JPH077861Y2 - Jarpot temperature detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a jar pot temperature detector that automatically controls boiling, heat retention, and protection functions of a jar pot.

(Prior Art) Conventionally, various types of jarpot temperature detectors for automatically automatically controlling boiling, heat retention, and protection functions have been devised. Among them, the one having the best temperature detection sensitivity is shown in FIG. It has a structure in which a temperature detector and a heating unit are combined as shown in FIG.

In FIG. 3, a temperature detector 8 in which a temperature detecting element is installed inside a protective tube is inserted into a hole formed in the bottom surface 1a of the hot water tank 1 together with a packing (not shown), and the outer bottom surface of the hot water tank 1 is inserted.
A heat collecting plate 9 made of aluminum or the like, which is provided between the 1b and the heaters 6 and 6 and has a high heat conductivity, is extended to the base portion of the temperature detector 8 and is integrally fixed by screws or the like. .

Generally, in the method of detecting boiling by the temperature detector provided on the bottom surface of the hot water tank, the water transitions to the boiling state only by convection without stirring, so even if the water in the upper part of the hot water tank blows out steam to bring it to the boiling state, The water at the bottom is still before boiling,
It is necessary for the temperature detector to detect boiling for at least 3 minutes after the steam is blown. If the lid of the jar pot is opened in this state, the hot water splashes and splashes, which is extremely dangerous.

However, according to the temperature detector of the structure shown in FIG. 3, the water in the upper portion is in a boiling state, and even before the water in the lower portion is still boiling, the temperature detector 8 does not use water to directly heat the heater 6 by the heat collecting plate 9. ,
Since heat is given from 6, it is possible to detect a temperature higher than the lower water temperature, and it is possible to detect boiling earlier than the actual water temperature.

In such a temperature detector, the time from when the steam is blown to when the temperature detector detects boiling is about 1 minute 30 seconds, which is extremely short.

However, in such a temperature detector, the protection tube used is very expensive because it is manufactured by cutting, and at the same time, when the water is accidentally boiled in the absence of water, the protection tube of the temperature detector is Since it is made of stainless steel and has a large heat capacity, it takes a considerable amount of time to detect an abnormal temperature rise and turn off the heater, and the heater becomes extremely hot. Therefore, there are drawbacks such as deformation of the heater and deterioration of the packing for mounting the temperature detector due to the residual heat, resulting in water leakage.

(Problems to be solved by the invention) The present invention eliminates the above-mentioned drawbacks, does not delay the boiling detection time, shortens the empty cooking detection time, eliminates the parts that cause deterioration, and is an inexpensive jar. It is to provide a pot temperature detector.

(Means for Solving the Problems) In order to achieve the above object, a jar pot temperature detector according to the present invention comprises a first heat collecting plate, a temperature detecting element, and a temperature detecting element section facing downward from the outer bottom surface of the bath. Insulating heat insulating material that is not covered and the second heat collecting plate are adhered and laminated in the above order,
The second heat collecting plate is configured to be tightly fixed between the outer bottom surface of the hot water tank other than the first heat collecting plate portion and the heater.

(Function) In the temperature detector configured as described above, only the first and second heat collecting plates and the temperature detecting element are in good thermal contact, and the water temperature and the heat of the heater are detected. Since it is conducted through the element, it is possible to obtain the same thermal response characteristics as when a protective tube is used as in the conventional example while being installed outside the bath.

In addition, even when cooking in the air, since the temperature detector does not have a thick protective tube and the heat capacity is small, it is possible to detect abnormal temperature rise earlier than the conventional example, prevent the heater from deforming, and do not use a protective tube or packing. Even when overheated, the defect of causing water leakage does not occur.

Embodiment Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a jar pot temperature detector according to the present invention.

FIG. 2 is a plan view of the second heat collecting plate used in this example.

