JP3191609B2 - pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot having a function of once boiling hot water and cooling the hot water.

[0002]

2. Description of the Related Art Heretofore, the present inventors have used a Peltier element (electronic cooling element) as a cooling means as a pot having a water heating and cooling function, and selectively heat-couple this Peltier element to a container only during cooling. (JP-A-2-97153).

Further, Japanese Patent Application Laid-Open No. Hei 6-343550 discloses a cooling device in which hot water is circulated through a heat exchange means using a Peltier element as a cooling means.

[0004]

However, in any of the above-mentioned conventional devices, a heating means and a temperature detecting means are provided on the outer bottom of the container for accommodating the liquid, and the cooling effect of the cooled liquid is enhanced. Therefore, there were the following problems when trying to insulate the container.

[0005] First, in order to insulate the container, it is necessary to perform an insulating process including a heater as a heating means. Considering that the temperature of the heater at the time of boiling water is usually around 200 ° C, the material is glass wool. It is limited to. However, glass wool absorbs moisture when it breathes with the outside air, and when the liquid in the container is low in temperature, dew condensation occurs and the heat insulation effect is remarkably reduced. . In order to prevent moisture absorption and dew condensation, it is conceivable to cover the insulation with a highly airtight case.However, the power supply line to the heater, the signal line to the temperature detection means, and the liquid in the container must be It is necessary to penetrate a water pipe or the like for discharging to the inside and outside of the case, and it is extremely difficult to maintain airtightness.

That is, the conventional pot has a problem that it is difficult to satisfy high heat insulation performance, high heat resistance and airtightness at the same time.

If the liquid is cooled and then kept cool in a container having high heat insulation, the warmed liquid moves to the upper part and the cold liquid remains at the lower part of the container. There is also a problem that the temperature detecting means does not cause a temperature change at first, and cannot detect the temperature change until the temperature of the liquid in the container rises considerably.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-343550, in the case of cooling by circulating the heat through a heat exchange means provided outside the vessel, the heat exchange is carried out at the beginning of the circulation. Since the liquid staying in the means and heated to about the same temperature as room temperature is returned to the container, there is also a problem that the temperature of the liquid in the container is rather increased.

The present invention solves the above-mentioned conventional problems, and provides a pot having high heat insulation and airtightness, excellent durability without moisture absorption or dew condensation, and a cooling device.
The aim is to increase the cooling efficiency of the Peltier element that constitutes the stage.
Target.

[0010] In addition to the first object, a second object is to provide a pot that appropriately cools the temperature of the liquid in the container, cools the liquid, and maintains the liquid at a predetermined temperature.

Further, the addition to the first object, that cooling means in the or al warmed liquid provided outside at the start of cooling to provide a good pot efficient prevents the reflux into the container 3 The purpose of.

[0012] In addition to the first object, a fourth object is to surely prevent the heated liquid in the cooling means from flowing back into the container.

In addition to the first object, a fifth object is to prevent the heated liquid in the cooling means from flowing back into the container and to improve the assemblability.

In addition to the first object, a sixth object is to prevent the heated liquid in the cooling means from flowing back into the container and to reduce the number of components.

In addition to the first object, a seventh object is to prevent the heated liquid in the cooling means from flowing back into the container and to utilize the existing temperature detecting means.

[0016]

In order to achieve the above object , a first object of the present invention is to provide a container for containing a liquid, a heat insulating material for insulating the container, and a temperature of the liquid in the container. Temperature detecting means for detecting the temperature, first and second flow paths connecting the lower part and the upper part of the container, and the first flow path
And shared a portion of the second flow path and connected to the shared flow path
A switching valve, a heating means provided in the first flow path, a cooling means formed of a Peltier element provided in the second flow path , and a container provided in a shared portion of the first and second flow paths and circulation means for circulating the liquid in the inner, after the liquid in the container was heated to boiling by the heating means, by cooling with the cooling means, the cooling so that the detected temperature of the temperature detecting means becomes a predetermined temperature Means and circulation means are driven intermittently as appropriate.
And it has a control unit for cold Te.

[0017] The second of the second means for solving problems of the present invention to achieve the object, the control means in the first and second means for solving problems is, in the container by driving the circulating means at predetermined time intervals The liquid is stirred, and after the stirring, the temperature of the liquid is detected by the temperature detecting means.

