JPH0588422U - Temperature detection device such as rice cooker - Google Patents

Abstract

(57) [Summary] [Structure] The lid 3a of the inner case 3 facing the temperature detection target 100 has an elastic member 10 having good heat resistance and thermal conductivity.
Is provided so that the elastic member 10 comes into surface contact with the lower surface of the temperature detection target 100, and the elastic member 10 is provided.
Is provided with a temperature sensitive element 6. [Effect] Even if a gap is generated between the lower surface of the temperature detection target 100 and the upper surface of the lid 3a of the inner case 3, the elastic member 10 provided with the temperature sensitive element 6 has elasticity. The temperature is detected by absorbing the gap by force.
Since the surface of the temperature sensing element 6 directly contacts with the lower surface of the temperature sensing element 6, the temperature sensing element 6 can stably and accurately detect the temperature of the temperature sensing object 100.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature detecting device used in cookers such as rice cookers, electric pans, electromagnetic cookers, and microwave ovens.

[0002]

[Prior Art]

 Conventionally, as a temperature detecting device such as this type of rice cooker, the one described in Japanese Utility Model Laid-Open No. 61-133939 is known. This conventional example will be described with reference to FIG. 10. Depending on the presence / absence of a temperature detection object 100 such as an inner pot such as a rice cooker, it is moved back and forth through a spring 4, and the supporting member 2 and the supporting member 2 are stored. A movable body 1 composed of an inner case 3 and a magnetically responsive switch 5 provided on the support member 2 which is turned on and off by the forward / backward movement of the movable body 1, and a temperature provided on the support member 2. The temperature sensor 6 for detecting the temperature of the detection body 100 and the outer case 7 for supporting the panel 4, the movable body 1, the switch 5 and the temperature sensor 6 are provided.

That is, the inner case 3 also serves as a receiving member for the spring 4, and the upper opening of the inner case 3 is closed by the lid 3 a in the state where the support member 2 is accommodated. An insertion hole 7b is formed in a substantially central portion of the bottom plate portion 3 of FIG. The support member 2 is composed of a pillar portion 2a, an upper collar portion 2b and a lower collar portion 2c. The pillar portion 2a is formed with a slit 20 through which the magnetic shielding plate 8 comes in and out, and the slit 20 A concave groove 21 for attaching the magnet 22 and a concave groove 23 for attaching the magnetically responsive switch 5 are formed on both sides of the concave groove. A groove 24 is formed in the center of the upper surface of the support member 2, and the temperature sensitive element 6 covered with an insulating tube 25 is fitted into the groove 24, and the upper portion of the groove is made of a metal such as stainless steel or aluminum. It is covered with the body 3a. Reference numeral 101 is a heater for the temperature detection target 100.

With the above structure, when the temperature detection target 100 does not exist on the lid 3a of the movable body 1 including the support member 2 and the inner case 3, the movable body 1 is urged by the spring 4 in FIG. Is in the up position. Therefore, since the magnetic shielding plate 8 is located in the lower direction of the slit 20, the switch 5 responds to the magnetic action from the magnet 22, and when a normal oven type reed switch is used as the switch 5, this switch 5 is used. Switch 5 is on, for example. As a result, the temperature sensing element 6 is short-circuited by the switch 5, and no current flows through the temperature sensing element 6, and the temperature detection operation is stopped. In other words, the temperature detection circuit is shut off when there is no object to be temperature detected and the temperature detection operation is unnecessary. As shown in FIG. 10, when the temperature detection object 100 is placed on the lid 3a and the temperature detection operation is required, the movable body 1 is lowered against the biasing force of the spring 4 as shown in FIG. The magnetic shielding plate 8 enters the slit 20 of the support member 2 to block the magnetism from the magnet 22 to the switch 5. As a result, the switch 5 is turned off and a current flows through the temperature sensitive element 6, and a temperature detection signal like a lead wire is taken out. By controlling the heat generation temperature of the heater with this temperature detection signal, the temperature of the temperature detection target can be controlled.

[0005]

[Problems to be solved by the device]

 However, the conventional temperature detecting device has the following problems. (B) Between the bottom surface of the temperature detecting body 100 such as an inner pot such as a rice cooker and the top surface of the lid body 3a covering the temperature sensitive element 6, dimensional error in molding between them and foreign matter such as rice grains are caught. As shown in FIG. 10, the gap S is formed due to the difference between the temperature detection object 100 and the temperature detection accuracy of the temperature detection object 100. Not heated to. In other words, since there is the above-mentioned gap S, the bottom surface of the temperature sensing object 100 and the top surface of the lid 3a are in point contact without making surface contact, so that the temperature sensing element 6 is in contact with the bottom surface of the temperature sensing object 100. The detection response time also slows down and the detection accuracy decreases. (B) Further, as shown in FIG. 10, since the temperature sensitive element 6 is configured to be fitted into the groove 24 of the support member 2, there is variation in the fitted state due to a dimensional error of the groove 24, and the like. As a result, the accuracy of temperature detection for the object to be temperature-detected 100 may be lowered, and the same drawback as in (a) may occur.

