JP2650220B2 - Safety devices for gas appliances - 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 device having a structure in which a gas appliance used with a detachable gas container mounted thereon is configured to push the gas container off when the gas pressure rises abnormally. is there.

[0002]

2. Description of the Related Art In a gas appliance using a small gas container commonly called a cassette, a cartridge or a gas cylinder, a safety device for stopping the outflow of gas when the pressure in the gas container rises abnormally is disclosed in Japanese Patent Publication No. 57-68080. Japanese Patent Publication No. 4-74605 discloses a safety device which is known by the invention of Japanese Patent Application Laid-Open No. HEI 7 (1995) and pushes out a gas container at an abnormally high pressure. The latter invention has a pressure-sensitive piston slidably incorporated in the room, and when the pressure rises abnormally, the piston pushes the base around the valve nozzle.

The pressure receiving area of a pressure-sensitive piston is determined only by the inner diameter of a chamber in which a seal member mounted on the outer periphery of the piston slides. However, in some cases, the pressure-sensitive piston did not start moving even when the pressure reached the set value. This is thought to be due to the difference in the spring force, the magnitude of friction and other resistance, or the variation in the action of the magnet holding the gas container, but the pressure-sensitive piston ensures that the gas container is pushed out. According to the conventional concept, there is a problem that the pressure receiving area must be increased, which leads to an increase in the size of the device.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the problem is that when the pressure in the gas container rises abnormally, it does not depend on the variation of each part. It is another object of the present invention to operate the pressure-sensitive piston smoothly and to surely release the gas container at a set value.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a safety device for a gas appliance in which a pressure-sensitive piston slidable in a direction to push and release a gas container is incorporated in a valve chamber. A small valve chamber 16 having a larger diameter than the outer diameter and a smaller diameter than the inner diameter of the valve chamber 14 is formed in the inner part of the valve chamber 14, and comes into contact with the peripheral surface of the small valve chamber 16 so that the pressure-sensitive piston 12 receives the first pressure. A first seal member 17 for setting the area is provided at the inner end of the pressure-sensitive piston 12, and a second seal member 18 in contact with the cylindrical peripheral surface of the valve chamber 14 is disposed outside the first seal member 17. 12 to control the pressure-sensitive piston 12 against internal pressure.
A spring 19 acting in the opposite direction is connected to the piston 12 and the valve.
It is installed between the outdoor part and the strength of the spring 19 is abnormal.
When pressure is applied to the first seal member 17,
Set the strength to release the
The first seal member 17 moves in the direction to release the seal by force
So that the outer end 24 of the pressure sensitive piston 12 and
In which it took measures that Ru a gap A between a portion of the contactable gas container B.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A portion for connecting a valve nozzle N of a gas container B is provided at a portion for introducing gas to a governor 13. In the apparatus of the present invention, a valve chamber 14 for incorporating a pressure-sensitive piston 12 is formed therein. ing. The pressure-sensitive piston 12 is formed in a cylindrical shape having a hole 21 penetrating through the center thereof.
Is a receiving port 1 for inserting the valve nozzle N
It is 1. Reference numeral 22 denotes a seal ring which is in contact with the outer periphery of the valve nozzle N and determines the pressure receiving area thereof. Reference numeral 23 denotes a mounting recess of the ring 22, which is provided inside the outer end of the pressure-sensitive piston 12.

The hole 21 penetrating the center is formed slightly larger in diameter than the receiving port 11, and a valve opening member 20 for opening the valve by pressing the connected valve nozzle N is provided therein. 25 is a valve-opening spring of the member 20;
1 ′ is shown (see FIG. 3). The valve chamber portion slidably housing the pressure-sensitive piston 12 has a cylindrical peripheral surface. In a state where the pressure-sensitive piston 12 is pushed to the innermost position by the spring 19, that is, in a normal state, the outer end 24 of the pressure-sensitive piston 12 is separated from the nozzle base P around the valve nozzle N by the gap A ( (See FIG. 3).

A small valve chamber 16 having a sectional area smaller than that of the valve chamber 14 is formed at the back of the valve chamber 14. In the first embodiment shown in FIGS. 1, 3 and 4, the small valve chamber 16 is tapered and has a tapered slope.

