JPH0252773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric range that controls the temperature by detecting the temperature of the copper bottom.

Conventional Structure and Its Problems The temperature detection structure of a conventional electric range will be explained with reference to FIGS. 1 and 2, and its problems will be described. Figure 1 shows the temperature detection configuration of a conventional electric range. A shaped heater 4 is provided to constitute a heating section. A sensor support fitting 5 is spot-welded to the support fitting 3 and holds a temperature sensor 6, and a lead wire case 7 is spot-welded to the lower part of the temperature sensor 6. The hole 8 in the center of the saucer 2 is an air vent hole, and is used to form an air flow that transfers the heat of the heater 4 upward. Similarly, the notch 9 is for draining water that has boiled over into the saucer 2, and the water from the saucer 2 is received by the inner tray 11, which is positioned and placed on the bottom plate 10 of the electric range main body. ing. When the pot 12 is placed on the heating section of this electric range, the heater 4
The temperature sensor 6 that slides up and down sinks and is pressed against the bottom of the pot 12 by the unique spring pressure of the temperature sensor 6, thereby detecting the temperature of the bottom of the pot 12. ing. The temperature detected here is transmitted as an electric signal to a control circuit section (not shown) through the lead wire case 7.

Next, the configuration of this temperature sensor 6 section will be explained using FIG. 2. The sensor cap 13 is on the top and the pot 12
In addition to detecting the temperature at the bottom of the tank, it also serves to guard against boiling over from the top. In order to sense the temperature of this sensor cap 13, an aluminum holder 14 with good thermal conductivity is pressed against it, and the temperature is transmitted to a temperature sensing element 15 consisting of a thermistor welded to a glass ceramic support base. The temperature sensing element 15 is urged upward by a disc spring 16, and this disc spring 16 is held by a retaining ring 17, which is further attached to the middle cylinder 1.
8 together with the sensor cap 13 and the outer edge 13a.
It is tightened with. The inner cylinder 18 partially passes through the outer cylinder 19, and forms a bent part 20 at the lower end of this penetration,
Restricts upward movement. In addition, the retaining ring 1
A spring receiver 21 is pressed into contact with the lower part of the sensor cap 7, and a coil spring 22 urges the entire sensor cap 13 upwardly so that the sensor cap 13 can slide up and down. The lead wire 23 coming out from the temperature sensing element 15 is insulated by a plurality of insulators 24 and guided to the lead wire case 7 in a gently curved shape. This lead wire 23 is configured to bend as the sensor cap 13 slides up and down.

In the temperature detection configuration of the electric range described above, conductive heat and radiant heat from the heater 4 have a large influence. First, in order to avoid the influence of conductive heat, the sensor support fitting 5 must be attached from the outer edge of the support fitting 3, which complicates the structure. Also, due to conductive heat and radiant heat, the insulator 24 of the lead wire 23 in Fig. 2
The insulated bend is exposed to high temperatures of 200-300℃. For this reason, the lead wire 23 is easily broken, resulting in a lack of reliability. Furthermore, since the inner tube 20 and retaining ring 17 are also heated, in order to more accurately detect the bottom temperature of the pot 12, it is necessary to thermally bond the sensor cap 13 and the temperature sensing element 15 strongly.
4 is required. Thermal reactivity deteriorates due to the heat capacity of the aluminum holder 14 and the like. Therefore, the three major problems of the conventional configuration are that the configuration is complicated, the reliability is low, and the responsiveness is poor.

OBJECTS OF THE INVENTION An object of the present invention is to provide an electric range that uses an infrared sensor and solves the above problems.

