JPH0926134A - Pressure sensing safety device for gas appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reset a pressure sensing safety device in conjunction with a knob operation of a gas appliance. SOLUTION: A restraining member 12 is provided in a device body 10 to restrain a valve spindle 11 which has been moved by an abnormal rise of pressure to put a gas passage into a closed state. In order to set free the spindle by operating a knob 13 of an appliance plug provided in a gas appliance, an engaging element 14, which can contact a part of the member 12, is provided on the knob 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a pressure adjusting mechanism for adjusting the pressure of gas discharged from a small gas container, and a valve shaft which is moved by an abnormal increase in the pressure of the gas and closes the gas passage. The present invention relates to a pressure sensing safety device for a gas appliance having the same.

[0002]

2. Description of the Related Art In a gas appliance using a small gas container, a safety device that senses an abnormal rise in pressure and operates to stop the supply of gas is conventionally known. However, since the conventional reset device attached to this type of safety device was a manual type, there was a drawback that the reset method could not be understood unless the gas appliance was carefully examined and the cautionary notes were reread.

In addition, the conventional pressure sensing safety device has a secondary pressure,
In other words, it is a system in which the primary pressure of the raw gas discharged from the gas container is adjusted by a pressure adjusting mechanism and the pressure obtained is sensed to operate. For this reason, the gas once enters the pressure regulation chamber from the primary side and again enters the pressure regulation chamber.
Since it goes to the secondary side, it is necessary to shut off the primary side and the secondary side, so that the structure is complicated and the number of parts is large.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object thereof is to enable automatic resetting by a picking operation of a gas appliance. Another object of the present invention is to rationalize the structure of the pressure sensing safety device and reduce the number of parts.

[0005]

In order to solve the above-mentioned problems, the present invention relates to a pressure-sensing safety device for a gas appliance that uses a small gas container, and restricts the gas by restraining the valve shaft 11 that has moved due to an abnormal increase in pressure. A restraint member 12 for keeping the passage closed is provided in the apparatus main body 10, and the restraint member 12 is moved by operating the knob 13 of the instrument plug provided in the gas appliance to release the valve shaft 11 from the restraint. The means for providing the engaging portion 14 that can come into contact with the member 12 between the knob 13 is provided.

In the safety device of the present invention, for example, when the gas container is heated by misuse and the primary pressure rises abnormally, the valve shaft 11 moves to close the gas passage, so that the gas supply is immediately stopped. It In this stopped state, the valve shaft 11
Is constrained by the constraining member 12, so that it is maintained unless the constraint is released.

The restraint member 12 is capable of contacting the engaging portion 14 provided on the knob 13 in order to release the restraint. Therefore, by operating the knob 13 in the direction of "erase" shown by the arrow in FIG. 2, the constraint of the valve shaft 11 is released and the valve shaft 11 is automatically reset (see FIG. 4).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure sensing safety device of the present invention comprises:
It can be incorporated into a gas appliance A such as a stove as shown in FIG. This type of gas appliance A uses a small gas container C, and a pressure adjusting mechanism 2 for adjusting the raw gas (gas whose pressure is not adjusted) discharged by connection to a substantially constant pressure.
The pressure-adjusted gas is supplied to the operating part B, for example, the combustion part in FIG.

The pressure adjusting mechanism 20 is also called a governor, a pressure reducer or the like.
It is provided in relation to 0, and operates by sensing an abnormal rise in gas pressure. Although various types and structures of the pressure sensing safety device can be adopted, in the present invention, the pressure sensing safety device needs to have a valve shaft 11 that is moved by an abnormal increase in pressure and closes the gas passage.

The valve shaft 11 is like a piston, and a part of the valve shaft 11 is incorporated in a cylinder type chamber provided in the apparatus main body 10 so as to be movable in the axial direction. A restraint member 12 that restrains the valve shaft 11 that has moved due to an abnormal increase in pressure and keeps the gas passage from the gas container C to the pressure adjusting mechanism 20 closed is provided in the apparatus body 10.

