JPH08219903A - Heat-sensitive unit - Google Patents

Abstract

PURPOSE: To obtain a heat-sensitive element in which thermal detection error due to thermal expansion/contraction is prevented and a heat-sensitive element is surely protected against the deterioration due to overflow of liquid or oil. CONSTITUTION: An enclosure comprises a metal cap 11 having a continuous side wall 112 formed around the bottom part 111 and the outer face 113 at the bottom part 111 constitutes a heat-sensitive face. A thermal detector 2 is disposed in the metal cap 11 and a heat-sensitive element 21 is disposed in the inner space of an insulating case 22 while being coupled thermally with the inner face 223 of the side wall 222. A fixing member 3 is provided fixedly to the inner face 114 of the metal cap 11 and provided with spring pieces 31, 32 for pressing the insulation case 22 of thermal detector 2 against the inner face 114 of the metal cap 11.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat sensitive device.

[0002]

2. Description of the Related Art In a combustor such as a gas stove or a rice cooker, a heat-sensitive device for detecting the temperature of an object to be heated such as a pan is known from JP-A-4-115131 and JP-A-5-92666. There is. In the heat-sensitive device or the temperature detection device known from these prior art documents, the heat-sensitive element is fixedly attached to the holder having the temperature measuring surface. One of the problems that occurs when such a structure is adopted is that, in the temperature detecting operation, the holder thermally expands due to the heat transferred from the object to be heated, which causes thermal coupling between the holder and the heat-sensitive element. It is changed, and a heat detection error occurs. After the object to be heated has cooled, the holder undergoes thermal contraction, so that the mechanical coupling between the holder and the heat-sensitive element changes. Since such thermal expansion and thermal contraction occur each time the heating operation and the heating operation stop are repeated, the heat detection error tends to increase as the number of times of use increases.

In the case of a heat-sensitive device for detecting the temperature of an object to be heated such as a pot in a combustor such as a gas stove, in addition to the above-mentioned detection error caused by thermal expansion and contraction, boiling juice or oil is generated. There is also deterioration of the heat-sensitive device due to overflow from the pan. Juice, oil, or the like overflowing from the pan enters the inside of the holder having the heat-sensitive element through a slight gap existing in the heat-sensitive device due to a capillary phenomenon and deteriorates the heat-sensitive element. The above-mentioned prior art documents do not consider deterioration of the heat-sensitive element due to overflow of juice or oil, and do not disclose means for preventing the deterioration.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat-sensitive device capable of preventing a heat detection error due to thermal expansion and contraction.

Another object of the present invention is to provide a heat-sensitive device which can surely prevent deterioration of the heat-sensitive element due to overflow of juice or oil.

[0006]

In order to solve the above-mentioned problems, a heat-sensitive device according to the present invention includes an exterior body, a heat detecting device, and a mounting member. The exterior body includes a metal cap, and the metal cap has a side wall continuous around a bottom portion, and an outer surface of the bottom portion constitutes a heat-sensitive surface. The heat detecting device includes a heat sensitive element and an insulating case, is arranged in the metal cap, and the heat sensitive element is housed inside the insulating case. The mounting member has at least one spring piece, is fixedly provided on the inner surface of the metal cap, and presses the insulating case of the heat detecting device against the inner surface of the metal cap by the spring pressure of the spring piece. There is.

In the heat-sensitive device according to the present invention, a preferred mode of the heat detecting device is as follows. First, the heat sensitive element is preferably a positive temperature coefficient thermistor. The positive temperature coefficient thermistor has electrodes on both sides in the thickness direction, and a type in which a pair of electrode plates individually makes surface contact with each of the electrodes is suitable. One of the electrode plates is preferably an elastic electrode plate that applies a spring pressure to the PTC thermistor. Each of the electrode plates has a lead terminal portion, and each of the lead terminal portions is preferably led out of the insulating case at a position deviated from the center line of the heat detecting device.

