JPH018855Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an overheat prevention device for a liquid fuel combustor such as an oil stove.

<Prior art> Conventional kerosene heaters are not equipped with a device to prevent overheating or abnormal rise in room temperature due to the influence of wind, running out of kerosene, or when the combustion wick is short. This can lead to oxygen deficiency accidents, discomfort due to strange smells, dehydration symptoms in infants, and fires.

<Purpose> The present invention was developed in view of the above-mentioned drawbacks, and is capable of detecting overheating during combustion or abnormally high room temperature and operating an automatic fire extinguishing system to ensure safety. The purpose is to provide an overheating prevention device that can be switched out of operation.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. First, the first embodiment will be explained with reference to FIGS. 1, 2, 3, and 4. In this example, the core outer cylinder proximate position A (including the abutting position) is close to the core outer cylinder 1 that guides the rise and fall of the core. An operation shaft 2 for core dry firing that can be switched between the core and outer cylinder separation position B is supported by the front panel 3 (or combustion tank 4), and the operation shaft 2 has a temperature-sensitive shaft for operating an automatic fire extinguishing system. The deformable piece 5 is provided so as to deform into a fire-extinguishing shape when the core outer cylinder 1 is abnormally overheated.

The operating shaft 2 is fitted into the front panel 3 through a bearing sleeve 8 so as to be slidable back and forth, and together with the temperature-sensitive deformable piece 5, these are formed into a temperature-sensitive unit U. That is, the operation shaft 2 includes a shaft portion 2a, a knob 9 provided at the front end thereof, a spring seat portion 2b formed in the middle portion, a guide protrusion 10 formed in the middle thereof, and a knob 9 provided at the rear end. The heat transfer body 11 is made of a heat conductive material. The bearing tube 8 includes a cylindrical main body 8a, an inward rear flange 8b formed at the rear end thereof, and an outward front flange 8 formed at the front end.
c, and an L-shaped guide hole 12 formed in the middle part. Further, the temperature-sensitive deformable piece 5 includes a unidirectional shape memory alloy 6 and a bias spring 7 that memorize a curved shape exceeding a transformation point when abnormally overheated (approximately 120°C).
(plate springs) stuck together, and the rear end of this is fixed to the heat transfer body 11.

In the temperature sensing unit U, a holding spring 13 made of a compression coil spring is inserted into the bearing cylinder 8, the operating shaft 2 is penetrated into the bearing cylinder 8 and the spring 13 from the front side, and heat is transferred to the outside of the bearing cylinder 8. Temperature-sensitive deformable piece 5 on body 11
It is fixed by caulking etc. At this time,
The guide protrusion 10 is fitted into the guide hole 12, and the spring 13 urges the operating shaft 2, that is, the guide protrusion 10, toward the front. And the front flange 8 of the bearing tube 8
c is fixed to the inner surface of the window hole 3a of the front panel 3. Reference numeral 14 denotes a known anti-seismic automatic fire extinguishing device activation weight, and when this weight is overturned by the deformed temperature-sensitive deformable piece 5, the wick of the kerosene stove descends and the burner is automatically extinguished.

Next, the action will be explained. Oil stoves are 3rd and 4th
As shown in the figure, it is used with the heat transfer body 11 of the operation shaft 2 for core dry firing set at position A close to the core and outer cylinder. When the knob 9 is pressed and turned to the left, the guide protrusion 10 of the operating shaft 2 engages with the engaging portion 12a of the guide hole 12 and is elastically held in this state by the elasticity of the spring 13. In a normal state without abnormal overheating, the bias spring 7 of the temperature-sensitive deformable piece 5 has a stronger force than the shape memory alloy 6, so the temperature-sensitive deformable piece 5 maintains the straight shape shown in FIG. Do not touch. but,
When the kerosene stove is affected by wind, runs out of kerosene, or has a short combustion wick, the heat transfer body 11 and temperature-sensitive deformable piece 5 that are in contact with the wick outer cylinder 1 as shown in Fig. 4 will normally reach approximately 85 mm.
The temperature of something that is 120 degrees Celsius rises to about 120 degrees Celsius or more. When the kerosene stove is abnormally overheated, the shape memory alloy 6 exceeds its transformation point through the temperature-sensitive deformable piece 5 as shown in Figure 4, so it becomes a curved extinguishing shape against the bias spring 7, and the temperature-sensitive deformation occurs. Piece 5 overturns weight 14 and activates the automatic fire extinguishing device,
Automatically extinguishes the kerosene stove.

