JPH11270855A - Tempura oil overheating prevention sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily process parts, to reduce the fluctuation of assembly machining accuracy and the costs of product, and to stabilize characteristics. SOLUTION: A sensor has a metal case 1 and a metal cap covering the case 1. At the same time, the case 1 is provided with bimetal being arranged inside the cap, a switch mechanism being driven by the inverse operation of the bimetal, and a ceramic case 16 that supports the bimetal and at the same time has the switch mechanism. In this case, a vertical groove 21 is provided along the longitudinal direction of the sensor, a tongue piece 20 that can be engaged to the vertical groove 21 is provided in the case 1, and the vertical groove 21 is engaged to the tongue piece 20 for preventing the metal case 1 and the ceramic case 16 from being rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for various gas appliances such as a cooking gas table, and in particular, when cooking a tempura or the like using a gas appliance, overheating of the tempura oil. The present invention relates to a tempura oil overheat prevention sensor capable of preventing the occurrence of heat.

[0002]

2. Description of the Related Art A conventional example will be described below. §1: Description of Conventional Example 1—See FIG. 3 FIG. 3 is an explanatory diagram of Conventional Example 1. 3A is a cross-sectional view of the sensor, FIG. B is a cross-sectional view taken along the line XY of FIG. A, and FIG.
FIG. 3D is a partially enlarged view of the case shown in FIG. Hereinafter, Conventional Example 1 will be described with reference to FIG.

[0003] Conventional Example 1 is an example of a thermistor-type tempura oil overheating prevention sensor (hereinafter, also simply referred to as "sensor").
A metal case 1 and a metal cap 3 placed on the case 1 are provided. In the case 1, a thermistor 5 disposed inside the cap 3, a spring 4, and a spring receiving portion 8 at one end are provided. A metal shaft 2 is provided. A step 6 is provided on the lower side of the case 1 (the lower side in use), and a spring receiving section 8 provided on the shaft 2 is locked inside the step 6. The lead wire 7 drawn out from the thermistor 5 is drawn out through the shaft 2.

The sensor is a thermistor 5 as a heat-sensitive element.
The thermistor 5 is disposed so as to be in contact with the inside of the cap 3. And this sensor is
For example, it is used by being attached to the approximate center of a gas stove,
The cap 3 is used so that the bottom of a cooking utensil (for example, a pan) placed on a gas stove contacts the bottom.

[0005] By the way, it is assumed that a sensor attached to the central portion of the gas stove receives an impact from cooking utensils during cooking. In this case, a rotational force may be applied to the sensor body due to the impact. in this way,
When a rotational force is applied to the sensor main body, the lead wire 7 drawn from the thermistor 5 may be twisted, and may eventually break. Therefore, the sensor has an anti-rotation structure. This anti-rotation structure is configured as follows.

That is, in order to prevent rotation of the cap 3 and the case 1, the case 1 is provided with a plurality of locking holes 9 (three in this example), and the cap 3 is provided with the locking holes 9.
The locking projections 10 are provided at a plurality of positions at positions where the locking projections 10 can be engaged.
Then, the case 1 and the cap 3 are prevented from rotating by engaging the engaging projection 10 provided on the cap 3 with the engaging hole 9 provided on the case 1.

In order to prevent the case 1 and the shaft 2 from rotating, a convex portion (inwardly convex) 11 is provided on the case 1 and a spring receiving portion 8 of the shaft 2 is provided at a position where the convex portion 11 can be engaged. Is provided with a concave portion 12. And Case 1
And a concave portion 12 provided on the shaft 2.
, The rotation of the case 1 and the shaft 2 is prevented.

§2: Description of Conventional Example 2—See FIG. 4 FIG. 4 is an explanatory diagram of Conventional Example 2. 4A is an exploded perspective view of the sensor, and FIG. 4B is a partial sectional view. Hereinafter, Conventional Example 2 will be described with reference to FIG. This example is an example of a bimetal-type tempura oil overheat prevention sensor.
Is used.