The present invention has been devised to solve all the problems of the above-described conventional example, and the above-described gap S may occur between the bottom surface of the temperature-detecting body and the top surface of the lid body. Another object of the present invention is to provide a temperature detecting device which eliminates the variation in the temperature detected by the temperature sensitive element with respect to the temperature-detected body and controls the detected temperature accurately.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention proposes a movable body that is advanced and retracted via a spring depending on the presence or absence of an object to be temperature detected and has an inner case, a switch that is turned on and off by the forward and backward movement of the movable body, and In a temperature detecting device such as a rice cooker equipped with a temperature sensitive element that detects the temperature of the temperature detecting body and at least an outer case that supports the spring and the movable body, the inner case facing the temperature detected body The lid is provided with an elastic member having good heat resistance and thermal conductivity so that the elastic member comes into surface contact with the lower surface of the temperature detection target, and the elastic member is provided with a temperature sensitive element. It will be.

The movable body may have a structure including a supporting member having a magnetically responsive switch and a magnet, and may have any design change such as one having no supporting member. The elastic member is optional as long as it is a material having good heat resistance and thermal conductivity such as silicone rubber and fluororubber. A groove may be formed in the elastic member, and the temperature sensitive element may be fitted and held in the groove. Further, the elastic member can be arbitrarily designed such that the lower portion thereof can be fitted and retained in the concave groove formed on the upper surface of the support member, and the lid of the inner case itself can be used as the elastic member. it can.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In each of these figures, the same reference numerals as those in FIG. 10 indicate the same configurations. That is, the movable body 1 composed of the support member 2 and the inner case 3 accommodating the support member 2 is lifted by the urging force of the spring 4 when the temperature detection target 100 is not placed as shown in FIG. When the temperature-detected body 100 is moved and is placed as shown in FIG. 2, the temperature-detected body 100 is in the lower position due to its own weight against the biasing force of the spring 4.

In the concave groove 23 formed on one side of the support member 2, a magnetically responsive switch 5 that is turned on / off by the forward / backward movement of the movable body 1 is formed on the other side of the support member 2. Magnets 22 are provided in the concave grooves 21, respectively. A slit 20 is formed between the concave grooves 23, 21 for inserting and removing the magnetic shielding plate 8 standing on the bottom plate 7a of the outer case 7. The spring 4, the movable body 1, the switch 5, the magnet 22, and the temperature sensitive element 6 described later are supported by the outer case 7. The respective operations of the spring 4, the movable body 1, the switch 5, the magnet 22, the temperature sensitive element 6 and the like are as described above with reference to FIG.

A through hole 3b is formed at an appropriate position of the lid 3a of the inner case 3 facing the temperature detection target 100, and a heat resistance is provided between the lid 3a of the inner case 3 and the support member 2. The elastic member 10 having good heat conductivity and having the protruding portion 10a is provided, and the protruding portion 10a of the elastic member 10 is inserted into the through hole 3b of the lid 3a to project from the upper surface of the lid 3a. The protrusion 10a is brought into surface contact with the lower surface of the temperature detection target 100, and the temperature sensitive element 6 of the elastic member 10 is provided. The elastic member 10 is formed with a concave groove 10b, and the temperature sensitive element 6 is held in the concave groove 10b so that the dimensional error of the temperature sensitive element 6 can be absorbed and the temperature sensitive element 6 can be assembled. The positioning at this time becomes reliable, the positional relationship between the temperature detection target 100 and the temperature sensing element 6 becomes more accurate, and the control of the detected temperature becomes more accurate.

However, the temperature-sensitive element 6 is not limited to the structure to be fitted into the concave groove 10b of the elastic member 10 as described above, but may be appropriately designed such as a configuration sandwiched between the upper surface of the support member 2 and the elastic member 10. Can be changed.

The elastic member 10 is attached by inserting the projecting portion 10a of the elastic member 10 into the through hole 3b of the lid 3a of the inner case 3 as in the above embodiment, and as shown in FIG. 5, for example. The elastic member 10 has a lower portion fitted and held in the concave groove 26 formed in the upper surface of the support member 2, whereby the elastic member 10 can be stably held and the assembling can be ensured. As shown in FIG. 6, the elastic member 10 has a flange portion 11 extended, and the flange portion 11 is formed at the upper opening edge of the inner case 3 and the lid of the inner case 3. By sandwiching the elastic member 10 between the bent portions 27 formed at both ends of the elastic member 3a, a sealing effect on the opening edge of the elastic member 10 can be provided.

