JPH0431444Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application and overview of the invention] This invention temporarily reduces the combustion amount of the burner to a low heat state when cooking, such as rice cooking, is nearing the end.
This relates to a combustion control system for a two-stage extinguishing type gas appliance that subsequently extinguishes the appliance.The number of components of this type of combustion control system, which achieves two-stage extinguishing using two sets of independent heat-sensitive components, is By reducing the number, the structure of the combustion control device is simplified.

[Prior art and its problems] As a combustion control device for this type of gas appliance, there is, for example, a combustion control device for a rice cooker described in Japanese Utility Model Application Publication No. 57-140221.

This has a structure as shown in Figs. 3 and 4, and two soft ferrites 3 and 4 with different set temperatures are attached to the top surface of the cylinder 2 that contacts the outer bottom surface of the rice cooker 1. , these soft ferrites 3, 4
, the first and second permanent magnets 31 and 41 are attracted to each other, and these two permanent magnets are attached to the upper ends of the two lifting shafts 30 and 40, respectively. In the following, the soft ferrite 3 with a lower set temperature will be referred to as a low temperature soft ferrite, and the other one will be referred to as a high temperature soft ferrite 4.

One end of an operating lever 32, 42 is connected to the lower end of each of the lifting shafts 30, 40, respectively, and the vicinity of the other end of these operating levers 32, 42 is connected to a common support shaft 9.
It is rotatably supported by 3.

In addition, the tip portions of valve shafts 37, 47 (valve shafts for gas valves) that correspond to these and move forward and backward are in contact with the swinging portions of each of the operating levers 32, 42, respectively. A regulating gas valve 39 corresponding to the first valve shaft 37 is inserted in a gas circuit configured as shown in FIG. 5 in parallel connection with an orifice 96. Further, the main valve 49 corresponding to the other second valve shaft 47 is connected to the adjusting gas valve 39 and the orifice 96.
is inserted into the upstream circuit of When the valve shafts 37 and 47 are pushed in together to open both the main valve 49 and the regulating gas valve 39, the firepower is high, but when only one valve shaft 47 is pushed in, only the main valve 49 is opened. In each state, each burns with a small firepower.

Now, when cooking rice, push down the operating parts 38, 48 of each operating lever and press down each operating lever 32,
The valve shafts 37, 47 that come into contact with the swinging portion of 42 are pushed together to cause the burner 6 to burn at a high power state.
Further, when the operating parts 38, 48 are pushed down to swing the first and second operating levers 32, 42, the corresponding first and second elevating shafts 30, 40 are moved upwardly, and the first and second operating levers 32, 42 are moved upwardly. The two permanent magnets 31 and 41 are lifted up, thereby causing the first and second permanent magnets 3
1 and 41 are adsorbed to the corresponding soft ferrites 3 and 4, respectively.

When rice cooking approaches completion in this state and the internal temperature of the rice cooking pot 1 rises, the low-temperature soft ferrite 3 with the lower set temperature first transforms and the first permanent magnet 31 no longer attracts it. Then, the first lifting shaft 30 and the first operating lever 3 connected to the first permanent magnet 31
2 descends and returns to its initial state, and the corresponding first valve shaft 37 also returns to its initial state (valve closed state). That is, the regulating valve 39 is closed and the gas burner 6 burns with low thermal power.

Next, when the internal temperature of the rice cooker 1 further rises and the rice cooking is completed, the high temperature soft ferrite 4 transforms and the other second valve shaft 47 is in the initial state (valve closed state) as in the case of the low temperature soft ferrite 3. ). That is, the main valve 49 is closed and the gas burner 6 is completely extinguished.

However, the conventional combustion control device described above has a problem in that its structure is complicated.

In the case of the above-mentioned conventional one, this means that the elevating shaft 30,
This is because the magnets 40 must be provided in correspondence with the first and second permanent magnets 31 and 41, respectively.

That is, in the case of the above-mentioned conventional device, since the lifting shafts 30, 40 corresponding to the first and second permanent magnets 31, 41 are provided for each magnet, the operating levers etc. for operating these are attached to the respective lifting shafts 30, 40. Not only are two lifting shafts 30 each required, but also two lifting shafts 30,
Two gas valves 39, 49, etc., which are opened and closed at 40, are inevitably required, and the increase in the number of these parts complicates the structure of the combustion control device.

[Technical Issues] The present invention is based on ``a soft ferrite 3 with a low set temperature that is installed to detect the temperature of the heated part.
and a soft ferrite 4 with a high set temperature, and first and second permanent magnets 31 each attracted to these separately.
41 is provided, and the first and second
In a combustion control device for a gas appliance, the permanent magnets 31 and 41 are separated separately, and a fire extinguishing mechanism interlocked with the first and second permanent magnets 31 and 41 performs two-stage fire extinguishing. In order to simplify the structure, the objective is to reduce the number of component parts such as the lifting shaft.