A preferred embodiment of the insulating case is as follows. First, in the insulating case, the surface pressed against the inner surface of the metal cap is preferably a flat surface or a gentle spherical convex surface. Next, the insulating case is
There is an internal space for accommodating the heat sensitive element, the side facing the bottom of the internal space is open, the opening is closed by a lid, and the outer surface of the bottom is in close contact with the inner surface of the metal cap for thermal coupling. are doing.

A preferred embodiment of the mounting member is as follows. First, the mounting member has a frame portion, and the inner surface of the metal cap is shown in a region surrounded by the frame portion, and the heat detection device is arranged in the region surrounded by the frame portion. Thermally bonded to the inner surface of the metal cap. In a further preferred aspect of this case, the spring piece of the mounting member is formed continuously with the frame portion.
At least two spring pieces may be provided, and the spring pieces may be arranged so as to hold the heat detection device from opposite sides. The number of the spring pieces is one, and may be arranged so as to cross the heat detection device. As still another preferable aspect, the frame portion may have a protrusion that prevents the heat detection device from being displaced.

In the metal cap included in the outer body, the outer surface of the bottom portion constitutes a heat-sensitive surface. In the heat detecting device, the heat-sensitive element is housed inside the insulating case, and the insulating case is pressed against the inner surface of the metal cap. ing. Thus, the heat transferred from the heat-sensitive body to the heat-sensitive surface of the metal cap is transferred from the metal cap to the insulating case and detected by the heat-sensitive element housed in the insulating case.

The metal cap has a continuous side wall around the bottom, the heat sensing device is disposed within the metal cap, and the heat sensitive element is housed inside the insulating case. With the structure described above, a double barrier is formed between the outer surface of the bottom of the metal cap, which is the heat-sensitive surface, and the heat-sensitive element, by the continuous side wall of the metal cap and the insulating case. For this reason, even if the soup or oil overflows from the heat-sensitive body on the heat-sensitive surface, for example, the pot, the probability that the soup or oil will adhere to the heat-sensitive element in the insulating case becomes extremely low.

Further, the heat-sensitive device according to the present invention includes a mounting member, and the mounting member has a spring piece and is fixedly provided on the inner surface of the metal cap, and the insulating case of the heat detecting device is provided by the spring pressure of the spring piece. Since it is pressed against the inner surface of the metal cap,
When the metal cap thermally expands due to the heat of the heat-sensitive body, or when the heat-sensitive body cools and the metal cap thermally contracts,
The expansion and contraction of the metal cap due to the thermal expansion and contraction is absorbed by the elasticity of the spring piece of the mounting member. Therefore, the heat detecting device is stably thermally coupled to the metal cap without being affected by the thermal expansion and contraction of the metal cap. This can prevent a heat detection error due to thermal expansion and thermal contraction.

In a preferred example in which the heat-sensitive element is a positive temperature coefficient thermistor, it is possible to realize a heat-sensitive device having a simple circuit configuration by omitting the level verification circuit and the switch circuit by utilizing the excellent switch characteristics of the positive temperature coefficient thermistor.

When an insulating case whose surface pressed against the inner surface of the metal cap is a flat surface or a gentle spherical convex surface is used, the insulating case can be closely attached to the inner surface of the metal cap by the spring pressure of the spring piece. it can. Therefore, a close thermal bond can be formed between the central portion of the PTC thermistor located in the insulating case and the metal cap. In addition, even if the metal cap thermally expands or contracts, it can follow that and maintain stable thermal coupling.

Other features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0016]

1 is a partial sectional view of a heat-sensitive device according to the present invention, FIG. 2 is an enlarged partial cross-sectional view of an assembly constituting a part of the heat-sensitive device shown in FIG. 1, and FIG. 1 is an enlarged partial sectional view showing an assembly forming a part of the heat-sensitive device according to the present invention shown in FIG. 1, FIG. 4 is a bottom view of the assembly shown in FIGS. 2 and 3, and FIG. 4 is a sectional view taken along line A5-A5 of FIG. Referring to these drawings, the heat sensitive device includes an outer casing 1, a heat detecting device 2, and a mounting member 3. Exterior body 1
Includes a metal cap 11, the metal cap 11 having a continuous sidewall 112 around a bottom 111,
The outer surface 113 of 11 constitutes a heat-sensitive surface. The metal cap 11 can be formed of a thin metal plate such as copper, brass, phosphor bronze or stainless steel. By applying nickel plating or the like to the surface of the metal cap 11,
Heat resistance can also be improved.

