JPS6253757B2 - - Google Patents

Description

[Detailed Description of the Invention] Field of Industrial Application The present invention relates to a safety device for gas cylinders, and more specifically to a safety device for gas cylinders that automatically closes due to vibrations such as earthquakes. be.

〓Conventional technology〓 Conventionally, safety devices for this type of gas cylinder include:
Various types of pendulum-type valve actuators have been proposed that actuate the valve body to close the outlet when the gas cylinder body tilts or vibrates.

Gas cylinder safety devices that use this type of pendulum-type valve actuating body have the disadvantage that unless the distance the valve moves between closing and opening is increased, the valve will close due to the gas flow during normal use. On the other hand, it is difficult to increase the travel distance of the valve because the risk of shaking such as an earthquake is relatively small. Therefore, recently, the valve has been made to have a desired weight so that it does not shift due to the outflowing gas flow, and the valve is made of a magnetic material and is equipped with a magnet that attracts the valve so that it can be swayed. It has also been proposed that once the valve is closed, the valve is attracted and held in the closed state by magnetic force against the valve's own weight.

〓Problems to be solved by the invention〓 However, the conventional safety device for gas cylinders using this type of pendulum type valve actuator has many malfunctions and cannot be put into practical use. It has not yet been reached.

In other words, adding a complicated mechanism to increase the travel distance of the valve with small vibrations not only causes failure but also reduces durability. Even if the gas cylinder body itself is made of a magnetic material, the desired magnetic attraction force cannot be obtained due to the influence of leakage magnetic flux, or conversely, the magnetic force increases abnormally due to cooling by the outflowing gas, causing the valve to close. There are things.

Therefore, the present invention has been made in view of the above,
The object of the present invention is to provide a gas cylinder safety device that has a simple configuration and has high reliability without using a magnet.

〓Means for solving the problems〓 In line with the above-mentioned object, the structure of the present invention, which is summarized in the above-mentioned claims, has a vertical flow channel arranged at the top of the gas cylinder body 1 in order to solve the above-mentioned problems. 2
A first valve seat 14 is provided on the top of the first valve seat 1.
A screw type on-off valve 21 is provided above the screw type on-off valve 21, a piping connection port 22 is provided on the downstream side of the screw type on-off valve 21, and a second valve seat whose diameter gradually increases downwardly is provided at the bottom of the vertical flow path 20. A valve chamber 4 is provided below the second valve seat 3, and a ball valve 5 placed on a vertically movable rod 12 is accommodated in the valve chamber 4. Below the rod 12, there is a horizontal plate 7 on the top on which the vertically movable rod 12 is placed, and a vertical rod 6 with a weight 8 at the bottom. A technical measure has been taken in which a valve pushing rod 13 is protruded from the lower part of the screw type on-off valve 21 and passes through the vertical flow path 20.

〓Operation〓 Therefore, the safety device of the gas cylinder of the present invention maintains the relationship between the weight of the ball valve 5 and the gap size between the ball valve 5 and the second valve seat 3 during normal gas use. The ball valve 5 is set so as not to be displaced by the gas flow passing between it and the second valve seat 3, and the weight of the ball valve 5 is set such that the weight of the ball valve 5 is reduced when the gas flow is present. When the second valve seat 3 approaches the second valve seat 3, the pressure difference between the upstream side and the downstream side of the second valve seat 3 prevents the second valve seat 3 from falling under its own weight.
First, assuming that the gas cylinder main body 1 is normally upright and the screw type on-off valve 21 is closed, the ball valve 5 is pushed down by the valve push rod 13 and is in the open state, but the screw type on-off valve 21 Since it is closed, gas cannot escape.

Therefore, when the screw type on-off valve 21 is opened, the gas flows through the vertical flow path 20 to the piping connection port 22 side, and at this time, the ball valve 5 remains placed on the vertically movable rod 12 due to its own weight. Therefore, gas supply will continue.

If the gas cylinder main body 1 is tilted or overturned from the above state, the horizontal plate 7 will be kept in a horizontal state by the weight 8, and the vertically movable rod 12 will be tilted together with the gas cylinder main body 1.
2 rises as shown in FIG. 2, bringing the ball valve 5 into pressure contact with the second valve seat 3. At this time, the screw type on-off valve 21 is open and gas is being used in a gas appliance (not shown) connected to the piping connection port 22, or the piping (also not shown) connected to the piping connection port 22 is damaged. When gas flows, the ball valve 5 is pressed against the second valve seat 3 due to the pressure difference between the upstream side and the downstream side of the second valve seat 3, thereby preventing gas from flowing out.

Further, when the gas cylinder main body 1 is shaken due to an earthquake or the like, the horizontal plate 7 tries to maintain a horizontal state by the weight 8, as in the case where the gas cylinder main body 1 is tilted. Since the vertically movable rod 12 swings together with the gas cylinder main body 1, the vertically movable rod 12 moves up and down. If there is no gas flow at this time, the ball valve 5 will return to the top of the vertically movable rod 12 due to its own weight when the shaking stops, but if gas is used when this shaking occurs, there is a gas flow. In this case, the raised ball valve 5 narrows the gap with the second valve seat 3 and is attracted to the second valve seat 3, resulting in a closed state. At this time, the upstream and downstream sides of the second valve seat 3 Due to the pressure difference, the ball valve 5 continues to be pressed against the second valve seat 3, thereby blocking the outflow of gas.