The bimetal-type tempura oil overheat prevention sensor (hereinafter, also simply referred to as a “sensor”) of Conventional Example 2 includes a metal case 1, a metal shaft 2 having a spring receiving portion 8 at one end, and a metal Cap 3 and spring 4
, A bimetal 15, a ceramic case 16 made of ceramic, and a switch mechanism including a reed switch and a magnet driven by the inversion operation of the bimetal 15.

Then, the shaft 2 is incorporated in the case 1 and the spring receiving portion 8 of the shaft 2 is locked inside the step 6 provided on the lower side of the case 1 (the lower side in use). I have. The spring 4 is mounted on the spring receiving portion 8 of the shaft 2, and the ceramic case 16 is mounted thereon.

Further, a bimetal 15 is placed on a ceramic case 16, and a cap 3 is put on the bimetal 15, and the cap 3 and the case 1 are fixed. In this case, the ceramic case 16 supports the bimetal 15 on the upper side (upper side in use), and a switch mechanism is attached below the bimetal (lower side in use).

The tempura oil overheating prevention sensor is attached to the center of the gas stove, and is used in the same manner as in the prior art example 1. However, it is assumed that a cooking utensil or the like receives an impact during cooking. In this case, a rotational force may be applied to the sensor main body due to the impact, and a lead wire drawn from a switch mechanism mounted inside the sensor may be twisted and eventually broken. Therefore, the sensor has an anti-rotation structure. This anti-rotation structure is as follows.

That is, the case 1 and the ceramic case 1
In order to prevent rotation with respect to the case 6, a rotation preventing groove 17 is provided at the bottom of the ceramic case 16, and the case 1 is located at a position corresponding to the rotation preventing groove 17 and located above the case 1 (in use. The protrusion 18 is provided inside the step 13 provided on the upper side).
Is provided. Then, by engaging the protrusion 18 of the case 1 with the rotation preventing groove 17 of the ceramic case 16,
The rotation of the case 1 and the ceramic case 16 is prevented. The rotation preventing mechanism for preventing the rotation of the case 1 and the shaft 2 is the same as that of the first conventional example.

[0014]

The above-mentioned prior art has the following problems. (1): The sensors of Conventional Examples 1 and 2 are used by being attached to the central part of a gas stove, but it is assumed that a shock is caused by cooking utensils or the like during cooking. In this case, a rotational force may be applied to the sensor body due to the impact.
As described above, when a rotational force is applied to the sensor main body, the lead wire drawn from the thermosensitive element or the switch mechanism may be twisted, and may eventually be broken. Therefore, the sensor has an anti-rotation structure.

In particular, in the bimetal-type tempura oil overheat prevention sensor as in Conventional Example 2, a rotation prevention mechanism is also provided between a metal case and a ceramic case. When assembling such a bimetallic tempura oil overheat prevention sensor, after assembling the metal case and the shaft, insert the spring, then assemble the ceramic case,
Even if the ceramic case is positioned and inserted, the spring will lift the ceramic case,
Before the cap is assembled, the engagement portion for preventing rotation may come off.

Therefore, the assembly is performed in a state where the position of the ceramic case is unstable, and the assembly is difficult. In addition, variations in assembly accuracy occur, and the characteristics of the sensor are not stable.

(2) As described above, before assembling the bimetal and the cap, the height of the rotation preventing groove of the ceramic case is increased to reduce the possibility that the engaging portion is disengaged, and the ceramic case is floated by the spring. It was conceived to prevent the engagement part from coming off even in the state in which it was placed. However, in this case, post-processing such as milling is required to form the rotation preventing groove, which causes an increase in cost.

