JP3073724B2 - Safety valve device for small pressure vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve device for a small pressure vessel having a protruding and retractable nozzle valve at its tip and a valve body communicating with the inside of the pressure vessel.

[0002]

2. Description of the Related Art Small gas containers called cartridges or gas cylinders are used for various gas appliances. The small gas container has a feature that it is easy to replace when the gas runs out. However, since the gas is not always replaced after completely exhausting the gas, the treatment of the residual gas becomes a problem. For example, when thrown into a fire, it was confirmed that in some cases, the container burst when the internal pressure reached about 1.5 MPa.

[0003] On the other hand, conventionally, a sign indicating that used gas containers are degassed and discarded has been provided, but there is a problem of danger when not used. For this reason, as disclosed in Japanese Patent Publication No. 4-34049, a technique has been developed that melts or deforms when heated to a high temperature and discharges residual gas to the outside. However, there is a problem that a difference in performance is likely to occur depending on conditions such as a heating situation, a size of a temperature-sensitive member, and an installation location.

[0004] The above problems apply not only to small gas containers, but also to aerosol products. Similar products cover a wide range of chemicals, cosmetics and other products.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to reliably discharge the contents of a small pressure vessel to the outside.

The present invention also relates to a small-sized pressure vessel which does not explode due to a rise in internal pressure during heating when placed in an extremely heated state, such as throwing into a fire without releasing a fluid such as gas in a normal use state. For the purpose of providing.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method of manufacturing a nozzle valve, in which a second inlet, which is different from the first inlet, is upstream of the first inlet. The nozzle valve is provided with a movable on-off valve capable of opening and closing the second inflow port, and the on-off valve is not opened depending on an increase in internal pressure based on the normal use of the small-sized pressure vessel. off valve by the elastic force of strength that enables opening the opening and closing valve when the constant internal pressure casts is extremely increased during fire
Means for providing an elastic body that acts on the

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The safety valve device according to the present invention is built in a small pressure vessel having a retractable nozzle valve at the tip and a valve body inside the pressure vessel inside.

The nozzle valve has a fluid outlet for the contents out of the vessel, and also has a first inlet from inside the vessel to the outlet. The fluid outlet is provided at the tip of the nozzle valve, and the first inlet is provided upstream of the fluid outlet. The contents include, in addition to fuel gas, liquid and powdery components used in aerosol products and liquefied gas as a pressure source.

[0010] The nozzle valve has a structure in which closing and opening are controlled by the extended and retracted positions. For example, a nozzle valve that is elastically biased in the “out” direction closes in the “out” position,
The valve can be opened at the “submerged” position. It is assumed that the original valve body for closing and opening the valve is provided in the valve body so as to open and close the first inflow port.

[0011] A second inlet different from the first inlet is provided in the nozzle valve upstream of the first inlet. The second inlet is an opening for discharging the fluid inside the vessel to the outside of the vessel,
It is the most upstream and communicates with the fluid outlet. Since the flow of the fluid passing through the second inlet is directly guided to the fluid outlet, the fluid flows around the first inlet.

An on-off valve capable of opening and closing the second inflow port is provided on the nozzle valve. The on-off valve is normally kept closed except that it is opened due to an extremely high internal pressure.

In other words, the on-off valve should not be opened due to an increase in the internal pressure based on the normal use of the small pressure vessel, but should be opened when the internal pressure becomes extremely high such as when the small pressure vessel is thrown into a fire. In addition, it is urged by an elastic body having a relatively strong elastic force. The above-mentioned normal use means, for example, a normal use act when a small pressure vessel is used for a gas appliance.

As the elastic body, for example, a coil spring can be used, but the present invention is not limited to this, and a coil spring can be used either compressively or tensilely.
Further, the on-off valve must be in a closed state until the valve is opened, but it is no longer necessary when the valve opening condition is satisfied. Other configurations according to the above configuration can be appropriately designed.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawings. The figure relates to an example in which a small cylindrical gas container is used as a small pressure container A. A valve main body 11 is provided at the tip of a container main body 10, and the valve main body 11 is provided with a nozzle valve 1 that can be retracted.
2 are provided. An inner end (upstream end) 13 of the valve body 11 is a siphon tube, and can introduce a vaporized gas when the small gas container is laid down.

The nozzle valve 12 has a structure in which a flow port 15 having an outlet 14 for discharging a fuel gas as a fluid to the outside of the chamber is opened at the center, and a first inlet 16 communicating therewith is opened at an intermediate portion. Have. The nozzle valve 12 is provided so as to be movable in the axial direction of an attachment port 18 opened in the holding cylinder 17, and a valve element 19 called a stem rubber or the like fits into a groove portion provided with the first inflow port 16. The valve is closed.

A spring member as means 21 for urging the nozzle valve 12 to the "out" position is disposed inside the valve body 11 and presses the nozzle valve 12 outward. Urging means 2
The acting force of the nozzle valve 1 is the
2 is in the "out" position shown in FIGS.

