JPH0560415U - Temperature sensor for cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a temperature sensor for a cooker which realizes high safety without excessive heating of the cooker. [Configuration] Movable body 10 that moves by mounting the inner pot 70
A temperature for a cooker including a reed switch 30 that detects the presence or absence of the inner pot 70 based on the movement operation of the movable body 10, a thermistor 40 that detects the temperature of the inner pot 70, and a temperature fuse 90 that melts during abnormal heating. In the sensor, the reed switch 30, the thermistor 40 and the thermal fuse 9
0 is provided in the movable body 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooker temperature sensor for detecting the temperature of a heated object in a cooker such as a rice cooker. In general, a rice cooker has an outer pot and an inner pot which is detachable from the outer pot and is an object to be heated.

[0002]

[Prior Art]

 FIG. 3 is an exploded perspective view of a conventional temperature sensor for a cooker. In FIG. 3, the cooker temperature sensor includes a holder 11, an inner case 12, a lid 13, and an outer case 20. The terminal 111 is fixed to the holder 11 with an adhesive or the like after being press-fitted or inserted. After the lead wire 112 is spot-welded to the terminal 111, the lead wire 112 is hooked on the locking portion 113 of the holder 11 and led out to the outside through the hole 114. The holder 11 is further assembled with a reed switch 30 which is a position detecting element and a thermistor 40 which is a temperature sensing element. The thermistor 40 is covered and protected by a protection tube 42 made of an insulating high heat conductive material. The lead 41 of the thermistor 40 is spot-welded to the terminal 111. The lead 31 of the reed switch 30 is spot-welded to the terminal 111. The holder 11 is fixed in the inner case 12 by caulking the side edge of the lid 13. The movable body 10 is composed of the holder 11, the inner case 12, and the lid 13.

The outer case 20 also includes a support plate 21 and a magnet 22 attached to the support plate 21. The movable body 10 is supported in the outer case 20 so as to be vertically movable via a coil spring 50.

FIG. 4 is a structural diagram of a rice cooker using a conventional temperature sensor for a cooker. FIG. 6 is an electric circuit diagram of the rice cooker. The operation of the conventional temperature sensor for the cooking device will be described with reference to FIGS.

In FIG. 4, a conventional rice cooker includes an outer pot 60, an electric heating plate 80 provided on the bottom surface of the outer pot 60, and a cooking device temperature sensor (movable body) provided at the center of the electric heating plate 80. Only 10 and the outer case 20 are shown), and a temperature fuse 90 attached to the side surface of the outer pot 60. In the outer pot 60, the inner pot 70 that is the object to be heated is detachably housed. Incidentally, FIG. 4 shows a state in which the inner pot 70 is accommodated. Further, in FIG. 6, the electric circuit of the rice cooker is connected in parallel between the heating control unit 100 including a microcomputer for controlling the heating operation of the rice cooker and the temperature detection (input) terminal 101 of the heating control unit 100. The reed switch 30 and the thermistor 40 are connected to each other, and the heating plate 80, the temperature fuse 90, and the power source 200 are connected in series between the heating plate drive (output) terminals 102 of the heating controller 100.

Although not shown in FIG. 4, the movable body 10 of the temperature sensor for the cooker is in the raised position when the inner pot 70 is not housed in the outer pot 60. At this time, the magnetic flux from the magnet 22 flows into the reed switch 30, and the reed switch 30 is closed. Here, in FIG. 6, when the reed switch 30 is in the closed state, the resistance value between the temperature detection terminals 101 of the heating control unit 100 is always 0. Based on this, the heating control unit 100 cuts off the power supply to the electric heating plate 80. On the other hand, in FIG. 4, when the inner pot 70 is housed in the outer pot 60, the movable body 10 of the cooking device temperature sensor is in the lowered position. At this time, since the magnet 22 separates from the magnet 22, the magnetic flux flowing from the magnet 22 decreases to a predetermined value or less, and the reed switch 30 enters the open state. In FIG. 6 again, the resistance value between the temperature detection terminals 101, that is, the resistance value of the thermistor 40 is detected by the heating control unit 100, and the heating control unit 100 controls the energization of the heating plate 80. The thermistor 40 detects the temperature of the inner pot 70, which is the object to be heated, via the lid 13 in the movable body 10 and the protective tube 42.

