JPH02140508A - Safety device for gas fittings - Google Patents

Abstract

PURPOSE:To avoid the dangers of abnormality, such as overheating of a gas bomb, by incorporating at the socket in the gas fittings a pressure-sensitive piston for detaching a gas bomb in the case of abnormal rise of the pressure and by making a yoke, which holds a gas bomb on the outer side of the socket, from a material which remains a magnetic material up to a specified temperature and, above it, loses the magnetism or becomes only feebly magnetic. CONSTITUTION:When a gas bomb 1 is connected with a socket 11, the valve nozzle 5 is pushed in and the valve opens to let gas into a governor 10. When, during the use of the gas fittings, heating of the gas bomb 1 causes the inner pressure to rise, an outwardly acting force is exerted on a pressure-sensitive piston 12 in such a way as to move it outward and consequently on the gas bomb 1 in such a way as to detach it from the governor 10. When abnormality causes heating of the gas fixtures to a prescribed range of temperature, the magnetic force of the yoke 22 is enfeebled and consequently the gas bomb 1 is instantaneously detached from the governor 10 through deterioration of the magnetic holding power between the rim 23 of the yoke and the flange 3 of the gas bomb 1. This constitution secures enhanced safety against abnormality such as excessive heating of a gas bomb without impairing the assuredness and facility of the magnet-aided handling of the gas bomb.

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 is thought that the cause of this is mainly due to incorrect usage or usage that is not normally expected, measures were taken to prevent such usage.
No. 81, etc.).

(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, but this was structurally complex and difficult to use, and there was a risk of failure. A cylinder holding mechanism using magnets was developed.

Even with a mechanism that magnetically holds a gas cylinder using a magnet, measures against overheating of the gas cylinder are necessary. Therefore, various measures have been considered for safety devices in case magnetic type 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 provide a gas cylinder that can avoid danger by dealing with abnormal situations such as overheating of gas cylinders, without impairing reliable and easy gas cylinder attachment/detachment operations using magnets. The purpose of the present invention is to provide a safety device for equipment.

(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 is provided outside the socket to hold the gas cylinder by magnetic force, and the yoke is made of a material that is magnetic up to a certain temperature, but becomes non-magnetic or becomes significantly weaker when the temperature exceeds that temperature. This is achieved by a safety device for gas appliances characterized by the following.

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 gas cylinder 1
A mountain cup is provided at one end, 3 is a circular ring-shaped flange forming a part of the mountain cup, 4 is a valve mechanism attached to the mountain cup 2, and a retractable valve nozzle 5 provided thereon is moved in the projecting direction. It has a built-in closing spring 6 that opens the valve in a biased state. 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 assumed to be d.

10 is a socket 11 for connecting the valve nozzle 5;
The governor 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, and the diameter of the piston 12 is d2, which is sufficiently larger than the effective diameter d1 of the valve nozzle 5. shall be. The pressure sensitive piston 12 is on the front side,
It has a push-back part 14 that is recessed to a size that receives the valve stand part 2a at the center of the mountain cup, and a through hole part 15 that receives the valve nozzle 5 is opened in the center. A first seal ring 16 fits on the outer periphery of the piston 12 and maintains a seal with the wall surface of the sliding chamber 13, and 17 fits on an inner periphery of the through hole portion 15 to maintain a seal with the valve nozzle 5. This is the second seal ring. At the back of the sliding chamber 13, a pressure introducing chamber 13' having the same diameter as the sliding chamber 13 is provided.

On the governor side, 18 is a valve body whose tip is in contact with the piston 12, and 19 is its pushing spring, which presses the valve body 18 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 in a part of the outer taper.

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. . Reference numeral 24 denotes a circular housing portion of the yoke 22, and 25 denotes a circular annular magnet that is magnetically attracted thereto, and is housed inside the edge 23. The magnet 25, the yoke 22, and the flange 3 form a magnetic circuit, and the gas cylinder is 1 is held magnetically.

The yoke 22 is made of a magnetic material and attracts and holds the gas cylinder 1 up to a temperature that poses no problem in using the gas appliance, but becomes non-magnetic or is made of a material that significantly weakens its magnetism when the temperature rises above a set temperature. be done. As such a material, a metal magnetic material for a temperature-sensitive element made of a ternary alloy of Fe-Ni-Cr is most suitable. It has a large maximum magnetic flux density (the temperature change rate of the saturation magnetic flux density near the Curie point is rapid, the B-H curve shows linearity over a wide temperature range below the Curie point, and the saturation magnetic flux density is 1000 Gauss). This is because the temperature setting range is wide (50 to 200°C), it is resistant to thermal and mechanical disturbances, and it can be plastically worked.

The set temperature at which the yoke 22 almost loses its magnetic force can be freely determined. Further, the size of the diameter d2 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.

Note that 26 is a yoke center opening for loosely fitting the yoke 22 into the socket 11, and 27 is a protrusion that passes through the central opening 26 with a notch 28 and locks the yoke 22, and is provided protruding from the outer periphery of the socket 11. Since the yoke 22 is loosely fitted into the socket 11, it magnetically attracts the flange 3 around the entire circumference even when it is out of the plane orthogonal to the axis and slightly inclined. 29 is an adjustment spring for the pressure-sensitive piston 12, and 30 is a base.

(Function) 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 IO and the gas appliance is used, and operates as follows.

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

If the gas cylinder 1 is heated and the internal pressure increases while the gas appliance is being used, the pressure in the socket 11 inside the pressure-sensitive piston 12 will increase relatively, so the piston 12
tries to move outward in response to an outward force. 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.
The magnetic coercive force acting between the yoke edge 23 and the flange 3 of the gas cylinder 1 is weakened.

As mentioned earlier, an increase in the operating force of the pressure-sensitive piston 12,
In a setting where the decrease in the magnetic holding force of the yoke 22 works synergistically, when abnormalities in temperature and pressure reach the set values, the magnetic force that was holding the gas cylinder 1 is also reduced at the same time as the pressure is applied to push the gas cylinder back from the governor. As the pressure drops rapidly, the gas cylinder 1 is momentarily removed from the governor IO.

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 magnetic force when it is about to come off due to the push-back force of the pressure-sensitive piston 12, or When the gas cylinder 1 begins to come off due to the 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 the installation of the gas cylinder 1 regardless of the pressure, but even if the valve nozzle 5 is inserted into the pressure-sensitive piston, if the internal pressure of the cylinder is high, the piston 12 will immediately close.
This allows you to avoid incorrect installation. However, if the cylinder internal pressure has not completely decreased, 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, can sense and operate in response to pressure abnormalities and temperature abnormalities, respectively. Since this means is provided, the reliable and easy operation of attaching and detaching the gas cylinder using the magnet will not be impaired. This significantly increases safety and improves the practicality of this type of gas appliance.

[Brief explanation of the drawing]

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, lO...
- Governor, 11...Socket, 12...Pressure-sensitive piston, 22...Yoke. Patent applicant

Claims (1)

[Claims] A pressure-sensitive piston that slides in the direction of removing the gas cylinder due to an abnormal rise in 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 attached to the outside of the socket using a magnetic force. A safety device for gas appliances, characterized in that the yoke is made of a material that is magnetic up to a predetermined temperature, but becomes non-magnetic or becomes significantly weaker in magnetism above that temperature. .