The present invention has been made to solve the above-mentioned conventional problems, and has a reliable mechanism for preventing rotation of a metal case and a ceramic case, thereby improving the simplification and ease of processing of parts and assembling. The objective is to reduce the variation in processing accuracy, reduce the cost of the product and stabilize the characteristics, and to reliably prevent the lead wire drawn from the switch mechanism attached to the ceramic case from being twisted and disconnected. And

[0019]

Means for Solving the Problems The present invention has the following constitution in order to achieve the above object. (1): A metal case, a metal cap covering the case, a bimetal disposed inside the cap inside the case, and a switch mechanism driven by an inversion operation of the bimetal. And a tempura oil overheat prevention sensor having a ceramic case to which the bimetal is supported and to which the switch mechanism is attached, wherein a vertical groove is provided in the outer peripheral portion of the ceramic case along a longitudinal direction of the sensor. By providing an engaging portion including a tongue piece or a convex portion that can be engaged with the vertical groove, and by engaging the vertical groove with the engaging portion, rotation of the metal case and the ceramic case is prevented. did.

(2) A metal case and a metal cap covering the case are provided. The case is driven by a bimetal disposed inside the cap and an inversion operation of the bimetal. A tempura oil overheating prevention sensor having a switch mechanism and a ceramic case supporting the bimetal and having the switch mechanism mounted thereon, the ceramic case having a stepped portion at an outer peripheral portion, and at least one of the stepped portions. A protruding portion protruding in a direction opposite to the bimetal, a notch portion engageable with the protruding portion is provided at an open end of the metal case, and the protruding portion and the notch are provided. The rotation of the metal case and the ceramic case was prevented by engaging the parts.

(Operation) The operation of the present invention based on the above configuration will be described. (a): Action of the above (1) When assembling the sensor, a shaft having a spring receiving portion is incorporated in a metal case, a spring is mounted on the spring receiving portion, and a ceramic case is mounted thereon. Further, a bimetal is placed on the ceramic case, a cap is placed on the bimetal, and the cap and the metal case are fixed. At this time, alignment is performed such that an engaging portion including a tongue piece or a convex portion provided on the metal case is engaged with a vertical groove provided on the ceramic case.
Thus, the rotation of the ceramic case and the metal case is prevented.

However, when the ceramic case is placed on the spring during the assembly, the ceramic case is pushed up from the metal case to the outside by the spring installed in advance.
That is, when the ceramic case is incorporated in a metal case, the ceramic case is floated by the spring.

As described above, even when the ceramic case is in a floating state, the vertical groove and the tongue piece or the convex portion are maintained so that the engaging portion including the tongue piece or the convex portion and the vertical groove of the ceramic case can maintain the engaged state with each other. Determine the shape and dimensions of the part. With this configuration, even when the ceramic case is floating, the vertical groove and the tongue piece or the convex portion are securely engaged, and the rotation preventing mechanism between the metal case and the ceramic case is assured. .

As described above, before the cap is put on the metal case, the ceramic case can be reliably prevented from rotating with respect to the metal case, so that there is no displacement between the metal case and the ceramic case. . For this reason,
It is possible to eliminate assembly defects. Also, if the engagement state between the tongue piece or the convex portion and the vertical groove is checked during the assembly, the correctness of the position of the component can be determined on the external appearance, so that the work can be stabilized. Further, it is not necessary to form a groove on the bottom of the ceramic case as in the conventional example, and the cost of the product can be reduced.

That is, the rotation preventing mechanism between the metal case and the ceramic case is made reliable, thereby simplifying and facilitating the processing of parts, reducing variations in assembly processing accuracy, reducing product cost, In addition, the characteristics can be stabilized. Further, it is possible to reliably prevent the lead wire drawn from the switch mechanism attached to the ceramic case from being twisted and disconnected.

(B): Operation of the above (2) When assembling the sensor, the positioning is performed so that the notch provided at the opening end of the metal case and the protrusion provided at the ceramic case are engaged. Going and incorporating the ceramic case into the metal case. Thus, the rotation of the ceramic case and the metal case is prevented. During such assembling, when the ceramic case is placed on the spring as described above, the ceramic case is floated by the spring.

As described above, the dimensions of the projection and the notch are determined so that the engagement between the projection and the notch can be maintained even when the ceramic case is floating. With this configuration, even when the ceramic case is in a floating state, the protrusion and the notch are securely engaged. Therefore, the rotation preventing mechanism between the metal case and the ceramic case is assured.

