JPH0143216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a temperature control device in a cooking appliance, and this temperature control device includes a temperature sensor that detects the temperature of the outer bottom surface of a container to be heated, and an electric circuit. To provide a cooking device that accurately determines the temperature of the outer bottom surface of a container.

Conventionally, there are electric automatic rice cookers and electric stoves that control the temperature inside the heated container by detecting the bottom surface temperature of the heated container and controlling the firepower. An electric automatic rice cooker is designed as a single-function appliance, uses a special container, and achieves the general purpose of temperature control through automatic control means. On the other hand, as shown in FIG. 1, an electric stove is equipped with a temperature sensor 3 as a heat-sensitive part in the center 2 of a hot plate (embedded heater) 1 to detect the bottom temperature of a container to be heated and control the heat. The type of material of containers such as aluminum pots and enameled pots, the shape of the container (pot bottom), and the sides of the container are uneven, and the temperature control ranges over a wide range depending on the cooking content, so the temperature sensor 3 needs to work accurately. be. However, the electric stove is simply provided with a temperature sensor 3 in the central space 2 of the hot plate 1.
When you pour water into a pot and boil it, temperature sensor 3
is heated by the radiation from the hot plate 1, and becomes hotter than the outer bottom surface of the container to be heated, and can be activated before the outer bottom surface reaches the specified temperature, that is, before the temperature of the water in the container to be heated does not reach the specified temperature. be. In other words, when the set temperature is set to 100°C and electricity is turned on, the temperature sensor 3 reaches the set temperature when the temperature of the water in the heated container is 75°C.

In addition, if a pot containing water is placed on the hot plate while it is being heated to a high temperature, the temperature sensor 3 will receive a large amount of radiation from the hot plate 1, and the water temperature will rise to the temperature sensor 3.
temperature does not drop. In other words, the difference between the water temperature and the temperature of the temperature sensor 3 is larger, and the temperature sensor 3 operates before the specified temperature is reached, which is the same result as described above. As a countermeasure, a heat shield tube is provided around the outer periphery of the sensor, but a single heat shield tube does not provide a sufficient effect and results are similar to those described above.

The present invention solves the above-mentioned drawbacks and constantly detects the accurate temperature of the outer bottom surface of the cooking container to control the temperature inside the container to a specified temperature. below,
An embodiment of the present invention will be described.

FIG. 2 is a sectional view of this embodiment, FIG. 3 is a longitudinal sectional view of the main part, and FIG. 4 is a top view.

