JPS63160621A - Heat-sensitive apparatus of electric cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a heat-sensitive device for controlling the temperature of an electric cooker such as a jar rice cooker that is used on a daily basis in a general household kitchen.

2. Description of the Related Art Conventionally, a jar rice cooker, which is an example of this type of electric cooker, has a structure as shown in FIG. That is, the main body (outer shell) has a double structure by connecting the upper ends of an outer cylindrical body 51 with a bottom and an inner cylindrical protection frame 52 with a bottom through an annular upper frame 53. It is composed of: The protective frame 5
A disk-shaped heating device 54 is provided horizontally on the bottom plate of the device 2, and this heating device 54 has a heating element 55. #! Cooking rice is performed on the upper part of the heating device 54! 56 is removably mounted. Also, in the center of the heating device 54 is a heat-sensitive device that detects the bottom temperature of the pot! 157 is provided, and a heat-retaining heater 58 is provided on the outer surface of the protective frame 52. The opening of the mJ copper pot 56 is covered by a double structure of an inner lid 59 and an outer M60.

The outer M60 is attached to the main body via a hinge part 61 so as to be openable and closable, and a hook lever 63 having a hook button 62 is provided on the opposite side of the outer cover 60. A heat dissipation plate 65 in which a lid heater 64 is housed is provided above the inner lid 59, and an operating portion 66 and a water holder 67 are provided on the body 51. The internal structure of the heat-sensitive device 57 was as shown in FIG. That is, a contact plate 68 that extends over the bottom of the pot 56 and senses heat is provided, and a supply plate 68 is provided in the center of the inside of the contact plate 68.
The sensor 70 is placed through the holding plate 7.
It is fixed by 1.

A cylindrical case 7 with a bottom that covers the holding plate 71 etc. from below.
2, and the upper edge of the case 72 and the outer peripheral edge of the presser plate 71 are integrated by bending the outer part of the contact plate 68 downward and inward and locking it. The outer case 73 of the thermal device @57 is a cylinder with a bottom, and the upper edge is a heating device! 15
I'm adding deception υ to 4. The case 72 and the like are fitted into the outer case 73 from above, and the outer case 73
A coil spring 75 is provided between the bottom plate and the locking portion 74 of the contact plate 68 to urge the contact plate 68 to come into close contact with the pot 56. A stopper 76 is provided to prevent it from flying out. fnJn The lead wires 77 of the above-mentioned circuit board 70 are designed to run along the inner surface of the contact plate 68, but the connected wiring lead wires 78 are placed on the holding plate 7.
1, it is impossible to run it along for a long time, and it will be separated from the contact and exposed to the outside air.

Problems to be Solved by the Invention In such a conventional configuration, the temperature detection of the copper 56 is
6 reaches the sensor 70 via the contact plate 68 and the insulating plate 69. However, as the lead wire 77 is cooled by the outside air, heat is also taken away from the sensor 70, and the temperature of the sensor 70 becomes lower than the contact temperature, resulting in poor performance in detecting the temperature of the pot 56. Rarely. In addition, since the contact plate 68, presser plate 71, and case 72 are integrated by bending the outer peripheral part of the contact plate 68 downward and inward and locking it, this locking structure creates an edge. The structure made it impossible to downsize.

Therefore, a large mounting on the heating device 54 requires a hole 79. When heating the pot 56, the wider the heating area (contact area), the better the heat conduction and the higher the thermal efficiency.However, as mentioned above, if the hole 79 for mounting the heat-sensitive device 57 is large, the heat conduction will be poor, and the heat-sensitive device On the other hand, the attachment part of 57 is cooled down, and as a result, the problem often arises that cooking performance is often adversely affected to the extent that rice is not cooked evenly.

The present invention solves these problems by arranging the sensor lead wire without being affected by the outside air, accurately detecting the temperature at the bottom of the pot, and miniaturizing and installing the W&heating device. By making the holes smaller, the heating surface f of the heating device
The purpose is to provide a heat-sensitive device for an electric cooker that improves cooking performance by widening R<e gauze surface*> to improve heat conduction and uniform heating of the bottom of the pot.

Means for Solving the Problem In order to solve this problem, the present invention has a sensor case that transmits heat to the bottom of the pot and is formed in a way that the sensor case is folded down, and the sensor and the sensor lead wire are arranged on the inner surface of the sensor case. An inner case with a concave groove on the top and both sides for arranging these sensors and sensor lead wires is provided so as to fit closely inside the sensor case.
An elastic body is placed inside the sensor case to bring the sensor case into close contact with the bottom of the pot.