The valve shaft 11 according to the embodiment is shown in FIGS.
As shown in FIG. 6, it is formed in a straight line, and the inner end portion (34) is arranged in the gas passage formed by the cylinder type chamber, and the outer end portion is directed outward from the apparatus main body 10. It can be projected.

As an example, the restraint member 12 includes a valve shaft 11
The valve shaft 11 is rotatably supported by the main body 10 so as to be rotatable about an axis parallel to the axial direction, and is formed at the intersecting position of the rotation surface of the restraining member 12 of the valve shaft 11 protruding outward due to an abnormal increase in pressure. It is possible to engage with the concave (or convex) engaging portion 15. Reference numeral 19 indicates an engaging partner with the engaging portion 15. Therefore, the restraint member 12 is pressed in the engaging direction by the elastic body 27 such as a spring.

Further, the restraint member 12 of the embodiment is formed in a three-pronged shape, and a branch portion 16 for pivotally supporting each branch portion of the branch member so as to be rotatable about an axis parallel to the axial direction of the valve shaft 11, and a knob. The pressing portion 17 for contacting with the engaging portion 14 of 13 and the restraining member 1
2 can be directly operated to be applied to the manual portion 18 for releasing the restraint of the valve shaft 11. Further, based on the three-pronged shape, the dogleg-shaped concave portion formed between the shaft support portion 16 and the pressing portion 17 can be used as an engaging partner for engaging with the engaging portion 15.

The gas appliance A is provided with an appliance plug 28, and the engaging member 14 is operated to release the restriction of the valve shaft 11 by moving the restricting member 12 in conjunction with the movement of the knob 13 for operating the appliance. Is provided between the restraint member 12 and the knob 13.

The knob 13 as an embodiment is attached to the shaft 29 of the instrument plug 28 and is rotated to open / close and adjust the flow rate of the gas toward the adjusted operating portion B. Further, the engaging portion 14 as an embodiment is integrally provided on the back side of the knob 13,
It can be brought into contact with the pressing portion 17 of the restraint member 12, and the knob 13
Is rotated to the “disappearing” method to push the restraint member 12 against the elastic body 27, and the engagement partner 19 is disengaged from the engagement portion 15 (FIG. 4).

An embodiment of the pressure adjusting mechanism 20 and a pressure sensing safety device arranged in parallel therewith will be described with reference to FIGS. When the nozzle valve N is connected to the connection port 21 provided in the main body 10, the check valve 22 for opening the nozzle valve N is connected to the connection port 2
It is provided inside 1. The check valve 22 is incorporated in a check valve receiver 31 fixed at the back of the connection port together with a nozzle valve opening spring 32, and a gas passage hole 24 for flowing the raw gas passing through the check valve 22 toward the pressure regulating chamber 23. Is provided in the check valve receiver 31.

The connection port 21 side is connected to a straight pressure sensing chamber 30 provided in the inner part thereof, and the valve shaft 11 is accommodated in the pressure sensing chamber 30 so as to be movable in the axial direction. The pressure sensing chamber 30 has a maximum diameter on the side of the connection port 21, and has a structure in which chambers having different inner diameters are provided stepwise between the outlets 33 that bring the tip of the valve shaft 11 to the outside.

Then, due to the abnormal increase in pressure, the valve shaft 11
Valve shaft 11 so that the gas passage is closed when the
The sealing means 25 is attached to the pressure receiving portion 34 at the inner end of the gas passage 26, and the gas passage hole 26 communicating with the pressure regulating chamber from the gas passage is provided below the sealing means 25.
Is formed. In other words. Gas passages 24 and 26 are provided on the upstream and downstream sides of the sealing means 25. The sealing means 25 is a means for closing the gas passage between the two communication ports 24 and 26, and for example, the illustrated O-ring can be used. In this way, by introducing the raw gas discharged from the gas container C into the pressure regulation chamber 23 through the pressure sensing safety device, the structure for shutting off the primary side and the secondary side becomes unnecessary, and the structure is simplified. It

