JPH01230912A - Small-sized pressure vessel - Google Patents

Abstract

PURPOSE:To avoid the danger of explosion by opening a gas passage released when push-in force is applied to a stem and forming a piece of stem rubber of shape memory material which changes at the set temperature. CONSTITUTION:Since a piece of stem rubber 5 is held by an inner top wall 10a upward and is not deformed, a stem 4 which is locked with a free end 6 by an outer channel 13 is held at a valve-closed position against the elastic force of a spring 3 while, when the stem 4 receives push-in force, shape- memorized material is used so as to change the shape at the time of valve opening by the abnormal increase of temperature because the stem 4 is bent to the inside of a valve chamber 12 to open a gas passage. Therefore, when a gas bomb and the like are heated to reach the set temperature, a gas passage 7 is opened and inner pressure is released while at the same time residual gas and the like are released because the stem rubber 5 is deformed to push down at the same as a using condition.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to gas cylinders for portable gas filters and other gas appliances, and filled containers that spray or eject a target substance when released and expanded through a valve. It relates to small pressure vessels.

(Prior Art) This type of container is sealed with a valve, so if the container is discarded after use and thrown into a fire, there is a risk of it exploding and causing an accident. To prevent this, it is possible to destroy the valve or make a hole in the container, but it is impossible to do this in all cases, and no technology to prevent explosions has yet been disclosed.

(Technical Problem) The purpose of the present invention is to solve the above-mentioned problems and provide a small pressure vessel that can avoid the risk of explosion by forcibly opening the valve by heating and actively releasing residual gas. There is a particular thing.

(Technical Means) The present invention achieves the above object by providing a mountain cup 2 of a container body 1 with a stem 4 that protrudes by a spring 3, and which is closed by an inner free end 6 of a stem rubber 5 fixed to the inner top of the mountain cup 2. A gas passage 7 which is opened by the deformation of the free end 6 when a pushing force is applied to the stem 4 is opened on the side surface of the stem 4 leading to the gas outlet 8, and the stem rubber 5 is kept at a set temperature. It is made of a shape memory material that deforms in such a way as to push down the stem 4 against the force of the spring 3.

(Example) To explain with reference to the drawings, each figure takes as an example a gas cylinder used for a portable gas stove, etc., so it has a cylindrical container main body 1 with a mountain knob 2 protruding from its tip. A stem 4 protrudes from the center hole 9, and the stem 4
is a holding cylinder part 10 formed in the center of the mountain cup.
The valve seedling 12 on the tip side of the housing 11 is fixed by caulking.
The valve chamber 12 is built into the valve chamber 12 so as to be able to move up and down, and is biased in the projecting direction by a coiled spring 3 that is compressed between the lower surface of the stem and the bottom of the valve chamber 12. An annular stem rubber 5 is fixed between the housing tip and the inner wall 10a of the holding cylinder 10, and the inner free end 6 of the stem rubber 5 is connected to the gas outlet 8 of the stem 4.
The gas passage 7 leading to is closed.

The stem rubber 5 is restrained upward by the inner wall 10a and does not deform, so that the stem 4, which is engaged with the free end 6 and the outer groove 13, is pushed against the elasticity of the spring 3 to the left half in FIG. While maintaining the valve in the indicated closed position, when the stem 4 receives a pushing force, it bends inward into the valve chamber 12 to open the gas passage 7 (see the right half of Figure 2). Made of flexible material with elasticity.

The present invention solves this problem by using a polymer with shape memory properties.
At room temperature, it functions exactly like conventional stem rubber, but
A shape memory rust material is used so that it deforms to the shape when the valve is opened due to an abnormal rise in temperature. Of course, although the stem rubber 5 is called rubber, it does not have to be rubber, and any material that has elasticity and flexibility and is suitable for sealing may be used. This type of material changes its shape around the glass transition point (19 points), such as polynorbornene resin, nylon resin, polyethylene resin, etc. 80 ~ while still being deformed to half shape
When the temperature reaches an abnormal temperature of 90°C, the free end changes to an open state as shown in the right half of the figure. Note that 14 indicates a siphon tube.

(Operation of the Invention) When the gas cylinder having the above configuration is placed under a set heating condition, the stem rubber 5 deforms to open the gas passage 7. That is, as shown in the right half of FIG. 2, when the set temperature is reached, the stem rubber 5 returns to its memorized shape, and the inner free end 6 deforms downward, causing the stem 4 to engage with the outer groove 13. Since the gas passage 7 is pushed down against the elasticity of the spring 3, the gas passage 7 is opened. Note that the right half of FIG. 2 shows a state in which gas is ejected not only during the above-mentioned abnormality but also during normal use.

(Effects of the Invention) Therefore, according to the present invention, even if a gas cylinder or the like is heated by being thrown into a fire, when the set temperature is reached, the stem rubber 5 deforms and the stem 4 can be pressed down in the same manner as in use.
The gas passage 7 releases the internal pressure that had been raised up to that point, and at the same time releases any remaining gas. Therefore, it is safe without the risk of explosion, and is easy to implement by changing the material of the stem rubber.

[Brief explanation of the drawing]

The drawings show a small pressure vessel according to the present invention, with FIG. 1 being a side view and FIG. 2 being a partially enlarged sectional view. 1... Container body, 2... Mountain cup, 3...
・Spring, 4... Stem, 5... Stem rubber, 6.
...Free end, 7...Gas passage, 8...Gas outlet. Patent applicant Figure 1

Claims (1)

[Claims] The mountain cup 2 of the container body 1 is provided with a stem 4 that protrudes by a spring 3, and when the stem 4 is closed by the inner free end 6 of the stem rubber 5 fixed to the inner top of the mountain cup 2 and a pushing force is applied to the stem 4, the above-mentioned A gas passage 7 opened by the deformation of the free end 6 is opened on the side of the stem 4 leading to the gas outlet 8, and the stem rubber 5 deforms at a set temperature and resists the spring 3 to cause the stem 4 A small pressure vessel made of a shape memory material that deforms by pressing down on it.