A third means for solving problems of the present invention in order to achieve the third object, in the case of cold liquids, the pre-cooling function to operate the circulating means a cooling means after driving a predetermined time Have

The fourth means for solving problems of the present invention to achieve the fourth object has a second temperature detecting means for detecting the temperature of the liquid in the cooling unit, the second temperature sensing Pre-cooling is performed based on the temperature detected by the means.

The fifth means for solving problems of the present invention in order to achieve the above fifth object is to determine the pre-cooling time based on room temperature.

[0021] The sixth sixth means for solving problems of the present invention to achieve the objective of having a third temperature detection means provided in the radiator which constitutes the cooling means, said third temperature Preliminary cooling is performed based on the temperature detected by the detecting means.

The seventh means for solving problems of the present invention to achieve the seventh object of the inputs and quantity detecting means for detecting an amount of liquid in the container, the detected temperature from the temperature sensing means,
Temperature gradient calculating means for calculating a temperature decrease gradient during cooling;
And a pre-cooling time determining means for determining a pre-cooling time based on a value obtained by dividing the temperature decrease gradient by the amount of the liquid.

[0023]

According to the first means for solving the above problems, the liquid in the container is circulated through the first flow path connecting the lower part and the upper part of the container, and the liquid in the container is heated by the heating means. When the liquid boils, the liquid flows through the second flow path and is cooled by the cooling means, and the cooling operation is performed until the liquid reaches a predetermined temperature. Then, a cooling operation is performed so as to maintain the predetermined temperature. Cooling action
During operation , dew condensation generally occurs on the outer wall of the container because it is kept cooler than room temperature, but since the outer wall of the container is covered with heat insulating material, dew condensation occurs on the heat insulating material covering the container Never do. In addition, since the heater of the heating means is not attached to the container as in the related art, and the heating means is provided in the first flow path, only the container needs to be insulated without worrying about the heater. It can have a structure and can be free of moisture absorption and dew condensation. Also, containers,
The amount of heat leak in the second channel and the cooling means, that is,
Since there is a loss that does not contribute to cooling, Peltier
Attempting to cool the device by reducing the current flowing through the element
If the loss is too large for the cooling
Focus on low efficiency, that is,
Intensive cooling and intermittent operation
By doing so, the cooling efficiency is increased.

According to the second means for solving the above problems, the circulating means is driven at predetermined time intervals to stir the liquid in the container and suppress the occurrence of upper and lower temperature layers in the container. After the stirring, the average temperature of the liquid in the container can be detected by detecting the temperature of the liquid by the temperature detecting means.

According to the third means for solving the above problems, the liquid in the heat exchange flow path is cooled to, for example, about 10 ° C. by the pre-cooling and then returned to the container, so that the temperature of the liquid in the container increases unnecessarily. Nothing.

According to the fourth means for solving the above problems, preliminary cooling is performed until the second temperature detecting means detects that the temperature of the liquid in the cooling means decreases to a predetermined temperature, and thereafter,
Since the liquid in the cooling means is returned to the container, the liquid in the cooling means can be returned when the temperature is accurately lowered.

According to the fifth means for solving the above problems, the pre-cooling time is determined by using the room temperature which is correlated with the liquid temperature in the cooling means. Since the room temperature detecting means for detecting the room temperature is easy to attach, the assembling workability can be improved.

According to the sixth means for solving the above problems, since the temperature of the radiation fin correlated with the room temperature is used,
Precooling control can be performed by using the third temperature detecting means for detecting the abnormal temperature of the radiation fin.

According to the seventh means for solving problems, along with so the temperature decrease gradient to determine the pre-cooling time based on the value obtained by dividing the amount of liquid, guess the cooling efficiency of the cooling means from the temperature decrease gradient, liquid By dividing the temperature decrease gradient inversely proportional to the amount of the liquid by the amount of the liquid, the effect of the amount of the liquid can be eliminated, and the precooling time can be accurately determined.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the pot of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of the pot of the present embodiment, and FIG. 2 is a block diagram. As shown in FIG. 1, a container 1 containing a liquid such as tap water is covered with a case 2 except for a bottom center, and a space formed by the container 1 and the case 2 is filled with a heat insulating material 3. I have. At the center of the bottom of the container 1, a temperature detecting means 4 for detecting the temperature of the liquid is provided, and another heat insulating material 5 is press-fitted therein and insulated. The first flow path 6 and the second flow path 7 connecting the lower part and the upper part of the container 1 have a part in common, penetrate the case 2 and the heat insulating material 3, and circulate through the common flow path part Electric pump 8
And a switching valve 9.