Referring to FIG. 1, a first heat collecting plate 2 made of aluminum having a thickness of 0.05 mm and a diameter of 30 mm downward toward the outside of the convex portion having a diameter of 32 mm provided on the bottom surface 1a of the hot water tank 1, a thermistor 3 having a diameter of 1.0 mm, the outside Diameter φ3
A ring-shaped insulating heat insulating material 4 made of silicone rubber sponge of 0 mm, inner diameter φ5 mm, and thickness of 1 mm, and a second heat collecting plate 5 made of aluminum are closely laminated in this order, and fixed at an angle 7 from below. . The second heat collecting plate 5 is the outer bottom surface of the water bath 1.
It is arranged up to the periphery of 1b, outer diameter φ120 mm, inner diameter φ40
It is tightly fixed by the ring-shaped heaters 6, 6 of mm. Here, the second heat collecting plate 5 has a shape in which the central portion is narrowed down as shown in FIG. 2, the outer diameter D ₁ is 100 mm, and the outer diameter D _{2 of the} inner circle is
It consists of a thin aluminum plate with a thickness of 28 mm and a thickness of 0.05 mm.

Also, heaters 6 and 6 are mica of 700W for boiling and 70W for heat insulation.
The heater is unitized.

Here, in order to compare the temperature detector according to the present embodiment configured as described above and the conventional temperature detector as shown in FIG. 3, the time from when the steam is blown to when the boiling is detected is determined. It was measured. As a result, the temperature detector of the conventional example had a time of about 1 minute and 30 seconds, while the temperature sensor of the present example has a time of about 1 minute 30 seconds.
It was 40 minutes.

Next, in so-called empty cooking of heating in the absence of water, the time until detecting an abnormal temperature rise was measured, and it was about 45 seconds in the conventional example, and about 20 seconds in the present example.
It was seconds.

As described above, in this embodiment, the first and second heat collecting plates 2 are
Only the elements 5 and 5 and the element part of the thermistor 3 are in good thermal contact with each other, and the transfer of heat relating to temperature detection is predominantly performed through the thermistor. Can obtain the same boiling detection time.

In addition, since the heat capacity of the temperature detector is small in the air cooking, the detection time of the abnormal temperature rise can be shortened to less than half that of the conventional example.

Although the thermistor is used as the temperature detector in this embodiment, it goes without saying that the same result can be obtained by using a thermocouple or the like. Further, although an aluminum thin plate having a high thermal conductivity is used as the heat collecting plate, the same applies when copper or another material is used. Further, it is possible to obtain high heat conduction by applying silicone grease or the like to each laminated portion to enhance the adhesion.

(Effect of the Invention) As described above, according to the present invention, since the heat transfer from the heater to the water for temperature detection is predominantly performed through the temperature detection element, the conventional protection tube is used. It is possible to obtain the same boiling detection time as that of the one, and in the case of boiling, the heat capacity is extremely smaller than that of the protective tube, so the time until detecting an abnormal temperature rise can be significantly shortened, and the heater deformation Can be prevented.

Furthermore, since an expensive protection tube or packing is not used, water leakage does not occur at the time of overheating, and an extremely safe jar pot temperature detector can be provided at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a jar pot temperature detector according to the present invention. FIG. 2 is a plan view of the second heat collecting plate used in this example. FIG. 3 is a sectional view of an essential part showing an example of a conventional jar pot temperature detector. 1 …… Bath 1a …… Bottom 1b …… Outside bottom 2 …… First heat collecting plate 3 …… Thermistor 4 …… Insulating heat insulating material 5 …… Second heat collecting plate 6 …… Heater 7 …… Angle 8 ... Temperature detector 9 ... Heat collector

Claims (1)

[Scope of utility model registration request] 1. A first heat collecting plate, a temperature detecting element, an insulating heat insulating material which does not cover the temperature detecting element portion, and a second heat collecting plate which are in contact with each other in the above order in a downward direction from the outer bottom surface of the bath. Is
A jar pot temperature detector in which a second heat collecting plate is closely fixed between an outer bottom surface of the hot water tank other than the first heat collecting plate portion and the heater.