JPH041262B2 - - 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.

On the other hand, in conventional gas appliances, gas cylinders were attached and removed using a mechanism equipped with a lever that pushed the rear end of the gas cylinder. A cylinder holding mechanism has been developed that uses magnets to attach the cylinder.

Even with a mechanism that magnetically holds a gas cylinder using a magnet, measures against overheating of the gas cylinder are necessary. For this reason, various measures have been considered for safety devices in case magnetic gas cylinders become overheated, and applications have already been filed for some of the developed devices.

The present invention was created from the above-mentioned process, and its purpose is to avoid danger by dealing with abnormal situations such as overheating of gas cylinders without damaging the reliable and easy attaching/detaching operation of gas cylinders using magnets. Our objective is to provide safety devices for gas appliances.

(Technical Means) The above object is to incorporate a pressure-sensitive piston into a socket formed in a gas appliance for connecting the valve nozzle of a gas cylinder, which slides in the direction of removing the gas cylinder when the pressure inside the socket increases abnormally. A yoke for holding the gas cylinder by magnetic force is provided outside the socket, and the yoke is made of a material that is magnetic up to a certain temperature, but becomes non-magnetic or becomes significantly weaker in magnetism above that temperature. This is achieved by a safety device for gas appliances characterized by the following features:

In the above configuration, the pressure-sensitive piston detects abnormal pressure and itself is a means of contacting the gas cylinder to push it out, and the yoke detects abnormal temperature, that is, overheating, and itself is a means to push out the gas cylinder. This is a means of losing magnetic force due to a rise in temperature and stopping the magnetic retention of the gas cylinder.

(Example) Referring to the drawings, each figure shows an example of a gas appliance using a cylindrical gas cylinder 1. 2
is a mountain cup provided at one end of the gas cylinder 1; 3 is a circular ring-shaped flange forming a part thereof; 4 is a valve mechanism attached to the mountain cup 2; the valve nozzle 5 provided thereon is retractable; It has a built-in closing spring 6 that opens the valve when it is biased in the projecting direction. 7 is a siphon pipe provided in the valve mechanism 4. The effective diameter of the valve nozzle 5 for discharging the vaporized gas is _d1 .

10 is a governor equipped with a socket 11 for connecting the valve nozzle 5; 12 is a pressure-sensitive piston built into the sliding chamber 13 of the socket 11 so as to be slidable in the axial direction; the diameter of the piston 12 is d ₂ ,
The diameter should be sufficiently larger than the effective diameter _d1 of the valve nozzle 5. The pressure-sensitive piston 12 has a push-back part 14 recessed on the front surface to a size that receives the valve pedestal part 2a at the center of the mountain cup, and has a through hole part 15 opening in the center to receive the valve nozzle 5. 1
A first seal ring 6 fits on the outer periphery of the piston 12 and maintains sealing with the wall surface of the sliding chamber 13; 17 fits on the inner periphery of the through hole 15 and maintains sealing with the valve nozzle 5. This is the second seal ring. Sliding chamber 13
A pressure introducing chamber 13' having the same diameter is provided at the back of the chamber.

Further, on the governor side, 18 is the piston 1
2 is the valve body whose tip touches, 19 is its pushing spring,
The valve body 18 is pressed in the direction of the piston within the valve chamber 20. The valve body 18 has a groove 18a for introducing gas at the tip that contacts the valve nozzle 5, and has a third seal ring 21 fitted to the outer tapered portion.

Reference numeral 22 denotes a magnetic holding yoke that is loosely fitted around the outer periphery of the socket 11. The yoke 22 is formed into a shallow circular dish shape that is open to the side where the gas cylinder is installed, and its edge 23 contacts the flange 3 of the gas cylinder 1 around the entire circumference. . 24
25 is a circular annular magnet that is magnetically attracted to the circular housing portion of the yoke 22, and is housed inside the edge 23. The magnet 25, the yoke 22, and the flange 3 form a magnetic circuit. hold magnetically.

The yoke 22 is made of a magnetic material and attracts and holds the gas cylinder 1 up to a temperature that does not pose a problem in the use of gas appliances, but when the temperature rises above a set temperature, it becomes a non-magnetic material or is made of a material that significantly weakens its magnetism. It is formed by Such materials include Fe−Ni−
A metal magnetic material for a temperature-sensitive element made of a ternary alloy of Cr is optimal. The maximum magnetic flux density is large, the temperature change rate of the saturation magnetic flux density is rapid near the Curie point, and the B-H curve has linearity over a wide temperature range below the Curie point, and the saturation magnetic flux density
Wide temperature setting range of 50 to 200℃ at 1000 Gauss,
This is because it is resistant to thermal and mechanical disturbances and can be plastically worked.

