JPH1118932A - Sensor mounting structure for rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently mount a temperature detecting sensor with a simple structure. SOLUTION: The-bottom wall of a housing chamber 14 has a housing recessed part 20 for arranging a temperature detecting sensor 23, which recessed part has a locking recessed part. The temperature detecting sensor 23 is formed of an element part, a cover part having the element part integrally installed thereto and a locking part to be engagingly locked by the locking recessed part, and an energizing means arranged between the cover part and the housing recessed part 20 to energize the cover part 25 so as to make contact with the bottom surface of an inner pan 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center sensor mounting structure for detecting the temperature of an inner pot of a rice cooker.

[0002]

2. Description of the Related Art In a rice cooker, rice cooking control is performed by detecting the temperature at the center of the bottom surface of an inner pot with a temperature detection sensor.

Conventionally, the temperature detection sensor has a configuration shown in FIG. That is, the heat-sensitive plate 2 is provided at the upper opening of the cylindrical casing 1 so as to be able to protrude and retract. The casing 1 houses a temperature detecting element 3 and a spring 4, and its lower opening is closed by a bottom 5. The heat-sensitive plate 2 is urged by the spring 4 in a direction protruding from the casing 1.

[0004]

However, in the conventional temperature detecting sensor, it is necessary to attach the bottom body 5 to the rice cooker by screwing it, and the workability is poor.
Further, this temperature detection sensor has a complicated structure and a large number of parts.

Accordingly, an object of the present invention is to provide a rice cooker sensor mounting structure in which a temperature detection sensor can be efficiently mounted with a simple configuration.

[0006]

Means for Solving the Problems According to the present invention, as a means for solving the above-mentioned problems, the present invention is applied to a bottom wall of a storage chamber in a rice cooker main body and a bottom surface of an inner pan stored in the storage chamber. In a rice cooker sensor mounting structure in which a temperature detection sensor for detecting and detecting the temperature of the temperature sensor can be mounted, a bottom wall of the storage chamber is provided with a storage recess provided with the temperature detection sensor and having a lock receiving portion. On the other hand, the temperature detection sensor has
An element part, a cover part having the element part integrally mounted thereon and having a locking part locked by the locking receiving part, and a cover part provided between the cover part and the housing recess. And urging means for urging the inner pot to contact the bottom surface of the inner pot.

[0007] With this configuration, the temperature detection sensor can be easily mounted simply by disposing the temperature detection sensor in the housing recess and locking the locking portion to the locking receiving portion.

The engaging portion comprises a plurality of protruding portions having a claw at the tip, and the engaging receiving portion is formed continuously with an insertion hole through which the claw is inserted and the insertion hole. The claw portion may be provided with a locking hole portion locked to the edge.

It is preferable to form a locking recess at the edge of the locking hole to prevent the claws from returning, since the temperature detection sensor will not fall off during the assembly work of other components.

The accommodation chamber is formed by a body and a protection frame, and the protection frame is assembled to the body after the claw of the engagement portion is engaged with the engagement surface of the bottom wall of the accommodation chamber. In addition, it is preferable to have a reversing prevention piece for preventing the locking portion from reversing in that a more reliable mounting state of the temperature detection sensor can be obtained.

It is preferable that the locking portion also serves as a guide for a cord connected to the element portion, since the structure of the cover portion of the temperature detection sensor can be further simplified.

The locking portion comprises a plurality of elastic projections provided with claw portions projecting outward, and the locking receiving portion comprises an opening having an inner edge on which the claw portion is locked, The storage chamber is formed by a body and a protection frame, and the protection frame is assembled to the body after the claw of the locking portion is locked to the inner edge of the opening of the locking receiving portion. A deformation preventing portion for preventing elastic deformation of the elastic protrusion to the inside may be provided.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a rice cooker provided with a sensor mounting structure according to the present invention. This rice cooker has a body 11a
An accommodating chamber 14 is formed by the inner trunk 12 and the protective frame 13 in the rice cooker main body 11 composed of the rice cooker body 11 and the bottom 11b. An inner pan 15 is housed in the housing chamber 14 so as to be able to be taken out.

A pair of rotation preventing projections 16 are provided on the bottom 11b of the rice cooker main body 11 to project inward.

The protective frame 13 is provided with an induction heating coil 19 for inductively heating the inner pot 15 by screwing a holder 18 formed integrally with the ferrite 17. A housing recess 20 is formed on the outer bottom surface at the center of the protection frame 13.