Structure of the Invention In order to achieve the above object, the electric range of the present invention includes: a heater for heating a container such as a pot; a heat-sensitive cylinder configured to slide up and down with respect to the heater and to block radiant heat; A heat ray source provided on the back surface of this heat-sensitive cylinder, a heat ray reflecting mirror provided below this heat ray source,
and an infrared sensor provided in a position where the heat ray reflecting mirror is placed in a viewing angle and thermally distant from the heater, and the temperature of the heat ray source of the heat sensitive cylinder is detected by the infrared sensor via the heat ray reflecting mirror. The infrared sensor measures the temperature at a location thermally distant from the heater, that is, at a relatively low temperature area, and performs temperature-voltage conversion, and the infrared sensor measures the temperature at a location thermally distant from the heater, that is, a relatively low temperature area, and performs temperature-voltage conversion. It has a simple configuration without electrical signal paths such as lead wires.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained as shown in FIGS. 3, 4, and 5.
This will be explained using figures. FIG. 3 shows the temperature detection configuration of the electric range of the present invention, and similarly to the conventional example shown in FIG. A spiral heater 4 is provided on the supporting metal fitting 3 held at the end of the heating section. A temperature detection support metal fitting 25 is spot-welded to the support metal fitting 3 and holds a temperature detection part 26. The hole 8 in the center of the saucer 2 is
It forms a conventional air vent and a path for infrared rays from the temperature detection section 26. Also, like the conventional example, the notch 9 is for draining water spilled onto the saucer 2, and the water from the saucer 2 is drained by the inner tray 11 placed at a fixed position on the bottom plate 10 of the electric range main body. Is receiving. Heat ray source 3 inside temperature detection unit 26
2 (FIG. 4) is reflected by a heat ray reflecting mirror 29 attached to a mirror stand 28 fixed to the bottom plate 10, and is also fixed to the bottom plate 10, where it is less affected by radiant heat etc. from the heater 4. The information is transmitted to the infrared sensor 30 provided in the. Here, temperature-voltage conversion is performed and transmitted as an electrical signal to a temperature control circuit (not shown). When the pot 12 is placed on the heater 4, the temperature detecting section 26, which can be slid up and down, is lowered, and the temperature detecting section 26 comes into pressure contact with the bottom surface of the pot 12 on the same upper surface as the heater 4. This configuration will be explained below using detailed diagrams of the temperature detection section 26 in FIGS. 4 and 5. FIG. 4 shows the temperature detection section 26 on which the pot 12 is not placed. A heat ray source 32 such as black body paint is coated and fired on the back side of a heat-sensitive cylinder 31 that slides up and down in the center of the heater 4, and the heat-sensitive cylinder 31 is held by a temperature detection part support fitting 25. Stopper 3 formed by a notch in the holding cylinder 33
4 through a coil spring 35. In addition, the entire end of the heat-sensitive tube 31 hangs downward to block the radiant heat of the heater 4 from the side, and the tip claw portion 36 is bent inward, so that the holding tube 3
3 and restricts upward movement.
Figure 5 shows the temperature detection unit 2 when the pot 12 is placed.
It is 6. At this time, the heat-sensitive tube 31 pushes the coil spring 35 downward, and the reaction causes the heat-sensitive tube 31 to come into pressure contact with the bottom surface of the pot 12, so that the temperature is measured. In this state, the heat-sensitive tube 31 is attached to the holding tube 33.
There is no contact at the outer end, and therefore the influence of radiant heat from the heater 4 is reduced, making it possible to measure the bottom surface temperature of the pot 12 more accurately.

In the above embodiment, only one heat ray reflecting mirror 29 is used, but it goes without saying that a plurality of heat ray reflecting mirrors 29 may be used.

Effects of the Invention As is clear from the above explanation, according to the present invention, the temperature of the heat-sensitive cylinder, which is provided to be able to slide up and down against the heater, which reaches 700 to 800 degrees Celsius, can be adjusted to a low temperature that is less affected by the heat from the heater. Since it is for detection by an infrared sensor installed in the section, the electric signal processing section is low temperature and highly reliable.Since it detects temperature changes of a single heat sensitive cylinder, it has the effect of having a small heat capacity and good thermal response. have In addition, since a heat ray source is provided on the back of the heat-sensitive tube, the infrared output (sensitivity) is high. Furthermore, since the temperature detection part is constructed using a heat-sensitive tube and a heat ray source, there is a great effect that there is no influence from the material of the pot, dirt, etc. Furthermore, since a heat ray reflecting mirror is used, there is no possibility of accidentally boiling. Another advantage is that the infrared sensor will not be destroyed even if it is spilled.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a configuration example of a conventional electric range, FIG. 2 is a sectional view of a temperature sensor section of a conventional electric range, and FIG. 3 is a sectional view of an electric range showing an embodiment of the present invention. Figure 4 is a cross-sectional view of the temperature detection part of the electric range with no pot placed on it;
The figure is a cross-sectional view of the same temperature detection unit when it is placed on a pot. 4...Heater, 26...Temperature detection unit, 29...
Heat ray reflector, 30... Infrared sensor, 31... Heat sensitive cylinder, 32... Heat ray source.

Claims (1)

[Claims] 1. A heater that heats a container such as a pot, a heat-sensitive tube that slides up and down with respect to the heater and is configured to block radiant heat, a heat ray source installed on the back side of the heat-sensitive tube, and a heat ray source installed on the back side of the heat ray source. A heat ray reflecting mirror installed below,
An electric range comprising an infrared sensor that includes the heat ray reflecting mirror in a viewing angle and is provided at a position thermally distant from the heater.