[Technical Means] The technical means of the present invention taken to solve the above problems are as follows: ``The lifting shaft 7 for supporting the first permanent magnet 31 attracted to the soft ferrite 3 has a
A support arm 44 for supporting the other second permanent magnet 41 is attached so as to be able to slide up and down by a certain distance, and the support arm 44 in the sliding area
At the upper end position, the second permanent magnet 41 is located above the first permanent magnet 31, and a spring 34 is provided between the support arm 44 and the lifting shaft 7 to bias the support arm 44 in the upward direction. , and the fire extinguishing mechanism is operated according to the amount of descent of the elevating shaft 7.

[Operation] The above technical means of the present invention operates as follows.

First, when starting work, the lifting shaft 7 is pushed up in the same way as in the conventional system described above.

When the lifting shaft 7 is pushed up, the support arm 44 can move vertically by a certain distance relative to the lifting shaft 7, but a spring 34 is interposed between the supporting arm 44 and the lifting shaft 7. Support arm 44 for lifting shaft 7
is urged upward, so that the first permanent magnet 31 and the second permanent magnet 41 are lifted up integrally while being located at the upper end of the constant relative movement range.
At this time, the second permanent magnet 41 is connected to the first permanent magnet 31.
Since the second permanent magnet 41 is located above the soft ferrite 4, first, the second permanent magnet 41 is attracted and held by the soft ferrite 4.
Further, when the lifting shaft 7 rises, the supporting arm 44 and the lifting shaft 7 can move vertically relative to each other.
4, the lifting shaft 7 rises independently against the urging force of the spring 34, and finally the first permanent magnet 31 is attracted to the soft ferrite 3.

As a result, the first permanent magnet 31 and the second permanent magnet 41 are both attracted and held by the corresponding soft ferrite, and in this state, the heated portion is heated and heated.

Now, when the heating work progresses and the heated part is raised to the operating temperature of the first stage, first, the soft ferrite 3 transforms and the first permanent magnet 31 no longer attracts it, and the lifting shaft 7 moves downward. .

In this state, the soft ferrite 4 has not yet transformed and continues to attract and hold the second permanent magnet 41. On the other hand, since the relative movement amount between the lifting shaft 7 and the support arm 44 is set to a certain distance, the lifting shaft 7 moves downward by this fixed distance, and further downward movement is prevented. . In other words, the elevating shaft 7 does not descend to the initial position, but stops at an intermediate position.

Then, the fire extinguishing mechanism performs the first stage operation by the above-described operation of the elevating shaft 7.

After that, when the heating work further progresses and the heating is completed, the temperature of the heated part becomes soft ferrite 4.
reaches the set temperature, the soft ferrite 4 undergoes transformation and is released from adsorption with the second permanent magnet 41, and the lifting shaft 7
is lowered together with the support arm 44. The fire extinguishing mechanism performs the second stage operation by the downward movement of the lifting shaft 7 at this time.

As mentioned above, according to the technical means of the present invention,
There is no need to prepare two sets of the soft ferrite 4 and the operation levers connected thereto as in the conventional system described above.

[effect] The present invention has the following unique effects.

The structure of the combustion control device can be simplified because the number of components such as the lifting shaft and the operating lever connected thereto can be reduced.

[Example] Next, an example of the present invention described above will be described in detail with reference to the drawings.

What is shown in FIG. 1 and FIG. 2 illustrates the case where the present invention is implemented in a gas rice cooker.

As shown in FIG. 1, a low-temperature soft ferrite 3 is disposed at the center of the top surface of the cylindrical body 2 that comes into contact with the bottom surface of the rice cooker 1, and both sides of the low-temperature soft ferrite 3 A pair of high temperature soft ferrites 4, 4 are arranged.

A corresponding first permanent magnet 31 is provided below the low-temperature soft ferrite 3,
The first permanent magnet 31 is housed in a holder 36 attached to the tip of the lifting shaft 7. Further, a flange 35 is provided in the middle of the lifting shaft 7.

A support arm 44 that supports the second permanent magnets 41, 41 is attached above the flange 35 of the lift shaft 7, and a transparent transparent material that is one size larger than the diameter of the lift shaft 7 is provided in the center of the support arm 44. A hole 45 is bored. By fitting the through hole 45 onto the lift shaft 7, the support arm 44 and the lift shaft 7 are combined so as to be able to slide relative to each other.

In addition, the support arm 44 and the flange 35 of the lifting shaft 7
A spring 34 is interposed between them, and the support arm 44 is biased upward by the spring 34.

Therefore, when the first and second permanent magnets 31 and 41 are not attracted to the corresponding soft ferrite, the second permanent magnet 41 is attached to the first permanent magnet 31.
It will be located higher up.

Incidentally, in FIG. 1, reference numerals 80, 80 are guide shafts loosely inserted into through holes 46, 46 bored at both ends of the support arm 44, to allow the support arm 44 to move up and down smoothly. It was established for this purpose.