As shown in FIG. 2, a relief hole 21 is formed in the center of the bottom surface of the housing recess 20, and a locking hole 22 is formed in the outer peripheral portion along the circumferential direction. Escape hole 21
Has a size that allows the rotation preventing protrusion 16 and a protrusion 28 described later to be disposed. The locking hole 22 has an insertion hole 22a through which a claw 27a of a leg 27 described later can be inserted.
And a locking hole 22b narrower than the insertion hole 22a. On the outer peripheral side of the locking hole 22b, a locking recess 22c for locking the claw 27a is formed.

A temperature detecting sensor 23 is provided in the housing recess 20. As shown in FIG. 4, the temperature detection sensor 23 includes an element section 24, a cover section 25, and a spring 26. The element section 24 includes, for example,
A thermistor is used. The cover part 25 has a cylindrical shape with a bottom, and the element part 24 is disposed inside the cover part 25. Further, a pair of leg portions 27 and a pair of projecting portions 28 are provided at the opening edges of the cover portion 25 at opposite positions.
At the tip of each leg 27, a claw 27a extends outward. Further, a through hole 28a is formed in each of the projecting portions 28, and a cord 29 extending from the element portion 24 is inserted therethrough.

Next, a method of mounting the temperature detecting sensor 23 will be described.

First, the temperature detection sensor 23 is connected to the cover 2.
5, the element part 24 is inserted into the protruding part 2.
8 is drawn out from the through-hole 28a.

Then, the temperature detection sensor 23 is inserted into the housing recess 20 from inside the protection frame 13 so that the spring 26 is located between the ceiling surface of the cover 25 and the bottom surface of the housing recess 20.

Subsequently, the leg 27 formed on the cover 25
Is inserted through the insertion hole 22a of the locking hole 22 formed on the bottom surface of the accommodation recess 20. At this time, the protruding portion 28 of the cover portion 25 is located in the escape hole 21 of the accommodating concave portion 20, and the cord 29 extends below the protection frame 13 (see FIG. 3A).

Then, the temperature detection sensor 23 is further pushed in against the urging force of the spring 26, and the cover portion 25 is rotated with respect to the accommodation recess 20, so that the leg portion 27 is moved from the insertion hole portion 22a to the locking hole. Move to section 22b. Thereby, the claw portion 27a is locked in the locking recess 22c from the position where the insertion hole portion 22a is inserted. In this state, the lower end of the spring 26 is in contact with the inner surface of the housing recess 20, and the urging force acts on the cover 25. Therefore, a desired locked state that does not fall off due to vibration or the like is formed between the claw portion 27a and the locking recess 22c. In addition, the rotation of the cover 25 causes the protrusion 28
Moves in the escape hole 21.

Subsequently, an induction heating coil 19 is attached to the protective frame 13 by screwing a holder 18 integrally formed with the ferrite 17. During this time, the temperature detection sensor 23 detects that the claw 27a of the cover 25 is
Since the locking recess 22c depressed from the bottom surface of the locking member 22 is locked by applying the urging force of the spring 26, the locking recess 22c does not fall off due to vibration or the like.

Thereafter, the bottom portion 11b is attached to the rice cooker main body 11. By mounting the bottom portion 11b, the rotation preventing protrusion 16 formed on the bottom portion 11b is positioned in the escape hole 21 formed in the accommodation recess 20 (see FIG. 3B). This allows
Projection 28 of cover 25 already located in escape hole 21
Is blocked from moving. That is, the temperature detection sensor 23 is positioned so as to be unable to rotate with respect to the accommodation recess 20, and the temperature detection sensor 23 does not fall off.

In the above-described embodiment, the rotation preventing protrusion 16 formed on the bottom 11b is brought into contact with the protrusion 28 to prevent the temperature detection sensor 23 from dropping off. However, as shown in FIG. Is also good. That is, the center hole 20 a and the locking hole 22 are formed in the accommodation recess 20. A pair of legs 27 are formed on the cover portion 25 of the temperature detection sensor 23 at opposing positions on the outer periphery, and a projecting portion 28 is formed at the center. Then, the rotation preventing protrusion 16 of the bottom 11b is connected to the leg 27.
To prevent the temperature detection sensor 23 from dropping off.