That is, a spiral electric heater 4 as a heat source is placed on a heater holder 5, and the heater holder 5 is connected to three heater support beams 5-1, 5-.
2 and 5-3, and a fixing fitting 6 that connects each support beam. The support beam 5-1 has claws 7 for fixing the electric heater 4. Heater connection piece 1 is attached to terminal sheath tube section 9, 9' near terminal 8 of electric heater 4.
0, and a spring plate 11 that biases the electric heater 4 in the inner circumferential direction is welded thereto. Furthermore, the spring plate 11 is fixed to the electric stove outer peripheral frame 12 with screws 13. The outer edge 15 of the soup saucer 14 is placed on the outer peripheral frame 12 of the electric stove, and the soup saucer 14 has a protrusion 16 at its center and a central hole 17 in the soup saucer 14. Further, the outer edge 15 is provided with a notch 18 only at the upper part of the sheath tube 9, 9' where the terminal 8 is located. The heater receiver 5 is received by the inner step 19 of the soup tray 14, and a support beam 5-1 is pressed into the cutout 20 of the inner step.
There is a temperature sensor 21 in the center of the electric heater 4, which passes through the center hole 17 of the soup tray 14, and is inserted into the insertion hole 24 of the sensor mounting base 23 and the insertion hole of the sensor fixing fitting 25, which is fixed to the electric stove outer frame 12 with screws 22. A guide shaft 26 consisting of a pipe at 24'
is inserted and prevented from coming off with a split pin 27, and a spring 29 is inserted between the guide shaft spring receiver 28 and the sensor mounting base 23 to constantly push the guide shaft 26 upward. The spring receiver 28 is inclined downward. The spring 29 enters the inside of the spring receiver 28 and the outside of the guide hole 30 of the sensor mounting base 23, and thus has a slightly larger diameter at the top than the guide shaft 26 and a widened bottom at the bottom.
Here, the outer diameter of the guide hole 30 of the sensor mounting base 23 is set to be equal to or smaller than the outer diameter of the spring receiver 28, and the sensor head 31 is always pushed out so as to protrude from the surface of the electric heater 4. Further, there is a cylindrical heat shielding cylinder 32 of the temperature sensor 21 between the electric heater 4 and the temperature sensor 21 in a concentric circle,
The heat shielding tube 32 is a double heat shielding tube that is made by integrating cylindrical inner tubes 32-1 and outer tubes 32-2. The inner cylinder 32-1 has several protrusions 33 on the top.
There is also a spring receiver 34 in the center, which is tilted downward. The protrusion 33 and the spring receiver 34 are provided in the center direction, whereas the lower part of the inner cylinder 32-1 has an L-shaped bend 35 in the outer circumferential direction, and is provided in several places around the lower part of the inner cylinder 32-1. There is. Further, the inner diameter of the inner cylinder 32-1 is larger than the outer diameter of the convex portion 16 of the juice receiving tray 14. on the other hand,
The outer cylinder 32-2 has a larger diameter than the inner cylinder 32-1, has an open lower part and a flat ring 36 at the upper part, and further has a collar 37. The outer diameter of the collar 37 is equal to the convex part 33 of the inner cylinder 32-1. It is slightly smaller than the inner diameter of. The heat shielding cylinder 32 having a double structure has a collar 37 of an outer outer cylinder 32-2 fitted into a convex part 33 of an inner inner cylinder 32-1, and corresponds to an L-shaped part 35 at the bottom of the inner cylinder 32-1. A protrusion 33' is provided at the lower part of the outer cylinder 32.2 and fixed by welding or the like, and the lower part of the heat shield cylinder 32 with a double structure is open to the atmosphere, and the upper part is covered with the ring 36 of the outer cylinder 32-2. ing. Further, a plurality of ventilation holes 38 are provided in the upper part of the inner cylinder 32-1 inside the heat shield cylinder 32, and a plurality of ventilation holes 38' are also provided in the upper part of the outer cylinder 32-2. Note that there is a ventilation hole 38' at a position above the ventilation hole 38, and the ventilation hole 38 and the ventilation hole 3
8' are arranged so as not to overlap each other in the radial direction of the heat shield cylinder 32. The double structure heat shield cylinder 32 has a spring 39 inserted between the outer periphery of the convex part 16 of the juice tray 14 and the spring receiver 34 to constantly push the double structure heat shield cylinder 32 upward. The upper surface of the heat shield cylinder 32 (ring 36) of the structure
is pushed out so as to come out from the 4th surface of the electric heater 4, and is movable up to approximately the same height as or higher than the sensor head 31 so as to shield the sensor head 31 from the radiant heat from the electric heater 4. There is. The upper surface (ring 36) of the sensor head 31 and the heat shield cylinder 32 is always connected to the cooking container 4.
Contact the outer bottom surface of 0. In addition to the above, there are other parts necessary for the stove, such as a control case, a control circuit for the temperature sensor 21, and operation knobs, but these are omitted. In the embodiment, an example is shown in which the electric heater 4 uses a double-layered heat shield cylinder 32, but the present invention can also be used when the heat source is a gas burner or the like.

When using the cooking container 40 on the electric heater 4 as shown in FIG. 2, the temperature sensor 21
The temperature difference between, for example, the aqueous solution in the cooking container is very small for the following reasons, and the response is accurate. That is, as shown in FIG. 2, the central hole 17 of the soup pan 14 has a wide area that allows cold air to enter easily, so that the cold air enters through the central hole 17 of the soup pan 14 and then passes through the guide shaft 26 of the temperature sensor 21 and the center of the soup pan 14. It has ventilation by passing through the inner cylinder 32-1, which has a larger diameter than the hole 17, and passing through the ventilation hole 38 and the ventilation hole 38' in order. Therefore the temperature sensor 21
In particular, the outer periphery of the sensor head 31 is constantly cooled by cold air at room temperature, and the upper surface of the sensor head 31 receives heat from the outer bottom surface of the cooking container 40. Furthermore, although the ambient temperature between the electric heater 4 and the soup pan 14, that is, around the heat shield tube 32, is 200° C. or more, there is an air layer, and the air layer is located at the lower joint of the inner and outer heat shield tubes 32. Vent hole 3 above
Since double heat shielding is provided with ventilation to 8', the radiation received on the upper surface of the sensor head 31 can be sufficiently blocked, and the inner cylinder 32-1 and outer cylinder 32-2 can be The joint surface has several protrusions 33, 33'
Because it is a point joint at
The upper surface of the sensor head 31 receives heat from the outer bottom surface of the cooking container 40, which is difficult to transmit to the sensor head 2-1. If the heat shield cylinder 32 is one layer, a sufficient effect cannot be obtained and the temperature difference is large. Furthermore, when the outer bottom surface of the cooking container 40 and the electric heater 4 are not in close contact with each other, the electric heater 4 may remain red hot, and the ambient temperature of the heat shield tube 32 becomes even higher. Due to these effects, no problem arises, and the heat shield cylinder 3 on the outer periphery of the temperature sensor 21
Since the ring 36 of No. 2 is always in contact with the outer bottom surface of the cooking container 40, even if the heat shield cylinder 32 is heated,
The food is cooled in the cooking container 40, and the sensor head 31 is thus protected from radiation, so that the temperature difference between the food to be cooked and the temperature sensor 21 is small. Moreover, the ventilation holes 38 and 38' of the heat shield tube 32 are
Since they do not overlap in the radial direction, the sensor head 31 is not directly exposed to heat rays (electromagnetic waves) from the electric heater 4. Furthermore, even when the electric heater 4 is heated and the cooking container 40 containing water is placed on it, the sensor head 31 is easily cooled down by the cool air flowing through the cooking container 40 and the heat shield tube 32, causing a big problem as described above. It does not cause