In order to set the initial pressure receiving area of the pressure sensitive piston 12 in contact with the peripheral surface of the small valve chamber 16, a first seal is provided at the inner end of the pressure sensitive piston 12 having a radius larger than the radius of the valve nozzle N. A member 17 is provided. Reference numeral 27 denotes a circumferential groove into which the seal member 17 is fitted. Further valve room 1
The second sealing member 18 slidingly contacting the cylindrical peripheral surface of
It is provided on the peripheral surface of the pressure-sensitive piston 12 outside the seal member 17. 28 is a circumferential groove in which the second seal member 18 is fitted. Reference numeral 29 denotes a dust-proof seal member slidably provided at the front of the pressure-sensitive piston.

In the second embodiment shown in FIGS. 5 and 6, the small valve chamber 16 is formed in a small cylindrical shape coaxial with the valve chamber 14, and the inside diameter of the small valve chamber 16 is outside the valve nozzle N. The seal member 17 is sufficiently larger than the diameter and can slide into the valve chamber 16.

The first seal member 17 in the second embodiment is
It is fitted in a circumferential groove 42 at the front end of a substantially T-shaped mounting member 41 provided at the front end of the pressure-sensitive piston, and when it moves axially outward by a distance C from a normal sealing state, the sealing effect of that portion is obtained. Is set to disappear.
This distance C is sufficiently smaller than the gap A described above, and the piston outer end 24 does not act on the nozzle base P even if the pressure-sensitive piston 12 moves by the distance C.

Therefore, in the case of the second embodiment, the pressure at which the safety device operates is easier to set than in the case of the first embodiment. Other configurations may be the same as those in the first embodiment, and a description thereof will be omitted, and reference numerals will be used.

The holding mechanism 15 for holding the gas container B has a circular annular flange f surrounding the valve nozzle N of the gas container B.
The magnet is provided with an annular magnet 30 and a circular dish-shaped holding yoke 31 containing the magnet 30 as magnetic holding means. The holding yoke 31 for magnetic attraction is
It is fitted into a cylindrical mounting part 32 around the governor connection part, and is mounted so as to be able to swing without being detached by a retaining ring 33 made of a collar. Numeral 34 denotes a positioning projection, which protrudes from the upper part of the holding yoke and engages with an engaging portion formed in advance on the flange f.

Although the holding force of the gas container B by the holding mechanism 5 is naturally larger than the combined force of the pressing force of the valve opening member 20 and the normal gas pressure, the pressure-sensitive piston 12 pushes the nozzle base P around the valve nozzle. Less than the pressing force. When this relationship is arranged, the magnetic attraction force, the friction and other resistance of the seal ring 22, the pressing force of the valve-opening spring 25, the thrust on the valve nozzle N, the thrust on the first seal member 17, When the friction of the first seal member 17, the second seal member 18, and the seal ring 29, the pressing force of the spring 19, and the thrust applied to the second seal member 18, the normal balance is +> +, abnormal. The condition of time balance is +++, and the condition of release after valve opening is> ++.

When the acting force acting on the pressure-sensitive piston 12 at the time of the abnormality is shown in a graph, it is almost like a curve shown by a solid line in FIG. The numbers in FIG. 2 are the same as the above-mentioned numbers, and the balance in the normal state is a certain set pressure, for example, 5
Continue to kg / cm ² . The state of balance at the time of the abnormality is on a line including a point indicated by T1. Even when the internal pressure of the gas container rises to a point T1 at which the gas pressure reaches the set value, the piston 12 moves only by the distance c under abnormal pressure.
Thereafter, when the thrust applied to the second seal member 18 increases, the gas container B is quickly pushed out. Since the two-stage pushing-off force is applied to the pressure-sensitive piston 12 in this manner, an action of pushing the gas container with force is obtained.

In FIG. 1, reference numeral 35 denotes a pressure regulating chamber having a diaphragm valve 36, and 37 denotes a pressure regulating chamber 35 from the valve chamber 14.
An outlet passage 38 extending to the opening is an instrument plug for opening / closing a gas flow path for sending the regulated gas to a burner or other operation valve and adjusting the flow rate.