In the above embodiment, the leg 27 and the projection 28 are provided separately from the cover 25. However, as shown in FIG. 6, both may be provided integrally. Good. In this case, the receiving recess 20 is provided with the locking hole 2.
Only two holes need be formed, and the escape hole 21 is not required.
Thereby, the strength of the accommodation recess 20 can be increased,
The configuration of the cover 25 can be simplified.

Further, in the above-described embodiment, the structure in which the cover portion 25 is attached by rotating the cover portion is adopted, but the structure may be as shown in FIG. That is, the leg 27 is configured to be elastically deformable. Further, the locking hole 22 is an opening having an inner edge over which the claw portion 27a can ride over when the leg portion 27 is elastically deformed. In addition, the rotation preventing projection 16 formed on the bottom 11b is provided.
When the bottom 11b is attached to the body 11a,
7 to prevent its deformation.

[0029]

As is apparent from the above description, according to the sensor mounting structure of the rice cooker according to the present invention, the locking portion formed on the temperature detecting sensor is replaced by the locking formed on the accommodation chamber of the rice cooker main body. Since the temperature detection sensor can be mounted by locking to the receiving part, the mounting screws, which were required in the past, are no longer required, and the number of parts is reduced, workability is improved, and costs are suppressed. it can.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rice cooker provided with a sensor mounting structure according to the present invention.

FIG. 2 is a bottom view of the protection frame shown in FIG.

3A and 3B are bottom views showing the housing recess of FIG. 2, wherein FIG. 3A shows a state before the bottom is assembled and FIG. 3B shows a state after the bottom is assembled.

FIG. 4A is a front view of the temperature detection sensor of FIG. 1,
(B) is a bottom view thereof.

FIG. 5 is a bottom view of a housing recess according to another embodiment,
(A) is a state before the bottom is assembled, and (b) is a state after the assembly.

FIG. 6 is a bottom view of a housing recess according to another embodiment,
(A) is a state before the bottom is assembled, and (b) is a state after the assembly.

FIG. 7 shows a sensor mounting structure according to another embodiment,
(A) is an exploded front view, (b) is an assembly front view.

8A and 8B are a plan view and a partial cross-sectional front view of a temperature detection sensor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Storage chamber 15 Inner pan 20 Storage recess 22c Locking recess 23 Temperature detection sensor 24 Element part 25 Cover part 26 Spring 27 Leg 27a Claw part (locking part)

Claims (6)

[Claims] 1. A rice cooker which is formed on a bottom wall of a storage chamber in a rice cooker main body, and which can be attached with a temperature detection sensor which abuts on a bottom surface of an inner pot stored in the storage chamber and detects the temperature thereof. In the sensor mounting structure, the bottom wall of the storage chamber has a storage recess provided with the temperature detection sensor and a lock receiving portion, and the temperature detection sensor has an element portion and an element portion. A cover part that is integrally mounted and has a locking part that is locked by the locking receiving part, and is disposed between the cover part and the housing recess;
A sensor mounting structure for a rice cooker, comprising: urging means for urging the cover portion so as to contact the bottom surface of the inner pot. 2. The locking portion comprises a plurality of protruding portions each having a claw portion at a tip, and the locking receiving portion is continuous with an insertion hole portion through which the claw portion is inserted, and the insertion hole portion. The sensor mounting structure for a rice cooker according to claim 1, further comprising: a locking hole formed so that the claw portion is locked to an edge. 3. A locking recess for preventing the claw portion from returning backward is formed at an edge of the locking hole.
The sensor mounting structure of the rice cooker according to the above. 4. The storage chamber is formed by a body and a protection frame, and the protection frame is formed after a claw of the locking portion is locked to an edge of a locking hole of the storage chamber. The sensor mounting structure for a rice cooker according to claim 2 or 3, further comprising a reversing prevention piece assembled to the rice cooker to prevent the locking portion from reversing. 5. The sensor mounting structure for a rice cooker according to claim 1, wherein the locking portion also serves as a guide for a cord connected to the element portion. 6. The locking portion includes a plurality of elastic protrusions having claw portions protruding outward, and the locking receiving portion includes an opening having an inner edge where the claw portion is locked. The storage chamber is formed by a body and a protection frame, and the protection frame is assembled to the body after the claw of the locking portion is locked to the inner edge of the opening of the locking receiving portion. 2. The sensor mounting structure for a rice cooker according to claim 1, further comprising a deformation preventing portion for preventing an elastic deformation of the elastic protrusion to the inside.