JPH0330697Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a safety device for a cassette stove.

(Prior Art) A safety device that senses an abnormal increase in the pressure of gas in a cylinder and stops the gas from flowing out is known, for example, from Japanese Patent Publication No. 57-54680.
The above invention allows resetting by removing the cylinder, and relies on automatic reversal of the disc spring after the cylinder is removed. Therefore, it is important to set the reversal stroke and reversal load of the disc spring, but this setting is very difficult.

(Technical Problem) The purpose of the present invention is to solve the above-mentioned problems, and to be able to immediately stop the outflow of gas when the cylinder becomes overheated due to incorrect usage and the pressure of the gas inside the cylinder rises abnormally. To provide a safety device for a cassette stove, in which a reset operation for causing gas to flow out again when returning from a stopped state to a safe state can be easily performed from the outside without removing the cylinder.

(Technical Means) The above purpose is to insert the valve nozzle 2 into the valve cylinder body 5 which has a gas inlet 3 into which the valve nozzle 2 is fitted when the cylinder 1 is installed, and a gas outlet 4 which supplies gas to a burner etc. The first spring 7 acts in the opposite direction to the first spring 7 which pressurizes the check valve 6 in the direction of the valve nozzle 2 and flows through the valve cylinder body 5. A second spring 8 that senses the temperature of the gas and responds thermally is interposed therein, and an engagement recess 9 is provided on the sliding surface of the check valve 6 outward from the sealing part, and the direction of engagement with the second spring 8 is provided. This is achieved by a configuration in which the valve cylinder body 5 is provided with the engaging element 10 that is biased by the force.

(Example) To explain with the illustrated example, the cylinder 1 is removably installed in a housing part provided on one side of the gas stove 12 (see FIG. 3), and a valve nozzle is connected to the gas inlet 3 of the valve cylinder body 5. 2 and attach/detach lever 33, which will be described later.
When the valve nozzle 2 is operated, the valve nozzle 2 is retracted into the cylinder and the gas flows out, and the gas is sent from the gas outlet 4 to the burner 14 via the governor 13.

As shown in FIGS. 1 and 2, the valve cylinder body 5 is located at the front portion 1.
5. Consisting of a rear part 16, O-rings 17, 18 and a cap 1 are attached to the front part 15, which has a hole for the gas inlet 3 in the center.
9 is installed. Note that FIG. 1 shows the state before the safety device is activated, and FIG. 2 shows the state in which the safety device is activated. The check valve 6 has a shaft-like shape with a tip 21 having a gas passage 20 in contact with the valve nozzle 2 and a rear end forming a reset portion 11, and the shaft portion is fitted with an O-ring 11.
A, the first coiled spring 7 is housed in the middle cylindrical spring tube 22, and the second spring made of a temperature sensitive material such as a shape memory alloy is placed between the outer step 23 and the front part 15. Attach spring 8 and use the first spring during use.
O-ring 24 attached to the tip neck with the force of spring 7.
is pressurized in the direction of the seat 25 of the front portion 14. The outer periphery of the other end of the spring cylinder 22 of the check valve 6 is a sliding surface 27 that comes into sliding contact with the hole wall 26 of the valve cylinder body 5, and the surface 27 is engaged as part of the means for fixing the check valve position. A recess 9 is provided.

The engaging recess 9-1 of the embodiment shown in FIG. 1 has a spherical shape, and engages the spherical engaging element 10-1 housed in the small hole 28. Numeral 29 is a small spring that urges the engaging element 10-1 in the engaging direction, and 30 is an adjuster that adjusts the strength of engagement, and is movable forward and backward by a threaded portion 31. Note that the spherical engaging element 10-1 is released from engagement by operating the reset portion 11. The reset portion 11 is provided so as to be externally operable by adding a structure that interlocks with an instrument stopper or the like, or by protruding the reset portion 11 to the outside.

In the example shown in FIG. 2, a small groove is provided in the sliding surface 27 as an engagement recess 9-2, and an engagement shaft 32 that engages with it is housed in a small hole 33, biased by a small spring 34, and the tip is shaped like a shaft. The engagement element 10-2 is used to pull out the engagement shaft 32 outward to release the engagement. 35 indicates a knob.

