JPH037808A - Small size pressure vessel - Google Patents

Abstract

PURPOSE:To avoid the danger of explosion caused by heating and make it possible to restore the original conditions when the temperature falls by providing in a valve casing a spring that energizes the stem in the direction of its projection and a control member made of a shape memory material which pushes in the stem against the spring force when the temperature exceeds a set temperature between the stem and the valve casing. CONSTITUTION:When a pressure vessel is heated, its control member 16 deforms and the pressure vessel makes a gas passage 9 open. Namely the title device is in the state shown in the right half of the figure, and when the temperature exceeds a set temperature, the control member 16 deforms to a memorized shape, both end sections 17 and 18 which deform in the direction of the shaft pushing in the stem 5 which engages the member 16 against the spring force of a spring 20 so that a gas passage 9 is opened and it discharges the gas out of the device from a syphon pipe 22, valve chamber 10, gas passage 9, and discharge port 7. Accordingly there is no danger of explosion. By the way, during usual use the pressure vessel is also in the state shown in the right half of the figure, and a flexible valve piece 11 is pushed in and a gas passage 8 is open. Further, when gas is released, the temperature in the main body 1 of the vessel falls by the vaporization latent heat, and when it is below a certain temperature, the control member 16 restores its original shape, closing again the gas passage 9 of the stem and the discharge of the gap stops.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to gas cylinders used in portable gas stoves and other gas appliances, and to gas cylinders that spray or eject gaseous substances when released and expanded through a valve. It relates to small pressure vessels such as containers.

(Prior Art) This type of container is sealed with a valve, so if it is heated in an abnormal manner or thrown into a fire, it may explode and cause an accident.

(Technical issue) To prevent this, it would be possible to destroy the valve of the container after use or make a hole in the container itself, but it is impossible to do this for all containers. Furthermore, no technology has yet been disclosed to prevent explosions if they are thrown into a fire for fun. Therefore, the inventors of the present invention have endeavored to develop a container that does not cause the above-mentioned problems.

Therefore, the object of the present invention is to solve the above-mentioned problem by forcibly opening the valve by heating and actively releasing residual gas, thereby avoiding the risk of explosion, and at the same time, allowing the valve to return to its original state when heating stops. The purpose of the present invention is to provide a compact pressure vessel with a high temperature.

(Technical Means) The above object is to form a stem attachment opening in a hollow valve attachment body provided in a container body, and to push a bottomed stem having an axial gas discharge opening into the attachment opening. A flexible valve piece is attached to the valve mounting body so as to protrude as much as possible, contacts the gas vent on the side of the stem that leads to the gas discharge port, closes this, and when the stem is pushed in, elastically deforms and opens the gas vent. Provided between the stems,
A valve casing is attached to the valve mount to receive the inner end of the stem and to fix the flexible valve piece to the valve mount, a spring is provided inside the valve casing to bias the stem in the protruding direction, and This is achieved by providing a control member made of a shape memory material between the stem and the valve housing, which pushes the stem against the spring when the value exceeds a set value.

(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 cylinder provided at the tip thereof. 3 is a hollow valve mounting body protruding from the center of the mountain cup, and 4 is a mounting opening for a stem 5, which opens in the top wall 6 of the valve mounting body 3, into which the stem 5 is attached. It is inserted in a pushable manner.

The stem 5 has an axial and bottomed gas discharge lower, and has a groove 8 formed near (outside of) the bottom of the discharge lower, in which a gas passage 9 communicating with the discharge lower and the valve chamber IO is formed. A flexible valve 11 is engaged with the groove 8 of the stem 5 to close the gas port 9. Therefore, the stem 5 is connected to the top wall 6 by the flexible valve 11.
The valve is held in the closed position in close contact with the inner surface of the valve (left half of Figure 2). Therefore, the flexible valve piece 11 is attached to the retainer 12 at the peripheral edge.
The retainer 12 is fixed by a valve housing 13 which is caulked and fixed to the valve mounting body 3.