A safety valve device is incorporated in such a nozzle valve 12. The device includes a second inlet 22, an on-off valve 23 that can open and close the second inlet 22, and an elastic body 24 that urges the on-off valve 23 in a valve closing direction. The on-off valve 23 has its tip inserted into the second inlet 22 and is positioned in a closed state by a strong elastic body 24 from the downstream side.

The on-off valve 23 has a brim-shaped protruding edge 25,
The protruding edge 25 serves as one receiving portion of the elastic body 24 incorporated in the central flow path 15 of the nozzle valve 12 and also serves as a receiving seat for a seal member 26 provided around the second inlet 22 for sealing. . The other receiving portion 27 of the elastic body 24 is provided at the tip of the central flow path 15 together with the fluid outlet 14. The second inlet 22 to the seal member 26 constitute a safety valve device B.

In the drawing, reference numeral 28 denotes a guide portion for maintaining the stability of the nozzle valve 12 when the nozzle valve 12 is retracted. Note that the guide portion 28 also serves as a gas flow path, and includes, for example, a spline-shaped concave portion and a convex portion. The shape, structure, and the like of each part related to the present invention shown in each drawing can be appropriately changed within the scope of the present invention.

When such a small pressure vessel A of the present invention is not used, it is in the state shown in FIG. 2, and when properly mounted on the gas appliance, the nozzle valve 12 is pushed in to open the valve.
In the state shown in FIG. 3, the vaporized gas in the container body passes through the siphon pipe 13 and reaches the fluid outlet 14 via the guide portion 28 and the opened first inlet 16. When the small pressure vessel A is removed from the gas appliance, it returns to the state shown in FIG.

When this is placed in a heating state at an extreme temperature such as throwing it into a fire, the fluid expands and the internal pressure rises significantly. Since the remarkably high pressure overcomes the strong spring force of the elastic body 24, the on-off valve 23 of the present apparatus opens, so that even if the first inlet 16 is closed, the fluid inside the small pressure vessel, that is, the fuel gas is discharged. The gas is discharged from the outlet 14 to the outside of the vessel, and rupture can be prevented. FIG.

[0023]

The present invention is constructed and operates as described above. For example, even if a small pressure vessel in which gas remains is discarded and burned in an incinerator, the internal pressure rises to ensure the outside of the vessel. Since it can be released to the public, there is no danger of explosion or explosion, and safety is significantly improved. On the other hand, since the safety valve can be expected to operate correctly, the internal fluid such as gas will not be discharged in the use state without danger.

[Brief description of the drawings]

FIG. 1 is an external view of a small pressure vessel incorporating a safety device according to the present invention.

FIG. 2 is a longitudinal sectional view showing an embodiment of a safety valve device in the small pressure vessel.

FIG. 3 is a sectional view showing a normal use state.

FIG. 4 is a sectional view showing an operation state of the safety valve.

──────────────────────────────────────────────────の Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 83/44 F17C 13/00-13/14

Claims (4)

(57) [Claims] (1) A state in which the urging means is urged to an outgoing position by an urging means.
A first inlet formed in the nozzle valve so as to communicate with an outlet of the nozzle valve, the nozzle having a nozzle valve capable of being retracted in a state ,
In a small pressure vessel having a valve body inwardly comprising a valve body that closes and opens a first inflow port depending on the position of the nozzle valve, a first inflow port separate from the first inflow port communicating with the fluid outflow port of the nozzle valve is provided. The two inlets are provided in the nozzle valve on the upstream side of the first inlet, the movable on- off valve capable of opening and closing the second inlet is provided in the nozzle valve, and depending on the internal pressure rise based on the normal use of the small pressure vessel, If the internal pressure rises extremely, such as by throwing a small pressure vessel into a fire without opening the above-mentioned on-off valve, the on-off valve can be opened by an elastic force that is strong enough to open the on-off valve.
A safety valve device for a small pressure vessel, comprising an elastic body that acts . 2. A state in which the urging means is urged to an outgoing position by an urging means.
A first inlet formed in the nozzle valve so as to communicate with an outlet of the nozzle valve, the nozzle having a nozzle valve capable of being retracted in a state ,
In a small pressure vessel filled with fuel gas for a gas appliance, which has a valve body inwardly comprising a valve body which closes and opens a first inflow port depending on a retracted position of the nozzle valve, the nozzle valve has a center in a flow path. And the outer end of the flow path is the outlet, and the inner end of the flow path is the second inlet,
A movable on- off valve that can open and close the inflow port is provided on the nozzle valve, and the internal pressure rises due to the internal pressure rise based on the normal use of the small pressure vessel. A safety valve device for a small pressure vessel, comprising: an elastic body that acts on an on-off valve by an elastic force having such a strength that the on-off valve can be opened when it rises extremely. 3. The safety valve device for a small pressure vessel according to claim 1, wherein the on-off valve has a distal end inserted into the second inlet, and is positioned in a closed state by a strong elastic body from the downstream side. 4. The on-off valve has a brim-shaped protruding edge portion, and the protruding edge portion serves as one receiving portion of an elastic body incorporated in a central flow path of the nozzle valve, and also has a hermetic seal around the second inlet. 3. The safety valve device for a small pressure vessel according to claim 1, wherein the safety valve device also serves as a receiving seat for a sealing member provided for the purpose.