The structure of the heat-sensing device 2 is clearly illustrated in FIGS. 3 and 4, in particular. To refer to these figures,
The heat detection device 2 includes a heat sensitive element 21 and an insulating case 22, and is arranged inside the metal cap 11. The heat sensitive element 21 is thermally coupled and housed inside the insulating case 22. The heat sensitive element 21 has a disk shape or a rectangular plate shape, is arranged in the internal space 221 of the insulating case 22, and has a side wall 222.
Is thermally coupled to the inner surface 223 of the.

Next, the mounting member 3 is fixedly provided on the inner surface 114 of the metal cap 11. As the fixing means, spot welding or the like can be adopted. Mounting member 3
Has two spring pieces 31, 32, and the spring pieces 31, 32
The insulating case 22 of the heat detecting device 2 is pressed against the inner surface 114 of the metal cap 11 by the spring pressure.

In the embodiment shown in FIGS. 1 to 5, the exterior body 1
Further includes a first tubular body 12, a second tubular body 13, and a coil spring 14. The first cylindrical body 12 is
One end side in the axial direction is inserted into and fixed to the opening of the metal cap 11. The second tubular body 13 has one end side in the axial direction loosely inserted into the other end side in the axial direction of the first tubular body 12, whereby the axial direction Y1 or Y2 is formed between the second tubular body 13 and the first tubular body 12. Relative movement of is allowed. The coil spring 14 includes the metal cap 11 and the first tubular body 1.
It is arranged between the second cylinder 13 and the second cylinder 13.

A retaining mechanism 15 is formed between the first cylinder 12 and the second cylinder 13. The retaining mechanism 15 can prevent the metal cap 11 and the first tubular body 12 from jumping out of the second tubular body 13 due to the spring pressure of the coil spring 14 when the heat-sensitive body 4 is removed. In the illustrated retaining mechanism 15, the first cylindrical body 12 is provided.
The narrow part 121 is formed by narrowing the middle part of the
The upper half part of the cylindrical body 13 is a large diameter part 131 slightly smaller than the inner diameter of the first cylindrical body 12, and the lower half part is a small diameter part 132 slightly smaller than the inner diameter of the narrow width part 121. Body 1
The narrow width portion 121 receives a step caused by a diameter difference between the large diameter portion 131 and the small diameter portion 132 of No. 3.

FIG. 6 is a view showing a usage state of the heat-sensitive device according to the present invention, in which a heat-sensitive body 4 such as a pot is placed on the heat-sensitive surface 113. Juice or oil, etc. in the heat-sensitive body 4
Is included. The second tubular body 13 has one axial end thereof loosely inserted into the other axial end of the first tubular body 12, whereby the axial direction Y1 between the second tubular body 13 and the first tubular body 12 is increased.
Alternatively, the relative movement of Y2 is allowed. The coil spring 14 includes the metal cap 11, the first cylindrical body 12, and the second
Is disposed between the cylindrical body 13 and the cylindrical body 13. This structure allows
When the heat-sensitive body 4 is placed on the heat-sensitive surface 113 of the metal cap 11, the metal cap 11 and the first cylindrical body 12 resist the elasticity of the coil spring 14 and the axial direction Y1 with respect to the second cylindrical body 13. Or it moves relative to Y2. Then, it stops at a position where the total weight of the heat-sensitive body 4 (see FIG. 6) including the juice or oil 41 and the spring pressure of the coil spring 14 are balanced. Due to the relative movement action and the spring action, the impact when the heat-sensitive body 4 is installed on the heat-sensitive surface 113 is reliably reduced.