Further, as shown in FIGS. 7 and 8, the elastic member 10 is formed of an elastic material so as to also serve as the lid 3a of the inner case 3, and the hanging portion 1 is formed at the substantially central portion of the elastic member 10. 0c may be provided vertically, and the hanging part 10c may be fitted in the groove 26 formed on the upper surface of the support member 2, while the upper surface of the elastic member 10 also serving as the lid 3a may be a smooth surface. As shown in FIG. 9, the elastic member 10 has a strip-shaped protrusion 10a formed at the center of the upper surface as shown in FIG. 5, and is formed so as to sandwich the protrusion 10a between the half-moon shaped lids 3a, 3a. It can also be applied to what you have done. In this way, the shape of the elastic member 10 and the lid 3a and the coupling method between the two can be changed as appropriate in design.

The support member 2 is preferably made of a heat-defective conductor such as resin having poor heat conduction such as ceramic because the influence of the outside air temperature is smaller. The lid 3a is preferably made of a heat-defective conductor such as stainless steel. In FIG. 3, reference numerals 30 and 31 are lead wires. This invention can be applied to the structure without the support member 2 of the above-mentioned embodiment as described above.

[0016]

[Effect of the device]

 This invention is to detect a temperature of a movable body which is advanced or retracted via a spring depending on the presence or absence of a temperature sensitive body and which has an inner case, a switch which is turned on and off by the forward and backward movement of the movable body, and a temperature of the temperature sensitive body. In a temperature detecting device such as a rice cooker including a temperature-sensitive element that operates and an outer case that supports at least the spring and the movable body, the lid of the inner case facing the temperature-detected body has a heat-resistant property. Since an elastic member having good thermal conductivity is provided so that the elastic member comes into surface contact with the lower surface of the temperature detection target, and the elastic member is provided with a temperature sensitive element, It has the following effects.

Since the elastic member provided with the temperature sensitive element has good thermal conductivity, the temperature sensitive element receives the temperature of the temperature detection target together with the elastic member. At the same time, since the elastic member is elastic, the elastic member makes surface contact with the temperature-detecting body, so the detection response time of the temperature-sensitive element to the lower surface of the temperature-detecting body becomes accurate, and The detection accuracy is also improved.

In addition to the above configuration, since the elastic member is brought into surface contact with the lower surface of the temperature detection target, as in the conventional example, between the lower surface of the temperature detection target and the upper surface of the lid of the inner case, Even if a gap is created due to a dimensional error or the trapping of foreign matter, the elastic force of the elastic member absorbs the gap and makes direct surface contact with the lower surface of the temperature detection target. The temperature element can stably and accurately detect the temperature of the temperature detection target.

Since the elastic member provided with the temperature sensitive element only needs to be provided on the lid of the inner case, the elastic member can be easily attached to the lid. According to the third or fourth aspect of the invention, there are advantages as described above.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention in which a temperature detection target is not placed.

FIG. 2 is a vertical cross-sectional view of a state in which a temperature detection target is placed.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a bottom view of the elastic member.

FIG. 5 is a vertical cross-sectional view of another modification of the elastic member.

FIG. 6 is a vertical cross-sectional view of another modification of the elastic member.

FIG. 7 is a vertical cross-sectional view of still another modified example of the elastic member.

FIG. 8 is an exploded perspective view of an elastic member and a supporting member of FIG.

FIG. 9 is an exploded perspective view of another modification of the elastic member and the lid.

FIG. 10 is a vertical cross-sectional view of a conventional example in which a temperature detection target is placed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 movable body 2 support member 3 inner case 3a lid 3b through hole 4 spring 5 switch 6 temperature sensitive element 7 outer case 8 magnetic shield plate 10 elastic member 10a protruding portion 10b concave groove 20 slit 22 magnet 23 concave groove 26 concave groove

Claims (4)

[Scope of utility model registration request] 1. The spring 4 is provided depending on the presence or absence of the temperature detection target 100.
Movable body 1 which is moved back and forth through the inner casing 3
A switch 5 that is turned on and off by the forward / backward movement of the movable body 1, a temperature sensing element 6 that detects the temperature of the temperature detection target 100, and an outer case 7 that supports at least the spring 4 and the movable body 1. In a temperature detecting device such as a rice cooker, the lid 3 of the inner case 3 facing the temperature detection target 100 is provided.
An elastic member 10 having good heat resistance and thermal conductivity is provided in a so that the elastic member 10 comes into surface contact with the lower surface of the temperature detection target 100, and the elastic member 10 has a temperature sensing element. 6. A temperature detecting device such as a rice cooker, which is provided with 6. 2. The temperature detecting device for a rice cooker or the like according to claim 1, wherein the movable body 1 is provided with a support member 2 having a magnetically responsive switch 5 and a magnet 22. 3. A groove 10b is formed in the elastic member 10,
The temperature detecting device for a rice cooker or the like according to claim 1 or 2, wherein the temperature sensitive element 6 is fitted and held in the groove 10b. 4. The elastic member (10) has a lower portion thereof supporting member (2).
3. The concave groove 26 formed on the upper surface of the base member is fitted and held.
Or a temperature detecting device such as the rice cooker described in 3.