JPH0474605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a safety device for gas appliances using gas cylinders.

(Prior Art) In gas appliances that use gas cylinders, it is necessary to deal with the danger of the gas cylinders becoming overheated during use. Since it seems that the cause of this is mainly due to incorrect usage or usage that is not normally expected, efforts were made to prevent such usage (such as Utility Model Publication No. 58-10881).

(Technical Problem) However, when the gas cylinder becomes overheated, the danger cannot be avoided using conventional methods.

An object of the present invention is to solve the above-mentioned problems. Specifically, it is an object of the present invention to remove the gas cylinder from the attached state by utilizing the abnormal pressure that increases due to overheating of the gas cylinder, and to stop combustion. The purpose is to prevent overheating.

(Technical Means) The above-mentioned problem is that the gas cylinder has a socket for connecting the valve nozzle to the gas appliance, and when the pressure inside the socket to which the gas cylinder is connected abnormally rises, the gas cylinder becomes slidable in the direction of removing the gas cylinder. A pressure piston is incorporated, and a magnetic holder is provided around the socket to hold the gas cylinder with a required magnetic holding force,
This problem is solved by setting the force acting on the gas cylinder via the pressure-sensitive piston to exceed the magnetic holding force when abnormal pressure occurs.

(Example) To explain with reference to the drawings, 1 is a cylindrical gas cylinder, 2 is a valve nozzle protruding from a mounting cup 3 provided at the end thereof, and a valve cylinder fixed to the mounting cup 3 by caulking. 4, and is supported by a valve closing spring so as to be retractable. 5
6 indicates a flange, and 6 indicates a siphon pipe.

There is a governor 10 on the gas appliance side, and when the valve nozzle 2 is pushed into the socket 11,
A magnetic holding yoke 12 is provided around the socket 11 to hold the gas cylinder 1 in a connected state. Reference numeral 13 denotes an annular magnet provided within the yoke 12, which provides the yoke 12 with a magnetic holding force against the flange 5.

The socket 11 is formed into a substantially cylindrical shape having an outer diameter that fits into the mounting cup and an inner diameter that allows the valve holder 3a protruding from the center of the mounting cup to be received. The sliding chamber 15 has a margin for moving the nozzle 2 in the axial direction in which it emerges and retracts. 16
Reference numeral 17 indicates a port opening in the center of the piston 14 through which the valve nozzle 2 passes, and reference numeral 17 indicates a valve body disposed at the back of the through hole 16, which can move forward and backward within the valve chamber 18 formed in the governor 10. It is dovetailed and is urged outward by a push spring 19. Also, when the cylinder was installed, the valve nozzle 2 was damaged by the valve body 17 that retreated and hit the valve chamber wall.
is pressed, and the valve in the valve chamber 4 opens. 17a is valve body 1
7 indicates a gas introduction groove provided at the tip that contacts the valve nozzle.

The pressure-sensitive piston 14 has an outer diameter d ₂ that is sufficiently larger than the effective diameter d ₁ of the valve nozzle 2, and has a pressure introduction space inside to effectively utilize the pressure receiving area due to the outer diameter d ₂ for thrust. There are 20. 2
Reference numeral 1 denotes a push-back portion that is in concave contact with the outer surface of the pressure-sensitive piston 14, and is connected to the valve base portion 3 of the mounting cup 3.
a. Furthermore, a seal member 22 is attached to the outer circumference of the piston, and seal members 23 and 24 are also provided between the piston 14 and the valve nozzle 2, and between the piston 14 and the valve body 17, respectively. 25 is a disc spring (or a compression spring may be used) for adjusting the thrust of the pressure-sensitive piston 14; 26 is a base; and 27 is a gas passage of the governor 10.

The acting force required to remove the gas cylinder 1 is determined by the pressure receiving area of the piston 14 and the disc spring 25.
It can be adjusted by changing the strength of the disc spring 2.
5 is easier.

(Function) In the device having the above configuration, when the valve nozzle 2 of the gas cylinder 1 is inserted into the socket 11 and the flange 5 is magnetically attracted to the magnet 13, the valve nozzle 2 is pushed by the valve body 17 and opens. , gas can be discharged into the gas banner, and the pressure-sensitive piston 14 receives discharge pressure, but under normal usage conditions, it is absorbed by the disk spring 25 for thrust adjustment, and the force is not strong enough to remove the gas cylinder 1. Not enough.

Now, if the internal pressure of the gas cylinder 1 rises above the set value for some reason, the abnormal pressure will act on the pressure sensitive piston 14 from the pressure introduction space 20 side, so the force directed outward of the piston 14 will increase,
The disc spring 25 is deformed to push back the valve base portion 3a that is in contact with the push-back portion 21, and the gas cylinder 1 is
will be removed. Considering under what conditions the above action works, is the attraction force of the magnet, and is the thrust force applied to the valve nozzle, that is, π/4×d ₁ ² × p ₁ (p ₁ : normal pressure, e.g. 0 to 4 kg) /cm ² ) is the thrust applied to the pressure-sensitive piston, that is, π/4×d ₁ ² × p ₂ (p ₂ : abnormal pressure, e.g. 4Kg/cm ² or more) is the force of the spring acting in the direction of pushing back the valve nozzle. When , the following conditions are satisfied: ＞+ when normal, ＜+3 when abnormal.

Note that a reset operation is not required to reinstall the gas cylinder, but even if the pressure difference between the sockets disappears when the cylinder is removed, the gas cylinder will come off while the internal pressure of the cylinder is high, making it impossible to reinstall the gas cylinder, making it unsafe. Highly sexual.

(Effects) The present invention is configured and operates as described above, so that when the temperature around the gas cylinder rises abnormally, the pressure-sensitive piston is automatically operated by the pressure, and the magnetically held gas cylinder is Since it can be removed from the gas appliance side, combustion will stop and the pressure will not rise, making it highly safe, and the gas appliance cannot be used while the internal pressure of the gas cylinder is high, preventing the gas cylinder from exploding. It is possible to eliminate such dangers.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cutaway side view, and FIGS. 2 and 3 are cross-sectional explanatory views before and after the safety device is activated. 1... Gas cylinder, 2... Valve nozzle, 10
...Governor, 11...Socket, 13...Magnet,
14...Pressure sensitive piston, 17...Valve body, 20...
Pressure introduction space, 21... push-back part.

Claims (1)

[Claims] 1. It has a socket for connecting the valve nozzle of a gas cylinder to a gas appliance, and incorporates a pressure-sensitive piston that can slide in the direction of removing the gas cylinder in response to an abnormal increase in pressure in the socket to which the gas cylinder is connected, and the surrounding area of the socket The gas cylinder is provided with a magnetic holding body that holds the gas cylinder with a required magnetic holding force, and is set so that the force acting on the gas cylinder via the pressure-sensitive piston when abnormal pressure occurs exceeds the magnetic holding force. Features safety devices for gas appliances.