(Operation of the invention) In the above structure, when the cylinder 1 is set in a predetermined position, the valve nozzle 2 opens while the check valve 6 is moved backward, and gas enters the valve cylinder body 5 from the inlet 3 due to gas pressure. Since it is in a state where it can flow out from the outlet 4, it can be ignited by operating the knob 35.

Now, due to an unusual mode of action, the cylinder is heated, the temperature of the gas discharged from the valve nozzle 2 increases, and the temperature passing through the second spring formed by the temperature-sensitive member reaches a predetermined temperature, e.g. As shown in the figure, when the cylinder internal pressure is 4Kg/ ^cm2 , it is approximately 59℃, and the same is 6Kg/ ^cm2.
When the temperature reaches approximately 69°C, the spring 8 expands due to the heat, causing the check valve 6 to retreat, and as a result, the valve nozzle 2 protrudes due to the built-in spring, stopping gas discharge from the cylinder 1. and the check valve 6 is the engager 1
0-1 and 10-2 are kept in the retracted state by engaging with the engaging recesses 9-1 and 9-2 (the state shown in FIG. 2). FIG. 4 is a graph showing abnormal increases in temperature and gas pressure at various parts due to incorrect usage. In the figure, the solid line is the cylinder internal pressure, the dotted line is the cylinder bottom temperature,
The dashed-dotted line indicates the socket temperature, A indicates the case where the cylinder is covered with a large iron plate, and B indicates the case when the trivet is used upside down.

Heating to the cylinder 1 is removed, and the valve cylinder body 5
When the temperature returns to normal temperature, the second spring 8 also returns to its normal state (the state shown in FIG. 1), but each of the engagers 10-1,
10-2 remains engaged. Engagement element 10-1
When the engaging recesses 9-1 and 10-2 are disengaged from each other, the temperature of the cylinder 1 and the present device decreases,
Alternatively, perform the reset operation after eliminating the cause of the abnormality by replacing the cylinder, etc. In the example of FIG. 1, when the reset portion 11 is pressed, the valve nozzle 2 is pushed inward, so that it can be ignited again. Engagement shaft 3
By simply pulling 2 outward, the check valve 6 is reset to its normal state in which the first spring 7 is in balance with the second spring 8.

(Effect of the invention) Therefore, according to the invention, an abnormal rise in the temperature inside the cylinder or in the valve cylinder body 5 is detected by the activation of the safety device, and the check valve 6 immediately stops the gas outflow to ensure safety. At the same time, the operating state of the safety device is maintained by the engagement of the engagement recess 9 and the engagement element 10, so there is no risk of gas leakage occurring unnoticed due to the return of internal pressure, and it is easy to reset. Because it can be performed with simple operations, it is possible to
There is no need to attach or detach the parts, making it extremely easy to handle.

[Brief explanation of drawings]

The drawings relate to a safety device for a cassette stove according to the present invention, and FIG. 1 is a sectional view, FIG. 2 is a sectional view of a modified example, FIG. 3 is a plan view, and FIG. 4 is a graph. 1...Cylinder, 2...Valve nozzle, 3...Gas inlet, 4...Gas outlet, 5...Valve cylinder body, 6...
Check valve, 7...first spring, 8...second spring,
9... Engagement recess, 10... Engagement element.

Claims (1)

[Scope of utility model registration request] When the cylinder 1 is installed, the valve nozzle 2 is inserted into the valve cylinder body 5 which has a gas inlet 3 into which the valve nozzle 2 is fitted, and a gas outlet 4 which supplies gas to a burner etc., and one end is pushed by the valve nozzle 2 to open the valve. Built-in stop valve 6,
The first pressurizes the check valve 6 in the direction of the valve nozzle 2.
A second spring 8 which acts in the opposite direction to the spring 7 and which thermally responds by sensing the temperature of the gas flowing inside the valve cylinder body 5 is interposed. A safety device for a cassette stove, in which an engaging recess 9 is provided on the sliding surface of the valve body 5, and an engaging element 10 biased in the direction of engagement with the engaging recess 9 is provided in the valve cylinder body 5.