JPH0574361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat-sensitive device for sensing the temperature of a pot such as a rice cooker.

Conventional technology A conventional heat-sensitive device of this type is, for example,
As shown in Japanese Patent No. 7210, the structure was as shown in FIGS. 6 and 7.

That is, a hole 3 through which the lead wire 2 of the heat-sensitive element 1 is inserted is provided in the lower heat-sensitive member 4, and the lead wire 2 is guided into the inner case 5 through the hole 3.

Problems to be Solved by the Invention However, with such a structure, when assembling a heat-sensitive device, the lead wire 2 of the heat-sensitive element 1 is
It is necessary to pass through the hole 3 of the lower heat-sensitive member 4, so
It was extremely difficult to assemble.

When the connecting terminal crimped onto the tip of the lead wire 2 is inserted into the hole 3, the connecting terminal sometimes hits the edge of the hole 3 and becomes deformed. In order to avoid this deformation, it is necessary to provide a large hole for passing the housing through the lower heat-sensitive member 4 after setting the connection terminal in the housing.
As a result, the heat-sensitive element 1 becomes susceptible to the influence of the outside air temperature, etc., resulting in the problem that the temperature of the pot cannot be accurately sensed.

The present invention solves these problems,
The object of the present invention is to provide a heat-sensitive device that is easy to assemble and can accurately sense the temperature of a pot.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a recess for the lead wire of the heat-sensitive element in the lower heat-sensitive member, and extends the lead wire of the heat-sensitive element along the outer periphery of the lower heat-sensitive member. A notch is formed to allow the

Effect According to the above configuration, the notch is formed on the outer periphery of the lower heat-sensitive member, so that when assembling the heat-sensitive device, the lead wire of the heat-sensitive element is routed from the outer periphery of the lower heat-sensitive member. Set it and
It can be guided inside the inner case.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In Fig. 5, 21 is a cylindrical rice cooker body;
A lid 22 that can be opened and closed is provided at the top opening of the main body 21.
is provided. A heating element 23 is fixed to the inner bottom of the main body 21, and has a through hole 23a in the center thereof. 24 is a pot that is detachably placed on the heating element 23. 25 is in close contact with the bottom of the pot 24 and the pot 2
It is a heat-sensitive device that senses the temperature of 4.

26 is a printed circuit board, this printed circuit board 26
is fixed to a lower frame 27 fixed to the lower part of the main body 21, and a lead wire 28 from the thermal device is connected to this printed circuit board 29 by a connector 29.

Next, the structure of the thermal device 25 will be explained with reference to FIGS. 1 to 4. 30 is an outer case fixed to the central through hole 23a of the heating element 23, and 31 is housed in this outer case 30, and the coil spring 3 is
2, the inner case 33 is an upper heat-sensitive member with good thermal conductivity that closes the opening of the inner case 31 and is in direct contact with the pot 24. 34 is a heat-sensitive element located below the upper heat-sensitive member 33, and this heat-sensitive element 34 is inserted into an electrically insulating tube 35. Reference numeral 36 denotes a rubber buffer member located below the heat-sensitive element 34 to buffer mechanical force during assembly. Reference numeral 37 denotes a lower heat-sensitive member with good thermal conductivity, and the outer peripheral end of the lower heat-sensitive member 37 is placed on the upper opening edge of the inner case 31 and is connected to the outer peripheral end of the upper heat-sensitive member 33. . The lower heat-sensitive member 37 has a heat-sensitive element 3
A recess 43 is provided to allow the lead wire of No. 4 to pass through.
Further, on the outer periphery of the lower heat-sensitive member 37, there is a cut-and-raised portion 3 for regulating the position in the radial direction with respect to the inner case 31.
8 and a notch 40 through which the lead wire 39 of the heat-sensitive element 34 passes.

With the above configuration, when assembling the heat-sensitive device, the lead wires 39 of the heat-sensitive element 34 do not need to be inserted through the lower heat-sensitive member 37, and the lead wires 39 can be aligned in the notch 40 from the lateral direction. The lead wire 39 can be guided inside the inner case 31.

Furthermore, as shown in FIG. 4, even when the connecting terminal 41 is caulked and fixed to the tip of the lead wire 39 and the connecting terminal 41 is set in one housing 42, it is assembled into a heat-sensitive device. The lead wire 39 can be easily set in the lower heat-sensitive member 37, and as a result, there is no need to provide a hole in the lower heat-sensitive member 37 through which the housing 42 passes, so that the heat-sensitive element 34 is less susceptible to the influence of outside temperature.

Furthermore, in order to pass the lead wire 39 through the hole, it is necessary to provide a clearance between the diameter of the hole and the diameter of the lead wire 39, but in this embodiment, the lead wire 39 is inserted into the notch 40. Since the notch width A is smaller than the outer diameter 0B of the electrically insulating tube 35, it can be set. It can accurately sense 24 temperatures.

Effects of the Invention As described above, according to the present invention, since the notch is formed on the outer periphery of the lower heat-sensitive member to allow the lead wire of the heat-sensitive element to run along, when assembling the heat-sensitive device,
The lead wire of the heat-sensitive element can be set from the outer periphery of the lower heat-sensitive member and guided inside the inner case.
As a result, the ease of assembly is very good, and there is no need to provide a large hole in the lower heat-sensitive member for passing the housing through which the connection terminal of the lead wire is set, unlike in the past. This makes it possible to accurately sense the temperature of the pot.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a heat-sensitive device showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the heat-sensitive device, FIG. 3 is a plan view of the lower heat-sensitive member of the heat-sensitive device, and FIG. 4 is the same. A perspective view showing a state in which the lead wire of the thermal element is set in the housing, Fig. 5 is a cutaway side view of a rice cooker that employs the thermal element, Fig. 6 is a sectional view of a conventional thermal device, and Fig. 7 is the same. FIG. 3 is an exploded perspective view of the thermal device. 23... heating element, 24... pot, 25... heat sensitive device, 33... upper heat sensitive member, 34... heat sensitive element,
35... Electrical insulating tube, 37... Lower heat-sensitive member, 39... Lead wire, 40... Notch portion.

Claims (1)

[Claims] 1. A sensing device that protrudes from and retracts from a heating element and is in contact with a pot that is removably placed on the heating element to sense the temperature of the pot, which includes a lower heat-sensitive member, a heat-sensitive element covered with an electrical insulator, and an upper part. The heat-sensitive members are sequentially stacked, a recess is provided in the lower heat-sensitive member for passing a lead wire of a heat-sensitive element, and an outer peripheral end of the lower heat-sensitive member and an outer peripheral end of the upper heat-sensitive member are joined;
A heat-sensitive device characterized in that a cutout portion is formed on the outer periphery of the lower heat-sensitive member to allow a lead wire of a heat-sensitive element to run along the outer periphery.