The first flow path 6 is provided with a boiler 10 as a heating means, and the second flow path 7 is provided with a cooling means 11
Is provided, and the second flow path 7 is buried in the heat insulating material 3 as much as possible. The cooling means 11 has a structure in which a heat exchange channel (heat exchange vessel) 12 through which a liquid passes is sandwiched with the heat absorbing sides of two Peltier elements 13 inside, and further sandwiched by radiation fins 14 from outside thereof. Thermally bonded.
The radiation fins 14 are air-cooled by a fan 15. Further, from the bottom of the container 1, there is a discharge path 16 for guiding the liquid in the container 1 to the outside, and there is a discharge pump 17 in the middle thereof. These structures at the bottom are also covered with another heat insulating material 18, (Not shown here). Reference numeral 19 denotes a lid for opening and closing the upper opening of the container 1.

Further, as shown in FIG.
Is transmitted to the control means 20, and the control means 20 controls the driving of the electric pump 8, the switching valve 9, the boiler 10, the cooling means 11, the fan 15, and the discharge pump 17 as the circulation means.

The reason why the first flow path 6 and the second flow path 7 are partially common in the present embodiment is that the discharge pump 17 and the motor 17a for driving the discharge pump 17 are conventionally used. The service life of at most 500 hours is sufficient,
The life of the electric pump 8 and the motor 8a for driving the circulation means is required to be 30,000 hours or more and is expensive, and providing the first flow path 6 and the second flow path 7 increases the cost. Therefore, one electric pump 8 is used in common and the cost is reduced. If the cost is neglected, the first flow path 6
A drive motor may be provided in each of the first and second flow paths 7. In this case, the switching valve 9 for switching the flow to one of the first and second flow paths becomes unnecessary.

Next, the operation will be described. Control means 20
When a start key (not shown) connected to is pressed,
The control means 20 drives the electric pump 8 as the circulating means by setting the switching valve 9 to the first flow path 6 side, and then energizes the boiler 10 as the heating means to perform water heating. Based on the signal from the temperature detecting means 4, the boiling of the liquid in the container 1 is detected, and the boiler 10 is turned off after energizing for another 4 minutes for a waterfall, and after the temperature of the boiler 10 has cooled down 30 seconds later. The electric pump 8 is stopped.

Thereafter, the switching valve 9 is switched to the second flow path 7 side, and the cooling means 11 and the electric pump 8 are driven to start cooling the hot water. When power is supplied to the Peltier element 13 constituting the cooling means 11, the heat is absorbed from the liquid through the heat exchange channel 12 and is released to the radiation fins 14. Radiation fins 14
Since the air is cooled by the fan 15, the liquid is cooled by circulating through the cooling means 11. The cooling operation is stopped when the temperature of the liquid in the container 1 is cooled to 9 ° C., which is 1 ° C. lower than the predetermined temperature (10 ° C.). I do. Thereafter, this operation is repeated to maintain the liquid at a predetermined temperature.

Here, the reason why the cooling is interrupted to keep the liquid at a predetermined temperature will be described. In general, it is known that the characteristic of the current versus the amount of heat absorbed by the Peltier element 13 is a quadratic curve convex upward. FIG. 3 is a characteristic diagram of the current versus heat absorption of the Peltier element 13 used in the present embodiment.
h) and the temperature difference between the heat absorption side (Tc) and 50 ° C.
In this embodiment, two Peltier elements 13 are connected in series, and a current of about 3.2 amps is passed to obtain a total heat absorption of about 16 watts (point A).

In this embodiment, as described above, the heat insulation treatment is carefully performed on the container 1, the second flow path 7, and the like, but the container 1, the second flow path 7, and the cooling means 1 are still used.
There is a total of about 11 watts of heat leak at 1. That is, 11 watts is a loss (loss) and does not contribute to cooling. Therefore, if the current in the Peltier element 13 is to be reduced and the cool operation is to be performed after the liquid in the container 1 has cooled down to a predetermined temperature, it is necessary to operate the device on the right side of the point A in FIG. Assuming that the operation is performed at the point C, as apparent from FIG. 3, the loss is excessively large and the efficiency is low with respect to the contribution to the cooling. In other words, it is more efficient to perform the cooling intensively to perform the intermittent operation even if the operation is for keeping the cold. Therefore, in the present embodiment, the intermittent operation is performed at the operating point at the time of keeping cold as the point A as in the case of cooling.