Here, in the metal cap 11 included in the outer package 1, the outer surface 113 of the bottom portion 111 constitutes a heat-sensitive surface, and in the heat detecting device 2, the heat-sensitive element 21 is housed inside the insulating case 22 and insulated. Since the case 22 is pressed against the inner surface 114 of the metal cap 11, the heat transferred from the heat-sensitive body 4 to the heat-sensitive surface 113 of the metal cap 11 is transferred from the metal cap 11 to the insulating case 22 and the insulating case 22. It is detected by the heat sensitive element 21 housed inside.

Further, the metal cap 11 has a side wall 112 continuous around the bottom portion 111, the heat detecting device 2 is arranged in the metal cap 11, and the heat sensitive element 21 is housed in the insulating case 22. Therefore, between the bottom outer surface 113 of the metal cap 11 serving as the heat-sensitive surface 113 and the heat-sensitive element 21, a double barrier is formed by the continuous side wall 112 and the insulating case 22. Therefore, even if the soup or oil 41 or the like 41 overflows from the heat-sensitive body 4 on the heat-sensitive surface 113, for example, a pan, the probability that the soup or oil 41 adheres to the heat-sensitive element 21 in the insulating case 22 becomes extremely low. .

Further, the heat-sensitive device according to the present invention includes a mounting member 3, and the mounting member 3 has spring pieces 31 and 32, which are fixedly provided on the inner surface 114 of the metal cap 11, and the spring pieces 31 and 32 are provided. Insulation case 2 of heat detector 2 due to the spring pressure of
Since 2 is pressed against the inner surface 114 of the metal cap 11, the metal cap 11 thermally expands due to the heat of the heat-sensitive body 4, or the heat-sensitive body 4 has cooled and the metal cap 1
When 1 is thermally contracted, the expansion and contraction of the metal cap 11 due to these thermal expansion and thermal contraction causes the spring piece 31 of the mounting member 3 to move.
It is absorbed by the elasticity of 32. Therefore, the heat detection device 2 is stably thermally coupled to the metal cap 11 without being affected by the thermal expansion and contraction of the metal cap 11. This can prevent a heat detection error due to thermal expansion and contraction.

The heat-sensitive element 21 of the illustrated heat detection device 2
Is a positive temperature coefficient thermistor. This allows
By utilizing the excellent switch characteristics of the positive temperature coefficient thermistor, it is possible to realize a heat sensitive device having a simple circuit configuration without the level verification circuit and the switch circuit. The insulating case 22 is used for the thermosensitive element 2.
It has an internal space 221 for housing 1. Interior space 221
Has an opening on the side opposite to the bottom 222, and the opening is the lid 2
3 closed. The insulating case 22 has a bottom 2
The outer surface 225 of 24 closely contacts and thermally bonds to the inner surface 114 of the metal cap 11. Therefore, since the opening side of the insulating case 22 having the lid 23 faces downward, it is more difficult for the juice 41 or the oil 41 to enter the insulating case 22.

Further, the heat detecting device 2 includes a pair of electrode plates 24,
Includes 25. The electrode plates 24 and 25 are in surface contact with the electrodes (not shown) of the positive temperature coefficient thermistor that constitutes the thermosensitive element 21. Each of the electrode plates 24 and 25 has lead terminal portions 241 and 251.
1 is led out from the gap between the insulating case 22 and the lid 23. The lead terminal portions 241 and 251 are led out to the outside at positions deviated from the center line of the heat detection device 2.

One of the electrode plates 24 and 25 may be an elastic electrode plate that applies a spring pressure to the thermosensitive element 21 which is a positive temperature coefficient thermistor. The insulating case 22 can be made of, for example, an electrically insulating material having good thermal conductivity such as alumina. The electrode plates 24 and 25 are made of, for example, stainless steel plates or the like. The heat resistance can also be improved by applying nickel plating or the like to the surfaces of the electrode plates 24 and 25.

The gap between the insulating case 22 and the lid 23 is sealed with a heat resistant seal material. As a result, it is possible to prevent juice, oil, or the like 41 from entering the insulating case 22 into the insulating case 22. Heat resistant lead wires 26 and 27 are connected to the electrode plates 24 and 25. Also, the second
A mounting arm 28 is fixedly provided at the lower end of the cylindrical body 13.