As described above, before the metal case is covered with the cap, the ceramic case can be reliably prevented from rotating with respect to the metal case, so that the metal case and the ceramic case do not shift. . For this reason,
It is possible to eliminate assembly defects. In addition, if the engagement state between the protruding portion and the notch portion is checked during assembly, the correctness of the position of the component can be determined on the external appearance, so that the work can be stabilized. Further, it is not necessary to form a groove on the bottom of the ceramic case as in the conventional example, and the cost of the product can be reduced.

That is, the mechanism for preventing the rotation of the metal case and the ceramic case is ensured, thereby simplifying and facilitating the processing of the parts, reducing the variation in the accuracy of the assembly processing, reducing the cost of the product, In addition, the characteristics can be stabilized. Further, it is possible to reliably prevent the lead wire drawn from the switch mechanism attached to the ceramic case from being twisted and disconnected.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram (part 1) of a tempura oil overheat prevention sensor, and FIG. 2 is an explanatory diagram (part 2) of a tempura oil overheat prevention sensor. Hereinafter, based on FIGS. 1 and 2,
An embodiment of the present invention will be described in detail. The embodiment described below is an example in which the present invention is applied to a bimetallic tempura oil overheat prevention sensor having the configuration described in the second conventional example. Therefore, what is not shown in FIGS. 1 and 2 is the same as the conventional example 2 shown in FIG.

§1: Description of Example 1—See FIG. 1 In FIG. 1, A is an explanatory view of Example 1, B is a sectional view taken along line MN shown in A, and C is a case engagement. It is a perspective view at the time. Hereinafter, Example 1 will be described.

(1) Description of the whole tempura oil overheat prevention sensor The tempura oil overheat prevention sensor of Example 1 (hereinafter simply referred to as “sensor”)
Similarly, in the same manner as in the conventional example 2, the case 1, the shaft 2, the cap, the spring 4, the bimetal,
It is composed of a ceramic case 16 and components such as a switch mechanism including a reed switch and a magnet driven by the inversion operation of the bimetal.

In this case, the case 1, the shaft 2 and the cap are made of a metal case such as stainless steel. The ceramic case 16 supports the bimetal and is used as a member for attaching the switch mechanism. Further, the spring 4 pushes the ceramic case 16 toward the cap in a state where the ceramic case 16 is incorporated in the case 1.

The shaft 2 is incorporated in the case 1, and the spring receiving portion 8 of the shaft 2 is locked inside the step 6 formed on the lower side of the case 1. The spring 4 is mounted on the spring receiving portion 8 of the shaft 2, and the ceramic case 16 is mounted thereon.

Further, a bimetal is placed on the ceramic case 16, and a cap is placed on the bimetal, and the cap and the case 1 are fixed. In this case, the ceramic case 16 supports the bimetal 15 on the upper side (upper side in use), and holds the switch mechanism toward the lower side (lower side in use). Note that the use state of the sensor and the like are the same as in the above-described conventional example 2, and the description is omitted.

(2): Description of rotation prevention mechanism In the above-mentioned tempura oil overheating prevention sensor, the rotation prevention mechanism of the metal case 1 and the ceramic case 16 is as follows. That is, in order to prevent rotation of the case 1 and the ceramic case 16, the same dimension (length) as the height of the ceramic case 16 is provided along the longitudinal direction of the sensor (the direction of arrow ST in the drawing) on the outer peripheral portion of the ceramic case 16. Is the same)
The case 1 is provided with a tongue piece 20 that can be engaged with the vertical groove 21 at the open end of the case 1, and the vertical groove 21 and the tongue piece 20 are engaged with each other. The case 1 and the ceramic case 16 are prevented from rotating.

At the time of assembling the sensor, the shaft 2 is assembled into the case 1 and the spring receiving portion 8 of the shaft 2 is engaged inside the step 6 formed on the lower side of the case 1 (the lower side in use). To stop. Thereafter, the spring 4 is placed on the spring receiving portion 8, and the ceramic case 16 is placed thereon.