Function: According to this configuration, the sensor is in close contact with the center of the inner surface of the top plate of the sensor case, and the sensor lead wire is in close contact with the inner surface of the sensor case from the inner surface of the top plate to the outer circumferential inner surface of the sensor case, so that the temperature is the same as that of the sensor case. , the sensor lead wire is not affected by the outside air, and the sensor faithfully follows the temperature of the sensor case, which is in close contact with the pot and conducts heat.

In addition, the sensor case and the inner case can be integrated by bending a part of the lower end of the sensor case inward and locking it. By providing this, it is possible to realize a miniaturization of the g-thermal device, and the hole for attaching the heat-sensitive device formed in the heating device can be made smaller.

Examples Hereinafter, one example of the present invention will be described. Examples will be described with reference to FIGS. 1 to 4.

In Fig. 4, reference numeral 1 denotes a jar rice cooker which is an example of an electric cooker, and its main body (outer shell) consists of an outer cylindrical body 2 with a bottom and an inner cylindrical protection rod 3. By connecting the upper ends with an annular upper frame 4, it has a double structure. On the bottom plate of the protective frame 3, a disc-shaped heating device 5 formed of aluminum casting or the like is horizontally provided, and this heating device 5 has a heating element 6. The heating device 5
A pot 7 for cooking rice is removably placed on top of the rice cooker. Also, in the center of the heating device 5, there is a heat sensitive device 8 for detecting the bottom temperature of the pot.
A heat-retaining heater 9 is provided on the outer surface of the protective ring 3. The opening of the previous record 7 is the inner MIO and the outer lid 11.
It is covered by a double structure. The outer cover 11 is housed in the main body via a hinge part 12 so as to be openable and closable, and a hook lever 14 having a hook button 13 is provided on the opposite side of the outer cover 11. A heat dissipation plate 16 to which a buckwheat heater 15 is attached is provided above the inner lid 10, and an operating section 17 and a soup receiver 18 are provided on the body 2.

As shown in FIGS. 1 to 3, the heat-sensitive device 8 is mounted with a bottomed cylindrical outer case 21 formed in the center of the heating device 5 so as to face the hole 22 from below. 5 via a fixture 23, and a sensor case 24 containing the sensor is housed in the outer case 21 so as to be vertically movable. The sensor case 24 is formed into a cylindrical shape by drawing a metal plate. The inner case 25, which is fitted into the sensor case 24 from below and is placed on the inner surface, is also in the form of a cantilevered cylinder! 11, a concave groove portion 26 is formed over the top surface and both side surfaces thereof. A sensor 27 such as a thermistor for detecting heat at the center of the inner surface of the top plate of the sensor case 24 is embedded in the center of the top surface of the concave groove 26. sensor lead wire 2
8 are embedded in the concave groove portion 26 from the top surface side to the side surface side. Both sensor y-dore wires 28 are connected to wiring lead wires 30 via connectors 29 embedded in the recessed grooves 26, and both wiring lead wires 30 are bundled in the center with a protective tube 31. Later, outer case 2
1, is led out through the running opening 32, and is wired to the desk control circuit of the operating section 17, etc. The wiring lead wire 3o is made of, for example, a flexible insulated silicon glass braided electric wire with a core made of a thick copper wire. The sensor 27 is viewed with an insulating tube 33 such as a silicone tube that has good thermal conductivity, heat resistance, and good insulation in order to maintain insulation from metal. The inner case 25 can be made by drawing a metal plate or by resin molding, and can be made by bending and locking a plurality of claws 34 provided at the lower end of the sensor case 24 inward. It is integrated with the sensor case 24.

With this integration, the sensor 27 is brought into close contact with the inner surface of the top plate of the sensor case 24 via the edge tape 33. The upper surface of the top plate portion of the sensor case 24 is brought into close contact with the pot 7 for preparation of compost, and the #! ! In order to accurately detect the temperature of sensor case 7, a coil spring 35, which is an example of an elastic body, is provided between the inner lower end of sensor case 24 and outer case 21.