Next, the insulating case 22 has a metal cap 1
The surface 225 pressed against the inner surface 14 of No. 1 is flat. When such an insulating case 22 is used, the inner surface 1 of the metal cap 11 is pressed by the spring pressure of the spring pieces 31 and 32.
The insulating case 22 can be closely attached to 14. Therefore, close thermal coupling can be formed between the central portion of the PTC thermistor 21 located inside the insulating case 22 and the metal cap 11. Moreover, the metal cap 1
When 1 expands or contracts thermally, it can follow it and maintain a stable thermal bond.

Next, details of the mounting member 3 will be described. The mounting member 3 is preferably composed of a thin metal plate having spring properties such as steel or stainless steel. The illustrated mounting member 3 has a frame portion 33, and a metal cap 11 is provided in an area 34 surrounded by the frame portion 33.
The inner surface 114 of the is shown. The heat detection device 2 includes a frame portion 33.
In a region 34 surrounded by
1 to the inner surface 114. Although the illustrated frame portion 31 is formed in a continuous ring shape, it may be divided into a plurality of pieces.

The spring pieces 31 and 32 of the mounting member 3 are formed by the frame 3
1 is formed continuously. Two spring pieces 31 and 32 are provided, and are arranged so as to hold the heat detection device 2 from opposite sides. The frame 33 has protrusions 351 to 354 that prevent the heat detection device 2 from being displaced.

Next, another embodiment of the heat-sensitive device according to the present invention will be described with reference to FIGS. In these drawings, the same reference numerals as those in FIGS. 1 to 6 denote the same components.

FIG. 7 is a partial front sectional view of the heat-sensitive device according to the present invention, FIG. 8 is a bottom view of the heat-sensitive device shown in FIG. 7, and FIG. 9 is a left-side partial cross-sectional view of the heat-sensitive device shown in FIG. 10 is shown in FIG.
10 is a cross-sectional view taken along line A10-A10 of FIG. In this embodiment, the insulating case 22 has an internal space 221 for accommodating the heat sensitive element 21. The inner space 221 has an opening on the side facing the bottom portion 224, and the opening is closed by the lid 23. The outer surface 225 of the bottom portion 224 of the insulating case 22 is in close contact with the inner surface 114 of the metal cap 11 for thermal bonding. The PTC thermistor that constitutes the heat-sensitive element 21 has a disk shape or a rectangular plate shape, and has an internal space 22 of the insulating case 22.
1 and is thermally coupled to the inner surface of the bottom 224.
Therefore, the heat-sensitive surface 1 set on the outer surface 225 of the bottom portion 224
13 and the thermosensitive element 2 which is thermally coupled to the inner surface of the bottom portion 224.
The plate thickness of the bottom portion 224 is only interposed between the No. 1 and the No. 1. Therefore, heat is efficiently and promptly transferred from the heat-sensitive surface 113 to the heat-sensitive element 21.

FIG. 11 is a bottom view of the heat-sensitive device according to the present invention,
12 is a sectional view taken along the line A12-A12 of FIG.
13 is a sectional view taken along the line A13-A13 of FIG.
FIG. 14 is a sectional view taken along the line A14-A14 in FIG. In this embodiment, in the insulating case 22, the surface 225 pressed against the inner surface 14 of the metal cap 11 is a gentle spherical convex surface. When such an insulating case 22 is used, the inner surface 11 of the metal cap 11 is deformed along the spherical surface 225 of the insulating case 22 by the spring pressure of the spring pieces 31 and 32, and the inner surface 114 of the metal cap 11 is deformed. The insulating case 22 can be closely attached.
Therefore, even when the bottom portion 111 of the metal cap 11 is distorted, the center portion of the positive temperature coefficient thermistor 21 located inside the insulating case 22 and the metal cap 11 are prevented.
A tight thermal bond can be formed between and. In addition, even when the metal cap 11 thermally expands or contracts, it can follow it and maintain stable thermal coupling.

