JPH0953994A - Temperature sensor for cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a temperature sensor excellent in insulation which can be assembled easily by building in a movable body case and a supporting member by a side face protrusion provided on a holder and a side face recess made in the movable body case. SOLUTION: After a terminal 8 is press-fitted to a holder 4 and lead wires 9a, 9b are spot-welded to the terminal 8, the lead wires 9a, 9b are hooked to the stop part 16 of holder 4 and led out through a hole. A thermistor 5 is protected by a protective tube 7 made of a good thermal conductor material and built in the holder 4 before the lead wires 9a, 9b are spot-welded to the terminal 8. Upper end part of the holder 4 is then fitted in then fitted in the recess at the upper end of movable body case 19 so that the protrusion 17 of holder 4 is fitted in the recess 18 of movable body case 19 thus encasing the supporting member 2 in the movable body case 19, and covered by a cover 3. Finally, the side edge of cover 3 is caulked thus securing the holder 4 in the movable body case 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker, a rice cooker, and an outer frame which are composed of an outer pot and an inner pot which can be attached to and detached from the outer pot. The present invention relates to a temperature sensor for a cooker that detects the temperature of an inner pot, which is a heated object such as an electromagnetic induction heating type rice cooker including a pot.

[0002]

2. Description of the Related Art An example of a conventional temperature sensor for a cooking device is shown in FIG.
Shown in As shown in FIG. 2, the heat sensitive body is composed of the movable body 1. The terminal 8 is press-fitted or inserted into the holder 4 and then fixed with an adhesive. After the lead wire 9 is spot-welded to the terminal 8, the lead wire 9 is hooked on the locking portion 14 of the holder 4 and guided to the outside through the hole 15.
Further, the holder 4 incorporates a thermistor 5 as a temperature sensitive element and a reed switch 6. The thermistor 5 is protected by a protection tube 7 made of a heat conductive material. The lead 5 a of the thermistor 5 is spot-welded to the terminal 8. Reed 6 of reed switch 6
In order to relieve the stress on the reed switch and to reduce the space, a is bent upward (in the direction in which the lid 3 is present) and spot-welded to the terminal 8. The movable body 1 is fixed by caulking the side edges of the support member 2 and the lid 3 incorporated in this way. The mounting holder 13 includes the magnet 12. The movable body 1 described above is the spring 1
It is supported by a mounting holder 13 via 1 so as to be vertically movable. Now, when an inner pot is not placed as a heated object on this temperature sensor and the movable body 1 is in the raised position, the magnetic flux from the magnet 12 flows into the reed switch 6, and the reed switch 6 is closed. Become.

FIG. 3 is a schematic structural diagram of an example of an electromagnetic induction heating type microcomputer rice cooker, and FIG. 4 is a circuit diagram thereof.

As shown in FIG. 4, since the temperature detection signal line from the thermistor 5 and the detection signal line from the reed switch 8 indicating the presence or absence of the inner pot 21 are connected in parallel, the reed switch 6 is connected as described above. When is closed, the resistance value of the detection signal of the temperature sensor is always 0Ω regardless of the resistance value (temperature detection signal) of the thermistor. Therefore, when there is no inner pot, the operation of the control circuit is stopped and the coil 22 is de-energized. Next, when the inner pot 21 is placed on the movable body 1, the reed switch separates from the magnet 12 as the movable body 1 descends, so that the magnetic flux from the magnet 12 flowing into the reed switch 6 sharply decreases. Then, the reed switch 6 is in the open state.

As described above, when the reed switch 6 is in the open state, the resistance value of the thermistor 5 is sent to the control circuit as a temperature detection signal to control the energization of the coil 22.

The movable body 1 is previously provided with a thermistor 5
Is fixed by the holder 4, and the thermistor 5
Can detect the temperature of the lid 3, that is, the temperature of the object to be heated.

[0007]

As shown in FIG. 2, in the conventional temperature sensor for a cooker, since the current-carrying portion including the spot welded portion of the terminal 8 is exposed, the insulation with the spring 11 and the lid 3 are provided. If water falls from the upper part of the, there is a problem such as flowing into the current-carrying part.