Further, the bimetal 15 is placed on the ceramic case 16, the cap 3 is put on the bimetal 15, and the cap 3 and the case 1 are fixed. At this time, the tongue piece 20 provided on the case 1 is aligned and assembled so as to engage with the vertical groove 21 provided on the ceramic case 16. Thus, the rotation of the ceramic case 16 and the case 1 can be prevented.

When the ceramic case 16 is placed on the spring 4 during the assembling, the ceramic case 16 is pushed up from the case 1 to the outside (the direction of the arrow S in the drawing) by the spring 4 incorporated in advance (FIG. 1B). That is, when the ceramic case 16 is incorporated into the case 1, the ceramic case 16 is floated by the spring 4.

The shape and size of the vertical groove 21 and the tongue piece 20 so that the tongue piece 20 and the vertical groove 21 of the case 1 can maintain the engagement state with each other even when the ceramic case 16 is floating. Is decided. In this way, even when the ceramic case 16 is floating, the vertical groove 21 and the tongue piece 20 are securely engaged with the engagement width W (see FIG. 1C).

In this manner, the case 1 and the ceramic case 16 are reliably prevented from rotating. . Accordingly, in a state where the rotation of the ceramic case 16 is prevented, the bimetal is placed on the ceramic case 16 and the sensor is assembled by placing a cap on the bimetal. At this time, the rotation of the ceramic case 16 is prevented. Since the positioning is performed reliably, the assembling work of the parts becomes easy and simple.

§2: Description of Example 2—See FIGS. 1D and 1E In FIG. 1, FIG. 1D is an explanatory view of Example 2 and FIG. Hereinafter, Example 2 will be described with reference to FIGS. Example 2 is a modification of Example 1 and is effective when the spring pressure of the spring 4 is large and the minimum necessary engagement width W between the tongue piece 20 and the longitudinal groove 21 in Example 1 cannot be obtained. It is.

In the second embodiment, instead of the tongue piece 20 of the first embodiment, a convex portion 22 is formed inside the case 1 near the opening end. At least one of the protrusions 22 is formed at a position inside the vicinity of the opening end of the case 1 and at a position where the protrusion 22 can be engaged with the vertical groove 21 so as to protrude into the case 1. The vertical groove 21 has the same configuration as that of the first embodiment.

When assembling the sensor, as in Example 1, the shaft is assembled in the case 1, the spring 4 is mounted thereon, and the ceramic case 16 is further mounted thereon. 1
6 is in a floating state. However, the ceramic case 16
The shape and dimensions of the convex portion 22 and the vertical groove 21 are determined so that the convex portion 22 and the vertical groove 21 can maintain the engaged state with each other even when the floating portion is floating.

In this way, the ceramic case 16
The vertical groove 21 and the protruding portion 22 can surely maintain the engaged state even when is floating. That is, even when the ceramic case 16 is floating, the rotation of the case 1 and the ceramic case 16 is reliably prevented. Accordingly, also in Example 2, the work of placing the bimetal on the ceramic case 16 and covering the cap from above can be easily and easily performed in a state where the rotation of the ceramic case 16 is prevented.

§3: Description of Example 3—See FIG. 2A FIG. 2A is an explanatory diagram of Example 3. Hereinafter, FIG.
Example 3 will be described with reference to FIG. Example 3 improves the ease of positioning at the time of assembling parts, thereby improving the performance of Example 2.
This is an example in which the assembling workability is further improved.

In this example, a vertically long convex portion 24 is formed near the opening end of the case 1. This vertically long convex portion 24 is
And at least one of them protrudes inwardly of the case 1 at a position inside the vicinity of the opening end of the case 1 and at a position where it can be engaged with the vertical groove 21 of the case 1 to form a vertically long shape. In addition, ceramic case 1
6, a vertical groove 21 is provided. The vertical groove 21 is formed by a step 25 (a portion for supporting a bimetal) of the ceramic case 16.
Formed underneath.

In this manner, the rotation of the case 1 and the ceramic case 16 can be reliably prevented in the same manner as in Example 2, but in Example 3, the vertically long projection 24 is formed on the case 1 side. Therefore, the engagement between the vertical groove 21 and the vertically long convex portion 24 is further facilitated (compared with Example 2), and the ease of positioning when assembling components can be improved.