The insulating case 22 has an internal space 221 for accommodating the heat sensitive element 21. The inner space 221 is the bottom 22
The side facing 4 is open, and the opening is closed by a lid 23. The outer surface 225 of the bottom portion 224 of the insulating case 22 is in close contact with the inner surface 114 of the metal cap 11 for thermal bonding. The PTC thermistor that constitutes the heat-sensitive element 21 has a disk shape or a rectangular plate shape, is arranged in the inner space 221 of the insulating case 22, and is thermally coupled to the inner surface of the bottom portion 224. Since the heat-sensitive element 21 is thermally coupled to the inner surface 227 of the bottom portion 224, the heat-sensitive surface 1 set on the outer surface of the bottom portion 224.
The plate thickness of the bottom portion 224 is merely interposed between the heat sensitive element 21 and the heat sink element 13. Therefore, heat is efficiently and promptly transferred from the heat-sensitive surface 113 to the heat-sensitive element 21.

The electrode plates 24 and 25 have lead terminal portions 24.
1 and 251 and lead terminal portions 241 and 251.
Pass through the groove portion 227 provided on the inner side surface of the insulating case 22, and are led out of the insulating case 22 with a space between the groove portion 227 and the side surface of the positive temperature coefficient thermistor 21. Thereby, the distance between different poles and the insulation distance between the mounting member 3 and the lead terminal portions 241 and 251 can be secured, and the electrode plates 24 and 25 can be accurately positioned in the groove portion 227.

The mounting member 3 includes one spring piece 31,
The spring piece 31 is arranged in a groove 226 formed across the lid 23, and both ends thereof are pressed by the pressing pieces 36 and 37. The pressing pieces 36 and 37 are formed by bending the doughnut-shaped frame portion 33 from the outer periphery to the inside. The insulating case 22 is arranged inside a circular cutout hole 34 formed inside the frame portion 33. The frame 33 is provided with a positioning projection 35 that is bent outward on the inner peripheral edge.
1 and 352.

FIG. 15 is a view showing still another embodiment of the heat-sensitive device according to the present invention and corresponds to a modification of the embodiment shown in FIGS. 11 to 14. In the present embodiment, both ends 311 and 312 of the spring piece 31 are pressed by the projections 115 and 116 formed by recessing the outer peripheral surface of the metal cap 11 inward, and are thereby coupled to the metal cap 11.

Although not shown, both ends 311 and 312 of the spring piece 31 may be provided with rotation preventing projections. Further, in the case of any of the embodiments shown in FIGS. 7 to 15, the assembly as shown in FIG. 1 is configured, and the same effects as those described with reference to FIGS. 1 to 6 are obtained.

FIG. 16 is a sectional view showing another embodiment of the heat generating device according to the present invention. The feature of this embodiment is that the heat-sensitive surface 113 of the bottom portion 111 that constitutes the metal cap 11 has an arc shape. 17 and 18 are views showing a usage state of the heat-sensitive device shown in FIG.
A heat-sensitive body 4 such as a pot is placed on top of 3. When the object 4 to be heated is placed on the heating device in a non-tilted state, the object 4 to be heated contacts the substantially central portion of the heat-sensitive surface 113 as shown in FIG. 17, thereby performing the heat-sensitive operation. When the object to be heated 4 is placed on the heating device without inclination,
As shown in FIG. 17, the object to be heated 4 contacts at substantially the center of the heat-sensitive surface 113, whereby the heat-sensitive operation is performed.
Even when tilted as shown in FIG. 18, since the heat-sensitive surface 113 of the bottom portion 111 that constitutes the metal cap 11 has an arc shape, the body to be heated 4 is within the surface of the heat-sensitive surface 113 and the heat-sensitive surface 1
Contact 13. Therefore, the body to be heated 4 is placed on the heat sensitive surface 113.
Even when it is arranged to be inclined with respect to, the heat-sensitive operation can be performed without significantly impairing the thermal conductivity.
When the heat-sensitive surface 113 is a flat surface, the heated object 4
When the heat-dissipating surface 113 is inclined with respect to the heat-sensitive surface 113, the heated body 4 contacts at the corner of the metal cap 11. For this reason,
The thermal conductivity from the object to be heated 4 to the heat-sensitive device is impaired and the thermal conduction is delayed.

