JPH0368293B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to gas cylinders for portable gas stoves and other gas appliances, and small containers such as filled containers that spray or eject a target substance when the pressure is expanded through a valve. It relates to 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 danger of explosion by forcibly opening the valve by heating and actively releasing residual gas. It's about doing.

(Technical Means) The present invention achieves the above object by providing a stem 4 projecting from the mountain cup 2 of the container body 1 by means of a spring 3, and an inner free end 6 of the stem rubber 5 fixed to the inner top of the mountain cup 2. The stem rubber 5 has a gas passage 7 which is closed by the stem 4 and opened by the deformation of the free end 6 when a pushing force is applied to the stem 4. It is made of a shape memory material that deforms at a set temperature so as to push down the stem 4 against the force of the spring 3.

(Example) To explain with reference to the drawings, each figure shows an example of a gas cylinder used for a portable gas stove etc., which has a mountain cup 2 protruding from the tip of a cylindrical container body 1, Stem 4 from the center hole 9
The stem 4 is vertically incorporated into a valve chamber 12 on the distal end side of a housing 11 which is caulked and fixed to a holding cylinder part 10 formed at the center of the mountain cup, and the stem 4 is vertically movable inside a valve chamber 12 on the distal end side of a housing 11. It is biased in the protruding direction by a coiled spring 3 that is compressed between the bottoms of the holder. An annular stem rubber 5 is fixed between the housing tip and the inner top wall 10a of the holding cylinder 10, and the inner free end 6 of the stem rubber 5 is connected to a gas passage 7 communicating with the gas injection outlet 8 of the stem 4.
is blocked.

The stem rubber 5 has an inner top wall 10a facing upward.
As a result, the stem 4, which is engaged with the free end 6 by the outer groove 13, is kept in the closed position shown in the left half of FIG. 2 against the elasticity of the spring 3. When it receives a pushing force, it bends inward to open the gas passage 7 in the valve chamber 12 (right half of Figure 2), and as the name suggests, it has conventionally been made of a flexible material with elasticity such as rubber.

The present invention uses a polymer with shape memory properties to function in exactly the same way as conventional stem rubber at room temperature, but when the temperature rises abnormally, it deforms to the shape when the valve is opened. use. 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 undergoes a shape change before and after the glass transition point (Tg point), such as polynorbornene resin, nylon resin, polyethylene resin, etc. When the valve reaches an abnormal temperature of 80 to 90°C while it is still deformed to its half shape, 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 the memorized shape, and the inner free end 6 deforms downward, causing the stem 4 engaged with the outer groove 13 to be moved by the spring 3. Since it is pushed down against the elasticity, 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 pushes down the stem 4 in the same way as when in use. , the gas passage 7 opens,
At the same time as releasing the internal pressure that had built up up until then,
Any remaining gas will also be released. Therefore, it is safe without the risk of explosion, and is easy to implement by simply changing the material of the stem rubber.

[Brief explanation of drawings]

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.

Claims (1)

[Claims] 1 A stem 4 protruding from the mountain cup 2 of the container body 1 by a spring 3 is provided, and 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. A gas passage 7, which is sometimes opened by deformation of the free end 6, is opened on the side surface of the stem 4 leading to the gas outlet 8, and the stem rubber 5
The stem 4 deforms at the set temperature and resists the spring 3.
A small pressure vessel made of a shape memory material that deforms by pressing down on it.