Next, a second embodiment of the present invention will be described. In this embodiment, the overall configuration is the same as that of the first embodiment, and a description thereof will be omitted. FIG. 4 shows that the water in the container 1 is once cooled to 9 ° C. lower by 1 ° C. than the predetermined temperature,
It is a figure which shows the time change of the water temperature of the upper layer part, the middle layer part, and the lower layer part of the container 1 when it is made to stand after that. Although the container 1 is insulated, the water therein gradually warms due to a slight heat leak, and the warmed water moves upward and initially only the water temperature of the upper layer mainly rises. When more water is warmed and moved to the upper layer, the temperature of the middle layer starts to rise. Finally, the water temperature in the lower part rises. Therefore, with the temperature detection means provided at the bottom of the container, the temperature does not change while cold water stays at the bottom of the container at first, and the temperature of the liquid in the container rises considerably when the temperature change is finally caught at point D are doing.

Therefore, in this embodiment, after 30 minutes have passed after cooling the water in the container 1 to 9 ° C., which is lower by 1 ° C. than the predetermined temperature, the water is circulated by driving the electric pump 8 as a circulating means. Then, the water in the container 1 is mixed. FIG. 5 is a diagram showing the water temperature in the container 1 of the present embodiment operated as described above. After the water in the container 1 is circulated and mixed, the temperature detected by the temperature detecting means 4 is changed to a predetermined temperature (10 ° C.). ℃), cooling starts.

As described above, in the present embodiment, the occurrence of the upper and lower temperature layers in the container 1 is suppressed, and the liquid in the container 1 is removed at an appropriate time before the temperature of the liquid in the container 1 becomes too high. An average temperature can be detected.

Next, a third embodiment of the present invention will be described. Also in this embodiment, the overall configuration of the first embodiment is the same, and a description thereof will be omitted. The feature of the present embodiment is that in the cooling operation after the water in the container 1 is once cooled to a predetermined temperature, preliminary cooling is performed prior to circulation, and the water heated by the outside air is prevented from flowing back to the container 1. Things. As described in the first embodiment, since the heat exchange channel 12, the Peltier element 13 and the radiation fin 14 are thermally coupled in the cooling means 11, the Peltier element 1
3 is not energized, the water remaining in the heat exchange channel 12 is warmed by the outside air in a short time,
After a few minutes, it will be almost the same as room temperature. FIG. 6 shows the Peltier device 13 with the pump 8 as the circulating means stopped.
Changes in the temperature of water in the heat exchange flow path 12 when electricity is supplied to
Even at room temperature of 35 ° C., it will be about 10 ° C. after cooling for 2.5 minutes. Therefore, in this embodiment, the pre-cooling time is set to 2.5 minutes, and then the circulation is started.

As described above, according to the present embodiment, the water in the heat exchange channel 12 is returned to the container 1 after the temperature in the heat exchange channel 12 reaches about 10 ° C. by the pre-cooling, so that the water temperature of the container 1 rises unnecessarily. There is no.

Next, a fourth embodiment of the present invention will be described. In this embodiment, the overall configuration is the same as that of the first embodiment, and a description thereof will be omitted. In the third embodiment, since the pre-cooling time is uniformly 2.5 minutes, when the room temperature is 20 ° C., as shown in FIG.
The water temperature in 2 becomes almost 0 ° C., which is a little too much for pre-cooling. Also, when an attempt is made to provide a purification filter and a mineral replenishment filter (not shown) made of activated carbon, coral sand, or the like at the outlet of the flow channel 7, if the water in the heat exchange flow channel 12 is too cooled, a part of the It turned out to be ice-like and clogged the filter.

Therefore, the present embodiment is provided with a second temperature detecting means 21 for detecting the water temperature in the heat exchange channel 12 in addition to the third embodiment, and is shown in the block diagram of FIG. Become. FIG. 8 is a sectional view of the cooling means 11. Heat exchange channel 1
Reference numeral 2 denotes a resin cylindrical case 121 having left and right open sides.
Aluminum and stainless steel clad plate 12
2 to form an inlet 123 and an outlet 12 at the top and bottom.
4 and is connected to the flow path 7 by connection packings 125 and 126. A pipe 127 is inserted into the connection packing 125 on the inflow port 123 side in a watertight manner, and a thermistor 128 constituting the temperature detecting means 21 is sealed therein. The radiation fin 14 has a thermistor 2 for monitoring the operating temperature of the Peltier element 13 for protection.
2 is attached.

