JPH0346296Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to the provision of an automatic gas flow path shutoff mechanism for preventing overboiling of household bathtubs, boilers, etc.

``Prior Art'' Conventionally, there has been a method to prevent damage to household bath pots, boilers, etc. caused by over-boiling and empty cooking by turning off the gas. Some types use a temperature sensor to alert you with a buzzer when a predetermined temperature is reached, warning that if you continue cooking any longer, the cooking will become dry.

``Problem that the invention attempts to solve'' However, in the case of the above-mentioned means, if the buzzer notification temperature is set to a predetermined bathing temperature, etc., it will be possible to know that the bath has reached a suitable temperature, which is extremely convenient. However, in reality, the buzzer sound is often missed due to surrounding noise, making it impossible to reliably prevent dry cooking accidents.Furthermore, if the buzzer sound is heard, the operator is forced to turn off the gas valve. The disadvantage is that it is not fully automated.

``Means for solving problems'' and ``effects'' This proposal was developed in view of the circumstances described above, and its gist is that two sides are interposed in the middle of the gas pipe, and the other side is A cylinder opening/closing control valve that acts toward the three-way intersection is installed in the other pipe of the three-way pipe body, which is connected to the water side of the bathtub through a stopper lid made of a material with good heat conductivity. A tension spring for retracting bias and a pressure spring made of a shape memory alloy whose shape memory effect is set at a predetermined temperature are installed between the valve and the valve, and an engagement groove is formed in the peripheral wall of the cylinder opening/closing control valve. The base of a locking pin having a locking claw at the tip that engages with the engagement groove is pinned to the tube body in which the valve is installed through a through hole drilled in the wall of the tube body. A retraction prevention lock that can be reset from the outside by holding a biasing ring spring around the lock pin is provided, and when the water in the bathtub reaches a predetermined temperature, the shape memory effect of the biasing spring that has transferred heat is used. The cylinder opening/closing control valve operates to automatically shut off the gas pipe.

"Example" Hereinafter, this will be described in detail based on an example diagram in which a bathtub is installed.

1 and 2 are longitudinal sectional views of the proposed mechanism in non-blocking and blocked states, and FIG. 3 is an explanatory diagram of an example of the mounting of the proposed mechanism.

In Figures 1 and 2, 1 is a three-way pipe body, and the two sides 1a and 1b are those inserted in the middle of the gas pipe 2, such as hoses, as shown in Figure 3. It is.

The other end 1c is connected to the bathtub water 3 via a stopper lid 4.

As will be described later, the faucet lid 4 must be used to transmit the temperature of the bath water 3, so it is made of a material with good heat conductivity.

A cylinder opening/closing control valve 5 made of stainless steel or the like is installed in the branch pipe 1c and acts toward the three-way intersection.

In the illustrated example, a stepped valve seat 6 is formed on the branch pipe 1a, and a rubber gasket 5 attached to the tip of the valve 5 is attached to the stepped valve seat 6.
It is assumed that a is in contact.

A tension spring 7 made of stainless steel or the like is installed between the base of the valve 5 and the lid 4 for biasing the valve backward, and a push spring 8 for biasing the valve forward is interposed.

The push spring 8 is made of a shape memory alloy that has a shape memory effect set at a predetermined temperature, that is, the temperature during an abnormal state of dry cooking (for example, about 70° C.).

Therefore, the push spring 8 adjusts the temperature of the bathtub water 3 to the stopper lid 4.
As shown in FIG. 2, the shape memory effect is applied against the tension spring 7, and the valve 5 is moved forward by the force spring effect.

Note that when the temperature is below the set temperature shown in FIG. 1, the compression spring 8 is in a state of deformation strain that far exceeds its yield point, and cannot resist the tension spring 7 at all.

Therefore, when the temperature drops after the first closing valve operation, the valve 5 automatically returns to its original position, but this is dangerous as it may cause gas leakage.

Therefore, in order to prevent such return, it is necessary to provide a lock mechanism for preventing the valve 5 from retreating.

Furthermore, the locking mechanism must be releasable and resettable after a predetermined operation of the gas main valve.

In the illustrated example, such a locking mechanism is connected to the valve 5.
An engaging groove 9 is carved in the peripheral wall of the branch pipe 1c, and a lock pin 11 having a locking claw 11a at the tip that engages with the engaging groove 9 is pinned to the branch pipe 1c through a through hole 10, and further, This is done by using a ring spring 13 for engagement biasing held on the lock pin 11.

In the illustrated lock mechanism, the lock pin 1
When the bent upright piece 11b at the base of the valve 1 is pushed down against the ring spring, the lock is released and the valve 5 is reset.

FIG. 3 shows how the proposed mechanism is installed.

That is, in the illustrated example, the side wall 14a of the bathtub 14 is perforated to connect the branch pipe 1c. In terms of detecting the temperature of the bath water, the upper and lower conduit pipes 16a,
16b may be connected to the lower conduit 16b that flows into the bath pot 15 for heating.

"Effects of the Invention" As described above, according to the proposed mechanism, when the temperature of the water in the bathtub reaches a dangerous level, the gas can be automatically turned off reliably and empty cooking can be prevented, which is extremely suitable in practice.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views of the proposed mechanism in non-blocking and blocked states, and FIG. 3 is an explanatory diagram of an example of the mounting of the proposed mechanism. 1... Three-way pipe body, 2... Gas pipe line, 3... Bathtub water, 4... Tap lid, 5... Cylinder opening/closing control valve,
6...Valve seat, 7...Tension spring, 8...Press spring, 9
...Engagement groove, 10...Through hole, 11...Lock pin, 12...Pin stop, 13...Ring spring, 1
4...bathtub, 15...bath pot, 16a...upper conduit, 16b...lower conduit.

Claims (1)

[Scope of utility model registration request] Two sides are inserted in the middle of the gas pipe, and the other side is connected to the water side of the bathtub via a stopper made of a material with good heat conductivity. A cylinder opening/closing control valve that acts toward the intersection is installed between the stopper lid and a tension spring for retracting bias, as well as a pressure spring made of a shape memory alloy that has a shape memory effect set at a predetermined temperature. and further carving an engagement groove in the peripheral wall of the cylinder opening/closing control valve,
A base portion of a locking pin having a locking claw at the tip that engages with the engagement groove is pinned to the tube body housing the valve through a through hole drilled in the wall of the tube body, and
An automatic gas flow path shutoff mechanism characterized in that it is equipped with an externally resettable lock for preventing backward movement, which is formed by holding an engagement biasing ring spring around the lock pin.