The retainer 12 is interposed between the flexible valve piece 11 and the valve housing 13 in order to provide an inner flange 14 that protrudes inward. A control member 16 made of a shape memory material and having a substantially C-shaped planar shape or a notched ring shape is disposed between the control member 16 and the flanged portion 15 provided on the stem 5 so as to be disposed. This control member 16 is made of metal (or resin may also be used) whose shape is memorized in two directions so that the two ends 17 and 18 are displaced in opposite directions when the set temperature is exceeded. Various shapes and structures shown in can be used. The example in FIG. 3 has a notched ring shape with a circular cross section like the example in FIG. 2, but the example in FIG. 4 has two C-shaped members 16. , 16□, and the one in FIG. 5 shows an example in which the cross-sectional shape of the C-shaped member in the example in FIG. 4 is changed from a circular shape to a thin rectangular shape. In the above examples, as shown in each figure (b), the end portion is deformed with respect to the middle portion, and the deformed state of being twisted or curved is memorized, and normally the flat state is maintained. Note that the intermediate portion may be set to be deformed with respect to the end portion. Next, in the example shown in Fig. 6, the wound coils are formed into a circular ring shape that fits between members 14 and 15. At room temperature, the rows of wound coils fall down and overlap as shown in Fig. 6 (C), so that the thickness can be reduced ( When the temperature exceeds the set temperature, it stands upright and generates a stroke in the axial direction as shown in Figure (b).The example in Figure 7 shows that the coil forming section of the coil ring similar to Figure 6 is different from the normal one. It is formed so that it deforms from a flat oval shape to a circular shape to produce a stroke when an abnormality occurs.

In each figure, 19 is a spring receiver protruding from the other end of the stem 5;
is a spring that urges the stem 5 in the projecting direction, and the spring receiver 1
9 and a stepped portion 21 formed inside the valve housing 13 in a compressed state. 22 indicates a siphon tube.

(Function) When the pressure vessel configured as described above is heated, the control member 16 deforms and the gas vent 9 is opened. In other words, as shown in the right half of Figure 2 (when the set temperature is exceeded, the control member 1
6 is deformed into the memorized shape, and both ends 17 and 18 are deformed in the axial direction to push the engaged stem 5 against the elasticity of the spring 20, so that the gas vent 9 is opened and the siphon pipe 22 ,
Gas is discharged to the outside from the valve chamber 10, gas port 9, and discharge lower.

In addition, during normal use, the valve is in the right half state in FIG. 2, the flexible valve piece 11 is pushed in, and the gas port 8 is opened.

Furthermore, when the gas is released, the temperature inside the container body 1 decreases due to latent heat of vaporization, and when the temperature drops below a certain level, the control member 16
As the stem 5 returns to its original shape, the gas port 9 of the stem 5 is closed again and stops 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, if the temperature exceeds the set temperature, the control member deforms, pushes the stem, opens the gas vent, and removes the remaining gas. , so there is no risk of explosion. Therefore, it is safe, and since it returns to its normal state when the temperature drops, it can be reused in the case of momentary activation due to abnormal use.

In particular, in the present invention, since a control member that exerts a large torque is interposed between the stem and the valve housing, the structure is simplified and very accurate operation can be obtained.

[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 an enlarged cross-sectional view of main parts showing states before and after operation, and FIGS. 3 to 7 show modified examples of the control member. It is an explanatory diagram of each action. 1... Container body, 2... Mountain cup, 3...
・Valve mounting body, 4... Stem installation port, 5... Stem, 7... Gas discharge port, 9... Gas vent, 10...
Valve chamber, 11... Flexible valve piece, 13... Valve housing, 14...
- Inner flange part, 15... Flange-shaped part, 16... Control member, 2
0...Spring.

Claims (5)

[Claims] (1) A stem mounting port is formed in a hollow valve mounting body provided in the container body, and a bottomed stem having an axial gas discharge port is attached so as to be able to be pushed into the mounting port,
A flexible valve piece is provided between the valve mounting body and the stem to close the gas vent on the side of the stem leading to the gas discharge port, and to elastically deform when the stem is pushed in to open the gas vent. A valve housing for receiving the inner end and fixing the flexible valve piece to the valve mounting body is attached to the valve mounting body, a spring is provided inside the valve housing to bias the stem in the protruding direction, and the temperature is set at the set value. A small pressure vessel in which a control member made of a shape memory material is provided between the stem and the valve housing to push the stem against the spring when the pressure exceeds the spring. (2) The control member is approximately C-shaped or has a cut-out ring shape in plan, and is installed in contact with a flange-shaped part provided on the stem that fits inside the valve housing and an inner flange provided on the valve casing outside of the flange-shaped part. A small pressure vessel according to claim 1. (3) The small pressure vessel according to claim 1, wherein the control member is a planar ring-shaped coil, and the axial thickness is kept thin by collapsing and overlapping the coil rows at room temperature. (4) The small pressure vessel according to claim 1, wherein the control member is a planar ring-shaped coil whose thickness is kept thin by deforming the cross section of the coil to be flat in the axial direction at room temperature. (5) The control member is made of a two-way shape memory material that returns from the deformed state so as to contact the gas vent again and close it when the temperature drops below the set value. Small pressure vessel.