Next, the operation will be described. 30 minutes after the cooling is stopped, the control means 20 first energizes the Peltier element 13 to start pre-cooling of the water in the heat exchange flow path 12, and the second temperature detection means 21 causes Detect water temperature. When the water temperature reaches 8 ° C., circulation starts. Here, the pre-cooling was performed up to 8 ° C. because the outlet side outlet 124
This is because the amount to be heated in the flow path 7 is anticipated.

As described above, according to the present embodiment, the second temperature detecting means 21 for detecting the water temperature in the heat exchange flow path 12 is provided, and the pre-cooling is performed while monitoring the water temperature. Can be done. In other words, it is possible to prevent the water remaining in the heat exchange flow path 12 from being excessively cooled by the pre-cooling to form a sherbet-like state, and to reduce the water remaining in the heat exchange flow path 12 to a predetermined temperature before the container. 1 to prevent the temperature of the liquid in the container 1 from being raised.

Next, a fifth embodiment of the present invention will be described. This embodiment also has the same overall configuration as the first embodiment, and a description thereof will be omitted. In this embodiment, as shown in FIG. 6, the water temperature change during pre-cooling depends on the room temperature, and it is possible to derive an appropriate pre-cooling time if the room temperature is known. FIG. 9 is a block diagram showing a configuration in which room temperature detecting means 23 is provided in place of the second temperature detecting means 21. The room temperature detecting means 23 includes a second temperature detecting means 21 for detecting a water temperature in the heat exchange flow path 12.
Unlike this, it can be easily provided at any place in the main body. FIG. 10 is a correlation diagram between the room temperature and the pre-cooling determined in this manner. (A) When the room temperature is 30 ° C. or higher--3.0 minutes (a) When the room temperature is 20 ° C. or higher and 30 ° C. or lower--1.5 Minutes (c) When the room temperature is 10 ° C. or more and 20 ° C. or less—0.5 minutes (d) When the room temperature is 10 ° C. or less —————— 0 minutes, and in each case, it is generally 12 ° C. or less, and
It is pre-cooled so that it does not freeze.

As described above, according to the present embodiment, the preliminary cooling can be appropriately performed by the room temperature detecting means 23 which can be easily mounted.

Next, a sixth embodiment of the present invention will be described. In this embodiment, the overall configuration is the same as that of the first embodiment, and a description thereof will be omitted. First, the operation of the thermistor 22 provided on the radiation fin 14 will be described with reference to FIG.
A description will be given with reference to FIG. When the Peltier element 13 is energized, the Peltier element 13 absorbs heat from the water in the flow path via the clad plate 122, radiates heat to the radiating fins 14 by adding self-heating, and is cooled by the fan 15.
However, if the fan 15 stops, the radiation fins 14
Cannot be dissipated, and the temperature of the Peltier element 13 immediately rises and breaks.

Therefore, a thermistor 22 is provided on the radiating fin 14, and the temperature of the radiating surface is monitored by the Peltier temperature detecting means 24. If the temperature rises, the power supply to the Peltier element 13 is stopped. FIG. 12 shows an example of the heat radiating surface temperature and the heat absorbing surface temperature at the time of the cooling operation.
If the temperature of the water in the container 1 is about 10 ° C. and the operation of the fan 15 is normal, when the Peltier element 13 is on, the heat absorption surface temperature (Tc) cools down to about 5 ° C., and the heat radiation surface temperature (Th) becomes 5 ° C.
Although the temperature rises to about 0 ° C., when the Peltier element 13 is turned off, both the heat absorbing surface and the heat radiating surface reach approximately the same temperature as room temperature in about 10 minutes.

Therefore, in this embodiment, the pre-cooling time is determined by using the temperature detected by the thermistor 22, which detects the temperature of the heat radiation surface, as a substitute for room temperature. Specifically, 1 after cooling is stopped
If 0 minutes or more have passed, (e) When the temperature is 30 ° C or higher --- 3.0 minutes (f) When the temperature is 20 ° C or higher and 30 ° C or lower --- 1.5 minutes (G) Temperature is 10 ° C or higher 0.5 ° C when the temperature is 20 ° C or lower. (H) 0 minutes when the temperature is 10 ° C or lower.