That is, at the lower end of the sensor case 24, the plate portion located between the claws 34 is bent inward at right angles, and a plurality of receivers form a plate 36, and these receivers connect the plate 36 and the outer case 21.
A carp μ spring 35 is disposed between the inner surface of the bottom plate and the inner surface of the bottom plate. From the lower end of the sensor case 24, the claw 34 and the plate 3
A plurality of (three) hanging plate parts 37 are arranged in a row between the outer case 21 and the hanging plate parts 37, which are placed opposite the outer case 21 and inserted into the nine through holes 38. A stopper 39 is formed by bending the notch at the lower end.

Therefore, by compressing the coil spring 35 and activating the stopper 39, the sensor case 24 is urged to protrude toward the upper end side.

The book is structured as above! 5i! The operation of the jar rice cooker 1 and the heat-sensitive device ft8 of the embodiment will be explained below. First, before setting the pot 7, the sensor case 24 of the heat sensitive device 8 is raised by the elastic force of the coil spring 350, as shown in FIG. The top plate portion of the heat sensitive device 8 is made to protrude upward relative to the heat sensitive device 8.

Next, when the pot 7 is placed in the protective ring 3, the bottom of the pot 7 is placed on the sensor case 24 on the top plate, and the sensor case 24 is lowered against the elastic force of the coil spring 35. This lowering is continued until the bottom of the pot 7 is placed on the heating device 5. By putting pot 7 in this way,
The top plate of the sensor case 24 is brought into close contact with the bottom of the copper 7 and pressed. Then, the lid is closed, the operation section 17 is operated to start cooking rice, and the sensor 27 detects the temperature of the bottom surface of the pot.

At that time, the temperature at the bottom of the pot is conducted to the sensor case 24,
The sensor 27 is brought into close contact with the center of the inner surface of the top plate of the sensor case 24, and the sensor case 24
The sensor lead [28
Since these sensors 27 and sensor lead wires 28 are in close contact with each other, these sensors 27 and sensor lead wires 28 have the same temperature as the sensor case 24.

In the above embodiment, the coil μ spring 35 is shown as the elastic body, but this may also be a plate spring or the like.

Effects of the Invention As described above, the present invention has a simple configuration in which the sensor and sensor lead wires are disposed within the concave groove formed across the top surface and both side surfaces of the inner case.
By placing the sensor and sensor lead wire in close contact with the sensor case, the sensor lead wire can be brought to the same temperature as the sensor case without being affected by the outside air. The temperature of the pot can be detected faithfully and accurately. In addition, the sensor case and the inner case can be integrated by bending a part of the lower end of the sensor case inward and locking it, and then using the locking part to place the elastic body inside the sensor case. By providing this, it is possible to downsize the heat-sensitive device. Due to this miniaturization, the hole formed in the heating device for attaching the heat-sensitive device can be made smaller, and therefore the heating area (contact area) for heating the pot can be widened to improve heat conduction and thermal efficiency. It can be done by This makes it possible to uniformize the heating heat supply to the pot, improve cooking performance, and reduce the cost of parts when used in an electric rice cooker, resulting in an 8-heat device that is highly mass-producible. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a heat-sensitive device used in a jar rice cooker showing an embodiment of the electric cooking device of the present invention, Fig. 2 is a partially cutaway bottom view of the same, and Fig. 3 is a perspective view of the inner case. , FIG. 4 is an overall vertical cross-sectional view of a jar rice cooker using the 18-heat device of the present invention, FIG. 5 is an overall vertical cross-sectional view of a jar rice cooker equipped with a conventional heat-sensitive device, and FIG. 6 is a conventional Longitudinal cross-sectional view of the 18 heat device of...
・Body, 3... Protective frame, 5... Heating device, 6...
・Heating element, 7...Side 8...j! 3 heat equipment, 17...
・Operation unit, 21...Outer case, 22...Mounting hole, 24...Sensor case, 25...Inner case,
26... Concave groove, 27... Sensor, 28...
Sensor lead wire, 29...Connector, 30...Wiring lead wire, 33...Insulation tube, 34...Claw, 3
5...Coil spring (elastic body), 36...Bracket is plate, 3
9...stopper. Agent Yoshihiro MorimotoFigure 1
. Figure 8 Figure 4 Figure 5 Figure 1

Claims (1)

[Claims] 1. An inner case in contact with the inner surface of the sensor case is provided in the sensor case in the form of a cylinder with a ceiling, a concave groove is formed across the top surface and both sides of the inner case, and the sensor and the sensor are placed in the concave groove. A heat-sensitive device for an electric cooker, in which a lead wire is provided and an elastic body is provided between the inner lower end of the sensor case and the outer case.