Numeral 35 is a pressure setting means, which sets the valve shaft 11 to 1
It is shown as a coil spring that pushes against secondary pressure. 36
Is a seal ring, which is O-like the sealing means 25.
Rings are used. Sealing means 25, seal ring 3
Even if 6 is provided on the main body side, the operation is the same. Reference numeral 37 is a diaphragm, 38 is a pressure adjusting spring, and 39 is a gas passage which flows from the pressure adjusting chamber 33 to the operating portion B via the instrument plug 28.

[0020]

Since the present invention is constructed and operates as described above, by operating the knob 13 of the gas appliance, the engaging portion 14 moves the restraining member 12 to restrain the valve shaft 11. It is possible to cancel the operation, and it is possible to perform automatic resetting, and it is possible to prevent the user from being confused by not knowing the operation unit for resetting.

[Brief description of drawings]

FIG. 1 is a perspective view of a gas appliance incorporating the pressure sensing safety device of the present invention.

FIG. 2 is an exploded perspective view showing a main part of the same apparatus.

FIG. 3 is a plan view of the same device.

FIG. 4 is a front view of the same.

FIG. 5 is a sectional view of the same viewed from both sides.

FIG. 6 is a cross-sectional view seen from the same plane direction.

Claims (5)

[Claims] 1. A pressure sensing safety device comprising a pressure adjusting mechanism for adjusting the pressure of gas discharged from a small gas container, and having a valve shaft which is operated by an abnormal increase in the pressure of the gas and closes a gas passage. The apparatus body 10 is provided with a restraining member 12 that restrains the valve shaft 11 that has moved due to an abnormal increase in pressure to keep the gas passage closed, and operates the knob 13 of the instrument plug provided in the gas appliance. Therefore, in order to move the restraint member 12 and release the valve shaft 11 from the restraint, an engaging portion 14 that can come into contact with the restraint member 12 is provided between the knob 13 and the gas appliance pressure. Sensing safety device. 2. The restraint member 12 is rotatably supported about an axis parallel to the axial direction of the valve shaft 11, and the restraint member for the valve shaft 11 that has moved axially due to an abnormal increase in pressure. The pressure sensing safety device for a gas appliance according to claim 1, wherein an engaging portion 15 that is engageable with the restraining member 12 is formed at an intersecting position with the rotating surface of 12. 3. The restraining member 12 includes a shaft supporting portion 16 for pivotally supporting a shaft about a shaft parallel to the axial direction of the valve shaft 11.
A pressing portion 17 for contacting the engaging portion 14 of the knob 13,
The pressure sensing safety device for a gas appliance according to claim 1, further comprising a manual portion 18 for directly operating the restraining member 12 to release the restraint of the valve shaft 11. 4. The engaging portion 14 is integrally provided on the back side of the knob 13 and can come into contact with the pressing portion 17 of the restraint member 12, and the engaging portion 14 is restrained by rotating the knob 13 in the "erasing" direction. The pressure sensing safety device for a gas appliance according to claim 1, wherein the pressure sensing safety device is configured to push the member 12 against the elastic body 27. 5. The pressure adjusting mechanism 20 includes a check valve 22 provided in a connection port 21 for connecting a nozzle valve of a gas container C, and a pressure adjusting chamber 23 of the pressure adjusting mechanism 20 in which gas discharged by the connection is provided.
Valve shaft 1 installed in the gas passage flowing to
1, a sealing means 25 provided between the wall surface of the gas passage and the valve shaft 11 so that the gas passage is closed when the valve shaft 11 moves due to an abnormal increase in pressure, and the sealing means 2
5. The pressure sensing safety device for a gas appliance according to claim 1, further comprising a gas through hole 26 formed so as to pass through the gas passage and the pressure adjusting chamber 23 at the lower side of the pressure gauge 5.