By the way, the temperature fuse 90 is a safety means for preventing an abnormal overheated state due to an abnormal operation of the heating control unit 100, and when the electric heating plate 80 is abnormally heated, it is blown out and the heating circuit of the rice cooker is cut off. It shuts off.

[0008]

[Problems to be solved by the device]

 However, as described above, in the conventional rice cooker, the temperature fuse 90 is mounted separately from the electric heating plate 80, and when the heating control unit 100 malfunctions, there is a delay before the temperature fuse 90 melts. May occur. In this case, the rice cooker is overheated, which may damage the rice cooker or cause a fire.

An object of the present invention is to provide a cooking device temperature sensor that realizes high safety without excessive heating of the cooking device.

[0010]

[Means for Solving the Problems]

 According to the present invention, the movable body that moves by mounting the heated body, the position detection element that detects the presence or absence of the heated body based on the movement operation of the movable body, and the temperature of the heated body are detected. In a cooking device temperature sensor having a temperature-sensitive element for detecting and a temperature fuse that is blown when abnormal heating occurs, the position detection element, the temperature-sensitive element and the temperature fuse are provided in the movable body. The temperature sensor for the cooker can be obtained.

According to the present invention, the position detecting element and the temperature fuse each have a cylindrical shape, and the cylinder axis is parallel to the moving direction of the movable body. The above-mentioned temperature sensor for a cooker provided in the above can be obtained.

That is, the temperature sensor for a cooking device according to the present invention is provided with a temperature fuse on a movable body which is vertically movable near an electric heating plate which becomes high temperature, and when an abnormal heating state occurs, the temperature is instantly increased. It is characterized by blown fuses.

[0013]

【Example】

 Hereinafter, a temperature sensor for a cooker according to an embodiment of the present invention will be described with reference to the drawings.

1 and 2 are an exploded perspective view and a perspective view showing an essential part of a temperature sensor for a cooker according to an embodiment of the present invention. In both figures, the same parts as those in the conventional example are designated by the same reference numerals. In FIG. 1, the temperature sensor for a cooker according to this embodiment includes a holder 11, an inner case 12, a lid 13, and an outer case 20. The holder 11 is made of, for example, a heat-resistant resin, and has a disk portion 14 on the upper portion and cylindrical portions 15 and 16 on the lower portion. The disc portion 14 is provided with a recess 141 for fixing the thermistor. Referring also to FIG. 2, in the inside of the cylindrical portion 15, the thermal fuse 90 is crimp-connected to the lead portions at both ends of the thermal fuse 90 by connectors, and a protective tube 91 made of an insulating high thermal conductive material is used. It is attached in the axial direction of the cylinder in a covered state (shown by a solid line for convenience). In addition, a state in which the lead wire 161, the reed switch 30, the thermistor 40, and the lead wire 161 are crimp-connected by a connector to the inner portions of the disk portion 14 and the cylindrical portion 16 and covered by the protective tube insulation 42 (for convenience, It is attached with a solid line). The thermistor 40 is attached to the concave portion 141 of the disc portion 14, and the reed switch 30 is attached to the cylindrical portion 16 in the axial direction.

Again, in FIG. 1, the holder 11 is fixed in the inner case 12 by caulking the side edge of the lid 13. The movable body 10 is composed of the holder 11, the inner case 12, and the lid 13. The outer case 20 also includes two support cylinders 21 and a magnet 22 attached to the support cylinder 21. The movable body 10 is supported in the outer case 20 so as to be vertically movable via a coil spring 50.

Although not shown, the temperature sensor for a cooker configured as described above includes a rice cooker having an outer pot and an electric heating plate provided on the bottom surface of the outer pot, as in the conventional example. Prepared in the central part of the. The inner pot, which is the object to be heated, is detachably accommodated in the outer pot.