The set temperature at which the yoke 22 almost loses its magnetic force can be freely determined. Furthermore, the size of the diameter d ₂ of the piston 12 can also be freely set. Therefore, by combining the temperature conditions in which the yoke 22 almost loses its magnetic force with the conditions in which the cylinder pushing back effect by the pressure-sensitive piston 12 is maximized, it becomes possible to most effectively deal with the occurrence of abnormal situations. . However, even if the pressure-sensitive piston 12 is set to operate after weakening the magnetic force, the amount of work required is less than removing the gas cylinder using the pressure-sensitive piston alone; Even if the setting is such that the weakening of the pressure-sensitive piston becomes noticeable, the amount of work done by the pressure-sensitive piston will be less than that of the pressure-sensitive piston alone. Therefore, the pressure range in which the pressure-sensitive piston 12 operates and the temperature range in which the yoke 22 operates can be freely determined.

The yoke center opening 27 for loosely fitting the yoke 22 into the socket 11 is a protrusion 26 that passes through the center opening 26 with a notch 28 and locks the yoke 22.
It is provided protrudingly on the outer periphery of the socket 11. yoke 22
Since it is loosely fitted into the socket 11, it is magnetically attracted to the flange 3 around the entire circumference even if it is out of the plane orthogonal to the axis and is slightly inclined. 29 is pressure sensitive piston 1
The adjustment spring for 2 and 30 indicate the cap.

(Operation) The safety device of the present invention configured as described above senses when an abnormality occurs when the gas cylinder 1 is attached to the governor 10 and the gas appliance is being used, and operates as follows.

First, when the gas cylinder 1 is connected to the socket 11, the valve nozzle 5 is pressed against the valve body 18 against the closing spring 6, and the valve is opened to discharge gas into the governor 10.

Now, if the gas cylinder 1 is heated and the internal pressure increases while the gas appliance is in use, the pressure in the socket 11 inside the pressure-sensitive piston 12 will increase relatively, so the piston 12 will receive an outward force. Try to move outward. Therefore, the piston 12 acts in a direction to remove the gas cylinder 1 from the governor 10 through the valve base portion 2a in contact with the push-back portion 14.

Furthermore, if an abnormality in the gas appliance appears on the heating surface, the magnetic force of the yoke 22 weakens as the temperature reaches the set temperature range, and the magnetic coercive force acting between the yoke edge 23 and the flange 3 of the gas cylinder 1 weakens. . As mentioned earlier, in a setting where the increase in the operating force of the pressure-sensitive piston 12 and the decrease in the magnetic holding force of the yoke 22 work synergistically, when abnormalities in temperature and pressure reach the set values, the gas cylinder is removed from the governor. At the same time as the push-back pressure is applied, the magnetic force holding the gas cylinder 1 also rapidly decreases, so that the gas cylinder 1 is instantaneously removed from the governor 10.

On the other hand, in a setting in which either the pressure-sensitive piston 12 or the yoke 22 is used as the main force and the other is used as an auxiliary, the gas cylinder 1 may come off due to a decrease in the magnetic force when it is about to come off due to the push-back force of the pressure-sensitive piston 12. Alternatively, when the gas cylinder 1 is about to come off due to a decrease in magnetic force, the push-back force of the pressure-sensitive piston 12 is applied, causing the gas cylinder 1 to come off.

After the safety device is activated, if the temperature drops below the set value, the magnetic holding power of the yoke 22 is restored. The pressure-sensitive piston 12 does not interfere with installing the gas cylinder 1 regardless of the pressure, but even if the valve nozzle 5 is inserted into the pressure-sensitive piston, the piston 12 will be activated immediately if the internal pressure of the cylinder is high. Therefore, incorrect installation can be avoided. However, if the internal pressure of the cylinder is not completely reduced, the magnetic force of the yoke 22 will not recover, so gas will not be erroneously discharged continuously.

(Effects) Therefore, according to the present invention, the pressure-sensitive piston provided in the part that magnetically holds the gas cylinder and the yoke, which is the magnetically holding member itself, are capable of sensing and detecting abnormalities in pressure and temperature, respectively. Since the actuation means is provided, the reliable and easy operation of attaching and detaching gas cylinders using magnets is not impaired.
Since the above two means act synergistically or mutually auxiliary against abnormal situations such as excessive heating of the gas cylinder, safety is significantly increased and the practicality of this type of gas appliance can be improved. .

[Brief explanation of drawings]

The drawings show an embodiment of the safety device for gas appliances according to the present invention, and FIG. 1 is a cross-sectional view before the gas cylinder is installed, and FIG. 2 is a cross-sectional view after the gas cylinder is installed. 1... Gas cylinder, 5... Valve nozzle, 10... Governor, 11... Socket, 12... Pressure sensitive piston, 2
2... York.

Claims (1)

[Claims] 1. A pressure-sensitive piston that slides in the direction of removing the gas cylinder due to an abnormal increase in the pressure inside the socket is installed in a socket formed in a gas appliance to connect the valve nozzle of a gas cylinder, and the gas cylinder is connected to the outside of the socket. A yoke is provided that is held by magnetic force, and the yoke is made of a magnetic material up to a certain temperature.
1. A safety device for gas appliances, characterized in that it is made of a material that exhibits non-magnetism or whose magnetism significantly weakens beyond this range.