FIGS. 19 to 21 are views showing another example of the heat-sensitive surface 113 corresponding to the inclined arrangement of the object to be heated and its usage state. In the heat-sensitive device shown in FIG. 19, an example is shown in which the central portion of the heat-sensitive surface 113 is a flat surface and the outer peripheral portion is an inclined surface. In the case of this embodiment, when the object 4 to be heated is placed on the heating device in a state where there is no inclination, the object 4 to be heated is a flat surface provided in the central portion of the heat sensitive surface 113, as shown in FIG. To make a thermal motion.
Even when the object to be heated 4 is inclined as shown in FIG. 20, the object to be heated 4 contacts at the portion where the flat surface forming the heat-sensitive surface 113 and the inclined surface are continuous. The portion where the flat surface and the inclined surface are continuous is located inside the corner of the metal cap 11. Therefore, even if the body to be heated 4 is arranged to be inclined with respect to the heat-sensitive surface 113, the heat-sensitive operation can be performed without significantly impairing the thermal conductivity.

22 to 24 are views showing another example of the heat-sensitive surface 113 corresponding to the inclined arrangement of the object to be heated 4 and its usage state. In the heat-sensitive device shown in FIG. 22, an example is shown in which the central portion of the heat-sensitive surface 113 is a flat surface and the outer peripheral portion is an arc-shaped inclined surface. In the case of this embodiment, when the object 4 to be heated is placed on the heating device without being inclined, the object 4 to be heated is a flat surface provided in the central portion of the heat sensitive surface 113, as shown in FIG. To make a thermal motion. When the heated body 4 is inclined as shown in FIG. 24,
The object to be heated 4 contacts at the portion where the flat surface forming the heat-sensitive surface 113 and the arcuate inclined surface are continuous. The part where the flat surface and the arcuate inclined surface are continuous is located inside the corner of the metal cap 11. Therefore, even if the body to be heated 4 is arranged to be inclined with respect to the heat-sensitive surface 113, the heat-sensitive operation can be performed without significantly impairing the thermal conductivity.

[0043]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a heat sensitive device that can prevent a heat detection error due to thermal expansion and thermal contraction. (B) It is possible to provide a heat-sensitive device that can reliably prevent deterioration of the heat-sensitive element due to overflow of juice or oil.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a heat sensitive device according to the present invention.

2 is an enlarged partial cross-sectional view showing an assembly that constitutes a part of the heat-sensitive device shown in FIG.

3 is an enlarged partial cross-sectional view showing an assembly forming a part of the heat-sensitive device according to the present invention shown in FIG.

FIG. 4 is a bottom view of the assembly shown in FIGS. 2 and 3.

5 is a cross-sectional view taken along the line A5-A5 of FIG.

FIG. 6 is a diagram showing a usage state of the heat sensitive device according to the present invention.

FIG. 7 is a partial front sectional view of another embodiment of the heat-sensitive device according to the present invention.

FIG. 8 is a bottom view of the heat-sensitive device shown in FIG.

9 is a partial left side sectional view of the heat sensitive device shown in FIG. 7. FIG.

10 is a cross-sectional view taken along the line A10-A10 of FIG.

FIG. 11 is a bottom view showing still another embodiment of the heat-sensitive device according to the present invention.

12 is a cross-sectional view taken along the line A12-A12 of FIG.

13 is a cross-sectional view taken along the line A13-A13 of FIG.

14 is a cross-sectional view taken along the line A14-A14 in FIG.

FIG. 15 is a view showing still another embodiment of the heat-sensitive device according to the present invention, and corresponds to a modification of the embodiment shown in FIGS. 11 to 14.

FIG. 16 is a cross-sectional view showing another embodiment of the heat generating device according to the present invention.

17 is a diagram showing a usage state in a normal arrangement of the heat-sensitive device shown in FIG.

FIG. 18 is a diagram showing a usage state of the heat sensitive device shown in FIG. 16 in an inclined arrangement.