Further, the ring 36 and collar 37 of the outer cylinder 32-2 may not be provided. In other words, the inner cylinder 32-1, the outer cylinder 32-
There is no problem even if the upper part of 2 is a space, and the inner cylinder 32-1,
The outer cylinder 32-2 may have a cylindrical shape and may be brought into contact with the outer bottom surface of the cooking container 40 with individual springs.

In addition, the boiled liquid from the cooking container 40 flows down the side of the cooking container 40 and is transmitted to the outer bottom surface, but is blocked by the electric heater 4 and
flows down to Even if the flow flows toward the center of the temperature sensor 21, since the heat shield tube 32 on the outer periphery of the temperature sensor 21 is in contact with the outer bottom surface of the cooking container 40, it is blocked by the heat shield tube 32 and the side surface of the outer tube 32-2 is blocked. The liquid that flows into the drip saucer 14 is the sensor head 3.
1 does not get dirty, and the spring 29 pushing up the temperature sensor 21 does not stick, so the temperature sensor 21 always works normally and comes into contact with the outer bottom surface of the cooking container 40 to accurately detect the temperature. Further, the spring 39 pushing up the heat shield cylinder 32 does not stick and always functions normally.

If the entire electric heater 4 is pressurized in the direction of the terminal sheath pipes 9 and 9', the heater support beam 5-1 of the heater holder 5 of the electric heater 4 will be removed from the juice tray 14. Internal stepped notch 2
The screw 1 that is off from 0 and fixes the spring plate 11
3, remove the electric heater 4 upwards, and remove the heat shield tube 32 and the juice pan 14 from the temperature sensor 21.
Since the inner diameter of the central hole 17 is sufficiently large, the heat shield cylinder 32 and the juice pan 14 can be easily inserted without damaging the temperature sensor 21.
The top can be removed for easy cleaning.

As described above, the present invention relates to the material, shape, and shape of the cooking container.
This device always detects the accurate temperature of the outer bottom surface of the cooking device even if the sizes are uneven, and also has the advantage of making it easier to clean spilled liquid. Although the example uses the electric heater 4, a gas burner or the like can also be used as the heat source.

In addition, the heat shield tube, which is composed of an inner tube and an outer tube, can move up and down and come into contact with the pot, and the ventilation holes provided in the inner tube and outer tube do not overlap each other in the radial direction of the heat shield tube. It can completely block the radiation of the heat source, and even if there is boiling over from the pot, it will be blocked by the heat shield cylinder and will not stick to the temperature sensor, so the temperature can be detected accurately. And 2 with breathability
Since it is formed into a layered heat shield cylinder, the area around the temperature sensor is cooled by air flow, and the air between the two layers provides heat insulation, making it possible to accurately detect temperature. Furthermore, the air circulation through the heat shield tube causes double cooling, allowing accurate temperature detection.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a longitudinal sectional view of a cooking appliance according to an embodiment of the present invention, and Fig. 3 is an enlarged longitudinal sectional view showing the relationship between the sensor and the heat shield cylinder, which are the main parts of the present invention. FIG. 4 is a top view of the present invention. 4...Electric heater, 21...Temperature sensor,
32...Heat shield cylinder, 32-1...Inner cylinder, 32-2...
...Outer cylinder, 33, 33'...Protrusion, 38, 38'...
...vents.

Claims (1)

[Claims] 1. A heat source 4 that heats the food to be cooked, a temperature sensor 21 disposed in the central space of the heat source 4 so as to be movable up and down, and a temperature sensor 21 disposed on the outer periphery of the temperature sensor 21 that is movable and substantially the same as the temperature sensor 21. or higher, the upper end of which is movable;
A heat shielding tube 32 is provided to shield the temperature sensor 21 from heat, and the heat shielding tube 32 is connected to an inner tube 32-1 and an outer tube 3.
The inner cylinder 32 is formed into a double structure consisting of 2-2.
-1 and the upper part of the outer cylinder 32-2 are provided with ventilation holes 38 and 38', respectively.
The cooking device is located at a higher position and is arranged so that the respective ventilation holes 38 and 38' do not overlap with each other in the radial direction of the heat shield cylinder 32.