§4: Description of Example 4—See FIG. 2B FIG. 2 is a diagram illustrating Example 4 in FIG. In Example 4, a step 25 is provided on the outer peripheral portion of the ceramic case, and the step 25
A protruding portion 29 is provided at at least one portion of the case 1 so as to protrude in a direction opposite to the bimetal (protrudes downward when used), and can be engaged with the protruding portion 29 at an open end of the case 1. This is an example in which the notch 30 is provided, and the protrusion 1 and the notch 30 are engaged with each other to prevent the case 1 and the ceramic case 16 from rotating. The other configuration is the same as each of the above examples.

[0050]

As described above, the present invention has the following effects. (1): Before putting the cap on the metal case,
Since the rotation of the ceramic case with respect to the metal case can be reliably prevented, the displacement between the metal case and the ceramic case does not occur. For this reason, it is possible to eliminate assembly defects.

(2) Since the ceramic case can be surely prevented from rotating with respect to the case before the cap is put on the case, it is possible to judge the correctness of the position of the component on the appearance during the assembly. Therefore, the work can be stabilized.

(3): In Conventional Example 2, the height of the anti-rotation groove provided at the bottom of the ceramic case is increased so that the metal case and the ceramic case can be connected even when the ceramic case is floated by the spring. Can be prevented from being disengaged, but in this case, post-processing such as milling is required to increase the height of the rotation preventing groove, which causes an increase in cost.

However, according to the present invention, the rotation of the ceramic case can be reliably prevented even when the ceramic case is floated by the spring. Therefore, the groove for increasing the height of the groove is provided at the bottom of the ceramic case as in the conventional example. Processing (for example, milling) is not required, and the cost of the product can be reduced accordingly.

(4): Since the mechanism for preventing rotation of the metal case and the ceramic case can be made reliable, simplification and easiness of component processing are improved, and variations in assembly processing accuracy are reduced. In addition, the cost of the product can be reduced and the characteristics can be stabilized. Further, it is possible to reliably prevent the lead wire drawn from the switch mechanism attached to the ceramic case from being twisted and disconnected.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram (part 1) of a tempura oil overheating prevention sensor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram (part 2) of a tempura oil overheat prevention sensor according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of Conventional Example 1.

FIG. 4 is an explanatory diagram of Conventional Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Shaft 3 Cap 4 Spring 5 Thermistor 6, 13, 25 Stepped part 7 Lead wire 8 Spring receiving part 9 Locking hole 10 Locking convex part 11 Convex part 12 Concave part 15 Bimetal 16 Ceramic case 17 Rotation preventing groove 18, 22 Projection 20 Tongue piece 21 Vertical groove 24 Vertical projection 26 Open end 29 Projection 30 Notch

Claims (2)

[Claims] 1. A switch comprising: a metal case; a metal cap covering the case; a bimetal disposed inside the cap in the case; and a switch driven by an inversion operation of the bimetal. A tempura oil overheat prevention sensor having a mechanism and a ceramic case supporting the bimetal and having the switch mechanism attached thereto, wherein a vertical groove is provided along a longitudinal direction of the sensor on an outer peripheral portion of the ceramic case; An engaging portion including a tongue or a convex portion engageable with the vertical groove is provided on the metal case and the ceramic case by rotating the vertical groove and the engaging portion. Tempura oil overheat prevention sensor characterized by prevention. 2. A switch comprising: a metal case; a metal cap covering the case; a bimetal disposed inside the cap in the case; and a switch driven by an inversion operation of the bimetal. A tempura oil overheating prevention sensor having a mechanism and a ceramic case to which the bimetal is supported, and to which the switch mechanism is attached, wherein a step portion is provided on an outer peripheral portion of the ceramic case, and at least one portion of the step portion is provided. A protrusion protruding in a direction opposite to the bimetal is provided, a notch portion engageable with the protrusion is provided at an open end of the metal case, and the protrusion and the notch are provided. Wherein the rotation of the metal case and the ceramic case is prevented, thereby preventing the tempura oil from overheating.