FIG. 19 is a sectional view showing another embodiment of the heat generating device according to the present invention.

20 is a diagram showing a usage state in a normal arrangement of the heat-sensitive device shown in FIG.

FIG. 21 is a view showing a usage state of the heat sensitive device shown in FIG. 19 in an inclined arrangement.

FIG. 22 is a cross-sectional view showing another embodiment of the heat generating device according to the present invention.

FIG. 23 is a diagram showing a usage state of the heat sensitive device shown in FIG. 22 in a normal arrangement.

FIG. 24 is a diagram showing a usage state of the heat-sensitive device shown in FIG. 22 in an inclined arrangement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior body 2 Heat detection device 3 Mounting member 11 Metal cap 111 Bottom part 112 Side wall 113 Outer surface 21 Thermal element 22 Insulation case 221 Internal space 3 Mounting member 31, 32 Spring piece

Claims (14)

[Claims] 1. A heat sensitive device including an outer body, a heat detecting device, and a mounting member, wherein the outer body includes a metal cap, and the metal cap has a side wall continuous around a bottom portion, The outer surface of the bottom portion constitutes a heat-sensitive surface, and the heat detection device includes a heat-sensitive element and an insulating case,
The heat sensitive element is disposed inside the metal cap, is housed inside the insulating case, and is thermally coupled to an inner wall surface of the insulating case, the mounting member includes at least one spring piece, and the metal cap is provided. A heat sensitive device that is fixedly provided on the inner surface of the metal cap and presses the insulating case of the heat detecting device against the inner surface of the metal cap by the spring pressure of the spring piece. 2. The heat sensitive device according to claim 1, wherein the heat sensitive element is a positive temperature coefficient thermistor. 3. The heat-sensitive device according to claim 2, wherein the positive temperature coefficient thermistor has electrodes on both sides in a thickness direction, and a pair of electrode plates individually come into surface contact with each of the electrodes. Heat sensitive device. 4. The heat sensitive device according to claim 3, wherein one of the electrode plates is an elastic electrode plate that applies a spring pressure to the PTC thermistor. 5. The heat-sensitive device according to claim 3, wherein each of the electrode plates has a lead terminal portion,
Each of the lead terminal portions is a heat sensitive device that is led out of the insulating case at a position deviated from the center line of the heat detecting device. 6. The heat sensitive device according to claim 3, wherein each of the electrode plates has a lead terminal portion,
Each of the lead terminal portions passes through a groove provided on the inner side surface of the insulating case, and is led to the outside of the insulating case with a gap maintained between the lead terminal portion and the side surface of the positive temperature coefficient thermistor. 7. The heat sensitive device according to claim 1, wherein a surface of the insulating case pressed against the inner surface of the metal cap is a flat surface or a gently spherical convex surface. 8. The heat-sensitive device according to claim 1, wherein the insulating case has an internal space for housing the heat-sensitive element, and the internal space has an opening on a side facing a bottom portion, and the opening is A heat-sensitive device which is closed by a lid and has an outer surface that is in close contact with and thermally coupled to the inner surface of the metal cap. 9. The heat sensitive device according to claim 1, wherein the attachment member has a frame portion, and the attachment member has a frame portion. The inner surface of the metal cap is shown in the enclosed area, and the heat detection device is thermally coupled to the inner surface of the metal cap in the area surrounded by the frame portion. 10. The heat sensitive device according to claim 9, wherein the spring piece of the attachment member is formed continuously with the frame portion. 11. The heat sensitive device according to claim 9, wherein at least two spring pieces are provided, and the spring pieces are arranged so as to hold the heat detecting device from opposite sides thereof. 12. The heat-sensitive device according to claim 9, wherein the number of the spring pieces is one, and the heat-sensitive device is arranged so as to cross the heat detection device. 13. The heat sensitive device according to claim 7, wherein the frame portion has a protrusion that prevents the heat detecting device from being displaced. 14. The heat sensitive device according to claim 1, wherein a central portion of the heat sensitive surface of the metal cap projects more than a peripheral portion.