Embodiments Next, embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is a gas cylinder main body, a first valve seat 14 is provided at the top of a vertical flow path 20 arranged at the top of this gas cylinder main body 1, and a screw type on-off valve 21 is installed above this first valve seat 14. A piping connection port 22 (generally, this piping connection port 22
(also serves as a gas inlet) is the same as the conventional one.

The lower part of the vertical flow path 20 forms a second valve seat 3 whose diameter gradually increases downward, and a valve chamber 4 is provided below the second valve seat 3. In the illustrated example, the vertical passage 20, the second valve seat 3, the valve chamber 4, the first valve seat 14, and the pipe connection port 22 are the gas cylinder body 1.
The housing 23 is arranged in an integral housing 23 which is screwed onto the top of the housing 23 in an airtight manner.

A ball valve 5 placed on a vertically movable rod 12 is housed in the valve chamber 4. The vertically movable rod 12 has an upper surface on which the ball valve 5 is placed, and a lower surface on which a horizontal plate 7 (to be described later) is placed, leaving a gas flow path in the lower opening of the valve chamber 4. It has been inserted. Further, although the ball valve 5 is formed of a steel ball or the like, it may be hollow or formed of plastic, rubber, etc. in order to reduce the weight.

Further, below the vertically movable bar 12, a vertical bar 6 having a horizontal plate 7 on the top on which the vertically movable bar 12 is placed and a weight 8 at the bottom is mounted, and the vertical bar 6 is supported by a fulcrum 9 in the middle of the vertical bar 6. A vertical rod 6 is supported so as to be tiltable in all directions. That is, this vertical rod 6 is always maintained in a vertical state by the weight 8, and as the gas cylinder body 1 or the vertically movable rod 12 tilts or swings, the contact between the horizontal plate 7 and the bottom surface of the vertically movable rod 12 is inclined, and the vertical position is The flexible rod 12 is pushed up.

Further, a valve pushing rod 13 extending through the vertical flow path 20 is protruded from the lower part of the screw type on-off valve 21.

〓Effects of the Invention〓 Since the safety device for the gas cylinder of the present invention is as described above, it provides a safety device for the gas cylinder that automatically shuts off the outflow of gas when the gas cylinder main body 1 tilts or swings, thereby preventing gas leakage accidents. What is noteworthy is that when the gas cylinder main body 1 tilts or swings, if there is no gas flow, the cutoff will not occur, so that a gas cylinder safety device with fewer malfunctions can be provided.

In particular, since the safety device for the gas cylinder of the present invention is constructed by dividing the vertically movable rod 12 and the ball valve 5, the ball valve 5 can be made lighter and the pressure between the upstream side and the downstream side of the second valve seat 3 can be reduced. The difference is that gas outflow can be reliably shut off without using a magnet as in the past, and a ball valve with excellent shutoff performance and durability can be used. Furthermore, by configuring the vertically movable rod 12 and the ball valve 5 separately, it is possible to convert shaking into efficient and reliable vertical movement (with little deviation in the horizontal and forward directions) by the vertically movable rod 12. Due to the combination of the ball valve 5 and the second valve seat 3 whose diameter gradually increases downward, the vertical movement distance of the ball valve 5 is large, and the rocking of the gas cylinder body 1 ensures that the ball valve can be opened securely. 5
It is possible to provide a safety device for gas cylinders that operate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a safety device for a gas cylinder according to the present invention, and FIG. 2 is a sectional view of the same main part when the main body of the gas cylinder is tilted. 1... Gas cylinder body, 3... Second valve seat, 4...
... Valve chamber, 5 ... Ball valve, 6 ... Vertical rod, 7 ... Horizontal plate, 8 ... Weight, 9 ... Fulcrum, 12 ... Elevating rod, 13 ... Valve push rod, 14 ... No. Ichibenza, 2
0...Vertical flow path, 21...Screw type on/off valve, 22...
...Piping connection port.

Claims (1)

[Claims] 1. Vertical flow path 2 arranged at the top of the gas cylinder body 1
A first valve seat 14 is provided on the top of the first valve seat 1.
A screw type on-off valve 21 is provided above the screw type on-off valve 21, and a piping connection port 22 is provided on the downstream side of the screw type on-off valve 21, and a second valve seat whose diameter gradually increases downwardly is provided at the bottom of the vertical flow path 20. A valve chamber 4 is provided below the second valve seat 3, and a ball valve 5 placed on a vertically movable rod 12 is accommodated in the valve chamber 4. Below the rod 12, there is a horizontal plate 7 on the top on which the vertically movable rod 12 is placed, and a vertical rod 6 with a weight 8 at the bottom. A safety device for a gas cylinder, which is supported so as to be tiltable in the direction shown in FIG.