In addition, by slightly lowering the transformation point of the shape memory alloy 6, an automatic fire extinguishing device can be operated even when the room temperature is abnormally high, so that the kerosene stove can be automatically extinguished.

Next, when firing the core dry, turn the knob 9 to the right as shown in FIG.
When removed from 2a, the guide protrusion 10, that is, the operating shaft 2
is moved forward by the force of the spring 13, and the temperature-sensitive deformable piece 5
After switching the operating shaft 2 and the heat transfer body 11 to a position B where the core and outer cylinder 1 are not in contact with the core and outer cylinder 1, and setting the shape memory alloy 6, that is, the temperature-sensitive deformable piece 5 to a position where it does not react,
Perform core dry firing.

In addition, in the present invention, the temperature-sensitive deformable piece 5 is not limited to the configuration of the first embodiment, but has a curved shape when abnormally overheated above a certain temperature and a straight shape when normal (approximately 85° C.) below a certain temperature. It may be constructed from a bidirectional shape memory alloy that memorizes the shape.

In addition, in the present invention, as in the second embodiment shown in FIG.
One end of the temperature-sensitive deformable piece 5 made of a bidirectional shape memory alloy coil is fixed to a heat transfer body 11, and the other end is attached to a weight 1.
The weight 14 may also be made to face the weight 14 and take an extended extinguishing shape when overheated, and the weight 14 may be overturned.

<Effects> As is clear from the above explanation, the present invention is applicable to a liquid fuel combustor equipped with an automatic fire extinguishing system, in which the core and outer cylinders are located at a position close to the core and outer cylinder that guides the raising and lowering of the wick, and at a position where the outer cylinder is separated from the core and the outer cylinder. A switchable operation shaft for use during core dry firing is provided between the operation shaft, and a heat transfer body that is close to the core outer cylinder at a position close to the core outer cylinder, and a heat transfer member that is connected to the heat transfer body at a position close to the core outer cylinder. A temperature-sensitive deformable piece is fixed to the core outer cylinder and deforms into a fire extinguishing shape when the outer core cylinder overheats, and the temperature-sensitive deformable piece deforms the automatic fire extinguishing device into an extinguishing shape at a position close to the core outer cylinder of the operating shaft. It is placed in the position where it is activated.

Therefore, according to the present invention, an automatic fire extinguishing system is activated by detecting the influence of wind, kerosene outage, overheating when the wick is short, or abnormally high temperature indoors, and when the wick is dry, the operating shaft can be easily switched. This has the advantage of being able to switch the automatic fire extinguishing system so that it does not operate.

[Brief explanation of drawings]

The drawings show an embodiment of the overheating prevention device of the present invention. Fig. 1 is an exploded perspective view of the temperature sensing unit of the first embodiment, Fig. 2 is a perspective view when the core is dry-fired, and Fig. 3 is a normal state. Figure 4 is a perspective view of the same during abnormal overheating.
FIG. 5 is a perspective view of the second embodiment of the present invention in a normal state. A: Core and outer cylinder close position, B: Core and outer cylinder separated position,
1: Core outer cylinder, 2: Operation axis, 3: Front panel, 4:
Combustion tank, 5: Temperature-sensitive deformable piece, 6: Shape memory alloy, 7: Bias spring.

Claims (1)

[Scope of utility model registration request] In a liquid fuel combustor equipped with an automatic fire extinguishing device, there is provided an operating shaft for dry-firing the core that can be switched between a position close to the core outer cylinder and a position separated from the core outer cylinder, which guides the raising and lowering of the wick. A heat transfer body is provided on the operation shaft and is close to the core and outer cylinder at a position close to the core and outer cylinder, and is thermally fixed to the heat transfer body and deforms into an extinguishing shape when the core and outer cylinder is abnormally overheated. A temperature-sensitive deformable piece is provided, and the temperature-sensitive deformable piece is disposed at a position to actuate the automatic fire extinguishing device in a fire extinguishing shape at a position close to the core outer cylinder of the operating shaft. Overheat prevention device for the vessel.