FIG. 5 is an electric circuit diagram of a rice cooker using the temperature sensor for a cooker according to this embodiment. In FIG. 5, the electric circuit of the rice cooker is connected in series between the heating control unit 100 including a microcomputer for controlling the heating operation of the rice cooker and the temperature detection (input) terminal 101 of the heating control unit 100. The reed switch 30 and the thermistor 40 are provided with an electric heating plate 80, a thermal fuse 90, and a power supply 200 that are connected in series between the electric heating plate drive (output) terminals 102 of the heating control unit 100.

Next, the operation of the temperature sensor for the cooking device according to the present embodiment will be described with reference to FIG. When the inner pot is not accommodated in the outer pot, the movable body 10 of the cooking device temperature sensor is in the raised position. At this time, the magnetic flux from the magnet 22 flows into the reed switch 30, the reed switch 30 is opened, and the resistance value between the temperature detection terminals 101 of the heating control unit 100 is zero. Based on this, the heating control unit 100 cuts off the power supply to the electric heating plate 80. On the other hand, when the inner pot is accommodated in the outer pot, the movable body 10 of the temperature sensor for the cooking device is in the lowered position. At this time, since the magnet 22 is separated from the magnet 22, the magnetic flux flowing from the magnet 22 is reduced to a predetermined value or less, the reed switch 30 is closed, and the resistance value between the temperature detection terminals 101, that is, the resistance value of the thermistor 40 is Detected by the heating control unit 100, the heating control unit 100 controls energization of the heating plate 80.

Further, since the thermal fuse 90 is provided in the movable body 10 as described above, it is located in the vicinity of the heating plate having the highest temperature. Thereby, when the electric heating plate is abnormally heated due to an abnormal operation of the heating control unit 100, the heating circuit of the rice cooker can be cut off by melting.

[0020]

[Effect of the device]

 The temperature sensor for a cooking device according to the present invention is provided with a position detecting element, a temperature sensing element, and a temperature fuse in a movable body located in the vicinity of an object to be heated which has a relatively high temperature. Since the thermal fuse is blown immediately, the cooker is not overheated and high safety can be realized.

Further, since the cylindrical reed switch and the thermal fuse are arranged with respect to the movable body in such a manner that the cylindrical axis is parallel to the moving direction of the movable body, the size can be greatly reduced compared with the conventional one, and the electrothermal heat can be reduced. The surface area of a heating element such as a plate can be increased, and the thermal efficiency of the cooker can be improved.

Furthermore, after the thermal fuse is blown, it can be easily replaced and maintained, which is convenient in actual use.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a temperature sensor for a cooker according to an embodiment of the present invention.

2 is a perspective view showing a main part of the temperature sensor for a cooking device shown in FIG. 1. FIG.

FIG. 3 is an exploded perspective view of a conventional temperature sensor for a cooker.

FIG. 4 is a structural diagram of a rice cooker.

5 is an electric circuit diagram of a rice cooker in which the temperature sensor for a cooker shown in FIG. 1 is used.

FIG. 6 is an electric circuit diagram of a conventional rice cooker.

[Explanation of symbols]

 10 Movable body 11 Holder 12 Inner case 13 Lid 20 Outer case 22 Magnet 30 Reed switch 40 Thermistor 42 Protective tube 50 Coil spring 60 Outer pot 70 Inner pot 80 Electric heating plate 90 Thermal fuse 91 Protective tube 100 Heating control section

Claims (2)

[Scope of utility model registration request] 1. A movable body that moves by mounting a heated body, a position detection element that detects the presence or absence of the heated body based on the moving operation of the movable body, and a sense that detects the temperature of the heated body. In a temperature sensor for a cooker having a temperature element and a temperature fuse that melts during abnormal heating, the position detecting element, the temperature sensitive element, and the temperature fuse are provided in the movable body. Sensor. 2. The position detecting element and the thermal fuse each have a cylindrical shape, and a cylinder axis is provided in the movable body parallel to a moving direction of the movable body. Temperature sensor for cooking device.