side wall of the cap mounting part on the mounting part. A simple pressure relief device can be provided. Furthermore, the cap is made of a resilient material,
The inner diameter of the cap is made larger than the outer diameter of the cap mounting portion so that the inner peripheral side wall of the cap and the outer peripheral side wall of the cap mounting portion are in close contact with each other, and the lower portion is larger than the opening edge of the cap mounting portion. By providing a projection smaller than the diameter of the pore inside the cap and fitting it into the ventilation hole to prevent the cap from being detached from the cap mounting portion, high airtightness of the container is always maintained. In addition, since the filter that shuts off the liquid and allows only the gas to pass through is provided so as to cover the opening of the ventilation hole, there is no danger that the liquid inside the container leaks to the outside simultaneously with the exhaust.

[Brief description of the drawings]

FIG. 1 shows a detailed sectional view of a conventional pressure relief device.

FIG. 2 shows a sectional view of a stopper of a closed container for liquid provided with a pressure relief device according to the present invention.

3 shows a detailed sectional view of one embodiment of the pressure relief device according to the invention shown in FIG.

[Explanation of symbols]

 1, 7, 9a Vent hole 2, 5 plug 3 Spring 4 Container 6 Pressure relief device 8 Filter 9 Presser plug 10 Presser plug mounting section 11 Cap mounting section 11a Diameter of opening edge of cap mounting section 12 Cap 12a Projection

Claims (6)

[Claims] 1. A pressure relief device for a closed container for liquid, comprising: a plug portion provided in a gas phase portion of the container and having a ventilation hole communicating from the gas phase portion to the outside of the container; A filter member that allows gas to pass therethrough but not liquid through the vent, and is attached to the outside of the plug portion, and when the pressure of the gas phase is lower than a predetermined pressure, the gas passes through the vent to the outside air side. And a resilient cap member for releasing the pressure by releasing the seal when the pressure of the gas phase is higher than the predetermined pressure. Characteristic pressure relief device for closed containers for liquids. 2. The container outer opening edge of the vent hole protrudes in a convex shape to form a cap mounting portion, and the elastic cap member is a concave cap formed of an elastic material. 2. The pressure relief device for a liquid closed container according to claim 1, wherein the seal is formed by elastically fitting an inner peripheral side wall of the cap to an outer peripheral side wall of the cap mounting portion. 3. The pressure relief device for a closed container for liquid according to claim 2, wherein an outer diameter of an outer peripheral side wall of the cap mounting portion is larger than an inner diameter of an inner peripheral side wall of the cap. 4. A diameter of an opening edge of the cap mounting portion is smaller than a diameter of the ventilation hole, and a projection is provided inside the cap to enter the ventilation hole. 4. The pressure relief device for a liquid closed container according to claim 2, wherein the lower portion is larger than the diameter of the opening edge of the cap mounting portion and smaller than the diameter of the ventilation hole. 5. 5. An opening edge of the ventilation hole on the inner side of the container,
The filter member is protruded in a convex shape to form a stopper plug attaching portion, and the filter member is attached to the plug portion by attaching a stopper plug to the stopper plug attaching portion. 5. A pressure relief device for a liquid closed container according to 4. 6. The filter member is attached to the plug portion by welding the filter member to the plug portion around the vent hole.
A pressure relief device for a closed container for liquid as described in the above.