[0017]

Since the present invention is constructed and operates as described above, when an abnormally high pressure is applied, the pressure becomes smaller.
The first seal member 17 has a Sai pressure receiving area is easily
Motion, then different to have large pressure receiving area of the second seal member 18
Since the normal pressure acts, the pressure-sensitive piston 12 instantaneously moves through the gap A.
To hit a part of the gas container, so that the gas container can be removed by a two-stage pushing action. In particular, in the safety device of the present invention, the cross section of the valve nozzle N is defined as the pressure receiving area and
Can be set much larger pressure receiving area of the first seal member 17 than when it outside and available-pressed without being affected by it even if there are variations in the holding force of the gas container, the first seal member 17 <br/> Runode help the movement of the pressure-sensing piston 12 reliably caused to disengage the gas container by abnormal pressure according to the second seal member 18, an effect that it is possible to stabilize the operating pressure.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of a gas appliance safety device according to the present invention.

FIG. 2 is a graph illustrating the operation of the above device.

FIG. 3 is a vertical sectional view of a main part of the apparatus shown in FIG. 1;

FIG. 4 is a sectional view of a main part showing an operation state of the apparatus of FIG. 3;

FIG. 5 is an explanatory sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view of the same operating state.

Claims (5)

(57) [Claims] The gas container has a receiving port for connecting to a valve nozzle of the gas container. When the pressure of a gas discharged by the connection rises abnormally, the gas nozzle receives the pressure and slides in a direction to push the gas container. A possible pressure-sensitive piston 12 is incorporated in a cylindrical valve chamber 14 provided in a governor 13, and a holding mechanism 15 for holding a gas container B for connecting the valve nozzle N with a force equal to or less than the pushing-off force is provided. A safety device for a gas appliance provided in a gas container attaching / detaching portion, wherein the small valve chamber 16 has a larger diameter than the outer diameter of the valve nozzle N and a smaller diameter than the inner diameter of the valve chamber 14.
Is formed at the back of the valve chamber 14, and a first seal member 17 that contacts the peripheral surface of the small valve chamber 16 and sets the initial pressure receiving area of the pressure-sensitive piston 12 is provided at the inner end of the pressure-sensitive piston 12. ,
A second seal member (18) in contact with the cylindrical peripheral surface of the valve chamber (14) is provided on the pressure-sensitive piston (12) outside the first seal member (17), and acts in a direction to oppose the pressure-sensitive piston (12) to internal pressure.
Spring 19 is provided between the piston 12 and an outer portion of the valve chamber.
When the abnormal pressure is applied to the first seal member, the strength of the spring 19 is increased.
17 when it is compressed to release the seal
The first seal member 1 is set with the abnormal pressure.
7 so that it can move in the direction to release the seal.
Outer end 24 of stone 12 and gas container B with which it can contact
A safety device for a gas appliance , wherein a gap A is provided between the gas appliance and a part of the gas appliance. 2. The pressure-sensitive piston 12 is formed in a cylindrical shape having a hole penetrating the center portion, and the outside of the hole is a receiving port 11 having a seal ring 22 in contact with the outer periphery of the valve nozzle, and is connected thereto. A valve-opening member 20 urged by a valve-opening spring 25 that presses the opened valve nozzle N to open the valve is slidably provided in a hole inside the receiving port 11.
5. The combined force of the pushing force of No. 5 and the thrust applied by the normal gas pressure to the valve nozzle N is set so as to be smaller than the combined force of the holding force of the holding mechanism 15 and another force opposing the container removal. The safety device for gas appliances according to claim 1. 3. The pressure sensitive piston 12 under abnormal gas pressure.
2. The gas appliance according to claim 1, wherein the thrust for pushing the gas container B off is set so as to exceed the combined force of the pushing force of the spring 19, the holding force of the gas container B by the holding mechanism 15, and another reaction force. For safety devices. 4. The safety device for a gas appliance according to claim 1, wherein the peripheral surface of the small valve chamber (16) has a tapered slope. 5. The safety device for a gas appliance according to claim 1, wherein the peripheral surface of the small valve chamber 16 has a cylindrical curved surface.