On the other hand, if the elapsed time from the cooling stop is less than 10 minutes, the room temperature cannot be estimated from the temperature of the thermistor 22, but it is considered that only 10 minutes have elapsed since the cooling was stopped. Then, since the water in the heat exchange channel 12 is not heated too much, the pre-cooling time is set to 0.5 minutes irrespective of the temperature.

As described above, according to this embodiment, the room temperature can be measured by the temperature detecting means originally provided to protect the operation of the Peltier element, and the pre-cooling can be appropriately performed. Become.

Next, a seventh embodiment of the present invention will be described. In this embodiment, the overall configuration is the same as that of the first embodiment, and a description thereof will be omitted. FIG. 13 is a block diagram of the present embodiment. The temperature gradient calculating means 25 calculates the temperature decrease gradient at the time of cooling based on the output of the temperature detecting means 4, and the water amount detecting means 26 detects the amount of water in the container 1. The pre-cooling time determining means 27 determines the pre-cooling time based on the value obtained by dividing the temperature decrease gradient by the amount of water.

How to determine the pre-cooling time will be described. First, if the amount of water in the container 1 is the same, the temperature decrease gradient at the time of cooling is proportional to the cooling efficiency of the cooling means 11 at that time, so that an appropriate preliminary cooling time can be determined from the temperature decrease gradient at the time of cooling. it can. Further, since the temperature drop gradient during cooling becomes steep in inverse proportion to the amount of water, it is clear that the influence of the amount of water can be eliminated by dividing by the amount of water.

As described above, according to the present embodiment, the preliminary cooling can be appropriately performed based on the value obtained by dividing the temperature drop gradient during cooling by the amount of water.

[0057]

According to the first aspect of the present invention, the liquid in the container is circulated through the first flow path connecting the lower part and the upper part of the container, and the liquid in the container is heated by the heating means. Therefore, even if the liquid is cooled by the cooling means after the liquid is heated and boiled, and the liquid is kept at a temperature lower than room temperature, the container is formed of a heat insulating material, so that no dew condensation occurs in the container. In addition, unlike the related art, the heating means is not directly attached to the container, and the heating means is provided in the first flow path. Therefore, only the container needs to be insulated without worrying about the heating means. It can have a structure and can be free of moisture absorption and dew condensation. In addition, since the container is thermally insulated even if cooling is continued for a long time, dew condensation occurs in the container, and the condensed water flows into the main unit, adversely affecting parts such as the motor inside the main unit, or It is possible to prevent the dew condensation water from leaking out and to wet the installation site with the dew condensation water. Also, Peltier element
Cooling efficiency is achieved by reducing the current flowing through the
Is low, so even if the operation is
Cooling is performed by performing intensive operation and intermittent operation.
Increasing rates.

According to the second means for solving the above problems, the circulating means is driven at predetermined time intervals to stir the liquid in the container and to suppress the occurrence of upper and lower temperature layers in the container. Average temperature can be accurately detected.

According to the third means for solving the above problems, the liquid in the heat exchange flow path is cooled to, for example, about 10 ° C. by the pre-cooling and then returned to the container, so that the water temperature of the container may increase unnecessarily. Absent.

According to the fourth means for solving the above problems, preliminary cooling is performed until the second temperature detecting means detects that the temperature of the liquid in the cooling means decreases to a predetermined temperature, and thereafter,
Since the liquid in the cooling means is returned to the container, the liquid in the cooling means can be returned when the temperature is accurately lowered.

According to the fifth means for solving the above problems, the pre-cooling time is determined by using the room temperature which is correlated with the liquid temperature in the cooling means, so that the room temperature detecting means which can be easily mounted can be used. In addition, the assembly workability can be improved.

According to the sixth means for solving the above problems, since the temperature of the radiation fin correlated with the room temperature is used,
Precooling control can be performed by using the third temperature detecting means for detecting the abnormal temperature of the radiation fin. Therefore, both the abnormal temperature detection of the radiation fin and the temperature detection for the pre-cooling control are performed by one.
This can be performed by one temperature detecting means, and the number of parts can be reduced.