An object of the present invention is to provide a temperature sensor for a cooker which is excellent in insulation and easy to assemble.

[0009]

According to the present invention, a movable body is a support member composed of a holder having a detection element, a temperature sensitive element, and a terminal, a movable body case for accommodating the same, and A movable body case and a lid that is caulked to the upper surface of the movable body case; an upper end portion of a holder constituting the support member is disposed in an upper end surface concave portion of the movable body case; and the support member is housed in the movable body case. Since the case and the supporting member are assembled by the side surface convex portion provided on the holder and the concave portion provided on the movable body case, it is possible to obtain the temperature sensor for the cooker ensuring the insulation.

[0010]

1 shows a temperature sensor according to an embodiment of the present invention. As shown in FIG. 1, the holder 8 has terminals 8
Is press-fitted and fixed, and the lead wires 9a and 9b are spot-welded to the terminal 8, then hooked by the locking portion 16 of the holder 4 and guided to the outside through the hole. Thermistor 5
Are protected by a protective tube made of a material 7 having good thermal conductivity. Further, the thermistor leads 5a and 5b incorporated in the holder 4 are spot-welded to the terminals 8. The lead 6a of the reed switch 6 is spot welded to the terminal 8 with its tip bent upward. Next, the upper end of the holder 4 is fitted into the upper surface recess of the movable body case 19 so that the convex portion 17 of the holder 4 and the concave portion 18 of the movable body case 19 are aligned with each other, and the support member 2 is attached to the movable body case 19. It is stored inside and covered with a lid 3. The holder 4 is fixed in the movable body case 19 by caulking the side edge of the lid 3. The mounting holder 13 has a magnet 12
It has. The movable body case 19 is supported by the mounting holder 13 so as to be vertically movable via the spring 11 on the outer peripheral portion. The mechanism for detecting the presence or absence of the inner pot of this temperature sensor is the same as the conventional example.

[0011]

As described above, according to the present invention, since the spot welded portion is provided inside the movable body case, insulation can be ensured, and the convex portion provided on the holder and the movable body case are provided. It is possible to provide a temperature sensor for a cooker that can be easily positioned by positioning with the recessed portion.

[Brief description of drawings]

FIG. 1 is an assembly structure diagram according to the present invention.

FIG. 2 is an assembly structure diagram of a conventional product.

FIG. 3 is a structural diagram of an electromagnetic induction heating type microcomputer rice cooker.

FIG. 4 is a circuit diagram of an electromagnetic induction heating type microcomputer rice cooker.

[Explanation of symbols]

 1 Movable body 2 Support member 3 Lid 4 Holder 5, 5a, 5b Thermistor (temperature sensitive element) 6 Reed switch 7 Protective tube 8 Terminal 9, 9a, 9b, 9c Lead wire 10 Holder claw 11 Spring 12 Magnet 13 Mounting holder 14 Lead Wire locking portion 15 Lead wire hole 16 Lead wire locking portion 17 Convex portion 18 Recessed portion 19 Movable body case 20 Temperature sensor 21 Inner pot 22 Coil

Claims (3)

[Claims] 1. When a movable body is moved by mounting the body to be heated, the presence or absence of the body to be heated is detected by a detection element provided on the movable body, and the temperature of the body to be heated is controlled by the upper part of the body. In a temperature sensor for a cooking device for detecting by a temperature-sensitive element inside a temperature-sensitive body provided in the movable body, the movable body includes a support member formed of a holder including the detection element, the temperature-sensitive element, and a terminal, and the support member is housed therein. A temperature sensor for a cooker, comprising a movable body case and a lid crimped on the upper surface of the movable body case. 2. The cooker temperature according to claim 1, wherein an upper end of the holder constituting the support member is arranged in a recess of an upper end surface of the movable body case, and the support member is housed in the movable body case. Sensor. 3. The temperature sensor for a cooker according to claim 1, wherein the movable body case and the support member are incorporated by a side surface convex portion provided on the holder and a concave portion provided on the movable body case.