JPH0263567A - Small-sized pressure vessel - Google Patents

Abstract

PURPOSE:To prevent explosion by providing a valve plug which is brought into pressurized contact with a gas flow port communicating with a siphon tube by a valve closing spring to the inner end part of a stem and providing a valve opening spring having a shape memory property between this valve plug and the stem so that the valve opening spring extends to lift the valve closing spring and to release remaining gases when the spring is heated. CONSTITUTION:The gas flow port 8 communicating with the siphon tube 14 is formed to the inner end part of the stem 4, which is vertically movably held, of a valve mechanism to be built into the upper part of the cylindrical container. The valve plug 15 which is brought into pressurized contact with this gas flow port 8 by the coiled valve closing spring 17 is vertically slidably provided. Further, the coiled valve opening spring 20 consisting of a shape memory alloy which can counter with the valve closing spring 17 is interposed between the valve plug 15 and the stem 4. The valve opening spring 20 extends by overcoming the spring force of the valve closing spring 17 and depresses the valve plug 15 and the stem 4, thereby opening the gas vent port 8 when the ambient temp. is made in a set heating condition with such constitution.

Description

Detailed Description of the Invention (Field of Industrial Application) 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 released and expanded through a valve. (Regarding pressure vessels.

(Prior art) This type of container is sealed tightly with a valve, so if it is discarded after its use and is thrown into a fire, or if it is heated due to improper usage, it may explode and cause an accident. There is a risk of causing

(Technical Issue) To prevent this, it would be 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.

The purpose of the present invention is to solve the above-mentioned problems, and avoid the danger of explosion by forcibly opening the valve by heating and actively releasing the residual gas, while at the same time returning to its original state when heating stops. Our objective is to provide a small pressure vessel.

(Technical means) Item iii [1] A gas vent leading to the siphon pipe is formed at the inner end of the stem that is vertically movable in the container body, and a valve closing spring is pressed into the gas vent. A valve element is movably provided, and a valve opening spring opposed to the face spring is interposed between the valve element and the stem, and the valve opening spring resists the valve closing spring at a set temperature. This is achieved by a small pressure vessel made of shape memory material that deforms to push down on the body and open a gas vent.

(Example) To explain with reference to the drawings, each figure shows an example of a gas cylinder used for a portable gas stove etc. 1 is a cylindrical container body, 2 is a mountain cup at the tip, 3 is the housing of the valve mechanism, and the valve chamber 1 communicates with the siphon pipe 14.
2, and a holding cylinder part 10 of the mountain cup 2 at the upper end.
It is caulked and fixed.

4 is a stem, which is connected to the valve chamber 1 from the center hole 9 of the holding cylinder portion 10.
A stem rubber 5, which is built into the stem 2 so as to be vertically movable and fixed between the upper end of the housing 3 and the inner top wall 10a of the holding cylinder part, engages with the outer circumference of the stem to hold the stem 4 in a fixed position. ing. 7 is a gas passage that is closed by the stem rubber 5, and when the stem 4 is pushed in, the discharge port 4a in the stem;
It is passed through the side passage 11 of the valve chamber 12 and the siphon pipe 14.

Reference numeral 8 denotes a gas vent opening at the inner end of the stem, 13 is a lower part of the stem, 15 is a valve body that can be moved up and down in the inner chamber 16 of the lower part of the stem, and 17 is installed between the lower end of the inner chamber and the valve body 15. 111 Valve spring, connect the seat 18 of the valve body 15 to the gas vent 8.

This valve is closed by pressure contact. Reference numeral 19 indicates a connecting portion between the stem 4 and the lower portion 13.

A valve opening spring 20 that can counteract the valve closing spring 17 is interposed between the valve body 15 and the stem 4, and this valve opening spring 20 has a coil shape similar to the valve closing spring 11. However, when the ambient temperature reaches the set temperature due to the shape memory alloy material, it expands against the spring force of the valve closing spring 17 and operates to push down the valve body 15 and open the gas vent 8. Reference numeral 21 indicates a communication port that communicates with the gas vent 8 and the side passage 11, and 22 indicates a pressure spring that presses the lower stem portion 13 upward.

(Function) When the gas cylinder having the above configuration is placed under a set heating condition, the valve opening spring 20 deforms to open the gas port 8. That is, as shown in the left half of FIG. 3, when the set temperature is reached, the valve opening spring 20 returns to its memorized shape, and the entire valve expands to resist the elasticity of the valve closing spring 17 against the valve element 15 engaged at its lower end. Since the gas vent 8 is released, the siphon pipe 14, the side passage 11, the communication port 21, the gas vent 8, and the discharge port 4a are pressed down.
Release more gas to the outside of the vessel. In addition, during normal use, the stem rubber 5 is pushed in and only the gas passage 7 is opened in the state shown on the right side in FIG. Furthermore, when the gas is released, the temperature inside the container body 1 drops by m degrees due to the latent heat of vaporization, and when the temperature drops below a certain level, the valve opening spring 20 contracts, so the valve element 15 closes the gas vent 8 again with the seat 18. , stop releasing gas.

(Effect) 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 valve opening spring will extend and push down the stem, open the gas vent, and release the remaining gas. Release gas. Therefore, it is safe because there is no risk of explosion, and it returns to its normal state when the temperature drops, so it can be reused in the case of momentary activation due to abnormal use.

[Brief explanation of the drawing]

The drawings show a small pressure vessel according to the present invention; FIG. 1 is a side view, FIG. 2 is a partial elevational view, and FIG. 3 is an enlarged view of the main parts. 1... Container body, 2... Mountain cup, 3...
・Housing, 4... Stem, 5... Stem rubber 7... Gas passage, 8... Gas vent, 12... Valve chamber, 13... Stem lower part, 14... Siphon pipe ,1
5... Valve body, 17... Valve closing spring, 20... Valve opening spring. Patent applicant: 4 Non-Frontier Co., Ltd.

Claims (1)

[Claims] A gas port communicating with the siphon pipe is formed at the inner end of the stem that is vertically movably incorporated into the container body, and a valve body is slidably provided in pressure contact with the gas port by a valve closing spring. and a valve-opening spring opposing the spring is interposed between the valve-closing valve and the stem, and the valve-opening spring deforms to push down the valve body against the valve-closing spring at a set temperature and open the gas vent. A small pressure vessel made of shape memory material.