[0063] According to the seventh means for solving problems, along with because it determines the pre-cooling time based on the value obtained by dividing the temperature drop gradient water, guessing the cooling efficiency of the cooling means from the temperature decrease gradient, inversely proportional to the amount of water By dividing the falling temperature gradient by the amount of water, the effect of the amount of water can be eliminated, and the precooling time can be accurately determined. In addition, the existing temperature detecting means can detect the temperature drop gradient, and the water amount detecting means is very commonly used for displaying the remaining amount of liquid in the pot. The pre-cooling time can be determined with a simple configuration using the temperature detecting means and the water amount detecting means.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pot showing a first embodiment of the present invention.

FIG. 2 is a block diagram of the main part.

FIG. 3 is a characteristic diagram of current versus heat absorption of the Peltier device.

FIG. 4 is a characteristic diagram of a temporal change in water temperature in a container that has been naturally left.

FIG. 5 is a characteristic diagram of water temperature in a container according to a second embodiment of the present invention.

FIG. 6 is a characteristic diagram of water temperature in a heat exchanger according to a third embodiment of the present invention.

FIG. 7 is a block diagram of a main part of a pot showing a fourth embodiment of the present invention.

FIG. 8 is a sectional view of the cooling means.

FIG. 9 is a block diagram of a main part of a pot showing a fifth embodiment of the present invention.

FIG. 10 is a correlation diagram of the pre-cooling time and water temperature.

FIG. 11 is a block diagram of a main part of a pot showing a sixth embodiment of the present invention.

FIG. 12 is a characteristic diagram of a heat-radiating surface temperature and a heat-absorbing surface temperature during the cooling operation.

FIG. 13 is a block diagram of a main part of a pot showing a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 3 Heat insulation material 4 Temperature detection means 6 1st flow path 7 2nd flow path 8 Electric pump (circulation means) 9 Switching valve 10 Boiler (heating means) 11 Cooling means 12 Heat exchange flow path (heat exchange container) Reference Signs List 13 Peltier element 14 Heat radiation fin (radiator) 20 Control means 21 Second temperature detecting means 24 Third temperature detecting means 25 Temperature gradient calculating means 26 Water amount detecting means 27 Pre-cooling time determining means

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Futa Hiromatsu 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-6-343550 (JP, A) JP-A-5 JP-A-39950 (JP, A) JP-A-6-117694 (JP, A) JP-A-57-54936 (JP, U) JP-A-58-39150 (JP, Y2) (58) Fields investigated (Int. . ^7, DB name) A47J 27/21 101 F24H 1/18 F25D 11/00 102

Claims (7)

(57) [Claims] 1. A container for accommodating a liquid, a heat insulating material for insulating the container, temperature detecting means for detecting a temperature of the liquid in the container, and a first and a second unit for connecting a lower part and an upper part of the container 2 channel, and a part of the first channel and the second channel
A switching valve connected to the shared flow path, a heating means provided in the first flow path, a cooling means comprising a Peltier element provided in the second flow path, A circulating means for circulating the liquid in the container provided in the shared portion of the second flow path ; heating and boiling the liquid in the container by the heating means; The cooling means so that the detected temperature becomes a predetermined temperature.
A pot having control means for intermittently driving a circulation means as needed to keep cool. 2. The pot according to claim 1, wherein the control means drives the circulation means at predetermined time intervals to stir the liquid in the container, and then detects the temperature of the liquid with the temperature detection means. Wherein when cold liquids, pot according to claim 1, further comprising a precooling function to operate the circulating means a cooling means after driving for a predetermined time. 4. A second method for detecting the temperature of the liquid in the cooling means.
4. The pot according to claim 3 , further comprising: a pre-cooling device based on a temperature detected by the second temperature detecting device. 4. 5. The pot according to claim 3 , wherein the pre-cooling time is determined based on the room temperature. 6. a third temperature detection means provided in the radiator which constitutes the cooling means, the third claim 3 pots according to pre-cooled on the basis of the detected temperature of the temperature detection means. 7. A water amount detecting means for detecting a water amount of the liquid in the container, a temperature gradient calculating means for inputting a temperature detected by the temperature detecting means and calculating a temperature decreasing gradient at the time of cooling, and a temperature decreasing gradient by a water amount. 4. The pot according to claim 3 , further comprising a pre-cooling time determining means for determining a pre-cooling time based on the divided value.