Next, an operating lever 72 for opening and closing the valve device 5 is connected to the lower end of the lifting shaft 7, and the relationship between the operating lever 72 and the valve device 5 is configured as shown in FIG.

That is, a slide valve 51 having a through hole 50 formed in the radial direction is installed in the housing 52 of the valve device 5, and the valve shaft 55 of the slide valve 51 is
It protrudes outward from the housing 52 and is biased in the protruding direction by a spring 56 so that its tip comes into contact with the operating lever 72 . Further, a gas passage hole 54 is provided through the housing 52,
The slide valve 51 is housed so as to cross the gas passage hole 54 .

Finally, a pipe connected to the gas burner 6 is drawn out from the downstream side gas outlet 57 of the valve device 5.

Now, at the start of rice cooking, as shown in FIG. As shown in FIG. 2, the slide valve 51 in the valve device 5 is also pushed to its deepest position by the operating lever 72, so that the gas circuit is fully open.

Next, when the rice cooking is nearing completion and the temperature inside the rice cooker 1 starts to rise, first, the low temperature soft ferrite 3
was transformed and the first permanent magnet 31 was attracted to it.
is separated from the low-temperature soft ferrite 3.

When the first permanent magnet 31 separates from the low-temperature soft ferrite 3, the lifting shaft 7 to which the first permanent magnet 31 is attached begins to descend, and the first permanent magnet 31
The bottom surface of the holder 36 that accommodates the support arm 44 contacts the support arm 44. That is, the first stage of descent is performed.

When the elevating shaft 7 performs the first stage of descent, the operating lever 72 connected to the lower end of the elevating shaft 7 also swings.
The slide valve 51, which is brought into contact with the operating lever 72, also protrudes and moves by a certain stroke. As a result, the gas passage hole 54 of the housing 52 and the through hole 50 of the slide valve 51 are brought into a state where only half of them coincide (as indicated by the dashed line in FIG. 2), and the amount of gas supplied to the gas burner 6 is throttled. That is, the gas burner 6 burns with low thermal power.

Next, when the temperature inside the rice cooking pot 1 further rises and reaches the rice cooking completion state, the high temperature soft ferrites 4, 4 and the corresponding second permanent magnets 41, 41 are also separated.
As shown by the one-dot chain line in FIG. 1, the lifting shaft 7 descends to the lowest position together with the support arm 44, and as shown by the two-dot chain line in FIG.
4 and the through hole 50 of the slide valve 51 are completely misaligned. As a result, the gas burner 6 is completely extinguished, and rice cooking is completed.

In the above-mentioned embodiment, the combustion amount of the gas burner 6 is controlled by the amount of movement of one slide valve 51 incorporated in the housing 52, but the gas circuit is configured as shown in FIG. 5, and the regulating valve 3 is configured as shown in FIG.
The first valve shaft 37 corresponding to the valve 9 and the second valve shaft 47 corresponding to the main valve 49 may be made to protrude from the housing separately, and these may be pushed in with a single operating lever 72. In such a case, the first valve shaft 47 corresponding to the regulating valve 39 is connected to the second valve shaft 47 corresponding to the main valve 49.
It is necessary to prevent the regulating valve 47 from opening unless the valve shaft 37 is pushed deeply, and to change the opening timings of the main valve 49 and the regulating valve 39.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of the embodiment of the present invention, FIG. 2 is an enlarged view of the valve device 5 and the operating lever 72, and FIG.
Fig. 4 is an explanatory diagram of a conventional example, and Fig. 5 is a gas circuit diagram. Permanent magnet, 41...Second permanent magnet.

Claims (1)

[Scope of utility model registration request] A soft ferrite 3 with a low set temperature and a soft ferrite 4 with a high set temperature are installed to detect the temperature of the heated part, and first and second permanent magnets 31 and 41 are respectively attracted to these, and The first and second permanent magnets 31 and 41 are separated from each other due to changes in the magnetic permeability of the soft ferrites 3 and 4 due to changes in the temperature of the heated part, and are interlocked with these first and second permanent magnets 31 and 41. In a combustion control device for a gas appliance that performs two-stage fire extinguishing using a fire extinguishing mechanism, the first
The lifting shaft 7 for supporting the permanent magnet 31 has a support arm 4 for supporting the other second permanent magnet 41.
4 is attached so that it can freely slide up and down by a certain distance, and at the upper end position of the support arm 44 in the sliding area, the second permanent magnet 41 is attached to the first permanent magnet 3.
1, and the support arm 4
A spring 34 for biasing the support arm 44 in the upward direction is interposed between the lifting shaft 7 and the lifting shaft 7.
A combustion control device for a two-stage extinguishing type gas appliance that operates a fire extinguishing mechanism according to the amount of fall of the flame.